/* roulang page: index */
:root {
    --primary: #2B7AB9;
    --primary-dark: #1B5A8A;
    --primary-light: #E8F2FA;
    --accent: #E8873B;
    --green: #2E9E6B;
    --bg-page: #F7FAFD;
    --bg-white: #FFFFFF;
    --bg-alt: #EFF4F9;
    --text-main: #1B2633;
    --text-secondary: #4A5A6A;
    --text-muted: #8494A6;
    --border: #DDE6EF;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 2px 12px rgba(27, 90, 138, 0.08);
    --shadow-hover: 0 8px 24px rgba(27, 90, 138, 0.14);
    --spacer: clamp(48px, 7vw, 96px);
}
* {
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    color: var(--text-main);
    background: var(--bg-page);
    overflow-x: hidden;
}
h1,
h2,
h3,
h4,
h5,
h6 {
    margin: 0;
    font-weight: 700;
    line-height: 1.35;
    color: var(--text-main);
}
p {
    margin: 0;
}
a {
    color: var(--primary);
    text-decoration: none;
    transition: color .25s ease;
}
a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}
button,
input,
select,
textarea {
    font-family: inherit;
}
.section-padding {
    padding-top: var(--spacer);
    padding-bottom: var(--spacer);
}
.bg-white {
    background: var(--bg-white);
}
.bg-light {
    background: var(--bg-alt);
}
.bg-blue-light {
    background: var(--primary-light);
}
.badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    line-height: 1.5;
}
.badge-primary {
    background: var(--primary-light);
    color: var(--primary);
}
.section-head {
    max-width: 640px;
    margin-bottom: 50px;
}
.section-head h2 {
    font-size: clamp(24px, 2.5vw, 34px);
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}
.section-head p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.75;
}
.section-head .more-link {
    margin-left: auto;
    font-size: 14px;
    color: var(--primary);
    white-space: nowrap;
}
.section-head .more-link i {
    transition: transform .25s ease;
}
.section-head .more-link:hover i {
    transform: translateX(4px);
}
.section-head-row {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 40px;
}
.section-head-row .section-head {
    margin-bottom: 0;
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    line-height: 1.5;
    border: 1px solid transparent;
    transition: all .3s ease;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}
.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}
.btn-primary:active {
    background: var(--primary-dark);
    transform: translateY(0);
    filter: brightness(0.95);
}
.btn-outline {
    background: var(--bg-white);
    color: var(--primary);
    border-color: var(--primary);
}
.btn-outline:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.btn-outline:active {
    transform: translateY(0);
    background: var(--primary-light);
}
.btn-light-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.7);
}
.btn-light-outline:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    border-color: #fff;
    transform: translateY(-2px);
}
.btn-light-solid {
    background: #fff;
    color: var(--primary);
    border-color: #fff;
}
.btn-light-solid:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}
.btn:focus-visible,
a:focus-visible,
button:focus-visible {
    outline: 3px solid rgba(43, 122, 185, 0.35);
    outline-offset: 2px;
}
/* ===== Top Bar ===== */
.topbar {
    background: #1B2A3D;
    color: #fff;
    font-size: 13px;
    line-height: 40px;
    position: relative;
    z-index: 1040;
}
.topbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    max-width: 1140px;
}
.topbar a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    transition: color .2s;
}
.topbar a:hover {
    color: #fff;
}
.topbar-center {
    flex: 1;
    text-align: center;
    color: rgba(255, 255, 255, 0.65);
    line-height: 40px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.topbar-center i {
    margin-right: 6px;
    opacity: .7;
}
.topbar-right a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    line-height: 40px;
    font-weight: 500;
}
.topbar-right i {
    font-size: 13px;
    opacity: .8;
}
/* ===== Navigation ===== */
.main-nav {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 8px rgba(27, 90, 138, 0.06);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1030;
    min-height: 68px;
}
.main-nav .container {
    max-width: 1140px;
    display: flex;
    align-items: center;
    min-height: 68px;
    position: relative;
}
.main-nav .navbar-brand {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 0;
    margin-right: 32px;
    line-height: 1.2;
    text-decoration: none;
}
.main-nav .brand-name {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.01em;
    line-height: 1.2;
}
.main-nav .brand-cn {
    color: var(--primary);
}
.main-nav .brand-domain {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: 0.02em;
    line-height: 1.2;
    margin-top: 1px;
}
.main-nav .navbar-nav {
    gap: 4px;
    margin-left: auto;
    align-items: center;
}
.main-nav .nav-link {
    color: var(--text-main);
    font-size: 15px;
    font-weight: 500;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    position: relative;
    transition: color .25s;
    white-space: nowrap;
}
.main-nav .nav-link:hover {
    color: var(--primary);
    text-decoration: none;
}
.main-nav .nav-link.active {
    color: var(--primary);
    font-weight: 600;
}
.main-nav .nav-link.active::after {
    content: '';
    position: absolute;
    left: 16px;
    right: 16px;
    bottom: -2px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}
.nav-cta {
    margin-left: 16px;
}
.main-nav .navbar-toggler {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    background: transparent;
    transition: box-shadow .2s;
}
.main-nav .navbar-toggler:focus {
    box-shadow: 0 0 0 3px rgba(43, 122, 185, 0.18);
    outline: none;
}
.main-nav .navbar-toggler-icon {
    background-image: url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath stroke='%232B7AB9' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 7h22M4 15h22M4 23h22'/%3E%3C/svg%3E");
    width: 22px;
    height: 22px;
}
/* ===== Hero ===== */
.hero {
    min-height: 60vh;
    background: linear-gradient(135deg, #F1F7FC 0%, #E8F2FA 55%, #F7FAFD 100%);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    padding: clamp(56px, 7vw, 96px) 0;
}
.hero::before {
    content: '';
    position: absolute;
    top: -80px;
    right: -60px;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    border: 60px solid rgba(43, 122, 185, 0.08);
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    bottom: -30px;
    left: 15%;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    border: 30px solid rgba(232, 135, 59, 0.06);
    pointer-events: none;
}
.hero .container {
    position: relative;
    z-index: 2;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 6px 18px;
    font-size: 13px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}
.hero-badge i {
    color: var(--green);
    font-size: 13px;
}
.hero h1 {
    font-size: clamp(30px, 4vw, 48px);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
    color: var(--text-main);
    margin-bottom: 18px;
    max-width: 560px;
}
.hero h1 .accent {
    color: var(--primary);
}
.hero-sub {
    font-size: 16px;
    line-height: 1.75;
    color: var(--text-secondary);
    max-width: 520px;
    margin-bottom: 32px;
}
.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 36px;
}
.hero-trust {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    margin: 0;
}
.hero-trust li {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}
.hero-trust li i {
    color: var(--green);
    font-size: 14px;
}
.hero-figure {
    position: relative;
}
.hero-figure img {
    width: 100%;
    border-radius: 16px;
    border: 1px solid var(--primary-light);
    box-shadow: var(--shadow-hover);
    object-fit: cover;
    aspect-ratio: 5/4;
}
/* ===== Features ===== */
.features {
    background: var(--bg-white);
}
.feature-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow);
    transition: box-shadow .3s ease, transform .3s ease, border-color .3s;
    height: 100%;
}
.feature-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
    border-color: rgba(43, 122, 185, 0.25);
}
.feature-icon {
    width: 72px;
    height: 72px;
    border-radius: 16px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    transition: background .3s;
}
.feature-icon i {
    font-size: 32px;
    color: var(--primary);
    transition: color .3s;
}
.feature-card:hover .feature-icon {
    background: var(--primary);
