/* roulang page: index */
:root {
    --bg-base: oklch(97% 0.006 88);
    --surface: oklch(99.5% 0 0);
    --border: oklch(91% 0.008 88);
    --text-primary: oklch(22% 0.01 88);
    --text-muted: oklch(52% 0.01 88);
    --accent: oklch(54% 0.19 145);
    --accent-hover: oklch(46% 0.19 145);
    --accent-light: oklch(94% 0.06 145);
    --font-stack: 'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  }
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--font-stack);
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-size: 0.9375rem;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
  }
  a { color: inherit; text-decoration: none; }
  img { max-width: 100%; display: block; }
  button { cursor: pointer; font-family: inherit; }

  /* Container */
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
  }
  @media (max-width: 640px) { .container { padding: 0 1.5rem; } }

  /* Floating nav */
  .nav-float {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 50;
    width: calc(100% - 2rem);
    max-width: 56rem;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 9999px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
  }
  .nav-logo {
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--accent);
    white-space: nowrap;
    flex-shrink: 0;
  }
  .nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex: 1;
    justify-content: center;
  }
  .nav-links a {
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: color 150ms ease;
    white-space: nowrap;
  }
  .nav-links a:hover { color: var(--accent); }
  .nav-links a.active { color: var(--accent); font-weight: 600; }
  .nav-cta {
    background: var(--accent);
    color: #fff;
    border-radius: 9999px;
    padding: 0.375rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    transition: background 150ms ease;
    white-space: nowrap;
    flex-shrink: 0;
  }
  .nav-cta:hover { background: var(--accent-hover); }
  .nav-hamburger {
    display: none;
    background: none;
    border: none;
    padding: 0.25rem;
    color: var(--text-primary);
  }
  .nav-mobile-menu {
    display: none;
    position: fixed;
    top: 5rem;
    left: 1rem;
    right: 1rem;
    background: var(--surface);
    border-radius: 1rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    padding: 1.5rem;
    z-index: 49;
    flex-direction: column;
    gap: 1rem;
  }
  .nav-mobile-menu.open { display: flex; }
  .nav-mobile-menu a {
    font-size: 1rem;
    color: var(--text-primary);
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    transition: color 150ms ease;
  }
  .nav-mobile-menu a:last-child { border-bottom: none; }
  .nav-mobile-menu a:hover, .nav-mobile-menu a.active { color: var(--accent); font-weight: 600; }
  @media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-hamburger { display: block; }
  }

  /* Sections */
  section { padding: 5rem 0; }
  @media (max-width: 768px) { section { padding: 3rem 0; } }

  /* Section heading */
  .section-title {
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
  }
  .section-sub {
    font-size: 0.9375rem;
    color: var(--text-muted);
    margin-top: 0.75rem;
    max-width: 560px;
  }

  /* Badge */
  .badge {
    display: inline-flex;
    align-items: center;
    background: var(--accent-light);
    color: var(--accent);
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    letter-spacing: 0.01em;
  }

  /* Cards */
  .card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    transition: border-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  }
  .card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    transform: translateY(-2px);
  }

  /* Screenshot stage */
  .screenshot-stage {
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 20px 48px rgba(0,0,0,0.12), 0 0 0 1px var(--border);
    background: var(--surface);
  }

  /* Zone card */
  .zone-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    transition: border-color 150ms ease, transform 150ms ease;
    cursor: pointer;
  }
  .zone-card:hover { border-color: var(--accent); transform: translateY(-2px); }
  .zone-card .zone-icon { font-size: 1.5rem; }
  .zone-card .zone-name { font-weight: 600; font-size: 0.9375rem; color: var(--text-primary); }

  /* Buttons */
  .btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent);
    color: #fff;
    border-radius: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    font-size: 0.9375rem;
    border: none;
    transition: background 150ms ease, box-shadow 150ms ease;
    position: relative;
  }
  .btn-primary:hover { background: var(--accent-hover); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
  .btn-primary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
  .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: background 150ms ease;
  }
  .btn-secondary:hover { background: var(--accent-light); }

  /* Pulse dot */
  .pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #fff;
    position: relative;
    flex-shrink: 0;
  }
  .pulse-dot::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    animation: ping 1.5s cubic-bezier(0,0,0.2,1) infinite;
  }
  @keyframes ping {
    75%, 100% { transform: scale(2); opacity: 0; }
  }

