/* roulang page: index */
:root {
    --bg-primary: #0B0E0C;
    --bg-card: #121916;
    --brand-primary: #0FCF97;
    --brand-secondary: #7B6CFF;
    --accent-warm: #F5B84B;
    --text-primary: #E7EEEA;
    --text-secondary: #9AA8A0;
    --text-muted: #5A6660;
    --border-light: rgba(255, 255, 255, 0.08);
    --radius-card: 14px;
    --radius-btn: 10px;
    --radius-img: 12px;
    --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.25);
    --shadow-hover: 0 0 0 1px rgba(15, 207, 151, 0.3), 0 16px 40px rgba(0, 0, 0, 0.4);
  }
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  html {
    scroll-behavior: smooth;
  }
  body {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
  }
  a {
    color: inherit;
    text-decoration: none;
    transition: color .2s;
  }
  img {
    max-width: 100%;
    display: block;
  }
  button,
  input {
    font-family: inherit;
  }
  .container {
    max-width: 1280px;
    margin: 0 auto;
    padding-left: 16px;
    padding-right: 16px;
  }

  /* header */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    background: rgba(11, 14, 12, 0.72);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: background .3s, border-color .3s, box-shadow .3s;
  }
  .site-header.scrolled {
    background: rgba(11, 14, 12, 0.92);
    border-bottom-color: var(--border-light);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  }
  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .logo {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 4px;
  }
  .logo .logo-mark {
    color: var(--brand-primary);
  }
  .logo .logo-sub {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-left: 6px;
    background: rgba(15, 207, 151, 0.12);
    padding: 2px 10px;
    border-radius: 999px;
    letter-spacing: .5px;
  }
  .nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
    margin-left: 48px;
  }
  .nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 2px;
    transition: color .2s;
  }
  .nav-links a:hover {
    color: var(--text-primary);
  }
  .nav-links a.active {
    color: var(--brand-primary);
    font-weight: 600;
  }
  .nav-links a.active::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    border-radius: 2px;
    background: var(--brand-primary);
  }
  .header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--brand-primary);
    color: #07130e;
    font-weight: 700;
    font-size: 15px;
    padding: 10px 22px;
    border-radius: var(--radius-btn);
    border: 1px solid transparent;
    transition: background .2s, transform .15s, box-shadow .2s;
    cursor: pointer;
    line-height: 1.4;
  }
  .btn-primary:hover {
    background-color: #17E0A5;
    box-shadow: 0 0 20px rgba(15, 207, 151, 0.35);
    transform: translateY(-1px);
  }
  .btn-primary:active {
    transform: scale(0.98);
  }
  .btn-primary:focus-visible {
    outline: 3px solid rgba(15, 207, 151, 0.5);
    outline-offset: 2px;
  }
  .btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--brand-primary);
    font-weight: 600;
    font-size: 15px;
    padding: 10px 22px;
    border-radius: var(--radius-btn);
    border: 1px solid rgba(15, 207, 151, 0.6);
    transition: all .2s;
    cursor: pointer;
  }
  .btn-outline:hover {
    background: rgba(15, 207, 151, 0.08);
    border-color: var(--brand-primary);
    box-shadow: 0 0 16px rgba(15, 207, 151, 0.2);
  }
  .btn-outline:active {
    transform: scale(0.98);
  }

  /* Hero */
  .hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
    background-color: var(--bg-primary);
  }
  .hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('/assets/images/backpic/back-1.png');
    background-size: cover;
    background-position: center;
  }
  .hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(11, 14, 12, 0.95) 0%, rgba(11, 14, 12, 0.55) 60%, transparent 100%);
  }
  .hero-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
    padding-top: 40px;
  }
  .hero-badge {
    display: inline-block;
    background: rgba(123, 108, 255, 0.18);
    color: #c5bdff;
    font-size: 13px;
    font-weight: 500;
    padding: 6px 14px;
    border-radius: 999px;
    margin-bottom: 20px;
    border: 1px solid rgba(123, 108, 255, 0.3);
    letter-spacing: .5px;
  }
  .hero h1 {
    font-size: 42px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: 1px;
    color: var(--text-primary);
  }
  .hero h1 .highlight {
    color: var(--brand-primary);
  }
  .hero-subtitle {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 520px;
    line-height: 1.8;
    margin-bottom: 32px;
  }
  .hero-ctas {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
  }
  .scroll-line {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    width: 2px;
    height: 42px;
    background: linear-gradient(to bottom, transparent, var(--brand-primary), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
  }
  @keyframes scrollPulse {
    0% {
      opacity: .3;
      transform: translateX(-50%) scaleY(.6);
    }
    50% {
      opacity: 1;
      transform: translateX(-50%) scaleY(1);
    }
    100% {
      opacity: .3;
      transform: translateX(-50%) scaleY(.6);
    }
  }