}
.feature-card:hover .feature-icon i {
    color: #fff;
}
.feature-card h3 {
    font-size: 19px;
    font-weight: 600;
    margin-bottom: 10px;
}
.feature-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.features-footnote {
    margin-top: 40px;
    text-align: center;
}
.features-footnote a {
    font-size: 14px;
    color: var(--primary);
    font-weight: 500;
}
/* ===== Showcase ===== */
.showcase {
    background: var(--bg-alt);
}
.showcase-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: box-shadow .3s ease;
    display: flex;
    flex-wrap: wrap;
}
.showcase-card:hover {
    box-shadow: var(--shadow-hover);
}
.showcase-img {
    flex: 0 0 50%;
    max-width: 50%;
    padding: 0;
    position: relative;
    overflow: hidden;
}
.showcase-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 16/10;
    display: block;
}
.showcase-body {
    flex: 0 0 50%;
    max-width: 50%;
    padding: 36px 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.showcase-body h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 14px;
}
.showcase-body p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.75;
    margin-bottom: 20px;
}
.showcase-list {
    list-style: none;
    padding: 0;
    margin: 0 0 24px;
}
.showcase-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 4px 0;
}
.showcase-list li i {
    color: var(--green);
    font-size: 14px;
    flex-shrink: 0;
}
.showcase-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap .25s ease;
}
.showcase-link:hover {
    gap: 10px;
    color: var(--primary-dark);
    text-decoration: none;
}
.showcase-card.reversed .showcase-img {
    order: 2;
}
.showcase-card.reversed .showcase-body {
    order: 1;
}
/* ===== Proof ===== */
.proof {
    background: var(--primary-light);
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    margin-bottom: 48px;
    border-bottom: 1px solid rgba(43, 122, 185, 0.15);
    padding-bottom: 48px;
}
.stat-item {
    text-align: center;
    border-left: 3px solid var(--primary);
    padding-left: 20px;
    text-align: left;
}
.stat-num {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 800;
    color: var(--accent);
    line-height: 1.2;
    font-family: "Inter", "Segoe UI", Roboto, sans-serif;
}
.stat-num small {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-secondary);
}
.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}
.proof-quote {
    position: relative;
    padding: 24px 28px;
    background: var(--bg-white);
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
    box-shadow: var(--shadow);
    margin-bottom: 32px;
}
.proof-quote p {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 8px;
}
.proof-quote cite {
    font-size: 13px;
    color: var(--text-muted);
    font-style: normal;
}
.proof-badges {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}
.proof-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid var(--primary);
    border-radius: 999px;
    padding: 6px 20px;
    font-size: 13px;
    color: var(--primary);
    background: var(--bg-white);
    font-weight: 500;
}
.proof-badge i {
    font-size: 13px;
    color: var(--green);
}
/* ===== Pricing ===== */
.pricing {
    background: var(--bg-white);
}
.pricing .section-head,
.pricing .section-head-row {
    margin-bottom: 40px;
}
.pricing-grid {
    display: flex;
    gap: 24px;
    justify-content: center;
    align-items: stretch;
    flex-wrap: wrap;
}
.price-card {
    flex: 1;
    max-width: 340px;
    min-width: 260px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 36px 28px;
    box-shadow: var(--shadow);
    position: relative;
    transition: box-shadow .3s ease, border-color .3s ease, transform .3s ease;
    display: flex;
    flex-direction: column;
}
.price-card:hover {
    box-shadow: var(--shadow-hover);
    border-color: rgba(43, 122, 185, 0.3);
}
.price-card.featured {
    border: 2px solid var(--primary);
    box-shadow: var(--shadow-hover);
    transform: scale(1.02);
    max-width: 360px;
    padding-top: 48px;
    z-index: 2;
}
.price-card.featured::before {
    content: '最受欢迎';
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 20px;
    border-radius: 999px;
    white-space: nowrap;
    box-shadow: 0 3px 10px rgba(232, 135, 59, 0.4);
}
.price-plan-name {
    font-size: 19px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 6px;
}
.price-plan-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}
.price-amount {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.2;
    margin-bottom: 6px;
    font-family: "Inter", "Segoe UI", Roboto, sans-serif;
}
.price-amount span {
    font-size: 15px;
    font-weight: 400;
    color: var(--text-muted);
    margin-left: 4px;
}
.price-period {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 28px;
}
.price-features {
    list-style: none;
    padding: 0;
    margin: 0 0 28px;
    flex: 1;
}
.price-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
    padding: 5px 0;
}
.price-features li i {
    color: var(--green);
    font-size: 14px;
    flex-shrink: 0;
}
.price-card .btn {
    width: 100%;
}
.pricing-note {
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 32px;
}
/* ===== News ===== */
.news {
    background: var(--bg-alt);
}
.news-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.news-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    display: flex;
    gap: 20px;
    align-items: center;
    transition: box-shadow .3s ease, border-color .3s ease;
}
.news-card:hover {
    box-shadow: var(--shadow-hover);
    border-color: rgba(43, 122, 185, 0.3);
}
.news-thumb {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--primary-light);
}
.news-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.news-body {
    flex: 1;
    min-width: 0;
}
.news-tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 12px;
    padding: 2px 10px;
    border-radius: 999px;
    margin-bottom: 6px;
    font-weight: 500;
}
.news-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    line-height: 1.5;
}
.news-title a {
    color: var(--text-main);
    text-decoration: none;
    transition: color .25s;
}
.news-title a:hover {
    color: var(--primary);
}
.news-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 6px;
}
.news-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-size: 13px;
    color: var(--text-muted);
}
.news-meta a {
    color: var(--primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    transition: gap .25s;
}
.news-meta a:hover {
    gap: 8px;
    color: var(--primary-dark);
    text-decoration: none;
}
.news-empty {
    border: 1px dashed var(--text-muted);
    border-radius: var(--radius);
    padding: 60px 20px;
    text-align: center;
    background: var(--bg-white);
    color: var(--text-muted);
    font-size: 14px;
}
.news-empty i {
    font-size: 32px;
    display: block;
    margin-bottom: 12px;
    color: var(--border);
}
/* ===== FAQ ===== */
.faq-section {
    background: var(--bg-white);
}
.faq-container {
    max-width: 840px;
    margin: 0 auto;
}
.accordion-item {
    border: 1px solid var(--border) !important;
    border-radius: 10px !important;
    margin-bottom: 14px;
    overflow: hidden;
    box-shadow: none !important;
    background: var(--bg-white);
}
.accordion-button {
    background: var(--bg-white);
    color: var(--text-main);
    font-size: 15px;
    font-weight: 600;
    padding: 18px 22px;
    box-shadow: none !important;
    transition: color .25s ease;
    display: flex;
    align-items: center;
}
.accordion-button::after {
    background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%232B7AB9'%3E%3Cpath fill-rule='evenodd' d='M8 2a.75.75 0 01.75.75v4.5h4.5a.75.75 0 010 1.5h-4.5v4.5a.75.75 0 01-1.5 0v-4.5h-4.5a.75.75 0 010-1.5h4.5v-4.5A.75.75 0 018 2z'/%3E%3C/svg%3E");
    transition: transform .3s ease;
    width: 16px;
    height: 16px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}
.accordion-button:not(.collapsed)::after {
    transform: rotate(45deg);
}
.accordion-button:not(.collapsed) {
    background: var(--primary-light);
    color: var(--primary);
}
.accordion-button:focus {
    box-shadow: 0 0 0 3px rgba(43, 122, 185, 0.15);
    outline: none;
    border-radius: 10px;
}
.accordion-body {
    padding: 18px 22px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.75;
    background: var(--bg-white);
}
.faq-more {
    text-align: center;
    margin-top: 28px;
    font-size: 14px;
    color: var(--text-secondary);
}
.faq-more a {