  /* Hero */
  .hero { padding-top: 7rem; padding-bottom: 5rem; }
  @media (max-width: 768px) { .hero { padding-top: 6rem; padding-bottom: 3rem; } }
  .hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
  }
  @media (max-width: 1024px) { .hero-grid { gap: 2.5rem; } }
  @media (max-width: 768px) { .hero-grid { grid-template-columns: 1fr; gap: 2rem; } }
  .hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    line-height: 1.2;
    margin: 1rem 0 1.25rem;
  }
  .hero-desc {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.75;
    margin-bottom: 2rem;
    max-width: 480px;
  }
  .hero-actions { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
  .zone-matrix {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    padding: 1.25rem;
    background: var(--bg-base);
  }

  /* Steps */
  .steps-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr auto 1fr;
    gap: 0;
    align-items: start;
    margin-top: 3rem;
  }
  @media (max-width: 768px) {
    .steps-grid { grid-template-columns: 1fr; gap: 1.5rem; }
    .step-arrow { display: none; }
  }
  .step-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 2rem;
    color: var(--accent);
    font-size: 1.25rem;
  }
  .step-num {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 0.75rem;
  }

  /* Stats bar */
  .stats-bar {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    text-align: center;
    margin-top: 2.5rem;
  }
  @media (max-width: 640px) { .stats-bar { grid-template-columns: 1fr; } }
  .stat-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
  }
  .stat-label { font-size: 0.8125rem; color: var(--text-muted); margin-top: 0.25rem; }

  /* Testimonials */
  .testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
  }
  @media (max-width: 768px) { .testimonials-grid { grid-template-columns: 1fr; } }
  .avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--text-muted);
    flex-shrink: 0;
  }
  .stars { color: var(--accent); font-size: 0.875rem; letter-spacing: 0.05em; }

  /* Compare table */
  .compare-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
  }
  @media (max-width: 768px) { .compare-grid { grid-template-columns: 1fr; } }
  .compare-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: border-color 150ms ease, transform 150ms ease;
  }
  .compare-card:hover { border-color: var(--accent); transform: translateY(-2px); }
  .compare-card.featured { border-color: var(--accent); box-shadow: 0 4px 20px rgba(0,0,0,0.1); }
  .compare-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
  }
  .compare-header.featured-header { background: var(--accent); color: #fff; }
  .compare-body { padding: 1.5rem; }
  .compare-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    padding: 0.375rem 0;
    border-bottom: 1px solid var(--border);
  }
  .compare-item:last-child { border-bottom: none; }
  .check { color: var(--accent); font-weight: 700; }

  /* FAQ */
  .faq-list { margin-top: 2.5rem; border-top: 1px solid var(--border); }
  .faq-item { border-bottom: 1px solid var(--border); }
  .faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--text-primary);
    gap: 1rem;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    transition: color 150ms ease;
  }
  .faq-question:hover { color: var(--accent); }
  .faq-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    color: var(--accent);
    transition: transform 200ms ease;
  }
  .faq-item.open .faq-icon { transform: rotate(180deg); }
  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 250ms ease, padding 250ms ease;
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.75;
  }
  .faq-item.open .faq-answer { max-height: 200px; padding-bottom: 1.25rem; }

  /* CTA section */
  .cta-section {
    background: var(--accent-light);
    border-radius: 1.5rem;
    padding: 5rem 2rem;
    text-align: center;
  }
  @media (max-width: 768px) { .cta-section { padding: 3rem 1.5rem; } }
  .cta-section h2 {
    font-size: clamp(1.5rem, 3.5vw, 2.25rem);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
  }
  .cta-trust { font-size: 0.8125rem; color: var(--text-muted); margin-top: 1.25rem; }

  /* Lead form */
  .lead-form {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 2rem;
    max-width: 480px;
    margin: 0 auto;
  }
  .form-group { margin-bottom: 1rem; }
  .form-label { display: block; font-size: 0.875rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.375rem; }
  .form-input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-size: 0.9375rem;
    font-family: var(--font-stack);
    color: var(--text-primary);
    background: var(--bg-base);
    transition: border-color 150ms ease;
    outline: none;
  }
  .form-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,150,80,0.1); }
  .form-privacy { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.75rem; }

