/* roulang page: index */
:root {
    --bg-deep: #07090D;
    --bg-elev: #0E1117;
    --bg-card: #151A22;
    --bg-hover: #1C222C;
    --text-primary: #EEF2F5;
    --text-secondary: #9AA3AD;
    --text-weak: #5C646F;
    --accent-neon: #00E5A1;
    --accent-soft: #8A7CFF;
    --line-divider: rgba(255,255,255,0.06);
    --line-strong: rgba(255,255,255,0.12);
    --border-card: rgba(255,255,255,0.07);
    --shadow-card: 0 8px 28px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 20px rgba(0,229,161,0.25);
    --radius-btn: 6px;
    --radius-card: 12px;
    --radius-large: 20px;
    --container-max: 1280px;
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
button { font-family: inherit; }
ul, ol { list-style: none; }
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
}
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 48px;
}
.section-header h2 {
    font-size: clamp(1.5rem, 2.4vw, 2.1rem);
    font-weight: 800;
    line-height: 1.28;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}
.section-header h2::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--accent-neon);
    border-radius: 2px;
    display: inline-block;
    box-shadow: var(--shadow-glow);
}
.more-link {
    color: var(--text-secondary);
    font-size: 14px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color 0.3s var(--ease);
}
.more-link:hover { color: var(--accent-neon); }
.more-link::after { content: '→'; transition: transform 0.3s var(--ease); }
.more-link:hover::after { transform: translateX(3px); }

/* ===== Header / Nav ===== */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    height: 72px;
    background: rgba(7,9,13,0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line-divider);
    transition: background 0.4s var(--ease);
}
.site-header.scrolled {
    background: rgba(7,9,13,0.98);
}
.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    height: 100%;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    gap: 4px;
}
.brand-text {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    color: var(--text-primary);
    line-height: 1.2;
}
.brand-line {
    width: 36px;
    height: 2px;
    background: var(--accent-neon);
    box-shadow: var(--shadow-glow);
    border-radius: 2px;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
}
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    padding: 8px 0;
    position: relative;
    transition: color 0.3s var(--ease);
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 100%; height: 2px;
    background: var(--accent-neon);
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--ease);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--text-primary); }
.nav-links a.active::after {
    transform: scaleX(1);
    box-shadow: var(--shadow-glow);
}
.nav-cta {
    background: var(--accent-neon);
    color: var(--bg-deep);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 12px 24px;
    border-radius: var(--radius-btn);
    border: 1px solid transparent;
    transition: all 0.4s var(--ease);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.nav-cta:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
    background: #00f5b0;
}
.menu-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-btn);
    width: 42px; height: 42px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    flex-direction: column;
    gap: 5px;
}
.menu-toggle span {
    display: block;
    width: 20px; height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.3s var(--ease), opacity 0.3s;
}
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(rgba(7,9,13,0.7), rgba(7,9,13,0.2), rgba(7,9,13,0.95)), url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
    padding: 140px 0 100px;
    overflow: hidden;
}
.hero-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    gap: 60px;
    width: 100%;
}
.hero-content {
    flex: 0 0 60%;
    max-width: 60%;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.03em;
    color: var(--accent-neon);
    border: 1px solid rgba(0,229,161,0.3);
    padding: 6px 16px;
    border-radius: 30px;
    margin-bottom: 28px;
}
.hero-badge::before {
    content: '';
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent-neon);
    box-shadow: 0 0 10px rgba(0,229,161,0.7);
}
.hero-title {
    font-size: clamp(2.6rem, 5.5vw, 4.2rem);
    font-weight: 800;
    line-height: 1.16;
    letter-spacing: 0.01em;
    margin-bottom: 32px;
    color: var(--text-primary);
}
.hero-sub {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 560px;
}
.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.btn-primary {
    background: var(--accent-neon);
    color: var(--bg-deep);
    font-weight: 600;
    padding: 14px 32px;
    border-radius: var(--radius-btn);
    text-decoration: none;
    font-size: 1rem;
    border: 1px solid transparent;
    transition: all 0.4s var(--ease);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.btn-primary:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
    background: #00f5b0;
}
.btn-secondary {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--text-primary);
    padding: 14px 32px;
    border-radius: var(--radius-btn);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.4s var(--ease);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-secondary:hover {
    border-color: var(--accent-neon);
    color: var(--accent-neon);
}
.hero-decor {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}
.hero-decor-line {
    width: 1px;
    height: 240px;
    background: linear-gradient(to bottom, transparent, var(--accent-neon), transparent);
    box-shadow: var(--shadow-glow);
}
.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px; height: 36px;
    border: 1px solid var(--line-strong);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    animation: scrollPulse 1.6s ease-in-out infinite;
    cursor: pointer;
    text-decoration: none;
}
@keyframes scrollPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.35; }
}

/* ===== Services ===== */
.services-section {
    padding: 96px 0;
    background: var(--bg-deep);
}
.services-list {
    max-width: 1000px;
    margin: 0 auto;
}
.service-item {
    display: flex;
    align-items: center;
    gap: 28px;
    padding: 0 24px;
    height: 96px;
    border-bottom: 1px solid var(--line-divider);
    position: relative;
    cursor: default;
    transition: background 0.4s var(--ease);
}
.service-item:first-child {
    border-top: 1px solid var(--line-divider);
}
.service-item::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 4px;
    background: var(--accent-neon);
    box-shadow: var(--shadow-glow);
    opacity: 0;
    transition: opacity 0.4s var(--ease);
}
.service-item:hover {
    background: var(--bg-elev);
}
.service-item:hover::before {
    opacity: 1;
}
.service-number {
    font-family: "DIN Alternate", "Barlow Condensed", "Roboto Mono", monospace;
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--accent-neon);
    width: 100px;
    flex-shrink: 0;
}
.service-icon {
    width: 24px; height: 24px;
    flex-shrink: 0;
    color: var(--text-secondary);
}
.service-info {
    flex: 1;
    min-width: 0;
}
.service-info h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}
.service-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}
.service-arrow {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    transition: all 0.4s var(--ease);
}
.service-arrow:hover {
    color: var(--accent-neon);
    transform: translateX(4px);
}

/* ===== Stats ===== */
.stats-section {
    padding: 96px 0;
    background: var(--bg-elev);
    position: relative;
    overflow: hidden;
}
.stats-section::before {
    content: '';
    position: absolute;
    top: -200px; left: -100px;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(0,229,161,0.08), transparent 70%);
    pointer-events: none;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    position: relative;
}
.stat-item {
    text-align: center;
    padding: 24px 16px;
    border-left: 1px solid var(--line-divider);
}
.stat-item:first-child { border-left: none; }
.stat-number {
    font-family: "DIN Alternate", "Barlow Condensed", "Roboto Mono", monospace;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--accent-neon);
    line-height: 1.2;
    display: block;
    margin-bottom: 10px;
}
.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    letter-spacing: 0.06em;
    font-weight: 400;
}