    color: var(--accent);
    font-weight: 600;
    margin-left: 6px;
}
.faq-more a:hover {
    text-decoration: none;
    color: var(--primary);
}
/* ===== Contact CTA ===== */
.contact-cta {
    background: var(--primary);
    border-radius: 20px;
    padding: clamp(48px, 5vw, 72px) 32px;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}
.contact-cta::before {
    content: '';
    position: absolute;
    top: -60px;
    right: -40px;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    border: 40px solid rgba(255, 255, 255, 0.08);
    pointer-events: none;
}
.contact-cta::after {
    content: '';
    position: absolute;
    bottom: -40px;
    left: -30px;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    border: 24px solid rgba(255, 255, 255, 0.08);
    pointer-events: none;
}
.contact-cta h2 {
    color: #fff;
    font-size: clamp(26px, 3vw, 34px);
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}
.contact-cta p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 15px;
    line-height: 1.7;
    max-width: 560px;
    margin: 0 auto 32px;
    position: relative;
    z-index: 1;
}
.contact-cta .btn {
    position: relative;
    z-index: 1;
    margin: 0 6px;
}
.contact-meta {
    margin-top: 28px;
    display: flex;
    justify-content: center;
    gap: 28px;
    flex-wrap: wrap;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.7);
    position: relative;
    z-index: 1;
}
.contact-meta span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.contact-meta i {
    opacity: .8;
}
/* ===== Footer ===== */
.footer {
    background: #132130;
    color: rgba(255, 255, 255, 0.65);
    padding-top: clamp(48px, 5vw, 72px);
    margin-top: 0;
    padding-bottom: 32px;
}
.footer .container {
    max-width: 1140px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-brand {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    display: block;
    margin-bottom: 10px;
    text-decoration: none;
}
.footer-brand .brand-cn {
    color: var(--accent);
}
.footer-desc {
    font-size: 13px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.5);
    max-width: 280px;
}
.footer-title {
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 10px;
}
.footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 28px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-links li {
    padding: 4px 0;
}
.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    text-decoration: none;
    transition: color .25s, padding-left .25s;
}
.footer-links a:hover {
    color: #fff;
    padding-left: 4px;
    text-decoration: none;
}
.footer-contact {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-contact li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    padding: 4px 0;
}
.footer-contact li i {
    width: 18px;
    text-align: center;
    color: var(--accent);
    font-size: 13px;
}
.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 24px;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
}
.footer-bottom a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
}
.footer-bottom a:hover {
    color: #fff;
}
/* ===== Float CTA ===== */
.float-cta {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1050;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--accent);
    color: #fff;
    border-radius: 999px;
    width: 136px;
    height: 48px;
    font-size: 15px;
    font-weight: 600;
    box-shadow: 0 6px 20px rgba(232, 135, 59, 0.45);
    text-decoration: none;
    transition: transform .3s ease, box-shadow .3s ease, background .3s ease, opacity .3s ease;
    opacity: 0;
    transform: translateY(16px);
    pointer-events: none;
}
.float-cta.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
.float-cta:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(43, 122, 185, 0.35);
    text-decoration: none;
}
.float-cta.back-to-top {
    background: var(--primary);
    box-shadow: 0 6px 20px rgba(43, 122, 185, 0.35);
}
.float-cta.back-to-top i {
    font-size: 14px;
}
/* ===== Responsive ===== */
@media (max-width: 1199.98px) {
    .container {
        max-width: 960px;
    }
    .feature-card {
        padding: 20px;
    }
    .showcase-body {
        padding: 28px 24px;
    }
}
@media (max-width: 991.98px) {
    .topbar-center {
        display: none;
    }
    .main-nav .container {
        flex-wrap: wrap;
    }
    .main-nav .navbar-collapse {
        background: var(--bg-white);
        border-top: 1px solid var(--border);
        padding: 16px 0 20px;
    }
    .main-nav .navbar-nav {
        gap: 0;
        width: 100%;
    }
    .main-nav .nav-link {
        padding: 12px 16px;
        border-bottom: 1px solid #f0f3f7;
        font-size: 15px;
    }
    .main-nav .nav-link.active {
        background: var(--primary-light);
        color: var(--primary);
        border-radius: var(--radius-sm);
    }
    .main-nav .nav-link.active::after {
        display: none;
    }
    .nav-cta {
        margin-left: 0;
        margin-top: 14px;
        width: 100%;
        justify-content: center;
    }
    .hero {
        padding: 48px 0;
    }
    .hero-figure {
        margin-top: 40px;
    }
    .hero-figure img {
        aspect-ratio: 16/10;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    .pricing-grid {
        flex-direction: column;
        align-items: center;
    }
    .price-card,
    .price-card.featured {
        max-width: 400px;
        width: 100%;
        transform: none;
    }
    .price-card.featured {
        order: -1;
    }
    .showcase-card {
        flex-wrap: wrap;
    }
    .showcase-img,
    .showcase-body {
        flex: 0 0 100%;
        max-width: 100%;
    }
    .showcase-card.reversed .showcase-img {
        order: 1;
    }
    .showcase-card.reversed .showcase-body {
        order: 2;
    }
    .showcase-img img {
        aspect-ratio: 16/9;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}
@media (max-width: 767.98px) {
    .topbar-right {
        font-size: 12px;
    }
    .topbar-left .brand-short {
        font-size: 12px;
    }
    .topbar-center {
        display: none;
    }
    .main-nav {
        min-height: 60px;
    }
    .main-nav .container {
        min-height: 60px;
    }
    .main-nav .brand-name {
        font-size: 20px;
    }
    .main-nav .brand-domain {
        font-size: 10px;
    }
    .hero h1 {
        font-size: 28px;
    }
    .hero-sub {
        font-size: 15px;
    }
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }
    .hero-actions .btn {
        width: 100%;
    }
    .hero-trust {
        gap: 12px;
    }
    .hero-trust li {
        font-size: 12px;
    }
    .section-padding {
        padding-top: 48px;
        padding-bottom: 48px;
    }
    .feature-card {
        margin-bottom: 16px;
    }
    .showcase-body {
        padding: 24px 20px;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .stat-item {
        border-left-width: 2px;
        padding-left: 12px;
    }
    .stat-num {
        font-size: 30px;
    }
    .news-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    .news-thumb {
        width: 100%;
        height: 140px;
    }
    .news-thumb img {
        height: 100%;
    }
    .proof-badges {
        flex-direction: column;
        align-items: center;
    }
    .proof-badge {
        width: 100%;
        max-width: 220px;
        justify-content: center;
    }
    .contact-cta {
        padding: 40px 20px;
    }
    .contact-cta .btn {
        width: 100%;
        max-width: 280px;
        margin-bottom: 10px;
    }
    .contact-meta {
        gap: 12px;
        flex-direction: column;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    .float-cta {
        width: 56px;
        height: 56px;
        border-radius: 50%;
        bottom: 16px;
        right: 16px;
        font-size: 13px;
        box-shadow: 0 6px 20px rgba(232, 135, 59, 0.5);
    }
    .float-cta .cta-icon {
        display: inline;
    }
    .float-cta .cta-text {
        display: inline;
    }
}
@media (max-width: 520px) {
    .topbar-left .brand-short {
        display: inline-block;
        max-width: 120px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    .hero h1 {
        font-size: 26px;
    }
    .hero-figure img {
        aspect-ratio: 4/3;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
    .stat-num {
        font-size: 26px;
    }
    .section-head-row {
        flex-direction: column;
        align-items: flex-start;
    }
    .section-head {
        margin-bottom: 30px;
    }
}