  /* Footer */
  footer {
    background: var(--text-primary);
    color: rgba(255,255,255,0.85);
    padding: 4rem 0 2rem;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }
  @media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; gap: 2rem; } }
  .footer-logo { font-weight: 700; font-size: 1rem; color: var(--accent); margin-bottom: 0.75rem; }
  .footer-desc { font-size: 0.875rem; color: rgba(255,255,255,0.6); line-height: 1.7; }
  .footer-heading { font-weight: 600; font-size: 0.875rem; color: #fff; margin-bottom: 1rem; }
  .footer-links { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
  .footer-links a { font-size: 0.875rem; color: rgba(255,255,255,0.6); transition: color 150ms ease; }
  .footer-links a:hover { color: var(--accent); }
  .footer-bottom {
    padding-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items-center; }
  @media (max-width: 640px) { .footer-bottom { flex-direction: column; gap: 0.75rem; text-align: center; } }
  .footer-copyright { font-size: 0.8125rem; color: rgba(255,255,255,0.45); }

  /* News list */
  .news-list { list-style: none; display: flex; flex-direction: column; gap: 0; }
  .news-item { border-bottom: 1px solid var(--border); }
  .news-item:last-child { border-bottom: none; }
  .news-link {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
    padding: 0.875rem 0;
    font-size: 0.9375rem;
    color: var(--text-primary);
    transition: color 150ms ease;
  }
  .news-link:hover { color: var(--accent); }
  .news-date { font-size: 0.8125rem; color: var(--text-muted); white-space: nowrap; flex-shrink: 0; }

  /* Viewpoint cards */
  .viewpoint-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
  }
  @media (max-width: 768px) { .viewpoint-grid { grid-template-columns: 1fr; } }
  .viewpoint-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.75rem;
    border-left: 4px solid var(--accent);
    transition: box-shadow 150ms ease, transform 150ms ease;
  }
  .viewpoint-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.08); transform: translateY(-2px); }
  .viewpoint-quote { font-size: 1.5rem; color: var(--accent); font-weight: 800; line-height: 1; margin-bottom: 0.75rem; }
  .viewpoint-text { font-size: 0.9375rem; color: var(--text-primary); line-height: 1.75; }
  .viewpoint-tag { display: inline-block; margin-top: 1rem; font-size: 0.75rem; color: var(--accent); font-weight: 600; }

  /* Sticky filter bar */
  .filter-bar {
    position: sticky;
    top: 4.5rem;
    z-index: 40;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0.875rem 0;
  }

/* roulang page: category2 */
:root {
    --bg-base: oklch(97% 0.006 88);
    --surface: oklch(99.5% 0 0);
    --border: oklch(91% 0.008 88);
    --text-primary: oklch(22% 0.01 88);
    --text-muted: oklch(52% 0.01 88);
    --accent: oklch(54% 0.19 145);
    --accent-hover: oklch(46% 0.19 145);
    --accent-light: oklch(94% 0.06 145);
  }
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: 'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-size: 0.9375rem;
    line-height: 1.75;
  }
  a { color: inherit; text-decoration: none; }
  img { display: block; max-width: 100%; }
  button { cursor: pointer; font-family: inherit; }

  /* NAV */
  .nav-float {
    position: fixed; top: 1rem; left: 50%; transform: translateX(-50%);
    z-index: 50; width: calc(100% - 2rem); max-width: 56rem;
    display: flex; align-items: center; gap: 1.5rem;
    background: rgba(255,255,255,0.85); backdrop-filter: blur(12px);
    border: 1px solid var(--border); border-radius: 9999px;
    padding: 0.625rem 1.5rem; box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  }
  .nav-logo {
    font-weight: 700; font-size: 0.9375rem; color: var(--accent);
    white-space: nowrap; flex-shrink: 0;
  }
  .nav-links {
    display: flex; align-items: center; gap: 1.25rem; flex: 1;
  }
  .nav-links a {
    font-size: 0.875rem; color: var(--text-primary);
    transition: color 150ms ease; white-space: nowrap;
  }
  .nav-links a:hover, .nav-links a.active {
    color: var(--accent);
  }
  .nav-links a.active { font-weight: 600; }
  .nav-cta {
    background: var(--accent); color: #fff;
    border-radius: 9999px; padding: 0.375rem 1rem;
    font-size: 0.875rem; font-weight: 600; white-space: nowrap;
    transition: background 150ms ease; flex-shrink: 0;
  }
  .nav-cta:hover { background: var(--accent-hover); }
  .nav-hamburger {
    display: none; background: none; border: none;
    color: var(--text-primary); padding: 0.25rem; margin-left: auto;
  }
  .mobile-menu {
    display: none; position: fixed; top: 4.5rem; left: 1rem; right: 1rem;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 1rem; box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    padding: 1rem; z-index: 49; flex-direction: column; gap: 0.25rem;
  }
  .mobile-menu.open { display: flex; }
  .mobile-menu a {
    padding: 0.625rem 0.75rem; border-radius: 0.5rem;
    font-size: 0.9375rem; color: var(--text-primary);
    transition: background 150ms ease;
  }
  .mobile-menu a:hover, .mobile-menu a.active {
    background: var(--accent-light); color: var(--accent);
  }
  .mobile-menu a.active { font-weight: 600; }