/* ===== Cases ===== */
.cases-section {
    padding: 96px 0;
}
.case-card {
    display: grid;
    grid-template-columns: 55% 45%;
    gap: 56px;
    align-items: center;
    margin-bottom: 80px;
}
.case-card:last-child { margin-bottom: 0; }
.case-card.reverse { grid-template-columns: 45% 55%; }
.case-card.reverse .case-text { order: -1; }
.case-image {
    border-radius: var(--radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}
.case-image img {
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    transition: transform 0.6s var(--ease);
}
.case-image:hover img { transform: scale(1.03); }
.case-tag {
    display: inline-block;
    font-size: 12px;
    color: var(--accent-neon);
    border: 1px solid rgba(0,229,161,0.3);
    padding: 4px 14px;
    border-radius: 30px;
    margin-bottom: 16px;
    font-weight: 500;
}
.case-text h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.4;
}
.case-text p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}
.case-link {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.4s var(--ease);
}
.case-link:hover {
    color: var(--accent-neon);
    gap: 12px;
}

/* ===== Solutions ===== */
.solutions-section {
    padding: 96px 0;
    background: var(--bg-elev);
    position: relative;
}
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
    margin-top: 48px;
}
.solutions-grid::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}
.solution-item {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-card);
    padding: 28px 24px;
    position: relative;
    transition: border-color 0.4s var(--ease), transform 0.4s var(--ease);
}
.solution-item::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent-neon);
    box-shadow: var(--shadow-glow);
}
.solution-item:hover {
    border-color: rgba(0,229,161,0.3);
    transform: translateY(-4px);
}
.solution-badge {
    position: absolute;
    top: 12px; right: 12px;
    font-size: 11px;
    background: var(--accent-neon);
    color: var(--bg-deep);
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
    letter-spacing: 0.02em;
}
.solution-icon {
    width: 38px; height: 38px;
    color: var(--accent-neon);
    margin-bottom: 16px;
}
.solution-item h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.solution-item p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}
.solutions-bottom {
    text-align: center;
    margin-top: 40px;
    position: relative;
}
.solutions-bottom::before {
    content: '';
    display: block;
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent-neon), transparent);
    margin: 0 auto 24px;
}

/* ===== News ===== */
.news-section {
    padding: 96px 0;
}
.news-list {
    display: flex;
    flex-direction: column;
}
.news-item {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 20px 16px;
    border-bottom: 1px solid var(--line-divider);
    position: relative;
    transition: background 0.4s var(--ease);
}
.news-item:hover {
    background: var(--bg-elev);
}
.news-item::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 3px;
    background: var(--accent-neon);
    border-radius: 2px;
    opacity: 0;
    transition: opacity 0.4s var(--ease);
}
.news-item:hover::before { opacity: 1; }
.news-thumb {
    width: 96px; height: 96px;
    border-radius: var(--radius-card);
    overflow: hidden;
    flex-shrink: 0;
}
.news-thumb img {
    width: 100%; height: 100%;
    object-fit: cover;
}
.news-info {
    flex: 1;
    min-width: 0;
}
.news-info h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 6px;
    transition: color 0.3s var(--ease);
}
.news-info h3 a { text-decoration: none; color: inherit; }
.news-info h3 a:hover { color: var(--accent-neon); }
.news-info p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
}
.news-meta {
    font-size: 12px;
    color: var(--text-weak);
    display: flex;
    gap: 16px;
}
.news-arrow {
    color: var(--text-secondary);
    font-size: 20px;
    text-decoration: none;
    flex-shrink: 0;
    transition: all 0.4s var(--ease);
}
.news-arrow:hover {
    color: var(--accent-neon);
    transform: translateX(4px);
}
.news-empty {
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius-card);
    padding: 48px 20px;
    text-align: center;
    color: var(--text-weak);
    font-size: 14px;
}

/* ===== FAQ ===== */
.faq-section {
    padding: 96px 0;
    background: var(--bg-elev);
}
.faq-list {
    max-width: 760px;
    margin: 0 auto;
}
.faq-item {
    border-bottom: 1px solid var(--line-divider);
}
.faq-item:first-child { border-top: 1px solid var(--line-divider); }
.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 22px 0;
    cursor: pointer;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 600;
    line-height: 1.5;
    transition: color 0.3s var(--ease);
}
.faq-question:hover { color: var(--accent-neon); }
.faq-toggle {
    width: 36px; height: 36px;
    flex-shrink: 0;
    border: 1px solid var(--line-strong);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--text-primary);
    transition: all 0.4s var(--ease);
    background: transparent;
}
.faq-item.active .faq-toggle {
    transform: rotate(45deg);
    border-color: var(--accent-neon);
    color: var(--accent-neon);
    box-shadow: var(--shadow-glow);
}
.faq-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s var(--ease);
}
.faq-content p {
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-secondary);
    padding-bottom: 20px;
    padding-right: 52px;
}

/* ===== Contact / CTA ===== */
.contact-section {
    padding: 96px 0;
}
.cta-banner {
    background: linear-gradient(rgba(0,229,161,0.18), rgba(7,9,13,0.65)), url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
    border-radius: var(--radius-large);
    padding: 72px 48px;
    text-align: center;
    margin-bottom: 64px;
    position: relative;
    overflow: hidden;
}
.cta-banner h2 {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: 16px;
}
.cta-banner p {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 32px;
}
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}
.contact-info h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}
.contact-info-item {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}
.contact-info-item .icon {
    width: 22px; height: 22px;
    flex-shrink: 0;
    color: var(--accent-neon);
}
.contact-info-item strong {
    color: var(--text-primary);
    font-weight: 600;
    display: block;
    font-size: 0.9rem;
    margin-bottom: 2px;
}
.contact-qr {
    margin-top: 24px;
    border: 1px solid var(--border-card);
    border-radius: var(--radius-card);
    padding: 20px;
    background: var(--bg-card);
    display: inline-block;
    text-align: center;
}
.contact-qr svg {
    width: 120px; height: 120px;
    display: block;
    margin: 0 auto 8px;
}
.contact-qr span {
    font-size: 12px;
    color: var(--text-secondary);
}
.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-large);
    padding: 40px;
}
.contact-form h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    letter-spacing: 0.04em;
    margin-bottom: 6px;
}
.form-group input,
.form-group textarea {
    width: 100%;
    background: var(--bg-deep);
    border: 1px solid var(--border-card);
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 14px;
    color: var(--text-primary);
    transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
    font-family: inherit;
}
.form-group textarea {
    height: 100px;
    resize: vertical;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-weak);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-neon);
    box-shadow: var(--shadow-glow);
}
.form-group input:focus-visible,
.form-group textarea:focus-visible {
    outline: 2px solid rgba(0,229,161,0.4);
    outline-offset: 1px;
}