/* roulang page: article */
:root {
    --primary: #2B7AB9;
    --primary-dark: #1B5A8A;
    --primary-light: #E8F2FA;
    --accent: #E8873B;
    --green: #2E9E6B;
    --bg-page: #F7FAFD;
    --bg-card: #FFFFFF;
    --bg-alt: #EFF4F9;
    --text-main: #1B2633;
    --text-secondary: #4A5A6A;
    --text-muted: #8494A6;
    --border: #DDE6EF;
    --radius: 12px;
    --radius-lg: 16px;
    --shadow: 0 2px 12px rgba(27,90,138,0.08);
    --shadow-hover: 0 8px 24px rgba(27,90,138,0.14);
    --spacer: 16px;
    --container-max: 1140px;
    --transition: all .25s ease;
}

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    color: var(--text-main);
    background: var(--bg-page);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

p {
    margin-top: 0;
    margin-bottom: 1rem;
}

h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    margin-bottom: .5rem;
    line-height: 1.35;
    font-weight: 700;
    color: var(--text-main);
}

/* ===== 容器 ===== */
.container {
    max-width: var(--container-max);
    padding-left: 20px;
    padding-right: 20px;
}

.article-container {
    max-width: 860px;
}

/* ===== 顶部信息条 ===== */
.top-info-bar {
    background: #1B2A3D;
    color: rgba(255,255,255,.85);
    font-size: 13px;
    padding: 8px 0;
    min-height: 38px;
}

.top-info-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.top-info-bar a {
    color: rgba(255,255,255,.9);
}

.top-info-bar a:hover {
    color: #fff;
    text-decoration: none;
}

.top-info-left {
    font-weight: 600;
}

.top-info-center {
    color: rgba(255,255,255,.7);
}

.top-info-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.top-info-right .fa-phone, .top-info-right .fa-envelope {
    margin-right: 4px;
    color: var(--accent);
}

/* ===== 主导航 ===== */
.main-nav {
    background: #FFFFFF;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 8px rgba(27,90,138,.06);
    position: sticky;
    top: 0;
    z-index: 1030;
    padding: 0;
    min-height: 68px;
}

.main-nav .container {
    display: flex;
    align-items: center;
    gap: 20px;
    min-height: 68px;
}

.navbar-brand {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 0;
    margin-right: 24px;
    line-height: 1.2;
}

.brand-name {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.brand-name .brand-cn {
    color: var(--primary);
}

.brand-domain {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: .3px;
    line-height: 1.4;
}

.main-nav .navbar-nav {
    gap: 4px;
    align-items: center;
}

.main-nav .nav-link {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 14px !important;
    border-radius: 6px;
    position: relative;
    transition: var(--transition);
}

.main-nav .nav-link::after {
    content: "";
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 2px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
    opacity: 0;
    transform: scaleX(.4);
    transition: var(--transition);
}

.main-nav .nav-link:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.main-nav .nav-link:hover::after {
    opacity: 1;
    transform: scaleX(1);
}

.main-nav .nav-link.active {
    color: var(--primary);
    font-weight: 600;
}

.main-nav .nav-link.active::after {
    opacity: 1;
    transform: scaleX(1);
}

.nav-cta {
    margin-left: 12px;
    white-space: nowrap;
}

.main-nav .navbar-toggler {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 6px 10px;
    color: var(--primary);
}

.main-nav .navbar-toggler:focus {
    box-shadow: 0 0 0 3px rgba(43,122,185,.15);
}

.main-nav .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%232B7AB9' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    width: 22px;
    height: 22px;
}

/* ===== 按钮 ===== */
.btn {
    border-radius: 8px;
    font-weight: 600;
    padding: 10px 24px;
    font-size: 15px;
    transition: var(--transition);
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(27,90,138,.25);
}

.btn-primary:active {
    background: #154a72;
    transform: translateY(0);
}

.btn-outline-primary {
    background: #fff;
    border-color: var(--primary);
    color: var(--primary);
}

.btn-outline-primary:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-outline-light {
    background: transparent;
    border-color: rgba(255,255,255,.7);
    color: #fff;
}

.btn-outline-light:hover {
    background: rgba(255,255,255,.15);
    border-color: #fff;
    color: #fff;
}

.btn-accent {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    border-radius: 999px;
    padding: 12px 28px;
    font-weight: 600;
}

.btn-accent:hover {
    background: #d6742f;
    border-color: #d6742f;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(232,135,59,.3);
}

/* ===== 面包屑 ===== */
.breadcrumb-section {
    background: var(--bg-page);
    padding: 24px 0 0;
}

.breadcrumb {
    margin-bottom: 0;
    font-size: 14px;
}

.breadcrumb-item a {
    color: var(--text-muted);
    text-decoration: none;
}

.breadcrumb-item a:hover {
    color: var(--primary);
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: var(--primary);
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "/";
    color: var(--text-muted);
    padding: 0 6px;
}

/* ===== 文章页主体 ===== */
.article-main {
    padding: 32px 0 64px;
}

.article-card {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 48px 48px 32px;
    margin-bottom: 32px;
}

.article-header {
    margin-bottom: 32px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 28px;
}

.article-title {
    font-size: clamp(24px, 3vw, 36px);
    font-weight: 700;
    line-height: 1.35;
    color: var(--text-main);
    margin-bottom: 20px;
    letter-spacing: -.3px;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px 28px;
    align-items: center;
    font-size: 13px;
    color: var(--text-muted);
}

.article-meta .meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.article-meta .meta-item svg,
.article-meta .meta-item i {
    width: 16px;
    height: 16px;
    color: var(--primary);
    opacity: .7;
    font-size: 14px;
}

.article-meta .meta-item .meta-icon {
    stroke: var(--primary);
    stroke-width: 1.5;
    fill: none;
}

.article-meta .meta-category {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 2px 10px;
    border-radius: 999px;
    font-weight: 500;
    font-size: 12px;
}

/* ===== 正文样式 ===== */
.article-body {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.article-body > *:last-child {
    margin-bottom: 0;
}

.article-body h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-main);
    margin: 2em 0 .75em;
    padding-left: 14px;
    border-left: 4px solid var(--primary);
    border-radius: 0 4px 4px 0;
}

.article-body h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-main);
    margin: 1.8em 0 .6em;
}

.article-body p {
    margin-bottom: 1.5em;
}

.article-body ul,
.article-body ol {
    margin: 1em 0 1.5em;
    padding-left: 1.5em;
}

.article-body li {
    margin-bottom: .5em;
}

.article-body img {
    border-radius: var(--radius);
    margin: 1.5em 0;
    box-shadow: var(--shadow);
    max-width: 100%;
    height: auto;
}

.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5em 0;
    font-size: 15px;
}

.article-body th {
    background: var(--primary-light);
    color: var(--text-main);
    font-weight: 600;
    padding: 12px 16px;
    text-align: left;
    border: 1px solid var(--border);
}

.article-body td {
    padding: 10px 16px;
    border: 1px solid var(--border);
    vertical-align: top;
}