  /* CONTAINER */
  .container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
  @media (min-width: 1024px) { .container { padding: 0 2rem; } }

  /* HERO */
  .page-hero {
    padding: 7rem 0 3rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
  }
  .breadcrumb {
    display: flex; align-items: center; gap: 0.5rem;
    font-size: 0.8125rem; color: var(--text-muted); margin-bottom: 1.25rem;
  }
  .breadcrumb a:hover { color: var(--accent); }
  .breadcrumb span { color: var(--border); }
  .hero-inner {
    display: grid; grid-template-columns: 1fr auto;
    gap: 2rem; align-items: start;
  }
  .hero-h1 {
    font-size: clamp(1.5rem, 3.5vw, 2.25rem);
    font-weight: 700; letter-spacing: -0.02em;
    color: var(--text-primary); margin-bottom: 0.75rem;
  }
  .hero-sub {
    font-size: 0.9375rem; color: var(--text-muted);
    max-width: 36rem; line-height: 1.75;
  }
  .hero-tabs {
    display: flex; flex-direction: column; gap: 0.5rem;
    background: var(--bg-base); border: 1px solid var(--border);
    border-radius: 0.75rem; padding: 0.75rem; min-width: 9rem;
  }
  .hero-tab-btn {
    padding: 0.5rem 1rem; border-radius: 0.5rem;
    font-size: 0.875rem; font-weight: 600; border: none;
    background: transparent; color: var(--text-muted);
    transition: all 150ms ease; text-align: center;
  }
  .hero-tab-btn.active {
    background: var(--accent); color: #fff;
  }
  .hero-tab-btn:hover:not(.active) {
    background: var(--accent-light); color: var(--accent);
  }

  /* FILTER BAR */
  .filter-bar {
    position: sticky; top: 4.5rem; z-index: 30;
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
  }
  .filter-inner {
    display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap;
  }
  .filter-tab {
    padding: 0.375rem 1rem; border-radius: 9999px;
    font-size: 0.875rem; font-weight: 500; border: 1px solid var(--border);
    background: transparent; color: var(--text-muted);
    transition: all 150ms ease;
  }
  .filter-tab.active, .filter-tab:hover {
    background: var(--accent-light); color: var(--accent);
    border-color: var(--accent);
  }
  .filter-sort {
    margin-left: auto; padding: 0.375rem 0.75rem;
    border: 1px solid var(--border); border-radius: 0.5rem;
    font-size: 0.875rem; color: var(--text-muted);
    background: var(--surface); cursor: pointer;
  }

  /* MAIN LAYOUT */
  .main-layout {
    display: grid; grid-template-columns: 1fr 14rem;
    gap: 2rem; padding: 2.5rem 0 4rem;
  }
  @media (max-width: 1023px) {
    .main-layout { grid-template-columns: 1fr; }
    .sidebar { display: none; }
  }

  /* TAB PANELS */
  .tab-panels { position: relative; }
  .tab-panel {
    opacity: 0; transform: translateY(8px);
    transition: opacity 150ms ease, transform 150ms ease;
    pointer-events: none; position: absolute; top: 0; left: 0; right: 0;
  }
  .tab-panel.active {
    opacity: 1; transform: translateY(0);
    pointer-events: auto; position: relative;
  }
  .panel-tabs {
    display: flex; gap: 0.5rem; margin-bottom: 1.5rem;
  }
  .panel-tab-btn {
    padding: 0.5rem 1.25rem; border-radius: 0.5rem;
    font-size: 0.9375rem; font-weight: 600; border: 1px solid var(--border);
    background: transparent; color: var(--text-muted);
    transition: all 150ms ease;
  }
  .panel-tab-btn.active {
    background: var(--accent); color: #fff; border-color: var(--accent);
  }
  .panel-tab-btn:hover:not(.active) {
    background: var(--accent-light); color: var(--accent); border-color: var(--accent);
  }