/* ===== Footer ===== */
.site-footer {
    background: var(--bg-deep);
    border-top: 2px solid var(--accent-neon);
    padding: 64px 0 32px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}
.footer-brand .brand-text {
    margin-bottom: 8px;
}
.footer-brand .brand-line {
    margin-bottom: 16px;
}
.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 360px;
}
.footer-col h4 {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 20px;
}
.footer-col ul li {
    margin-bottom: 12px;
}
.footer-col a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s var(--ease);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.footer-col a::before {
    content: '';
    width: 4px; height: 4px;
    border-radius: 50%;
    background: var(--accent-neon);
    opacity: 0;
    transition: opacity 0.3s var(--ease);
}
.footer-col a:hover {
    color: var(--accent-neon);
}
.footer-col a:hover::before {
    opacity: 1;
}
.footer-bottom {
    border-top: 1px solid var(--line-divider);
    padding-top: 24px;
    text-align: center;
    color: var(--text-weak);
    font-size: 13px;
    line-height: 1.8;
}
.footer-bottom .icp {
    display: block;
    margin-top: 4px;
    font-size: 12px;
}

/* ===== Responsive ===== */
@media (max-width: 1279px) {
    .stats-grid { grid-template-columns: repeat(3, 1fr); }
    .stat-item { border-left: none; }
    .stat-item:nth-child(2) { border-left: 1px solid var(--line-divider); }
    .stat-item:nth-child(3) { border-left: 1px solid var(--line-divider); }
    .stat-item:nth-child(4) { border-top: 1px solid var(--line-divider); }
    .solutions-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .solutions-grid::before { display: none; }
    .solution-item::before { top: -1px; }
}
@media (max-width: 1023px) {
    .hero-content { flex: 0 0 100%; max-width: 100%; }
    .hero-decor { display: none; }
    .case-card { grid-template-columns: 1fr; gap: 32px; }
    .case-card.reverse { grid-template-columns: 1fr; }
    .case-card.reverse .case-text { order: 0; }
    .contact-grid { grid-template-columns: 1fr; gap: 48px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 767px) {
    .container { padding: 0 20px; }
    .nav-container { padding: 0 20px; }
    .menu-toggle {
        display: inline-flex;
    }
    .nav-links {
        position: fixed;
        top: 60px; left: 0; right: 0; bottom: 0;
        background: var(--bg-deep);
        flex-direction: column;
        align-items: flex-end;
        justify-content: flex-start;
        padding: 48px 28px;
        gap: 28px;
        transform: translateX(100%);
        transition: transform 0.5s var(--ease);
        z-index: 999;
    }
    .nav-links.open {
        transform: translateX(0);
    }
    .nav-links a {
        font-size: 1.3rem;
        font-weight: 600;
        padding: 8px 12px;
    }
    .nav-links a.active {
        color: var(--accent-neon);
    }
    .nav-links a.active::before {
        content: '';
        position: absolute;
        left: 0; top: 50%;
        transform: translateY(-50%);
        width: 4px; height: 22px;
        background: var(--accent-neon);
        border-radius: 2px;
        box-shadow: var(--shadow-glow);
    }
    .nav-links a.active::after {
        display: none;
    }
    .nav-cta {
        display: none;
    }
    .site-header {
        height: 60px;
    }
    .hero {
        min-height: 86vh;
        padding: 110px 0 80px;
    }
    .hero-container {
        padding: 0 20px;
    }
    .hero-title {
        font-size: clamp(2rem, 8vw, 2.6rem);
        line-height: 1.2;
    }
    .hero-sub {
        font-size: 16px;
        line-height: 1.75;
    }
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    .btn-primary, .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    .section-header h2 {
        font-size: 1.4rem;
    }
    .services-section,
    .stats-section,
    .cases-section,
    .solutions-section,
    .news-section,
    .faq-section,
    .contact-section {
        padding: 64px 0;
    }
    .service-item {
        flex-direction: column;
        align-items: flex-start;
        height: auto;
        padding: 24px 16px;
        gap: 12px;
    }
    .service-number {
        width: auto;
        font-size: 1.8rem;
    }
    .service-arrow {
        align-self: flex-end;
        margin-top: -4px;
    }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .stat-item {
        border-left: none;
        padding: 20px 12px;
    }
    .stat-item:nth-child(odd) { border-left: none; }
    .stat-item:nth-child(even) { border-left: 1px solid var(--line-divider); }
    .stat-number {
        font-size: 2rem;
    }
    .case-card {
        grid-template-columns: 1fr;
        margin-bottom: 48px;
    }
    .case-text h3 {
        font-size: 1.2rem;
    }
    .solutions-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .solution-item {
        padding: 24px 20px;
    }
    .solution-item::before {
        left: 24px;
        transform: none;
    }
    .news-item {
        flex-direction: column;
        align-items: flex-start;
        padding: 20px 12px;
        gap: 16px;
    }
    .news-thumb {
        width: 80px; height: 80px;
    }
    .news-info h3 {
        white-space: normal;
        font-size: 15px;
    }
    .news-arrow {
        position: absolute;
        right: 12px;
        bottom: 20px;
    }
    .news-meta {
        gap: 12px;
    }
    .faq-content p {
        padding-right: 0;
    }
    .cta-banner {
        padding: 48px 20px;
    }
    .cta-banner h2 {
        font-size: 1.6rem;
    }
    .contact-form {
        padding: 24px 20px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}
@media (max-width: 520px) {
    .stats-grid { grid-template-columns: 1fr; }
    .stat-item { border-left: none !important; border-bottom: 1px solid var(--line-divider); }
    .hero-title {
        font-size: 2rem;
    }
    .case-image {
        border-radius: 14px;
    }
    .solution-item {
        padding: 20px 16px;
    }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation: none !important;
        transition: none !important;
    }
    html { scroll-behavior: auto; }
}
@media print {
    body {
        background: #fff;
        color: #000;
    }
    .site-header,
    .site-footer,
    .cta-banner,
    .contact-form,
    .scroll-indicator,
    .nav-cta,
    .menu-toggle {
        display: none !important;
    }
    .container {
        max-width: 100%;
        padding: 0 20px;
    }
    .hero {
        min-height: auto;
        background: none;
        padding: 40px 0;
    }
    .hero-title {
        color: #000;
    }
    .hero-sub {
        color: #333;
    }
    .stats-section,
    .solutions-section,
    .faq-section {
        background: #fff;
    }
    .stat-number {
        color: #000;
    }
    .stat-label {
        color: #333;
    }
    .case-text h3,
    .solution-item h3,
    .section-header h2,
    .contact-info h3,
    .footer-col h4 {
        color: #000;
    }
    .case-text p,
    .solution-item p,
    .faq-content p,
    .contact-info-item,
    .footer-brand p {
        color: #333;
    }
    .service-item,
    .news-item,
    .faq-item,
    .solution-item {
        border-color: #ddd;
        background: #fff;
    }
}