  /* sections */
  .section {
    padding: 80px 0;
  }
  .section-alt {
    background-color: #0d110f;
  }
  .section-title-wrap {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 36px;
    flex-wrap: wrap;
  }
  .section-title {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 1px;
    line-height: 1.3;
  }
  .section-title .section-en {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-top: 6px;
  }
  .section-link {
    font-size: 14px;
    color: var(--brand-primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap .2s;
  }
  .section-link:hover {
    gap: 8px;
  }

  /* scroll shelf */
  .shelf-wrap {
    position: relative;
  }
  .shelf-scroll {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 8px;
    scrollbar-width: none;
  }
  .shelf-scroll::-webkit-scrollbar {
    display: none;
  }
  .shelf-card {
    flex: 0 0 260px;
    scroll-snap-align: start;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: transform .2s, box-shadow .2s;
    box-shadow: var(--shadow-card);
  }
  .shelf-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
  }
  .shelf-card .cover {
    position: relative;
    height: 150px;
    overflow: hidden;
  }
  .shelf-card .cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .2s;
  }
  .shelf-card:hover .cover img {
    transform: scale(1.02);
  }
  .shelf-card .body {
    padding: 16px;
  }
  .shelf-card .body h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 6px;
  }
  .shelf-card .body p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
  }
  .shelf-arrow {
    position: absolute;
    right: 0;
    top: -70px;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid var(--border-light);
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all .2s;
    z-index: 5;
  }
  .shelf-arrow.prev {
    right: 48px;
  }
  .shelf-arrow:hover {
    color: var(--brand-primary);
    border-color: var(--brand-primary);
    background: rgba(15, 207, 151, 0.1);
  }

  /* badge */
  .badge {
    display: inline-flex;
    align-items: center;
    font-size: 12px;
    font-weight: 600;
    padding: 3px 12px;
    border-radius: 999px;
    letter-spacing: .3px;
    background: rgba(15, 207, 151, 0.14);
    color: var(--brand-primary);
  }
  .badge-alt {
    background: rgba(123, 108, 255, 0.18);
    color: #c5bdff;
  }
  .badge-warm {
    background: rgba(245, 184, 75, 0.16);
    color: var(--accent-warm);
  }

  /* recommendation cards */
  .feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }
  .feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: transform .25s, box-shadow .25s;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
  }
  .feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
  }
  .feature-card.large {
    grid-column: span 2;
  }
  .feature-card .cover {
    height: 190px;
    overflow: hidden;
    position: relative;
  }
  .feature-card.large .cover {
    height: 220px;
  }
  .feature-card .cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .3s;
  }
  .feature-card:hover .cover img {
    transform: scale(1.03);
  }
  .feature-card .cover-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(18, 25, 22, 0.8), transparent 60%);
  }
  .feature-card .body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
  }
  .feature-card .body .badge {
    align-self: flex-start;
    margin-bottom: 12px;
  }
  .feature-card .body h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
  }
  .feature-card .body p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 16px;
  }
  .feature-card .more-link {
    margin-top: auto;
    font-size: 14px;
    font-weight: 600;
    color: var(--brand-primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap .2s;
  }
  .feature-card .more-link:hover {
    gap: 8px;
  }

  /* playlist section */
  .playlist {
    border-top: 1px solid var(--border-light);
    padding-top: 56px;
    margin-top: 56px;
  }
  .playlist-num {
    font-size: 42px;
    font-weight: 800;
    line-height: 1;
    color: rgba(255, 255, 255, 0.12);
    margin-right: 20px;
    font-family: "SF Mono", "Consolas", monospace;
    tabular-nums: true;
  }
  .playlist-header {
    display: flex;
    align-items: center;
    margin-bottom: 28px;
  }
  .playlist-header h3 {
    font-size: 24px;
    font-weight: 700;
  }
  .playlist-header p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
  }
  .split-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
  }
  .split-block .img-wrap {
    border-radius: var(--radius-img);
    overflow: hidden;
    box-shadow: var(--shadow-card);
  }
  .split-block .img-wrap img {
    width: 100%;
    height: 300px;
    object-fit: cover;
  }
  .split-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .split-list-item {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    padding: 22px;
    transition: box-shadow .2s, transform .2s;
  }
  .split-list-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
  }
  .split-list-item .icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: rgba(15, 207, 151, 0.14);
    color: var(--brand-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    margin-bottom: 12px;
  }
  .split-list-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
  }
  .split-list-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
  }

  /* CTA */
  .cta-banner {
    position: relative;
    border-radius: 20px;
    padding: 56px 48px;
    background: radial-gradient(circle at 20% 30%, rgba(15, 207, 151, 0.16), transparent 50%),
      radial-gradient(circle at 80% 80%, rgba(123, 108, 255, 0.14), transparent 40%),
      linear-gradient(135deg, #08110c, #0B0E0C);
    border: 1px solid rgba(255, 255, 255, 0.06);
    overflow: hidden;
  }
  .cta-banner::before {
    content: '';
    position: absolute;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    background: rgba(15, 207, 151, 0.28);
    filter: blur(90px);
    top: -60px;
    right: -60px;
    pointer-events: none;
  }
  .cta-banner h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 12px;
  }
  .cta-banner p {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 560px;
    margin-bottom: 28px;
  }
  .cta-form {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    max-width: 640px;
  }
  .cta-form input {
    flex: 1 1 160px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color .2s, box-shadow .2s;
    outline: none;
  }
  .cta-form input::placeholder {
    color: var(--text-muted);
  }
  .cta-form input:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(15, 207, 151, 0.2);
  }