.article-body blockquote {
    border-left: 4px solid var(--primary);
    background: var(--primary-light);
    padding: 16px 20px;
    border-radius: 0 8px 8px 0;
    margin: 1.5em 0;
    color: var(--text-secondary);
    font-style: italic;
}

.article-body a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.article-body a:hover {
    color: var(--primary-dark);
}

/* ===== 标签区 ===== */
.article-tags {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.article-tags .tag-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-right: 4px;
}

.article-tags .tag-chip {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 500;
    padding: 4px 14px;
    border-radius: 999px;
    transition: var(--transition);
}

.article-tags .tag-chip:hover {
    background: var(--primary);
    color: #fff;
    text-decoration: none;
}

/* ===== 未找到 ===== */
.article-not-found {
    text-align: center;
    padding: 64px 24px;
}

.article-not-found .nf-icon {
    font-size: 48px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.article-not-found p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ===== 相关推荐 ===== */
.related-section {
    padding: 16px 0 40px;
}

.related-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-main);
    position: relative;
    padding-left: 14px;
}

.related-title::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 22px;
    background: var(--primary);
    border-radius: 4px;
}

.related-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.related-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.related-card:hover {
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
    transform: translateY(-4px);
}

.related-card-img {
    width: 100%;
    height: 170px;
    object-fit: cover;
    display: block;
    background: var(--primary-light);
}

.related-card-body {
    padding: 20px 22px 18px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.related-card-time {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.related-card-time i {
    font-size: 12px;
    color: var(--primary);
}

.related-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.45;
}

.related-card h3 a {
    color: var(--text-main);
    text-decoration: none;
}

.related-card h3 a:hover {
    color: var(--primary);
}

.related-card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.related-card-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.related-card-link:hover {
    color: var(--primary-dark);
    text-decoration: none;
    gap: 10px;
}

.related-card-link i {
    font-size: 13px;
    transition: var(--transition);
}

/* ===== 返回入口 ===== */
.article-back {
    margin-top: 24px;
}

.btn-back {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    border-radius: 8px;
    padding: 8px 20px;
    font-size: 14px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    text-decoration: none;
}

.btn-back:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    text-decoration: none;
    transform: translateX(-4px);
}

/* ===== 文章CTA ===== */
.article-cta {
    background: var(--primary);
    border-radius: var(--radius-lg);
    padding: 48px 32px;
    text-align: center;
    margin: 40px 0 0;
    position: relative;
    overflow: hidden;
}

.article-cta::before {
    content: "";
    position: absolute;
    top: -40px;
    right: -40px;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: rgba(255,255,255,.08);
}

.article-cta::after {
    content: "";
    position: absolute;
    bottom: -60px;
    left: -20px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(255,255,255,.05);
}

.article-cta h2 {
    color: #fff;
    font-size: clamp(22px, 2.5vw, 30px);
    font-weight: 700;
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
}

.article-cta p {
    color: rgba(255,255,255,.85);
    font-size: 15px;
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}

.article-cta .btn-white {
    background: #fff;
    color: var(--primary);
    border-radius: 999px;
    padding: 12px 32px;
    font-weight: 600;
    border: none;
    margin: 0 8px;
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

.article-cta .btn-white:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,.15);
}

.article-cta .btn-ghost {
    background: transparent;
    color: #fff;
    border: 1px solid rgba(255,255,255,.7);
    border-radius: 999px;
    padding: 12px 32px;
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    z-index: 1;
    margin: 0 8px;
}

.article-cta .btn-ghost:hover {
    background: rgba(255,255,255,.15);
    color: #fff;
    border-color: #fff;
}

.article-cta .cta-contact {
    margin-top: 20px;
    font-size: 13px;
    color: rgba(255,255,255,.7);
    position: relative;
    z-index: 1;
}

.article-cta .cta-contact i {
    margin: 0 4px;
}

/* ===== 页脚 ===== */
.footer {
    background: #132130;
    color: rgba(255,255,255,.75);
    padding: 64px 0 0;
    margin-top: 64px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-brand {
    font-size: 22px;
    font-weight: 800;
    color: #fff;
    text-decoration: none;
    line-height: 1.3;
    display: inline-block;
    margin-bottom: 12px;
}

.footer-brand .brand-cn {
    color: #6db3e8;
}

.footer-brand:hover {
    color: #fff;
    text-decoration: none;
}

.footer-desc {
    font-size: 13px;
    line-height: 1.7;
    color: rgba(255,255,255,.6);
    margin-bottom: 0;
    max-width: 280px;
}

.footer-title {
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
    letter-spacing: .5px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255,255,255,.6);
    font-size: 13px;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: #fff;
    padding-left: 4px;
}

.footer-contact {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-contact li {
    font-size: 13px;
    color: rgba(255,255,255,.6);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-contact li i {
    color: var(--accent);
    width: 16px;
    font-size: 14px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.1);
    padding: 20px 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: rgba(255,255,255,.45);
}

.footer-bottom a {
    color: rgba(255,255,255,.55);
}

.footer-bottom a:hover {
    color: #fff;
}

/* ===== 浮动CTA ===== */
.float-cta {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 1050;
    display: none;
}

.float-cta.show {
    display: block;
}

.float-cta a.btn-accent {
    width: 136px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 15px;
    box-shadow: 0 8px 24px rgba(232,135,59,.35);
}

/* ===== 响应式 ===== */
@media (max-width: 991.98px) {
    .main-nav .navbar-collapse {
        background: #fff;
        border-top: 1px solid var(--border);
        padding: 16px 0;
        margin-top: 8px;
    }

    .main-nav .navbar-nav {
        align-items: stretch;
        gap: 0;
        margin-bottom: 12px;
    }

    .main-nav .nav-link {
        padding: 12px 16px !important;
        border-radius: 8px;
    }

    .main-nav .nav-link::after {
        display: none;
    }

    .main-nav .nav-link.active {
        background: var(--primary-light);
    }

    .nav-cta {
        margin-left: 0;
        display: block;
        text-align: center;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .related-grid {
        grid-template-columns: 1fr;
    }

    .article-card {
        padding: 32px 24px 24px;
    }

    .top-info-center {
        display: none;
    }
}

@media (max-width: 767.98px) {
    .article-cta {
        padding: 40px 20px;
    }

    .article-cta .btn-white,
    .article-cta .btn-ghost {
        margin: 8px 0;
        display: block;
        width: 100%;
        max-width: 260px;
        margin-left: auto;
        margin-right: auto;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .related-card-img {
        height: 150px;
    }

    .float-cta {
        right: 16px;
        bottom: 16px;
    }

    .float-cta a.btn-accent {
        width: 56px;
        height: 56px;
        border-radius: 50%;
        font-size: 13px;
        flex-direction: column;
        gap: 0;
        padding: 0;
    }

    .float-cta a.btn-accent span {
        display: block;
        font-size: 10px;
        margin-top: 2px;
    }

    .article-meta {
        gap: 12px 16px;
    }
}

@media (max-width: 575.98px) {
    .top-info-left {
        font-size: 12px;
    }