  /* CARD GRID */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
  }
  @media (max-width: 1023px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 639px) { .card-grid { grid-template-columns: 1fr; } }

  .video-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 0.75rem; overflow: hidden;
    transition: border-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  }
  .video-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    transform: translateY(-2px);
  }
  .card-thumb {
    position: relative; aspect-ratio: 16/9;
    background: oklch(93% 0.005 88);
    border-radius: 0.5rem; overflow: hidden;
    margin: 0.625rem 0.625rem 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  }
  .card-thumb-inner {
    width: 100%; height: 100%;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, oklch(93% 0.008 145) 0%, oklch(90% 0.012 145) 100%);
  }
  .card-thumb-icon { font-size: 2rem; opacity: 0.4; }
  .card-badge {
    position: absolute; top: 0.5rem; left: 0.5rem;
    background: var(--accent-light); color: var(--accent);
    font-size: 0.6875rem; font-weight: 700; padding: 0.2rem 0.5rem;
    border-radius: 9999px;
  }
  .card-body { padding: 0.625rem 0.75rem 0.75rem; }
  .card-title {
    font-size: 0.875rem; font-weight: 600; color: var(--text-primary);
    line-height: 1.4; margin-bottom: 0.375rem;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .card-meta {
    font-size: 0.75rem; color: var(--text-muted);
    display: flex; gap: 0.5rem; margin-bottom: 0.625rem;
  }
  .card-cta {
    display: block; width: 100%; padding: 0.5rem;
    background: var(--accent); color: #fff; border: none;
    border-radius: 0.5rem; font-size: 0.8125rem; font-weight: 600;
    text-align: center; transition: background 150ms ease;
  }
  .card-cta:hover { background: var(--accent-hover); }

  /* MORE LINK */
  .more-link {
    display: inline-flex; align-items: center; gap: 0.375rem;
    margin-top: 1.25rem; font-size: 0.875rem; font-weight: 600;
    color: var(--accent); transition: gap 150ms ease;
  }
  .more-link:hover { gap: 0.625rem; }

  /* SIDEBAR */
  .sidebar { display: flex; flex-direction: column; gap: 1.25rem; }
  .sidebar-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 0.75rem; padding: 1rem;
  }
  .sidebar-title {
    font-size: 0.875rem; font-weight: 700; color: var(--text-primary);
    margin-bottom: 0.75rem; padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
  }
  .sidebar-list { display: flex; flex-direction: column; gap: 0.375rem; }
  .sidebar-list a {
    font-size: 0.8125rem; color: var(--text-muted);
    padding: 0.375rem 0.5rem; border-radius: 0.375rem;
    display: flex; align-items: center; gap: 0.5rem;
    transition: all 150ms ease;
  }
  .sidebar-list a:hover { background: var(--accent-light); color: var(--accent); }
  .sidebar-dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--accent); flex-shrink: 0;
  }

  /* CROSS BANNER */
  .cross-banner {
    background: var(--accent-light); border-radius: 1rem;
    padding: 1.5rem 2rem; margin-top: 2rem;
    display: flex; align-items: center; justify-content: space-between;
    gap: 1rem; flex-wrap: wrap;
  }
  .cross-banner-text { font-size: 0.9375rem; font-weight: 600; color: var(--text-primary); }
  .cross-banner-sub { font-size: 0.8125rem; color: var(--text-muted); margin-top: 0.25rem; }
  .btn-accent {
    background: var(--accent); color: #fff; border: none;
    border-radius: 0.5rem; padding: 0.625rem 1.25rem;
    font-size: 0.875rem; font-weight: 600;
    transition: background 150ms ease; white-space: nowrap;
  }
  .btn-accent:hover { background: var(--accent-hover); }

  /* FAQ */
  .faq-section { padding: 4rem 0; }
  .section-title {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 600; color: var(--text-primary);
    margin-bottom: 1.75rem;
  }
  .faq-item {
    border-bottom: 1px solid var(--border);
  }
  .faq-q {
    width: 100%; display: flex; justify-content: space-between; align-items: center;
    padding: 1rem 0; background: none; border: none;
    font-size: 0.9375rem; font-weight: 600; color: var(--text-primary);
    text-align: left; cursor: pointer; gap: 1rem;
    transition: color 150ms ease;
  }
  .faq-q:hover { color: var(--accent); }
  .faq-icon {
    flex-shrink: 0; width: 1.25rem; height: 1.25rem;
    color: var(--text-muted); transition: transform 150ms ease;
  }
  .faq-item.open .faq-icon { transform: rotate(180deg); }
  .faq-a {
    max-height: 0; overflow: hidden;
    transition: max-height 300ms ease, padding 300ms ease;
    font-size: 0.9rem; color: var(--text-muted); line-height: 1.75;
  }
  .faq-item.open .faq-a { max-height: 200px; padding-bottom: 1rem; }