  /* news */
  .news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .news-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: transform .2s, box-shadow .2s;
    box-shadow: var(--shadow-card);
  }
  .news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
  }
  .news-card a {
    display: flex;
    flex-direction: column;
    height: 100%;
  }
  .news-card .cover {
    position: relative;
    height: 180px;
    overflow: hidden;
  }
  .news-card .cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .3s;
  }
  .news-card:hover .cover img {
    transform: scale(1.03);
  }
  .news-card .cover .badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(11, 14, 12, 0.75);
    backdrop-filter: blur(6px);
  }
  .news-card .body {
    padding: 18px 18px 14px;
    flex: 1;
    display: flex;
    flex-direction: column;
  }
  .news-card h3 {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .news-card .excerpt {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
    flex: 1;
  }
  .news-card .meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-light);
    padding-top: 12px;
  }
  .news-card .meta .read-more {
    color: var(--brand-primary);
    font-weight: 500;
  }
  .empty-state {
    grid-column: 1 / -1;
    background: var(--bg-card);
    border: 1px dashed var(--border-light);
    border-radius: var(--radius-card);
    padding: 60px 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 15px;
  }
  .empty-state .em {
    font-size: 36px;
    margin-bottom: 10px;
    display: block;
    opacity: .5;
  }

  /* FAQ */
  .faq-wrap {
    max-width: 860px;
    margin: 0 auto;
  }
  .faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    margin-bottom: 14px;
    overflow: hidden;
    transition: border-color .2s;
  }
  .faq-item.open {
    border-color: rgba(15, 207, 151, 0.3);
  }
  .faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 22px;
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: left;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    line-height: 1.5;
    transition: color .2s;
  }
  .faq-question:hover {
    color: var(--brand-primary);
  }
  .faq-question .icon {
    flex-shrink: 0;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: transform .3s, background .3s, border-color .3s;
    color: var(--text-secondary);
  }
  .faq-item.open .faq-question .icon {
    transform: rotate(45deg);
    background: rgba(15, 207, 151, 0.15);
    border-color: var(--brand-primary);
    color: var(--brand-primary);
  }
  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s ease, padding .3s ease;
    padding: 0 22px;
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
  }
  .faq-item.open .faq-answer {
    max-height: 300px;
    padding-bottom: 22px;
  }

  /* footer */
  .footer {
    background: #070907;
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-light);
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 40px;
    margin-bottom: 40px;
  }
  .footer-brand .logo {
    font-size: 22px;
    margin-bottom: 14px;
  }
  .footer-brand p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 280px;
  }
  .footer-col h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
  }
  .footer-col ul {
    list-style: none;
  }
  .footer-col li {
    margin-bottom: 10px;
  }
  .footer-col a {
    font-size: 14px;
    color: var(--text-secondary);
    transition: color .2s;
  }
  .footer-col a:hover {
    color: var(--brand-primary);
  }
  .footer-contact li {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    display: flex;
    align-items: flex-start;
    gap: 8px;
  }
  .footer-contact li svg {
    flex-shrink: 0;
    margin-top: 4px;
    color: var(--brand-primary);
  }
  .footer-bottom {
    border-top: 1px solid var(--border-light);
    padding-top: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
  }
  .footer-bottom a {
    color: var(--text-muted);
  }
  .footer-bottom a:hover {
    color: var(--brand-primary);
  }

  /* mobile bottom tab */
  .mobile-tab {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(11, 14, 12, 0.96);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-top: 1px solid var(--border-light);
    display: none;
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
    justify-content: space-around;
    align-items: center;
  }
  .mobile-tab a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    font-size: 11px;
    color: var(--text-muted);
    padding: 6px 12px;
    border-radius: 10px;
    transition: color .2s;
  }
  .mobile-tab a svg {
    width: 22px;
    height: 22px;
  }
  .mobile-tab a.active,
  .mobile-tab a:hover {
    color: var(--brand-primary);
  }