    .top-info-right {
        gap: 8px;
    }

    .brand-name {
        font-size: 20px;
    }

    .brand-domain {
        font-size: 10px;
    }

    .article-title {
        font-size: 22px;
    }

    .article-body {
        font-size: 15px;
    }

    .article-body h2 {
        font-size: 20px;
    }

    .article-body h3 {
        font-size: 17px;
    }

    .related-grid {
        grid-template-columns: 1fr;
    }
}

/* roulang page: category1 */
:root {
            --brand: #2B7AB9;
            --brand-dark: #1B5A8A;
            --brand-light: #E8F2FA;
            --accent: #E8873B;
            --green: #2E9E6B;
            --bg-page: #F7FAFD;
            --bg-white: #FFFFFF;
            --bg-alt: #EFF4F9;
            --text-main: #1B2633;
            --text-secondary: #4A5A6A;
            --text-muted: #8494A6;
            --border: #DDE6EF;
            --radius: 12px;
            --radius-btn: 8px;
            --shadow-sm: 0 2px 12px rgba(27, 90, 138, 0.08);
            --shadow-md: 0 8px 24px rgba(27, 90, 138, 0.14);
            --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            background: var(--bg-page);
            color: var(--text-main);
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: var(--brand);
            transition: color .2s ease;
        }
        a:hover {
            color: var(--brand-dark);
        }

        img {
            max-width: 100%;
            display: block;
        }

        ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .container {
            max-width: 1140px;
        }

        /* 顶部信息条 */
        .topbar {
            background: #1B2A3D;
            color: rgba(255, 255, 255, 0.9);
            font-size: 13px;
            padding: 8px 0;
        }
        .topbar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .topbar a {
            color: rgba(255, 255, 255, 0.88);
            font-weight: 400;
        }
        .topbar a:hover {
            color: #fff;
        }
        .topbar-center {
            color: rgba(255, 255, 255, 0.75);
        }
        .topbar-right i {
            margin-right: 4px;
            color: var(--accent);
        }

        /* 主导航 */
        .main-nav {
            background: #fff;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 8px rgba(27, 90, 138, 0.06);
            min-height: 72px;
            padding: 10px 0;
            position: sticky;
            top: 0;
            z-index: 1030;
        }
        .navbar-brand {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            line-height: 1.2;
            padding: 0;
            margin-right: 24px;
        }
        .brand-name {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: -0.3px;
        }
        .brand-cn {
            color: var(--accent);
            font-weight: 700;
        }
        .brand-domain {
            font-size: 11px;
            color: var(--text-muted);
            letter-spacing: 0.3px;
        }
        .main-nav .navbar-nav .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-main);
            padding: 10px 16px;
            margin: 0 2px;
            border-radius: 6px;
            position: relative;
            white-space: nowrap;
        }
        .main-nav .navbar-nav .nav-link:hover {
            color: var(--brand);
        }
        .main-nav .navbar-nav .nav-link.active {
            color: var(--brand);
            font-weight: 600;
        }
        .main-nav .navbar-nav .nav-link.active::after {
            content: '';
            position: absolute;
            left: 16px;
            right: 16px;
            bottom: 2px;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
        }
        .nav-cta {
            background: var(--brand);
            color: #fff;
            border: none;
            border-radius: var(--radius-btn);
            padding: 10px 22px;
            font-weight: 600;
            font-size: 14px;
            margin-left: 16px;
            transition: background .2s, transform .2s, box-shadow .2s;
        }
        .nav-cta:hover {
            background: var(--brand-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }
        .navbar-toggler {
            border: 1px solid var(--border);
            padding: 6px 10px;
            border-radius: 8px;
        }
        .navbar-toggler:focus {
            box-shadow: none;
            border-color: var(--brand);
        }
        .navbar-toggler-icon {
            filter: invert(35%) sepia(50%) saturate(500%) hue-rotate(175deg);
        }

        /* 页面 Banner */
        .page-banner {
            background: linear-gradient(180deg, #F1F7FC 0%, var(--brand-light) 100%);
            border-bottom: 1px solid var(--border);
            padding: clamp(40px, 5vw, 64px) 0 32px;
        }
        .page-banner h1 {
            font-size: clamp(26px, 3vw, 36px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .breadcrumb-wrap .breadcrumb {
            margin-bottom: 0;
            font-size: 14px;
        }
        .breadcrumb-wrap .breadcrumb-item a {
            color: var(--text-secondary);
        }
        .breadcrumb-wrap .breadcrumb-item a:hover {
            color: var(--brand);
        }
        .breadcrumb-wrap .breadcrumb-item.active {
            color: var(--text-muted);
        }
        .breadcrumb-item + .breadcrumb-item::before {
            color: var(--text-muted);
        }

        /* 分类说明 */
        .category-intro {
            background: #fff;
            padding: clamp(40px, 5vw, 64px) 0;
        }
        .category-intro .lead {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.9;
            max-width: 900px;
            margin: 0;
        }

        /* 内容网格 */
        .category-section {
            background: var(--bg-page);
            padding: clamp(40px, 5vw, 64px) 0;
        }
        .section-title {
            font-size: clamp(22px, 2.4vw, 30px);
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .section-subtitle {
            color: var(--text-secondary);
            font-size: 15px;
            margin-bottom: 32px;
        }
        .product-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            height: 100%;
            box-shadow: var(--shadow-sm);
            transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
            display: flex;
            flex-direction: column;
        }
        .product-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--brand-light);
        }
        .product-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform .3s ease;
        }
        .product-card:hover .card-img {
            transform: scale(1.03);
        }
        .product-card .card-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .product-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-main);
        }
        .product-card p {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 16px;
            flex: 1;
        }
        .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .card-link i {
            transition: transform .2s;
            font-size: 13px;
        }
        .card-link:hover {
            color: var(--brand-dark);
        }
        .card-link:hover i {
            transform: translateX(4px);
        }

        /* 服务保障带 */
        .guarantee-section {
            background: #fff;
            padding: 0 0 clamp(48px, 5vw, 72px);
        }
        .guarantee-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px;
            background: var(--bg-page);
        }
        .guarantee-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
        }
        .guarantee-item i {
            width: 44px;
            height: 44px;
            background: var(--brand-light);
            color: var(--brand);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 10px;
            font-size: 18px;
            flex-shrink: 0;
        }
        .guarantee-item h4 {
            font-size: 16px;
            font-weight: 600;
            margin: 0 0 4px;
            color: var(--text-main);
        }
        .guarantee-item p {
            font-size: 13px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.6;
        }

        /* 相关分类 */
        .related-section {
            background: var(--bg-page);
            padding: clamp(48px, 5vw, 72px) 0;
        }
        .related-card {
            display: block;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px;
            height: 100%;
            box-shadow: var(--shadow-sm);
            transition: box-shadow .25s, border-color .25s, transform .25s;
        }
        .related-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--brand);
            transform: translateY(-4px);
        }
        .related-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 8px;
        }
        .related-card p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 16px;
            line-height: 1.7;
        }
        .related-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--brand);
        }
        .related-link i {
            transition: transform .2s;
            font-size: 13px;
        }
        .related-card:hover .related-link i {
            transform: translateX(4px);
        }