/* roulang page: article */
:root {
            --bg-deep: #07090D;
            --bg-elev: #0E1117;
            --bg-card: #151A22;
            --bg-hover: #1C222C;
            --text-primary: #EEF2F5;
            --text-secondary: #9AA3AD;
            --text-weak: #5C646F;
            --accent-neon: #00E5A1;
            --accent-soft: #8A7CFF;
            --line-divider: rgba(255,255,255,0.06);
            --line-strong: rgba(255,255,255,0.12);
            --border-card: rgba(255,255,255,0.07);
            --shadow-card: 0 8px 28px rgba(0,0,0,0.4);
            --shadow-glow: 0 0 20px rgba(0,229,161,0.25);
            --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
            --font-num: "DIN Alternate", "Barlow Condensed", "Roboto Mono", monospace;
            --radius-btn: 6px;
            --radius-card: 12px;
            --radius-lg: 20px;
            --ease: cubic-bezier(0.22, 1, 0.36, 1);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

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

        a {
            color: inherit;
            text-decoration: none;
        }

        button, input, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }

        ul, ol {
            list-style: none;
        }

        h1, h2, h3, h4 {
            line-height: 1.3;
            font-weight: 800;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
        }

        @media (max-width: 767px) {
            .container {
                padding: 0 20px;
            }
        }

        /* ===== 阅读进度条 ===== */
        .reading-progress {
            position: fixed;
            top: 0;
            left: 0;
            height: 2px;
            width: 0%;
            background: var(--accent-neon);
            box-shadow: 0 0 12px rgba(0, 229, 161, 0.6);
            z-index: 2000;
            transition: width 0.1s linear;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 72px;
            background: rgba(7, 9, 13, 0.9);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--line-divider);
            z-index: 1000;
            transition: background 0.4s var(--ease), box-shadow 0.4s var(--ease);
        }

        .site-header.scrolled {
            background: rgba(7, 9, 13, 0.98);
            box-shadow: 0 4px 24px rgba(0,0,0,0.3);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .brand-text {
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .brand-line {
            display: inline-block;
            width: 36px;
            height: 2px;
            background: var(--accent-neon);
            box-shadow: var(--shadow-glow);
            border-radius: 2px;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 36px;
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            letter-spacing: 0.02em;
            padding: 8px 0;
            position: relative;
            transition: color 0.3s var(--ease);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--accent-neon);
            border-radius: 2px;
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
        }

        .nav-links a:hover {
            color: var(--text-primary);
        }

        .nav-links a:hover::after {
            transform: scaleX(1);
        }

        .nav-links a.active {
            color: var(--text-primary);
        }

        .nav-links a.active::after {
            transform: scaleX(1);
            box-shadow: 0 0 10px rgba(0, 229, 161, 0.45);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            background: var(--accent-neon);
            color: var(--bg-deep);
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: var(--radius-btn);
            transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
            flex-shrink: 0;
            margin-left: 24px;
        }

        .nav-cta:hover {
            background: #00f0b0;
            box-shadow: 0 0 16px rgba(0, 229, 161, 0.35);
            transform: translateY(-1px);
        }

        .nav-cta:active {
            transform: translateY(0);
            box-shadow: none;
        }

        .nav-toggle {
            display: none;
            width: 42px;
            height: 42px;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.3s var(--ease);
        }

        .nav-toggle:hover {
            background: var(--bg-hover);
        }

        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            position: relative;
            transition: background 0.3s var(--ease);
        }

        .nav-toggle span::before,
        .nav-toggle span::after {
            content: '';
            position: absolute;
            left: 0;
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            transition: transform 0.3s var(--ease), top 0.3s var(--ease);
        }

        .nav-toggle span::before {
            top: -6px;
        }

        .nav-toggle span::after {
            top: 6px;
        }

        .nav-toggle.open span {
            background: transparent;
        }

        .nav-toggle.open span::before {
            top: 0;
            transform: rotate(45deg);
        }

        .nav-toggle.open span::after {
            top: 0;
            transform: rotate(-45deg);
        }

        /* ===== 移动端菜单 ===== */
        .mobile-menu {
            position: fixed;
            inset: 0;
            z-index: 990;
            background: var(--bg-deep);
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            align-items: flex-end;
            padding: 90px 32px 48px;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.4s var(--ease), visibility 0.4s var(--ease);
        }

        .mobile-menu.open {
            opacity: 1;
            visibility: visible;
        }

        .mobile-menu-inner {
            display: flex;
            flex-direction: column;
            align-items: flex-end;
            gap: 8px;
            width: 100%;
        }

        .mobile-link {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-secondary);
            padding: 12px 0;
            transition: color 0.3s var(--ease);
            border-right: 3px solid transparent;
            padding-right: 16px;
        }

        .mobile-link:hover,
        .mobile-link.active {
            color: var(--text-primary);
            border-right-color: var(--accent-neon);
        }

        .mobile-cta {
            margin-top: 24px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 36px;
            background: var(--accent-neon);
            color: var(--bg-deep);
            font-weight: 600;
            border-radius: var(--radius-btn);
            font-size: 1rem;
        }

        body.menu-open {
            overflow: hidden;
        }

        /* ===== 文章 Hero ===== */
        .article-hero {
            position: relative;
            padding: 180px 0 80px;
            background: linear-gradient(160deg, rgba(7,9,13,0.92) 0%, rgba(7,9,13,0.78) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            border-bottom: 1px solid var(--line-divider);
        }

        .article-hero::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--accent-neon), transparent);
        }

        .article-hero .container {
            position: relative;
            z-index: 1;
            max-width: 1080px;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.85rem;
            color: var(--text-weak);
            margin-bottom: 28px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-secondary);
            transition: color 0.3s var(--ease);
        }

        .breadcrumb a:hover {
            color: var(--accent-neon);
        }

        .breadcrumb .sep {
            color: var(--text-weak);
        }

        .breadcrumb .current {
            color: var(--text-secondary);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            max-width: 400px;
        }

        .article-hero h1 {
            font-size: clamp(1.8rem, 3.4vw, 2.6rem);
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 24px;
            max-width: 900px;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 24px;
            flex-wrap: wrap;
        }

        .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-secondary);
        }

        .meta-item svg {
            width: 16px;
            height: 16px;
            stroke: var(--accent-neon);
            fill: none;
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .meta-divider {
            width: 1px;
            height: 14px;
            background: var(--line-strong);
        }

        /* ===== 文章正文 ===== */
        .article-section {
            padding: 72px 0 48px;
        }

        .article-container {
            max-width: 840px;
            margin: 0 auto;
        }

        .article-content {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-primary);
        }

        .article-content > * + * {
            margin-top: 1.2em;
        }

        .article-content h2 {
            font-size: 1.4rem;
            font-weight: 700;
            line-height: 1.4;
            margin-top: 2.2em;
            margin-bottom: 0.8em;
            padding-left: 16px;
            border-left: 4px solid var(--accent-neon);
        }