  @media (max-width: 1023px) {
    .nav-links,
    .header-actions .btn-primary {
      display: none;
    }
    .mobile-tab {
      display: flex;
    }
    .site-header {
      padding: 12px 0;
    }
    body {
      padding-bottom: 60px;
    }
    .section {
      padding: 56px 0;
    }
    .hero {
      min-height: 80vh;
      padding: 100px 0 60px;
    }
    .hero h1 {
      font-size: 34px;
    }
    .feature-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .news-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .split-block {
      grid-template-columns: 1fr;
      gap: 24px;
    }
    .footer-grid {
      grid-template-columns: 1fr 1fr;
    }
  }
  @media (max-width: 767px) {
    .feature-grid {
      grid-template-columns: 1fr;
    }
    .feature-card.large {
      grid-column: span 1;
    }
    .news-grid {
      grid-template-columns: 1fr;
    }
    .section-title {
      font-size: 22px;
    }
    .hero h1 {
      font-size: 30px;
    }
    .hero-subtitle {
      font-size: 15px;
    }
    .split-list {
      grid-template-columns: 1fr;
    }
    .footer-grid {
      grid-template-columns: 1fr;
      gap: 28px;
    }
    .cta-banner {
      padding: 36px 24px;
    }
    .cta-banner h2 {
      font-size: 22px;
    }
    .playlist-num {
      font-size: 30px;
      margin-right: 12px;
    }
    .playlist-header h3 {
      font-size: 20px;
    }
    .shelf-card {
      flex-basis: 240px;
    }
    .shelf-arrow {
      display: none;
    }
  }

/* roulang page: article */
:root {
    --bg-primary: #0B0E0C;
    --bg-card: #121916;
    --bg-card-hover: #16211C;
    --brand-primary: #0FCF97;
    --brand-primary-bright: #17E0A5;
    --brand-secondary: #7B6CFF;
    --accent-warm: #F5B84B;
    --text-primary: #E7EEEA;
    --text-secondary: #9AA8A0;
    --text-muted: #5A6660;
    --border-rgba: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(15, 207, 151, 0.3);
    --radius-card: 14px;
    --radius-btn: 10px;
    --radius-img: 12px;
    --radius-tag: 999px;
    --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.25);
    --shadow-hover: 0 0 0 1px rgba(15, 207, 151, 0.3), 0 16px 40px rgba(0, 0, 0, 0.4);
    --font-stack: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
    --space-section: 80px;
    --space-section-mobile: 56px;
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: var(--font-stack);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
  }

  a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
  }

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

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

  ul,
  ol {
    list-style-position: inside;
  }

  .container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
  }

  @media (min-width: 768px) {
    .container {
      padding: 0 24px;
    }
  }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background: rgba(11, 14, 12, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: background-color 0.3s ease, border-color 0.3s ease;
  }

  .site-header.scrolled {
    background: rgba(11, 14, 12, 0.98);
    border-bottom-color: var(--border-rgba);
  }

  .header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
    gap: 16px;
  }

  .header-left {
    display: flex;
    align-items: center;
    gap: 32px;
    min-width: 0;
  }

  .logo {
    display: inline-flex;
    align-items: baseline;
    font-weight: 800;
    font-size: 22px;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    white-space: nowrap;
  }

  .logo-mark {
    font-weight: 900;
    font-size: 24px;
    color: var(--brand-primary);
    text-transform: uppercase;
    letter-spacing: -1px;
  }

  .logo-sub {
    color: var(--text-muted);
    font-weight: 400;
    margin-left: 4px;
    font-size: 14px;
  }

  .nav-links {
    display: none;
    align-items: center;
    gap: 8px;
  }

  @media (min-width: 1024px) {
    .nav-links {
      display: flex;
    }
  }

  .nav-link {
    display: block;
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: color 0.2s ease, background-color 0.2s ease;
  }

  .nav-link:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
  }

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

  .header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    background: var(--brand-primary);
    color: #0B0E0C;
    font-size: 15px;
    font-weight: 700;
    border-radius: var(--radius-btn);
    cursor: pointer;
    transition: background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
    box-shadow: 0 2px 12px rgba(15, 207, 151, 0.25);
    white-space: nowrap;
  }

  .btn-primary:hover {
    background: var(--brand-primary-bright);
    box-shadow: 0 4px 20px rgba(15, 207, 151, 0.35);
  }

  .btn-primary:active {
    transform: scale(0.98);
  }

  .btn-primary:focus-visible {
    outline: 2px solid var(--brand-primary);
    outline-offset: 2px;
  }

  .btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    background: transparent;
    color: var(--brand-primary);
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-btn);
    border: 1px solid rgba(15, 207, 151, 0.5);
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
    white-space: nowrap;
  }

  .btn-outline:hover {
    background: rgba(15, 207, 151, 0.08);
    border-color: var(--brand-primary);
  }

  .btn-outline:active {
    transform: scale(0.98);
  }

  .btn-outline:focus-visible {
    outline: 2px solid var(--brand-primary);
    outline-offset: 2px;
  }

  .btn-lg {
    padding: 14px 32px;
    font-size: 16px;
  }

  .bottom-tab {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 60;
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: rgba(11, 14, 12, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border-rgba);
    padding-bottom: env(safe-area-inset-bottom);
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.3);
  }

  @media (min-width: 1024px) {
    .bottom-tab {
      display: none;
    }
  }

  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 10px 12px 8px;
    font-size: 12px;
    color: var(--text-muted);
    transition: color 0.2s ease;
    min-width: 56px;
  }