  /* CTA SECTION */
  .cta-section {
    background: var(--accent-light); border-radius: 1.5rem;
    padding: 4rem 2rem; text-align: center; margin-bottom: 4rem;
  }
  .cta-title {
    font-size: clamp(1.25rem, 3vw, 1.875rem);
    font-weight: 700; color: var(--text-primary); margin-bottom: 0.75rem;
  }
  .cta-sub { font-size: 0.9375rem; color: var(--text-muted); margin-bottom: 1.75rem; }
  .cta-btns { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
  .btn-primary {
    position: relative; display: inline-flex; align-items: center; gap: 0.625rem;
    background: var(--accent); color: #fff; border: none;
    border-radius: 0.5rem; padding: 0.75rem 1.75rem;
    font-size: 1rem; font-weight: 700;
    transition: background 150ms ease;
  }
  .btn-primary:hover { background: var(--accent-hover); }
  .btn-secondary {
    display: inline-flex; align-items: center; gap: 0.375rem;
    border: 1.5px solid var(--accent); color: var(--accent);
    background: transparent; border-radius: 0.5rem;
    padding: 0.75rem 1.5rem; font-size: 1rem; font-weight: 600;
    transition: background 150ms ease;
  }
  .btn-secondary:hover { background: var(--accent-light); }
  .ping-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: #fff; animation: ping 1.5s cubic-bezier(0,0,0.2,1) infinite;
  }
  @keyframes ping {
    75%, 100% { transform: scale(2); opacity: 0; }
  }
  .cta-trust { font-size: 0.8125rem; color: var(--text-muted); margin-top: 1rem; }

  /* FOOTER */
  footer {
    background: var(--text-primary); color: rgba(255,255,255,0.85);
    padding: 3rem 0 1.5rem;
  }
  .footer-grid {
    display: grid; grid-template-columns: 1.5fr 1fr 1fr;
    gap: 2.5rem; margin-bottom: 2rem;
  }
  @media (max-width: 767px) { .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; } }
  .footer-logo { font-size: 1rem; font-weight: 700; color: var(--accent); margin-bottom: 0.75rem; }
  .footer-desc { font-size: 0.8125rem; color: rgba(255,255,255,0.5); line-height: 1.7; }
  .footer-heading { font-size: 0.875rem; font-weight: 700; color: #fff; margin-bottom: 0.75rem; }
  .footer-links { list-style: none; display: flex; flex-direction: column; gap: 0.375rem; }
  .footer-links a { font-size: 0.8125rem; color: rgba(255,255,255,0.55); transition: color 150ms ease; }
  .footer-links a:hover { color: var(--accent); }
  .footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 1.25rem;
    display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem;
  }
  .footer-copyright { font-size: 0.8125rem; color: rgba(255,255,255,0.35); }

  @media (max-width: 767px) {
    .hero-inner { grid-template-columns: 1fr; }
    .hero-tabs { flex-direction: row; min-width: unset; }
    .nav-links { display: none; }
    .nav-hamburger { display: flex; }
    .cross-banner { flex-direction: column; align-items: flex-start; }
    .cta-btns { flex-direction: column; align-items: center; }
    .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
  }

/* roulang page: category1 */
:root {
  --bg-base: oklch(97% 0.006 88);
  --surface: oklch(99.5% 0 0);
  --border: oklch(91% 0.008 88);
  --text-primary: oklch(22% 0.01 88);
  --text-muted: oklch(52% 0.01 88);
  --accent: oklch(54% 0.19 145);
  --accent-hover: oklch(46% 0.19 145);
  --accent-light: oklch(94% 0.06 145);
  --font: 'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg-base);color:var(--text-primary);font-size:0.9375rem;line-height:1.75}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{cursor:pointer;font-family:inherit}