        .article-content h3 {
            font-size: 1.18rem;
            font-weight: 700;
            line-height: 1.4;
            margin-top: 1.8em;
            margin-bottom: 0.6em;
        }

        .article-content h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-top: 1.4em;
            margin-bottom: 0.5em;
        }

        .article-content p {
            color: var(--text-primary);
            line-height: 1.85;
            margin-bottom: 1.2em;
        }

        .article-content a {
            color: var(--accent-neon);
            text-decoration: underline;
            text-underline-offset: 4px;
            transition: color 0.3s var(--ease);
        }

        .article-content a:hover {
            color: #00f0b0;
        }

        .article-content blockquote {
            border-left: 3px solid var(--accent-neon);
            padding: 16px 24px;
            background: var(--bg-elev);
            color: var(--text-secondary);
            border-radius: 0 12px 12px 0;
            margin: 1.8em 0;
        }

        .article-content blockquote p {
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        .article-content ul,
        .article-content ol {
            padding-left: 1.4em;
            margin: 1.2em 0;
        }

        .article-content ul {
            list-style: disc;
        }

        .article-content ol {
            list-style: decimal;
        }

        .article-content li {
            margin-bottom: 0.5em;
            line-height: 1.8;
            color: var(--text-primary);
        }

        .article-content li::marker {
            color: var(--accent-neon);
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.8em 0;
            font-size: 0.95rem;
        }

        .article-content th,
        .article-content td {
            border: 1px solid var(--line-divider);
            padding: 12px 16px;
            text-align: left;
        }

        .article-content th {
            background: var(--bg-elev);
            font-weight: 700;
            color: var(--text-primary);
        }

        .article-content tbody tr:nth-child(even) {
            background: var(--bg-elev);
        }

        .article-content img {
            border-radius: var(--radius-card);
            border: 1px solid var(--border-card);
            max-width: 100%;
            height: auto;
            margin: 1.6em 0;
        }

        .article-content code {
            background: var(--bg-elev);
            border-radius: 4px;
            padding: 2px 8px;
            font-size: 0.9em;
            color: var(--accent-neon);
            font-family: var(--font-num);
        }

        .article-content pre {
            background: var(--bg-elev);
            border-radius: var(--radius-card);
            padding: 20px;
            overflow-x: auto;
            margin: 1.6em 0;
            border: 1px solid var(--border-card);
        }

        .article-content pre code {
            background: transparent;
            color: var(--text-primary);
            padding: 0;
            font-size: 0.9em;
        }

        .article-content hr {
            border: none;
            height: 1px;
            background: var(--line-divider);
            margin: 2.4em 0;
        }

        .article-content strong {
            font-weight: 700;
            color: var(--text-primary);
        }

        /* ===== 内容未找到 ===== */
        .content-not-found {
            text-align: center;
            padding: 80px 24px;
            background: var(--bg-elev);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--line-strong);
        }

        .content-not-found h2 {
            font-size: 1.6rem;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .content-not-found p {
            color: var(--text-secondary);
            margin-bottom: 28px;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            background: var(--accent-neon);
            color: var(--bg-deep);
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: var(--radius-btn);
            cursor: pointer;
            transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
        }

        .btn-primary:hover {
            background: #00f0b0;
            box-shadow: 0 0 16px rgba(0, 229, 161, 0.35);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            background: transparent;
            color: var(--text-primary);
            font-size: 0.95rem;
            font-weight: 500;
            border: 1px solid var(--line-strong);
            border-radius: var(--radius-btn);
            cursor: pointer;
            transition: border-color 0.3s var(--ease), color 0.3s var(--ease), box-shadow 0.3s var(--ease);
        }

        .btn-outline:hover {
            border-color: var(--accent-neon);
            color: var(--accent-neon);
            box-shadow: 0 0 12px rgba(0, 229, 161, 0.12);
        }

        /* ===== 标签 ===== */
        .article-tags {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 48px;
            padding-top: 28px;
            border-top: 1px solid var(--line-divider);
        }

        .tag-label {
            font-size: 0.85rem;
            color: var(--text-weak);
        }

        .tag {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: 999px;
            font-size: 0.8rem;
            color: var(--text-secondary);
            transition: background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
        }

        .tag:hover {
            background: var(--bg-hover);
            color: var(--accent-neon);
            border-color: var(--accent-neon);
        }

        /* ===== 返回链接 ===== */
        .article-footer-nav {
            margin-top: 40px;
        }

        .back-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            transition: color 0.3s var(--ease);
        }

        .back-link:hover {
            color: var(--accent-neon);
        }

        /* ===== 相关推荐 ===== */
        .related-posts {
            padding: 72px 0 96px;
            background: var(--bg-elev);
            margin-top: 48px;
        }

        .related-posts .section-title {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: clamp(1.4rem, 2.4vw, 1.8rem);
            font-weight: 800;
            margin-bottom: 40px;
        }

        .section-title-bar {
            width: 4px;
            height: 24px;
            background: var(--accent-neon);
            border-radius: 2px;
            box-shadow: var(--shadow-glow);
            flex-shrink: 0;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            display: flex;
            flex-direction: column;
            background: var(--bg-deep);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
        }

        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
            border-color: rgba(0, 229, 161, 0.3);
        }

        .related-thumb {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-bottom: 1px solid var(--line-divider);
        }

        .related-info {
            padding: 20px 20px 24px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            flex: 1;
        }

        .related-info h3 {
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.5;
            color: var(--text-primary);
            transition: color 0.3s var(--ease);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card:hover .related-info h3 {
            color: var(--accent-neon);
        }

        .related-date {
            font-size: 0.8rem;
            color: var(--text-weak);
            font-family: var(--font-num);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-deep);
            padding: 72px 0 0;
            position: relative;
        }

        .site-footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, transparent, var(--accent-neon), transparent);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 48px;
        }

        .footer-brand .brand-text {
            font-size: 1.2rem;
            margin-bottom: 8px;
            display: block;
        }

        .footer-brand .brand-line {
            display: inline-block;
            width: 36px;
            height: 2px;
            background: var(--accent-neon);
            box-shadow: var(--shadow-glow);
            border-radius: 2px;
            margin-bottom: 16px;
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.75;
            max-width: 360px;
        }

        .footer-col h4 {
            font-size: 0.95rem;
            color: var(--text-primary);
            margin-bottom: 20px;
            font-weight: 700;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-col ul a {
            font-size: 0.88rem;
            color: var(--text-secondary);
            transition: color 0.3s var(--ease);
            position: relative;
            padding-left: 0;
        }

        .footer-col ul a::before {
            content: '';
            position: absolute;
            left: -14px;
            top: 50%;
            transform: translateY(-50%);
            width: 5px;
            height: 5px;
            border-radius: 50%;
            background: var(--accent-neon);
            opacity: 0;
            transition: opacity 0.3s var(--ease);
        }