  .tab-item svg {
    width: 22px;
    height: 22px;
    stroke-width: 1.8;
  }

  .tab-item:hover {
    color: var(--text-secondary);
  }

  .tab-item.active {
    color: var(--brand-primary);
    font-weight: 600;
  }

  main {
    padding-bottom: 64px;
  }

  @media (min-width: 1024px) {
    main {
      padding-bottom: 0;
    }
  }

  .breadcrumb-wrap {
    padding-top: 96px;
    background: linear-gradient(180deg, rgba(15, 207, 151, 0.06), transparent);
  }

  @media (min-width: 1024px) {
    .breadcrumb-wrap {
      padding-top: 112px;
    }
  }

  .breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--text-muted);
    padding: 20px 0 12px;
  }

  .breadcrumb a {
    color: var(--text-secondary);
  }

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

  .breadcrumb .current {
    color: var(--text-primary);
    font-weight: 500;
    max-width: 280px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

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

  .article-section {
    padding: 24px 0 var(--space-section-mobile);
  }

  @media (min-width: 768px) {
    .article-section {
      padding: 32px 0 var(--space-section);
    }
  }

  .article-inner {
    max-width: 860px;
    margin: 0 auto;
  }

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

  .article-header h1 {
    font-size: 32px;
    font-weight: 800;
    line-height: 1.4;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
    color: var(--text-primary);
  }

  @media (min-width: 768px) {
    .article-header h1 {
      font-size: 38px;
    }
  }

  .article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px 24px;
    font-size: 14px;
    color: var(--text-muted);
  }

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

  .meta-item svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
  }

  .meta-item a {
    color: var(--brand-primary);
    font-weight: 500;
  }

  .meta-item a:hover {
    text-decoration: underline;
  }

  .article-content {
    font-size: 17px;
    line-height: 1.85;
    color: var(--text-primary);
  }

  .article-content h2 {
    font-size: 26px;
    font-weight: 700;
    margin: 36px 0 16px;
    color: var(--text-primary);
    line-height: 1.4;
  }

  .article-content h3 {
    font-size: 21px;
    font-weight: 600;
    margin: 28px 0 14px;
    color: var(--text-primary);
    line-height: 1.4;
  }

  .article-content h4 {
    font-size: 18px;
    font-weight: 600;
    margin: 24px 0 12px;
    color: var(--text-primary);
  }

  .article-content p {
    margin-bottom: 16px;
  }

  .article-content ul,
  .article-content ol {
    margin-bottom: 16px;
    padding-left: 8px;
  }

  .article-content ul li,
  .article-content ol li {
    margin-bottom: 8px;
    padding-left: 8px;
  }

  .article-content ul li::marker {
    color: var(--brand-primary);
  }

  .article-content ol li::marker {
    color: var(--brand-primary);
    font-weight: 600;
  }

  .article-content blockquote {
    margin: 24px 0;
    padding: 16px 24px;
    border-left: 4px solid var(--brand-primary);
    background: var(--bg-card);
    border-radius: 0 var(--radius-card) var(--radius-card) 0;
    color: var(--text-secondary);
    font-style: normal;
  }

  .article-content img {
    border-radius: var(--radius-img);
    margin: 24px 0;
    box-shadow: var(--shadow-card);
  }

  .article-content a {
    color: var(--brand-primary);
    border-bottom: 1px solid rgba(15, 207, 151, 0.3);
  }

  .article-content a:hover {
    border-bottom-color: var(--brand-primary);
  }

  .article-content code {
    background: rgba(15, 207, 151, 0.1);
    color: var(--brand-primary);
    padding: 2px 8px;
    border-radius: 6px;
    font-family: "SF Mono", "Consolas", monospace;
    font-size: 14px;
  }

  .article-content pre {
    background: var(--bg-card);
    padding: 20px;
    border-radius: var(--radius-card);
    overflow-x: auto;
    margin-bottom: 16px;
    border: 1px solid var(--border-rgba);
  }

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

  .article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 15px;
  }

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

  .article-content th {
    color: var(--brand-primary);
    font-weight: 600;
    background: rgba(15, 207, 151, 0.06);
  }

  .article-content td {
    color: var(--text-secondary);
  }

  .article-not-found {
    text-align: center;
    padding: 60px 24px;
    background: var(--bg-card);
    border-radius: var(--radius-card);
    border: 1px solid var(--border-rgba);
  }

  .article-not-found p {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
  }

  .related-section {
    padding: var(--space-section-mobile) 0;
    background: var(--bg-card);
    border-top: 1px solid var(--border-rgba);
    border-bottom: 1px solid var(--border-rgba);
  }

  @media (min-width: 768px) {
    .related-section {
      padding: var(--space-section) 0;
    }
  }

  .section-head {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 28px;
  }

  .section-head h2 {
    font-size: 26px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
  }