        /* 页脚 */
        .footer {
            background: #132130;
            color: rgba(255, 255, 255, 0.75);
            font-size: 14px;
            padding-top: 56px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
        }
        .footer-brand {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
        }
        .footer-brand .brand-cn {
            color: var(--accent);
        }
        .footer-desc {
            color: rgba(255, 255, 255, 0.5);
            font-size: 13px;
            line-height: 1.7;
            margin: 12px 0 0;
            max-width: 260px;
        }
        .footer h4.footer-title {
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer-links li {
            margin-bottom: 8px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 13px;
            transition: color .2s;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-contact li {
            color: rgba(255, 255, 255, 0.55);
            font-size: 13px;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-contact i {
            color: var(--accent);
            width: 16px;
            text-align: center;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
            color: rgba(255, 255, 255, 0.4);
            font-size: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.55);
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* 响应式 */
        @media (max-width: 991.98px) {
            .topbar-center {
                display: none;
            }
            .main-nav .navbar-collapse {
                background: #fff;
                padding: 16px;
                border-radius: 12px;
                box-shadow: var(--shadow-md);
                margin-top: 12px;
                border: 1px solid var(--border);
            }
            .main-nav .navbar-nav .nav-link {
                padding: 12px 16px;
            }
            .main-nav .navbar-nav .nav-link.active::after {
                display: none;
            }
            .main-nav .navbar-nav .nav-link.active {
                background: var(--brand-light);
                border-radius: 6px;
            }
            .nav-cta {
                margin-left: 0;
                margin-top: 12px;
                display: inline-block;
                text-align: center;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .guarantee-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 767.98px) {
            .topbar-left {
                font-size: 12px;
            }
            .topbar-right a {
                font-size: 13px;
            }
            .topbar-right i {
                margin-right: 0;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .product-card .card-img {
                height: 180px;
            }
            .related-card {
                padding: 24px;
            }
            .guarantee-grid {
                padding: 24px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #2B7AB9;
            --primary-dark: #1B5A8A;
            --primary-light: #E8F2FA;
            --accent: #E8873B;
            --green: #2E9E6B;
            --bg-page: #F7FAFD;
            --bg-white: #FFFFFF;
            --bg-alt: #EFF4F9;
            --text-main: #1B2633;
            --text-sub: #4A5A6A;
            --text-weak: #8494A6;
            --border: #DDE6EF;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-pill: 999px;
            --shadow-sm: 0 2px 12px rgba(27, 90, 138, 0.08);
            --shadow-hover: 0 8px 24px rgba(27, 90, 138, 0.14);
            --transition: all 0.25s ease;
            --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-main);
            font-size: 15px;
            line-height: 1.7;
            color: var(--text-main);
            background: var(--bg-page);
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            max-width: 1160px;
            padding-left: 20px;
            padding-right: 20px;
        }

        .section {
            padding: clamp(48px, 7vw, 96px) 0;
            position: relative;
        }

        .section-alt {
            background: var(--bg-white);
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--primary-light);
            color: var(--primary-dark);
            font-size: 13px;
            font-weight: 600;
            padding: 5px 14px;
            border-radius: var(--radius-pill);
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }

        .section-title {
            font-size: clamp(24px, 2.5vw, 34px);
            font-weight: 700;
            line-height: 1.35;
            margin-bottom: 12px;
            color: var(--text-main);
        }

        .section-subtitle {
            font-size: 15px;
            color: var(--text-sub);
            max-width: 640px;
            line-height: 1.75;
        }

        /* ---------- 顶部信息条 ---------- */
        .topbar {
            background: #1B2A3D;
            color: #fff;
            font-size: 13px;
            line-height: 1;
            padding: 11px 0;
        }

        .topbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
        }

        .topbar-left {
            display: flex;
            align-items: center;
            gap: 18px;
        }

        .topbar-left .topbar-domain {
            color: rgba(255, 255, 255, 0.85);
            font-weight: 500;
        }

        .topbar-left .topbar-tip {
            color: rgba(255, 255, 255, 0.65);
        }

        .topbar-right span {
            color: rgba(255, 255, 255, 0.85);
            margin-left: 16px;
        }

        .topbar i {
            font-size: 12px;
            margin-right: 5px;
            color: var(--accent);
        }

        /* ---------- 主导航 ---------- */
        .main-nav {
            background: #fff;
            padding: 0;
            position: sticky;
            top: 0;
            z-index: 1030;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 8px rgba(27, 90, 138, 0.06);
            min-height: 72px;
        }

        .main-nav .navbar-brand {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            padding: 0;
            margin-right: 24px;
            line-height: 1.2;
        }

        .brand-name {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: -0.3px;
        }

        .brand-name .brand-cn {
            color: var(--primary);
            font-weight: 700;
            margin-left: 2px;
        }

        .brand-domain {
            font-size: 11px;
            color: var(--text-weak);
            font-weight: 400;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }

        .navbar-nav {
            gap: 6px;
            align-items: center;
        }

        .nav-item .nav-link {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-sub);
            padding: 8px 16px !important;
            border-radius: var(--radius-btn);
            position: relative;
            transition: var(--transition);
        }

        .nav-item .nav-link::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 16px;
            right: 16px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transform: scaleX(0);
            transition: transform 0.25s ease;
        }

        .nav-item .nav-link:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        .nav-item .nav-link.active {
            color: var(--primary);
            font-weight: 600;
            background: transparent;
        }

        .nav-item .nav-link.active::after {
            transform: scaleX(1);
        }

        .navbar-toggler {
            border: 1px solid var(--border);
            border-radius: var(--radius-btn);
            padding: 6px 10px;
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(43, 122, 185, 0.18);
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%231B2633' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        .nav-cta {
            margin-left: 16px;
            flex-shrink: 0;
        }

        /* ---------- 按钮 ---------- */
        .btn {
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 600;
            padding: 10px 24px;
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(43, 122, 185, 0.28);
            color: #fff;
        }

        .btn-primary:active {
            background: #154b76;
            transform: translateY(0);
            box-shadow: none;
        }

        .btn-outline-primary {
            background: transparent;
            color: var(--primary);
            border: 1px solid var(--primary);
        }

        .btn-outline-primary:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            border-color: var(--primary-dark);
        }

        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }

        .btn-accent:hover {
            background: #d6742d;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(232, 135, 59, 0.3);
        }

        .btn-light {
            background: #fff;
            color: var(--primary);
            border-color: #fff;
        }

        .btn-light:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255, 255, 255, 0.25);
        }

        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.7);
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border-color: #fff;
        }

        /* ---------- 页面 Banner ---------- */
        .page-banner {
            background: var(--primary-light);
            border-bottom: 1px solid var(--border);
            padding: clamp(36px, 5vw, 60px) 0 30px;
            position: relative;
            overflow: hidden;
        }

        .page-banner::before {
            content: '';
            position: absolute;
            top: -40px;
            right: -60px;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            border: 30px solid rgba(43, 122, 185, 0.08);
            pointer-events: none;
        }

        .page-banner .page-title {
            font-size: clamp(28px, 3.5vw, 38px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
            margin-bottom: 8px;
            position: relative;
        }

        .page-banner .page-title span {
            color: var(--primary);
        }

        .breadcrumb-item {
            font-size: 13px;
            color: var(--text-weak);
        }

        .breadcrumb-item a {
            color: var(--text-weak);
            transition: var(--transition);
        }

        .breadcrumb-item a:hover {
            color: var(--primary);
        }

        .breadcrumb-item.active {
            color: var(--text-sub);
        }

        .breadcrumb-item+.breadcrumb-item::before {
            content: '/';
            color: var(--border);
            padding: 0 6px;
        }

        /* ---------- 分类说明 ---------- */
        .category-intro {
            padding: clamp(32px, 4vw, 48px) 0 0;
        }

        .category-intro .intro-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: clamp(24px, 3vw, 36px);
            box-shadow: var(--shadow-sm);
        }

        .category-intro .intro-text {
            font-size: 15px;
            line-height: 1.8;
            color: var(--text-sub);
            margin-bottom: 0;
        }

        .intro-points {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            margin-top: 20px;
            padding-top: 18px;
            border-top: 1px solid var(--border);
        }