        .footer-col ul a:hover {
            color: var(--text-primary);
            padding-left: 14px;
        }

        .footer-col ul a:hover::before {
            opacity: 1;
        }

        .footer-bottom {
            border-top: 1px solid var(--line-divider);
            padding: 24px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer-bottom span {
            font-size: 0.8rem;
            color: var(--text-weak);
        }

        .footer-bottom .icp {
            font-family: var(--font-num);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(3, 1fr);
            }

            .nav-links {
                gap: 24px;
            }
        }

        @media (max-width: 767px) {
            .site-header {
                height: 60px;
            }

            .nav-container {
                padding: 0 20px;
            }

            .nav-links,
            .nav-cta {
                display: none;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .brand-text {
                font-size: 1rem;
            }

            .brand-line {
                width: 24px;
            }

            .article-hero {
                padding: 130px 0 56px;
            }

            .article-hero h1 {
                font-size: 1.5rem;
            }

            .article-meta {
                gap: 12px;
                flex-direction: column;
                align-items: flex-start;
            }

            .meta-divider {
                display: none;
            }

            .article-section {
                padding: 48px 0 32px;
            }

            .related-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .related-thumb {
                height: 140px;
            }

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

            .footer-brand p {
                max-width: 100%;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 520px) {
            .article-content {
                font-size: 15px;
            }

            .article-content h2 {
                font-size: 1.25rem;
            }

            .article-content h3 {
                font-size: 1.08rem;
            }

            .article-content table {
                display: block;
                overflow-x: auto;
            }

            .breadcrumb .current {
                max-width: 200px;
            }
        }

        /* ===== 打印样式 ===== */
        @media print {
            .site-header,
            .site-footer,
            .related-posts,
            .article-footer-nav,
            .reading-progress,
            .mobile-menu,
            .nav-toggle {
                display: none !important;
            }

            body {
                background: #fff;
                color: #222;
            }

            .article-hero {
                background: #fff !important;
                color: #222;
                padding: 40px 0;
            }

            .article-hero h1,
            .article-content,
            .article-content p,
            .article-content strong,
            .article-content li {
                color: #222;
            }

            .article-content a {
                color: #333;
            }

            .article-content blockquote {
                background: #f5f5f5;
                color: #555;
            }

            .article-content th,
            .article-content td {
                border-color: #ccc;
            }

            .article-content tbody tr:nth-child(even) {
                background: #f5f5f5;
            }
        }

        /* ===== 动效适配 ===== */
        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation: none !important;
                transition: none !important;
            }

            html {
                scroll-behavior: auto;
            }
        }

/* roulang page: category1 */
:root{
  --bg-deep:#07090D;
  --bg-elev:#0E1117;
  --bg-card:#151A22;
  --bg-hover:#1C222C;
  --text-primary:#EEF2F5;
  --text-secondary:#9AA3AD;
  --text-weak:#5C646F;
  --accent-neon:#00E5A1;
  --accent-soft:#8A7CFF;
  --line-divider:rgba(255,255,255,0.06);
  --line-strong:rgba(255,255,255,0.12);
  --border-card:rgba(255,255,255,0.07);
  --shadow-card:0 8px 28px rgba(0,0,0,0.4);
  --shadow-glow:0 0 20px rgba(0,229,161,0.25);
  --radius-btn:6px;
  --radius-card:12px;
  --radius-lg:20px;
  --container-max:1280px;
  --ease:cubic-bezier(0.22,1,0.36,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",sans-serif;
  font-size:16px;line-height:1.8;color:var(--text-primary);
  background:var(--bg-deep);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;border:none;background:none;cursor:pointer;color:inherit}
ul,ol{list-style:none}
input,textarea{font-family:inherit}

.container{
  width:100%;max-width:var(--container-max);
  margin:0 auto;padding:0 32px;
}

/* Buttons */
.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--accent-neon);color:var(--bg-deep);
  font-size:.95rem;font-weight:600;letter-spacing:.02em;
  border-radius:var(--radius-btn);padding:14px 28px;
  transition:background .4s var(--ease),box-shadow .4s var(--ease),transform .4s var(--ease);
  line-height:1.2;white-space:nowrap;
}
.btn-primary:hover{
  background:#19f0b2;
  box-shadow:0 0 16px rgba(0,229,161,0.35);
  transform:translateY(-2px);
}
.btn-primary:active{transform:translateY(0)}
.btn-outline{
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--line-strong);
  color:var(--text-primary);
  background:rgba(255,255,255,0.02);
  font-size:.95rem;font-weight:500;letter-spacing:.02em;
  border-radius:var(--radius-btn);padding:13px 28px;
  transition:border-color .4s var(--ease),color .4s var(--ease),box-shadow .4s var(--ease),transform .4s var(--ease);
  line-height:1.2;white-space:nowrap;
}
.btn-outline:hover{
  border-color:var(--accent-neon);
  color:var(--accent-neon);
  box-shadow:0 0 12px rgba(0,229,161,0.15);
  transform:translateY(-2px);
}
.btn-sm{padding:10px 22px;font-size:.9rem}
a:focus-visible,button:focus-visible{
  outline:2px solid var(--accent-neon);
  outline-offset:3px;
}

/* Header */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  height:72px;
  background:rgba(7,9,13,0.9);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line-divider);
  transition:background .4s var(--ease);
}
.site-header.scrolled{background:rgba(7,9,13,0.98)}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;gap:24px;
}
.site-logo{display:flex;align-items:center;gap:12px;flex-shrink:0}
.logo-text{
  font-size:1.2rem;font-weight:800;letter-spacing:.04em;
  color:var(--text-primary);line-height:1.2;
}
.logo-line{
  display:block;width:36px;height:2px;
  background:var(--accent-neon);
  box-shadow:var(--shadow-glow);
  border-radius:2px;
}
.nav-links{display:flex;align-items:center;gap:36px}
.nav-links a{
  position:relative;
  font-size:.95rem;font-weight:500;letter-spacing:.02em;
  color:var(--text-secondary);
  padding:6px 0;
  transition:color .3s var(--ease);
}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:-2px;
  width:100%;height:2px;
  background:var(--accent-neon);
  transform:scaleX(0);transform-origin:left;
  transition:transform .4s var(--ease);
  box-shadow:var(--shadow-glow);
}
.nav-links a:hover{color:var(--text-primary)}
.nav-links a:hover::after{transform:scaleX(1)}
.nav-links a.active{
  color:var(--text-primary);
}
.nav-links a.active::after{transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:16px}
.menu-toggle{
  display:none;flex-direction:column;gap:5px;
  width:40px;height:40px;justify-content:center;align-items:center;
  border:1px solid var(--line-strong);border-radius:var(--radius-btn);
  transition:border-color .3s var(--ease);
}
.menu-toggle span{
  display:block;width:18px;height:2px;
  background:var(--text-primary);
  border-radius:2px;
  transition:background .3s var(--ease),transform .3s var(--ease),opacity .3s var(--ease);
}
.menu-toggle:hover{border-color:var(--accent-neon)}
.menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle.open span:nth-child(2){opacity:0}
.menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Page Hero */
.page-hero{
  position:relative;
  padding:160px 0 80px;
  min-height:520px;
  display:flex;align-items:center;
  overflow:hidden;
}
.page-hero .hero-bg{
  position:absolute;inset:0;z-index:-2;
  background-size:cover;background-position:center;
}
.page-hero .hero-bg::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,
    rgba(7,9,13,0.82) 0%,
    rgba(7,9,13,0.55) 45%,
    rgba(7,9,13,0.95) 100%
  );
}
.page-hero-content{max-width:860px}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.75rem;letter-spacing:.08em;
  color:var(--accent-neon);
  border:1px solid rgba(0,229,161,0.35);
  border-radius:999px;
  padding:6px 16px;
  margin-bottom:28px;
  background:rgba(0,229,161,0.05);
}
.hero-badge::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--accent-neon);
  box-shadow:0 0 8px rgba(0,229,161,0.8);
  animation:blink 2.4s infinite;
}
@keyframes blink{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.5;transform:scale(.8)}
}
.page-hero h1{
  font-size:clamp(2.2rem,4vw,3.4rem);
  font-weight:800;line-height:1.2;
  letter-spacing:.02em;
  margin-bottom:24px;
  color:var(--text-primary);
}
.page-hero h1 .highlight{
  color:var(--accent-neon);
  text-shadow:0 0 24px rgba(0,229,161,0.3);
}
.hero-sub{
  font-size:1.05rem;
  color:var(--text-secondary);
  max-width:620px;
  line-height:1.7;
}

