/* roulang page: category1 */
:root {
    --c-bg: oklch(97% 0.005 250);
    --c-surface: oklch(100% 0 0);
    --c-border: oklch(90% 0.008 250);
    --c-text: oklch(18% 0.01 250);
    --c-muted: oklch(52% 0.012 250);
    --c-accent: oklch(52% 0.18 28);
    --c-accent-light: oklch(94% 0.04 28);
    --c-accent-dark: oklch(42% 0.18 28);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 4px oklch(0% 0 0 / 0.07);
    --shadow-md: 0 4px 16px oklch(0% 0 0 / 0.10);
    --shadow-lg: 0 8px 32px oklch(0% 0 0 / 0.13);
  }
  *, *::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: var(--c-bg);
    color: var(--c-text);
    line-height: 1.7;
    font-size: 16px;
  }
  a { color: inherit; text-decoration: none; }
  img { display: block; max-width: 100%; }
  button { cursor: pointer; font-family: inherit; }

  /* ── Container ── */
  .container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

  /* ── Header / Nav ── */
  .site-header {
    position: sticky; top: 0; z-index: 100;
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-sm);
  }
  .nav-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px; gap: 24px;
  }
  .nav-logo {
    font-size: 1.05rem; font-weight: 800; letter-spacing: -0.02em;
    color: var(--c-accent);
    white-space: nowrap;
    flex-shrink: 0;
  }
  .nav-links { display: flex; align-items: center; gap: 4px; }
  .nav-links a {
    padding: 6px 14px; border-radius: var(--radius-sm);
    font-size: 0.92rem; font-weight: 500; color: var(--c-muted);
    transition: background 0.18s, color 0.18s;
  }
  .nav-links a:hover { background: var(--c-accent-light); color: var(--c-accent); }
  .nav-links a.active { background: var(--c-accent-light); color: var(--c-accent); font-weight: 700; }
  .nav-cta {
    padding: 8px 20px; border-radius: var(--radius-sm);
    background: var(--c-accent); color: #fff; font-size: 0.9rem; font-weight: 700;
    border: none; transition: background 0.18s, transform 0.12s, box-shadow 0.18s;
    box-shadow: 0 2px 8px oklch(52% 0.18 28 / 0.25);
    white-space: nowrap;
  }
  .nav-cta:hover { background: var(--c-accent-dark); transform: translateY(-1px); box-shadow: 0 4px 14px oklch(52% 0.18 28 / 0.32); }
  .nav-cta:active { transform: translateY(0); }
  .nav-hamburger { display: none; background: none; border: none; padding: 6px; }
  .nav-hamburger span {
    display: block; width: 22px; height: 2px;
    background: var(--c-text); border-radius: 2px; margin: 5px 0;
    transition: transform 0.2s, opacity 0.2s;
  }
  .mobile-menu {
    display: none; flex-direction: column; gap: 4px;
    padding: 12px 24px 16px; border-top: 1px solid var(--c-border);
    background: var(--c-surface);
  }
  .mobile-menu.open { display: flex; }
  .mobile-menu a {
    padding: 10px 14px; border-radius: var(--radius-sm);
    font-size: 0.95rem; font-weight: 500; color: var(--c-muted);
    transition: background 0.15s, color 0.15s;
  }
  .mobile-menu a:hover, .mobile-menu a.active { background: var(--c-accent-light); color: var(--c-accent); }

  /* ── Breadcrumb ── */
  .breadcrumb {
    padding: 16px 0 0;
    font-size: 0.85rem; color: var(--c-muted);
    display: flex; align-items: center; gap: 6px;
  }
  .breadcrumb a { color: var(--c-accent); }
  .breadcrumb a:hover { text-decoration: underline; }

  /* ── Category Hero ── */
  .cat-hero {
    padding: 48px 0 40px;
    display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
  }
  .cat-hero-badge {
    display: inline-flex; align-items: center; gap: 6px;
    background: var(--c-accent-light); color: var(--c-accent);
    font-size: 0.8rem; font-weight: 700; padding: 4px 12px;
    border-radius: 999px; margin-bottom: 16px;
  }
  .cat-hero h1 {
    font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 900;
    line-height: 1.2; letter-spacing: -0.03em; margin-bottom: 16px;
  }
  .cat-hero h1 em { font-style: normal; color: var(--c-accent); }
  .cat-hero-desc { font-size: 1rem; color: var(--c-muted); line-height: 1.8; margin-bottom: 28px; }
  .cat-hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
  .btn-primary {
    padding: 12px 28px; border-radius: var(--radius-sm);
    background: var(--c-accent); color: #fff; font-size: 0.95rem; font-weight: 700;
    border: none; transition: background 0.18s, transform 0.12s, box-shadow 0.18s;
    box-shadow: 0 2px 10px oklch(52% 0.18 28 / 0.28);
  }
  .btn-primary:hover { background: var(--c-accent-dark); transform: translateY(-2px); box-shadow: 0 6px 18px oklch(52% 0.18 28 / 0.32); }
  .btn-primary:active { transform: translateY(0); }
  .btn-outline {
    padding: 12px 28px; border-radius: var(--radius-sm);
    background: transparent; color: var(--c-accent); font-size: 0.95rem; font-weight: 700;
    border: 2px solid var(--c-accent); transition: background 0.18s, color 0.18s;
  }
  .btn-outline:hover { background: var(--c-accent-light); }
  .cat-hero-panel {
    background: var(--c-surface); border-radius: var(--radius-lg);
    border: 1px solid var(--c-border); box-shadow: var(--shadow-md);
    padding: 28px; display: flex; flex-direction: column; gap: 16px;
  }
  .stat-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-card {
    background: var(--c-bg); border-radius: var(--radius-md);
    padding: 16px; text-align: center;
    border: 1px solid var(--c-border);
  }
  .stat-card .num { font-size: 1.7rem; font-weight: 900; color: var(--c-accent); line-height: 1; }
  .stat-card .label { font-size: 0.78rem; color: var(--c-muted); margin-top: 4px; }
  .trust-tags { display: flex; flex-wrap: wrap; gap: 8px; }
  .tag {
    display: inline-flex; align-items: center; gap: 4px;
    background: var(--c-accent-light); color: var(--c-accent);
    font-size: 0.78rem; font-weight: 600; padding: 4px 10px;
    border-radius: 999px;
  }