/* NAV */
.nav-float{
  position:fixed;top:1rem;left:50%;transform:translateX(-50%);z-index:50;
  width:calc(100% - 2rem);max-width:56rem;
  display:flex;align-items:center;gap:1.5rem;
  background:rgba(255,255,255,0.85);backdrop-filter:blur(12px);
  border:1px solid var(--border);border-radius:9999px;
  padding:0.625rem 1.5rem;box-shadow:0 2px 12px rgba(0,0,0,0.08);
}
.nav-logo{font-weight:700;font-size:1rem;color:var(--accent);white-space:nowrap}
.nav-links{display:flex;align-items:center;gap:1.25rem;flex:1}
.nav-links a{font-size:0.875rem;color:var(--text-primary);transition:color 150ms}
.nav-links a:hover{color:var(--accent)}
.nav-links a.active{color:var(--accent);font-weight:600}
.nav-cta{
  background:var(--accent);color:#fff;border-radius:9999px;
  padding:0.375rem 1rem;font-size:0.875rem;font-weight:600;
  white-space:nowrap;transition:background 150ms;border:none;
}
.nav-cta:hover{background:var(--accent-hover)}
.nav-hamburger{display:none;background:none;border:none;color:var(--text-primary);padding:0.25rem}
.nav-mobile-menu{
  display:none;position:fixed;top:4.5rem;left:50%;transform:translateX(-50%);
  width:calc(100% - 2rem);max-width:56rem;z-index:49;
  background:#fff;border:1px solid var(--border);border-radius:1.25rem;
  box-shadow:0 8px 32px rgba(0,0,0,0.12);padding:1rem 1.5rem;
}
.nav-mobile-menu.open{display:block}
.nav-mobile-menu a{display:block;padding:0.625rem 0;font-size:0.9375rem;color:var(--text-primary);border-bottom:1px solid var(--border)}
.nav-mobile-menu a:last-child{border-bottom:none}
.nav-mobile-menu a.active{color:var(--accent);font-weight:600}

/* CONTAINER */
.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}
@media(min-width:1024px){.container{padding:0 2rem}}

/* HERO */
.page-hero{padding:7rem 0 3.5rem;background:var(--bg-base)}
.breadcrumb{display:flex;align-items:center;gap:0.5rem;font-size:0.8125rem;color:var(--text-muted);margin-bottom:1.5rem}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span{color:var(--text-muted)}
.hero-inner{display:grid;grid-template-columns:1fr auto;gap:2.5rem;align-items:start}
@media(max-width:767px){.hero-inner{grid-template-columns:1fr}}
.hero-badge{display:inline-flex;align-items:center;gap:0.375rem;background:var(--accent-light);color:var(--accent);border-radius:9999px;font-size:0.75rem;font-weight:600;padding:0.25rem 0.75rem;margin-bottom:1rem}
.hero-h1{font-size:clamp(1.6rem,4vw,2.4rem);font-weight:700;letter-spacing:-0.02em;color:var(--text-primary);line-height:1.25;margin-bottom:0.875rem}
.hero-sub{font-size:0.9375rem;color:var(--text-muted);max-width:520px;margin-bottom:1.75rem}
.tab-switch{display:flex;gap:0.5rem}
.tab-btn{
  padding:0.5rem 1.25rem;border-radius:0.5rem;font-size:0.875rem;font-weight:600;
  border:1.5px solid var(--border);background:var(--surface);color:var(--text-muted);
  transition:all 150ms;cursor:pointer;
}
.tab-btn.active,.tab-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent)}

/* FILTER BAR */
.filter-bar{
  position:sticky;top:4.5rem;z-index:30;
  background:var(--surface);border-bottom:1px solid var(--border);
  padding:0.875rem 0;
}
.filter-inner{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.filter-tab{
  padding:0.375rem 1rem;border-radius:9999px;font-size:0.875rem;font-weight:500;
  border:1.5px solid var(--border);background:transparent;color:var(--text-muted);
  transition:all 150ms;cursor:pointer;
}
.filter-tab.active,.filter-tab:hover{background:var(--accent);color:#fff;border-color:var(--accent)}
.filter-sort{
  margin-left:auto;padding:0.375rem 0.875rem;border-radius:0.5rem;
  border:1.5px solid var(--border);background:var(--surface);
  font-size:0.875rem;color:var(--text-primary);font-family:var(--font);cursor:pointer;
}

/* MAIN LAYOUT */
.main-layout{display:grid;grid-template-columns:1fr 280px;gap:2.5rem;padding:2.5rem 0 4rem}
@media(max-width:1023px){.main-layout{grid-template-columns:1fr}}
.sidebar{display:flex;flex-direction:column;gap:1.5rem}
@media(max-width:1023px){.sidebar{display:none}}