/* Anchor cards */
.anchor-cards{
  display:flex;gap:20px;
  margin-top:48px;
  flex-wrap:wrap;
}
.anchor-card{
  display:flex;align-items:center;gap:12px;
  background:rgba(21,26,34,0.7);
  border:1px solid var(--border-card);
  border-radius:var(--radius-card);
  padding:18px 28px;
  font-size:.95rem;font-weight:600;
  color:var(--text-primary);
  transition:border-color .4s var(--ease),box-shadow .4s var(--ease),transform .4s var(--ease);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.anchor-card .card-icon{
  width:38px;height:38px;border-radius:10px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(0,229,161,0.1);
  color:var(--accent-neon);
  flex-shrink:0;
}
.anchor-card:hover{
  border-color:var(--accent-neon);
  box-shadow:var(--shadow-glow);
  transform:translateY(-3px);
}
.anchor-card .arrow{
  color:var(--text-weak);
  transition:transform .4s var(--ease),color .4s var(--ease);
}
.anchor-card:hover .arrow{
  transform:translateX(4px);color:var(--accent-neon);
}

/* Content Sections */
.content-wrap{padding:96px 0}
.content-wrap .section-head{
  max-width:700px;margin-bottom:64px;
}
.section-head .sec-tag{
  display:inline-block;
  font-size:.75rem;letter-spacing:.1em;
  color:var(--accent-neon);
  text-transform:uppercase;
  margin-bottom:12px;
}
.section-head h2{
  font-size:clamp(1.5rem,2.4vw,2.1rem);
  font-weight:800;line-height:1.28;
  padding-left:16px;
  position:relative;
}
.section-head h2::before{
  content:"";position:absolute;left:0;top:6px;bottom:6px;
  width:4px;height:24px;
  background:var(--accent-neon);
  border-radius:2px;
  box-shadow:var(--shadow-glow);
}
.section-head p{
  margin-top:16px;color:var(--text-secondary);font-size:.95rem;
}

.content-block{
  display:grid;grid-template-columns:1fr 1.6fr;
  gap:60px;align-items:center;
  padding:64px 0;
  border-bottom:1px dashed var(--line-divider);
}
.content-block:last-child{border-bottom:none}
.content-block.reverse .block-img{order:2}
.content-block.reverse .block-text{order:1}
.block-img{
  border-radius:var(--radius-lg);
  overflow:hidden;
  position:relative;
  box-shadow:var(--shadow-card);
  aspect-ratio:4/3;
  background:var(--bg-elev);
}
.block-img img{
  width:100%;height:100%;object-fit:cover;
  transition:transform .8s var(--ease);
}
.block-img:hover img{transform:scale(1.04)}
.block-img::after{
  content:"";position:absolute;inset:0;
  border:1px solid var(--border-card);
  border-radius:var(--radius-lg);
  pointer-events:none;
}
.block-text .step-num{
  font-family:"DIN Alternate","Roboto Mono",monospace;
  font-size:2.4rem;font-weight:700;
  color:var(--accent-neon);
  line-height:1;
  display:block;margin-bottom:16px;
  opacity:.85;
}
.block-text h3{
  font-size:1.35rem;font-weight:700;
  margin-bottom:16px;color:var(--text-primary);
}
.block-text p{
  color:var(--text-secondary);
  font-size:.98rem;line-height:1.85;
}

/* Process Section */
.process-section{
  padding:96px 0;
  background:var(--bg-elev);
  position:relative;
  overflow:hidden;
}
.process-section::before{
  content:"";position:absolute;top:-120px;left:50%;
  transform:translateX(-50%);
  width:600px;height:300px;
  background:radial-gradient(ellipse,rgba(0,229,161,0.08),transparent 70%);
  pointer-events:none;
}
.process-grid{
  position:relative;
  display:grid;
  grid-template-columns:repeat(6,1fr);
  gap:0;
  margin-top:56px;
}
.process-grid::before{
  content:"";position:absolute;top:8px;left:4%;right:4%;
  height:1px;background:var(--line-strong);
}
.process-item{
  position:relative;
  padding:36px 14px 0;
}
.process-item::before{
  content:"";position:absolute;
  top:2px;left:14px;
  width:8px;height:8px;border-radius:50%;
  background:var(--accent-neon);
  box-shadow:0 0 10px rgba(0,229,161,0.6);
}
.process-item .p-step{
  font-family:"DIN Alternate","Roboto Mono",monospace;
  font-size:.8rem;color:var(--accent-neon);
  letter-spacing:.1em;
  margin-bottom:10px;display:block;
}
.process-item h4{
  font-size:1rem;font-weight:700;color:var(--text-primary);
  margin-bottom:8px;line-height:1.4;
}
.process-item p{
  font-size:.82rem;color:var(--text-secondary);
  line-height:1.6;
}