  .section-head p {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 6px;
  }

  .slide-arrows {
    display: none;
    gap: 10px;
  }

  @media (min-width: 1024px) {
    .slide-arrows {
      display: flex;
    }
  }

  .arrow-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-rgba);
    border-radius: 50%;
    color: var(--text-secondary);
    background: var(--bg-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 18px;
  }

  .arrow-btn:hover {
    color: var(--brand-primary);
    border-color: var(--border-hover);
    box-shadow: 0 0 12px rgba(15, 207, 151, 0.2);
  }

  .related-scroll {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 8px;
    scrollbar-width: none;
  }

  .related-scroll::-webkit-scrollbar {
    display: none;
  }

  .related-card {
    flex: 0 0 260px;
    scroll-snap-align: start;
    background: var(--bg-primary);
    border: 1px solid var(--border-rgba);
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
  }

  @media (min-width: 768px) {
    .related-card {
      flex-basis: 280px;
    }
  }

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

  .card-cover {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--bg-card);
  }

  .card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
  }

  .related-card:hover .card-cover img {
    transform: scale(1.02);
  }

  .card-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(15, 207, 151, 0.16);
    color: var(--brand-primary);
    font-size: 12px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: var(--radius-tag);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
  }

  .related-card h3 {
    font-size: 17px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
    padding: 16px 16px 8px;
    margin: 0;
  }

  .related-card p {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-secondary);
    padding: 0 16px 16px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin: 0;
  }

  .back-section {
    padding: 32px 0;
  }

  .back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s ease, transform 0.2s ease;
  }

  .back-link:hover {
    color: var(--brand-primary);
    transform: translateX(-4px);
  }

  .cta-section {
    padding: var(--space-section-mobile) 0;
    position: relative;
    overflow: hidden;
  }

  @media (min-width: 768px) {
    .cta-section {
      padding: var(--space-section) 0;
    }
  }

  .cta-inner {
    position: relative;
    background: radial-gradient(ellipse at center, rgba(15, 207, 151, 0.15) 0%, rgba(11, 14, 12, 0.4) 70%);
    border: 1px solid rgba(15, 207, 151, 0.2);
    border-radius: 20px;
    padding: 40px 28px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 24px;
  }

  @media (min-width: 768px) {
    .cta-inner {
      padding: 56px 48px;
      flex-direction: row;
      justify-content: space-between;
      text-align: left;
    }
  }

  .cta-inner::before {
    content: "";
    position: absolute;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    background: rgba(15, 207, 151, 0.12);
    filter: blur(60px);
    top: -80px;
    right: -80px;
    pointer-events: none;
  }

  .cta-content h2 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
  }

  @media (min-width: 768px) {
    .cta-content h2 {
      font-size: 30px;
    }
  }

  .cta-content p {
    font-size: 15px;
    color: var(--text-secondary);
    margin: 0;
  }

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

  .footer {
    background: #080a09;
    border-top: 1px solid var(--border-rgba);
    padding: 56px 0 0;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 36px;
    padding-bottom: 40px;
  }

  @media (min-width: 768px) {
    .footer-grid {
      grid-template-columns: 2fr 1fr 1fr 1.4fr;
      gap: 32px;
    }
  }

  .footer-brand .logo {
    margin-bottom: 16px;
  }

  .footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-muted);
    max-width: 320px;
  }

  .footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
  }

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

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

  .footer-col li a {
    font-size: 14px;
    color: var(--text-secondary);
    transition: color 0.2s ease;
  }

  .footer-col li a:hover {
    color: var(--brand-primary);
  }

  .footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
  }

  .footer-contact svg {
    flex-shrink: 0;
    margin-top: 4px;
    color: var(--brand-primary);
  }

  .footer-bottom {
    border-top: 1px solid var(--border-rgba);
    padding: 20px 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 10px;
    font-size: 13px;
    color: var(--text-muted);
  }

  .footer-bottom a {
    color: var(--text-muted);
  }

  .footer-bottom a:hover {
    color: var(--brand-primary);
  }

  @media (max-width: 520px) {
    .cta-actions .btn-lg {
      width: 100%;
    }
  }

/* roulang page: category1 */
:root {
  --bg: #0B0E0C;
  --bg-card: #121916;
  --primary: #0FCF97;
  --primary-hover: #17E0A5;
  --accent: #7B6CFF;
  --accent-soft: rgba(123,108,255,0.16);
  --amber: #F5B84B;
  --text-main: #E7EEEA;
  --text-muted: #9AA8A0;
  --text-weak: #5A6660;
  --border: rgba(255,255,255,0.08);
  --radius-card: 14px;
  --radius-btn: 10px;
  --radius-img: 12px;
  --radius-tag: 999px;
  --shadow-card: 0 8px 24px rgba(0,0,0,0.25);
  --shadow-hover: 0 0 0 1px rgba(15,207,151,0.3), 0 16px 40px rgba(0,0,0,0.4);
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text-main);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input { font-family: inherit; }
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
@media (max-width: 520px) {
  .container { padding-left: 16px; padding-right: 16px; }
}