/* CARD GRID */
.card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem}
@media(max-width:1023px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:639px){.card-grid{grid-template-columns:1fr}}

/* CARD */
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:0.75rem;
  overflow:hidden;transition:border-color 150ms,transform 150ms,box-shadow 150ms;
}
.card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,0.1)}
.card-img-stage{
  position:relative;aspect-ratio:16/9;background:oklch(93% 0.005 88);
  border-radius:0.5rem;overflow:hidden;margin:0.75rem 0.75rem 0;
  box-shadow:0 2px 8px rgba(0,0,0,0.08);
}
.card-img-stage svg{position:absolute;inset:0;margin:auto}
.card-badge{
  position:absolute;top:0.5rem;left:0.5rem;
  background:var(--accent-light);color:var(--accent);
  font-size:0.6875rem;font-weight:700;padding:0.2rem 0.5rem;border-radius:9999px;
}
.card-body{padding:0.875rem}
.card-title{font-size:1rem;font-weight:600;color:var(--text-primary);line-height:1.4;margin-bottom:0.375rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{font-size:0.75rem;color:var(--text-muted);margin-bottom:0.75rem;display:flex;gap:0.5rem;align-items:center}
.card-tag{background:var(--accent-light);color:var(--accent);border-radius:9999px;padding:0.125rem 0.5rem;font-size:0.6875rem;font-weight:600}
.card-cta{
  display:block;width:100%;text-align:center;
  background:var(--accent);color:#fff;border-radius:0.5rem;
  padding:0.5rem;font-size:0.875rem;font-weight:600;
  border:none;transition:background 150ms;
}
.card-cta:hover{background:var(--accent-hover)}

/* SIDEBAR WIDGETS */
.widget{background:var(--surface);border:1px solid var(--border);border-radius:0.75rem;padding:1.25rem}
.widget-title{font-size:0.9375rem;font-weight:700;color:var(--text-primary);margin-bottom:1rem;padding-bottom:0.625rem;border-bottom:1px solid var(--border)}
.widget-list{display:flex;flex-direction:column;gap:0.5rem}
.widget-list a{
  display:flex;align-items:center;justify-content:space-between;
  font-size:0.875rem;color:var(--text-primary);padding:0.5rem 0.75rem;
  border-radius:0.5rem;transition:background 150ms;
}
.widget-list a:hover{background:var(--accent-light);color:var(--accent)}
.widget-list a span{font-size:0.75rem;color:var(--text-muted)}
.widget-new-item{padding:0.625rem 0;border-bottom:1px solid var(--border);font-size:0.875rem}
.widget-new-item:last-child{border-bottom:none;padding-bottom:0}
.widget-new-item .new-badge{display:inline-block;background:var(--accent-light);color:var(--accent);font-size:0.6875rem;font-weight:700;padding:0.1rem 0.4rem;border-radius:9999px;margin-right:0.375rem}

/* PAGINATION */
.pagination{display:flex;align-items:center;justify-content:center;gap:0.5rem;padding:2rem 0 1rem}
.page-btn{
  width:2.25rem;height:2.25rem;display:flex;align-items:center;justify-content:center;
  border-radius:0.5rem;border:1.5px solid var(--border);background:var(--surface);
  font-size:0.875rem;color:var(--text-primary);transition:all 150ms;cursor:pointer;
}
.page-btn:hover,.page-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.page-btn.prev,.page-btn.next{width:auto;padding:0 0.875rem;font-size:0.8125rem}

/* FOOTER */
footer{background:var(--text-primary);color:rgba(255,255,255,0.85);padding:3.5rem 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:2.5rem;padding-bottom:2.5rem}
@media(max-width:767px){.footer-grid{grid-template-columns:1fr}}
.footer-logo{font-size:1.125rem;font-weight:700;color:#fff;margin-bottom:0.75rem}
.footer-desc{font-size:0.8125rem;color:rgba(255,255,255,0.5);line-height:1.7}
.footer-heading{font-size:0.875rem;font-weight:700;color:#fff;margin-bottom:0.875rem}
.footer-links{list-style:none;display:flex;flex-direction:column;gap:0.5rem}
.footer-links a{font-size:0.8125rem;color:rgba(255,255,255,0.55);transition:color 150ms}
.footer-links a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding:1.25rem 0;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:0.5rem}
.footer-copyright{font-size:0.8125rem;color:rgba(255,255,255,0.35)}