/* FAQ Section */
.faq-section{
  padding:96px 0;
}
.faq-list{
  max-width:760px;margin:56px auto 0;
}
.faq-item{
  border-bottom:1px solid var(--line-divider);
}
.faq-item:first-child{border-top:1px solid var(--line-divider)}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;
  gap:20px;
  padding:24px 0;
  width:100%;text-align:left;
  font-size:1rem;font-weight:600;color:var(--text-primary);
  transition:color .3s var(--ease);
  cursor:pointer;
}
.faq-toggle{
  width:36px;height:36px;flex-shrink:0;
  border:1px solid var(--line-strong);
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:1.1rem;
  color:var(--text-secondary);
  transition:transform .45s var(--ease),border-color .3s var(--ease),color .3s var(--ease);
}
.faq-item.open .faq-toggle{
  transform:rotate(45deg);
  border-color:var(--accent-neon);
  color:var(--accent-neon);
}
.faq-q:hover{color:var(--accent-neon)}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .5s var(--ease);
}
.faq-a-inner{
  padding:0 0 24px;
  font-size:.9rem;color:var(--text-secondary);
  line-height:1.8;
  max-width:660px;
}

/* CTA Section */
.cta-section{
  padding:96px 0 120px;
}
.cta-banner{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  padding:80px 60px;
  background-size:cover;background-position:center;
  text-align:center;
}
.cta-banner::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(135deg,
    rgba(7,9,13,0.92) 0%,
    rgba(14,17,23,0.82) 50%,
    rgba(0,229,161,0.15) 100%
  );
}
.cta-content{position:relative;z-index:2}
.cta-content h2{
  font-size:clamp(1.6rem,3vw,2.4rem);
  font-weight:800;line-height:1.25;
  margin-bottom:16px;
}
.cta-content p{
  color:var(--text-secondary);
  font-size:1rem;margin-bottom:36px;
  max-width:520px;margin-left:auto;margin-right:auto;
}

/* Footer */
.site-footer{
  background:var(--bg-deep);
  border-top:2px solid transparent;
  border-image:linear-gradient(90deg,transparent,var(--accent-neon),var(--accent-soft),transparent) 1;
  padding:64px 0 32px;
  min-height:280px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr;
  gap:56px;
  margin-bottom:48px;
}
.footer-brand .brand-text{
  font-size:1.2rem;font-weight:800;color:var(--text-primary);
  margin-bottom:12px;
}
.brand-line{
  width:36px;height:2px;
  background:var(--accent-neon);
  box-shadow:var(--shadow-glow);
  border-radius:2px;
  margin-bottom:16px;
}
.footer-brand p{
  color:var(--text-secondary);font-size:.88rem;line-height:1.7;
  max-width:360px;
}
.footer-col h4{
  font-size:.9rem;font-weight:700;color:var(--text-primary);
  margin-bottom:20px;letter-spacing:.05em;
}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{
  position:relative;
  font-size:.88rem;color:var(--text-secondary);
  transition:color .3s var(--ease);
  padding-left:16px;
}
.footer-col ul a::before{
  content:"";position:absolute;left:0;top:50%;
  transform:translateY(-50%);
  width:4px;height:4px;border-radius:50%;
  background:var(--text-weak);
  transition:background .3s var(--ease),box-shadow .3s var(--ease);
}
.footer-col ul a:hover{
  color:var(--accent-neon);
}
.footer-col ul a:hover::before{
  background:var(--accent-neon);
  box-shadow:0 0 8px rgba(0,229,161,0.6);
}
.footer-bottom{
  border-top:1px solid var(--line-divider);
  padding-top:24px;
  display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:12px;
  font-size:.8rem;color:var(--text-weak);
}
.footer-bottom .icp{color:var(--text-weak)}

/* Back to top / bottom link */
.return-link{
  display:inline-flex;align-items:center;gap:10px;
  margin-top:56px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-btn);
  padding:14px 28px;
  font-size:.95rem;font-weight:500;color:var(--text-primary);
  transition:border-color .4s var(--ease),color .4s var(--ease),box-shadow .4s var(--ease),transform .4s var(--ease);
}
.return-link:hover{
  border-color:var(--accent-neon);
  color:var(--accent-neon);
  box-shadow:0 0 12px rgba(0,229,161,0.15);
  transform:translateX(-4px);
}
.return-link .arrow-icon{
  transition:transform .4s var(--ease);
}
.return-link:hover .arrow-icon{
  transform:translateX(-4px);
}

/* Responsive */
@media (max-width:1279px){
  .process-grid{grid-template-columns:repeat(3,1fr);gap:40px 20px}
  .process-grid::before{display:none}
  .process-item{padding-top:20px}
  .process-item::before{top:14px}
}
@media (max-width:1023px){
  .menu-toggle{display:flex}
  .nav-links{
    position:fixed;top:72px;right:0;left:0;
    flex-direction:column;align-items:flex-end;
    background:rgba(7,9,13,0.98);
    padding:32px 32px 40px;
    gap:8px;
    border-bottom:1px solid var(--line-divider);
    transform:translateY(-12px);
    opacity:0;visibility:hidden;
    transition:transform .4s var(--ease),opacity .3s var(--ease),visibility .3s;
  }
  .nav-links.open{
    transform:translateY(0);
    opacity:1;visibility:visible;
  }
  .nav-links a{
    font-size:1.1rem;
    padding:12px 0 12px 16px;
    position:relative;
    width:200px;text-align:right;
  }
  .nav-links a::after{display:none}
  .nav-links a.active{
    border-left:3px solid var(--accent-neon);
    box-shadow:inset 2px 0 12px rgba(0,229,161,0.08);
    color:var(--accent-neon);
  }
  .header-cta{display:none}
  .page-hero{padding:140px 0 64px;min-height:auto}
  .content-block{grid-template-columns:1fr;gap:40px}
  .content-block.reverse .block-img{order:1}
  .content-block.reverse .block-text{order:2}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:767px){
  .container{padding:0 20px}
  .page-hero{padding:120px 0 48px}
  .page-hero h1{font-size:2rem}
  .hero-sub{font-size:.95rem}
  .anchor-cards{flex-direction:column}
  .anchor-card{width:100%}
  .content-wrap{padding:64px 0}
  .process-grid{grid-template-columns:1fr 1fr;gap:32px 16px}
  .faq-section,.process-section{padding:64px 0}
  .cta-section{padding:64px 0 80px}
  .cta-banner{padding:48px 24px}
  .cta-banner h2{font-size:1.4rem}
  .footer-grid{grid-template-columns:1fr;gap:40px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .section-head{margin-bottom:40px}
  .content-block{padding:48px 0;gap:28px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:0.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:0.01ms !important;
    scroll-behavior:auto !important;
  }
}

/* Print */
@media print{
  body{background:#fff;color:#222}
  .site-header,.menu-toggle,.header-cta,.anchor-cards,.return-link,.cta-section,.site-footer{display:none !important}
  .page-hero{padding:40px 0;background:#fff}
  .page-hero h1,.block-text h3{color:#111}
  .page-hero .hero-bg::after{display:none}
  .content-block{display:block;padding:20px 0;border-bottom:1px solid #ddd}
  .block-img{margin-bottom:12px;border-radius:0}
  .process-section,.faq-section{background:#fff;color:#222}
  .faq-a{max-height:none}
}