/* Header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(11,14,12,0.72);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  transition: background .3s ease, box-shadow .3s ease;
}
.site-header.scrolled {
  background: rgba(11,14,12,0.94);
  box-shadow: 0 8px 30px rgba(0,0,0,0.35);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: inline-flex;
  align-items: baseline;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}
.logo .logo-mark {
  color: var(--primary);
  text-transform: uppercase;
  font-weight: 900;
  margin-right: 1px;
}
.logo .logo-sub {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 14px;
  margin-left: 4px;
}
.nav-links {
  display: flex;
  gap: 32px;
  margin-left: 48px;
}
.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 2px;
  position: relative;
  transition: color .2s ease;
}
.nav-links a:hover { color: var(--text-main); }
.nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 0; bottom: -2px;
  height: 2px; width: 100%;
  background: var(--primary);
  border-radius: 2px;
}
.header-actions { display: flex; align-items: center; gap: 16px; }
@media (max-width: 1023px) {
  .nav-links { display: none; }
  .header-inner { height: 64px; }
}

/* Mobile Tab Bar */
.mobile-tab-bar {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(11,14,12,0.96);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255,255,255,0.06);
}
.mobile-tab-bar .tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 10px 0 12px;
  color: var(--text-weak);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.2;
  transition: color .2s ease;
}
.mobile-tab-bar .tab-item svg { width: 20px; height: 20px; }
.mobile-tab-bar .tab-item.active { color: var(--primary); }
@media (max-width: 1023px) {
  .mobile-tab-bar { display: flex; }
  body { padding-bottom: 64px; }
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary);
  color: #06100A;
  font-weight: 700;
  font-size: 15px;
  padding: 10px 24px;
  border-radius: var(--radius-btn);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .2s ease, transform .1s ease, box-shadow .2s ease;
}
.btn-primary:hover { background: var(--primary-hover); box-shadow: 0 8px 24px rgba(15,207,151,0.25); }
.btn-primary:active, .btn-outline:active { transform: scale(0.98); }
.btn-primary:focus-visible, .btn-outline:focus-visible, input:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
  font-weight: 600;
  font-size: 15px;
  padding: 10px 24px;
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: background .2s ease, color .2s ease, transform .1s ease;
}
.btn-outline:hover { background: rgba(15,207,151,0.08); }
.btn-lg { padding: 14px 32px; font-size: 16px; }

/* Hero */
.solution-hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
}
.solution-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(11,14,12,0.96) 0%, rgba(11,14,12,0.62) 42%, rgba(11,14,12,0.28) 70%, rgba(11,14,12,0.55) 100%);
}
.solution-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(11,14,12,0.9) 0%, transparent 32%);
}
.hero-content {
  position: relative;
  z-index: 2;
  padding-top: 120px;
  padding-bottom: 100px;
}
.hero-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: rgba(15,207,151,0.12);
  border: 1px solid rgba(15,207,151,0.22);
  padding: 6px 14px;
  border-radius: var(--radius-tag);
  margin-bottom: 24px;
  letter-spacing: 0.04em;
}
.solution-hero h1 {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.solution-hero .hero-sub {
  font-size: 20px;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 0 36px;
  line-height: 1.7;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-scroll {
  position: absolute;
  bottom: 28px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.2em;
}
.hero-scroll::after {
  content: '';
  width: 1px; height: 48px;
  background: linear-gradient(to bottom, var(--primary), transparent);
}
@media (max-width: 768px) {
  .solution-hero h1 { font-size: 34px; }
  .solution-hero .hero-sub { font-size: 17px; }
}

/* Sections */
.section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.section-header {
  margin-bottom: 48px;
  max-width: 700px;
}
.section-header .eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.3;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}
.section-header p {
  color: var(--text-muted);
  font-size: 16px;
  margin: 0;
}
@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section-header h2 { font-size: 24px; }
}

/* Intro */
.intro-section {
  background: linear-gradient(180deg, var(--bg), #0E1410);
}
.intro-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  align-items: center;
}
.intro-text h2 {
  font-size: 28px;
  font-weight: 800;
  line-height: 1.3;
  margin: 0 0 20px;
}
.intro-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.9;
}
.intro-points {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
}
.intro-points li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-main);
  font-size: 15px;
}
.intro-points .point-icon {
  flex-shrink: 0;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: rgba(15,207,151,0.12);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
}
.intro-visual { position: relative; }
.intro-visual img {
  border-radius: var(--radius-img);
  box-shadow: var(--shadow-card);
}
.intro-visual .visual-badge {
  position: absolute;
  bottom: 20px; left: 20px;
  background: rgba(11,14,12,0.86);
  border: 1px solid rgba(15,207,151,0.3);
  border-radius: 12px;
  padding: 14px 18px;
  backdrop-filter: blur(8px);
}
.intro-visual .visual-badge strong {
  display: block;
  font-size: 18px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.3;
}
.intro-visual .visual-badge span {
  font-size: 13px;
  color: var(--text-muted);
}
@media (max-width: 1023px) {
  .intro-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* Solution cards */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.solution-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(15,207,151,0.3);
}
.solution-card .card-img {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.solution-card .card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s ease;
}
.solution-card:hover .card-img img { transform: scale(1.03); }
.solution-card .card-body { padding: 24px; }
.solution-card .card-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: var(--radius-tag);
  margin-bottom: 12px;
}
.solution-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 10px;
}
.solution-card p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}
.card-link:hover { color: var(--primary-hover); }
@media (max-width: 1279px) {
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .solution-grid { grid-template-columns: 1fr; }
}