        .intro-points li {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-sub);
            font-weight: 500;
        }

        .intro-points li i {
            color: var(--green);
            font-size: 14px;
        }

        /* ---------- 服务网格卡片 ---------- */
        .service-grid {
            padding: clamp(48px, 6vw, 72px) 0 var(--grid-pad, 0);
        }

        .service-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .service-card:hover {
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-light);
            transform: translateY(-4px);
        }

        .service-card .card-img {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--primary-light);
        }

        .service-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .service-card:hover .card-img img {
            transform: scale(1.04);
        }

        .service-card .card-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .service-card .card-icon {
            width: 40px;
            height: 40px;
            background: var(--primary-light);
            border-radius: var(--radius-btn);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
            color: var(--primary);
            font-size: 18px;
        }

        .service-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .service-card p {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.7;
            margin-bottom: 16px;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .service-card .card-link {
            margin-top: auto;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .service-card .card-link:hover {
            color: var(--primary-dark);
            gap: 10px;
        }

        /* ---------- 流程 ---------- */
        .process-section {
            background: var(--bg-white);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .process-step {
            text-align: center;
            padding: 24px 20px;
            position: relative;
        }

        .process-step .step-num {
            width: 56px;
            height: 56px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 20px;
            font-weight: 800;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            border: 2px solid rgba(43, 122, 185, 0.12);
        }

        .process-step h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 8px;
        }

        .process-step p {
            font-size: 13px;
            color: var(--text-sub);
            line-height: 1.65;
            max-width: 220px;
            margin: 0 auto;
        }

        .process-step:not(:last-child)::after {
            content: '\f054';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 14px;
            color: var(--border);
            position: absolute;
            right: -14px;
            top: 44px;
        }

        /* ---------- FAQ ---------- */
        .faq-section {
            background: var(--bg-page);
        }

        .faq-wrap {
            max-width: 840px;
            margin: 0 auto;
        }

        .faq-wrap .accordion-item {
            border: 1px solid var(--border);
            border-radius: 10px !important;
            margin-bottom: 12px;
            overflow: hidden;
            background: var(--bg-white);
            box-shadow: none;
        }

        .faq-wrap .accordion-button {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-main);
            background: var(--bg-white);
            padding: 16px 20px;
            box-shadow: none;
            border: none;
        }

        .faq-wrap .accordion-button:not(.collapsed) {
            color: var(--primary);
            background: var(--primary-light);
        }

        .faq-wrap .accordion-button:focus {
            box-shadow: 0 0 0 3px rgba(43, 122, 185, 0.15);
            border-color: var(--primary-light);
        }

        .faq-wrap .accordion-button::after {
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            content: '\2b';
            background: none;
            width: 20px;
            height: 20px;
            font-size: 16px;
            color: var(--text-weak);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.25s ease;
        }

        .faq-wrap .accordion-button:not(.collapsed)::after {
            transform: rotate(45deg);
            color: var(--primary);
            background: none;
        }

        .faq-wrap .accordion-body {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.75;
            padding: 6px 20px 18px;
            background: var(--bg-white);
        }

        .faq-more {
            text-align: center;
            margin-top: 20px;
            font-size: 13px;
            color: var(--text-sub);
        }

        .faq-more a {
            color: var(--accent);
            font-weight: 600;
        }

        /* ---------- CTA 区 ---------- */
        .cta-section {
            background: var(--primary);
            border-radius: 20px;
            margin: clamp(24px, 4vw, 48px) 0;
            padding: clamp(40px, 5vw, 64px) 32px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            left: -60px;
            width: 220px;
            height: 220px;
            border-radius: 50%;
            border: 24px solid rgba(255, 255, 255, 0.06);
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            right: -40px;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            border: 20px solid rgba(255, 255, 255, 0.05);
        }

        .cta-section h2 {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 700;
            margin-bottom: 12px;
            position: relative;
        }

        .cta-section p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
            position: relative;
        }

        .cta-actions {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
            position: relative;
        }

        .cta-contact {
            margin-top: 20px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            position: relative;
        }

        .cta-contact span {
            margin: 0 14px;
        }

        /* ---------- 相关分类互链 ---------- */
        .related-section {
            padding: 0 0 clamp(48px, 6vw, 72px);
        }

        .related-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 28px;
            transition: var(--transition);
            display: block;
            height: 100%;
            box-shadow: var(--shadow-sm);
        }

        .related-card:hover {
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-light);
            transform: translateY(-4px);
            text-decoration: none;
        }

        .related-card .related-icon {
            width: 48px;
            height: 48px;
            background: var(--primary-light);
            border-radius: var(--radius-btn);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 20px;
            margin-bottom: 16px;
        }

        .related-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 8px;
        }

        .related-card p {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.7;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card .related-link {
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .related-card:hover .related-link {
            gap: 10px;
            color: var(--primary-dark);
        }

        /* ---------- 页脚 ---------- */
        .footer {
            background: #132130;
            color: rgba(255, 255, 255, 0.8);
            padding: 56px 0 0;
            margin-top: 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-brand {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            text-decoration: none;
        }

        .footer-brand .brand-cn {
            color: var(--primary);
        }

        .footer-desc {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.7;
            margin-top: 14px;
            max-width: 280px;
        }

        .footer-title {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.55);
            transition: var(--transition);
            text-decoration: none;
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.55);
            margin-bottom: 10px;
        }

        .footer-contact i {
            width: 20px;
            color: var(--primary);
            font-size: 13px;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
            padding: 22px 0;
            font-size: 12px;
            color: rgba(255, 255, 255, 0.4);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
            text-decoration: none;
        }

        .footer-bottom a:hover {
            color: #fff;
        }

        /* ---------- 响应式 ---------- */
        @media (max-width: 991px) {
            .main-nav {
                min-height: 64px;
            }

            .navbar-collapse {
                background: #fff;
                padding: 16px 0 20px;
                border-top: 1px solid var(--border);
                margin-top: 12px;
            }

            .navbar-nav {
                align-items: stretch;
                gap: 0;
                width: 100%;
            }

            .nav-item .nav-link {
                padding: 10px 16px !important;
                border-radius: var(--radius-btn);
            }

            .nav-item .nav-link::after {
                display: none;
            }

            .nav-cta {
                margin: 12px 0 0 16px;
                width: calc(100% - 32px);
                text-align: center;
            }

            .topbar-tip {
                display: none;
            }

            .process-step::after {
                display: none;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 767px) {
            .topbar-left .topbar-tip {
                display: none;
            }

            .topbar-right span {
                margin-left: 8px;
            }

            .section {
                padding: 40px 0;
            }

            .intro-points {
                gap: 10px;
                flex-direction: column;
                align-items: flex-start;
            }

            .service-card .card-body {
                padding: 20px;
            }

            .process-step {
                margin-bottom: 16px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }

            .page-banner {
                padding: 28px 0 22px;
            }
        }

        @media (max-width: 575px) {
            .container {
                padding-left: 14px;
                padding-right: 14px;
            }

            .topbar {
                font-size: 12px;
            }

            .topbar-left .topbar-domain {
                font-size: 12px;
            }

            .topbar-right {
                display: flex;
                align-items: center;
            }

            .topbar-right .topbar-phone-text {
                display: none;
            }

            .cta-section {
                padding: 36px 20px;
                border-radius: 16px;
            }

            .cta-actions .btn {
                width: 100%;
                max-width: 260px;
            }

            .service-card .card-img {
                aspect-ratio: 16 / 9;
            }
        }