/* Scene */
.scene-section { background: #0C110F; }
.scene-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.scene-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.scene-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}
.scene-index {
  font-size: 14px;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  padding-top: 2px;
}
.scene-list h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 6px;
}
.scene-list p {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0;
  line-height: 1.7;
}
.scene-visual img {
  border-radius: var(--radius-img);
  box-shadow: var(--shadow-card);
  width: 100%;
  object-fit: cover;
}
@media (max-width: 1023px) {
  .scene-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* Process */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.process-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  position: relative;
  transition: border-color .25s ease, transform .25s ease;
}
.process-step:hover {
  border-color: rgba(15,207,151,0.3);
  transform: translateY(-4px);
}
.process-step .step-num {
  font-size: 32px;
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--accent);
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}
.process-step h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 10px;
}
.process-step p {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0;
  line-height: 1.7;
}
@media (max-width: 1023px) {
  .process-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .process-grid { grid-template-columns: 1fr; }
}

/* Stats */
.stats-section {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.stat-item {
  text-align: center;
  padding: 20px 8px;
}
.stat-num {
  font-size: 44px;
  font-weight: 900;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.stat-label {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 10px;
}
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-num { font-size: 32px; }
}

/* FAQ */
.faq-section .container { max-width: 860px; }
.faq-list { margin-top: 40px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 16px;
  overflow: hidden;
  transition: border-color .25s ease;
}
.faq-item.open { border-color: rgba(15,207,151,0.35); }
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: transparent;
  border: 0;
  color: var(--text-main);
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: color .2s ease;
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  position: relative;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}
.faq-icon::before,
.faq-icon::after {
  content: '';
  position: absolute;
  background: var(--text-muted);
  border-radius: 2px;
  transition: background .2s ease, transform .3s ease;
}
.faq-icon::before { top: 9px; left: 2px; width: 16px; height: 2px; }
.faq-icon::after { top: 2px; left: 9px; width: 2px; height: 16px; }
.faq-item.open .faq-icon::after {
  transform: rotate(90deg);
  background: var(--primary);
}
.faq-item.open .faq-icon::before { background: var(--primary); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
}
.faq-item.open .faq-answer { max-height: 600px; }
.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.8;
}

/* CTA */
.cta-section {
  position: relative;
  background: radial-gradient(ellipse at 20% 30%, #0F4A3B 0%, #0B0E0C 60%);
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  right: -180px;
  top: -200px;
  background: radial-gradient(circle, rgba(15,207,151,0.28) 0%, transparent 70%);
}
.cta-section::after {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  left: -120px;
  bottom: -140px;
  background: radial-gradient(circle, rgba(123,108,255,0.22) 0%, transparent 70%);
}
.cta-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  padding: 80px 24px;
}
.cta-inner h2 {
  font-size: 34px;
  font-weight: 800;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}
.cta-inner .cta-sub {
  color: var(--text-muted);
  font-size: 16px;
  margin: 0 0 40px;
}
.cta-form {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  max-width: 580px;
  margin: 0 auto;
}
.cta-form input {
  flex: 1 1 180px;
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-btn);
  color: var(--text-main);
  font-size: 15px;
  padding: 12px 16px;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.cta-form input::placeholder { color: var(--text-weak); }
.cta-form input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15,207,151,0.12);
}
.cta-form input.input-error {
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(245,184,75,0.12);
}
.form-success {
  background: rgba(15,207,151,0.1);
  border: 1px solid rgba(15,207,151,0.35);
  color: var(--primary);
  border-radius: var(--radius-btn);
  padding: 16px 20px;
  font-size: 15px;
  max-width: 500px;
  margin: 0 auto;
}
@media (max-width: 768px) {
  .cta-inner h2 { font-size: 26px; }
  .cta-inner { padding: 56px 16px; }
}

/* Footer */
.footer {
  background: #080A09;
  border-top: 1px solid var(--border);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
  margin: 16px 0 0;
  max-width: 320px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 16px;
}
.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-col li { margin-bottom: 10px; }
.footer-col a {
  color: var(--text-muted);
  font-size: 14px;
  transition: color .2s ease;
}
.footer-col a:hover { color: var(--primary); }
.footer-contact li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 14px;
}
.footer-contact svg { color: var(--primary); flex-shrink: 0; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  color: var(--text-weak);
  font-size: 13px;
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }
@media (max-width: 1023px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer { padding: 48px 0 0; }
}