  /* ── Section ── */
  .section { padding: 56px 0; }
  .section-header { margin-bottom: 32px; }
  .section-label {
    font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em;
    color: var(--c-accent); text-transform: uppercase; margin-bottom: 8px;
  }
  .section-title { font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 800; letter-spacing: -0.02em; }
  .section-sub { font-size: 0.95rem; color: var(--c-muted); margin-top: 8px; }
  .divider { border: none; border-top: 1px solid var(--c-border); margin: 0; }

  /* ── Collection Grid ── */
  .collection-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  }
  .col-card {
    background: var(--c-surface); border-radius: var(--radius-md);
    border: 1px solid var(--c-border); overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex; flex-direction: column;
  }
  .col-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
  .col-card-cover {
    height: 140px;
    display: flex; align-items: center; justify-content: center;
    font-size: 2.4rem;
    position: relative; overflow: hidden;
  }
  .col-card-cover.c1 { background: linear-gradient(135deg, oklch(88% 0.08 28), oklch(94% 0.04 28)); }
  .col-card-cover.c2 { background: linear-gradient(135deg, oklch(88% 0.07 200), oklch(94% 0.03 200)); }
  .col-card-cover.c3 { background: linear-gradient(135deg, oklch(88% 0.07 280), oklch(94% 0.03 280)); }
  .col-card-cover.c4 { background: linear-gradient(135deg, oklch(88% 0.08 60), oklch(94% 0.04 60)); }
  .col-card-cover.c5 { background: linear-gradient(135deg, oklch(88% 0.07 150), oklch(94% 0.03 150)); }
  .col-card-cover.c6 { background: linear-gradient(135deg, oklch(88% 0.08 320), oklch(94% 0.04 320)); }
  .col-card-badge {
    position: absolute; top: 10px; right: 10px;
    background: var(--c-accent); color: #fff;
    font-size: 0.7rem; font-weight: 700; padding: 2px 8px; border-radius: 999px;
  }
  .col-card-body { padding: 16px; flex: 1; display: flex; flex-direction: column; gap: 8px; }
  .col-card-title { font-size: 1rem; font-weight: 700; line-height: 1.4; }
  .col-card-desc { font-size: 0.85rem; color: var(--c-muted); line-height: 1.6; flex: 1; }
  .col-card-meta { display: flex; align-items: center; justify-content: space-between; margin-top: 4px; }
  .col-card-count { font-size: 0.78rem; color: var(--c-muted); }
  .col-card-link {
    font-size: 0.8rem; font-weight: 700; color: var(--c-accent);
    display: flex; align-items: center; gap: 3px;
    transition: gap 0.15s;
  }
  .col-card:hover .col-card-link { gap: 6px; }

  /* ── Featured Strip ── */
  .featured-strip {
    background: linear-gradient(135deg, oklch(42% 0.18 28), oklch(52% 0.18 28));
    border-radius: var(--radius-lg); padding: 40px 48px;
    display: grid; grid-template-columns: 1fr auto; gap: 32px; align-items: center;
    color: #fff;
  }
  .featured-strip h2 { font-size: 1.5rem; font-weight: 800; margin-bottom: 8px; }
  .featured-strip p { font-size: 0.95rem; opacity: 0.85; }
  .btn-white {
    padding: 12px 28px; border-radius: var(--radius-sm);
    background: #fff; color: var(--c-accent); font-size: 0.95rem; font-weight: 700;
    border: none; white-space: nowrap;
    transition: transform 0.15s, box-shadow 0.15s;
    box-shadow: 0 2px 10px oklch(0% 0 0 / 0.15);
  }
  .btn-white:hover { transform: translateY(-2px); box-shadow: 0 6px 18px oklch(0% 0 0 / 0.2); }

  /* ── Process ── */
  .process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
  .process-step {
    background: var(--c-surface); border-radius: var(--radius-md);
    border: 1px solid var(--c-border); padding: 24px 20px;
    position: relative; text-align: center;
    box-shadow: var(--shadow-sm);
  }
  .step-num {
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--c-accent-light); color: var(--c-accent);
    font-size: 1rem; font-weight: 900;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 14px;
  }
  .process-step h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; }
  .process-step p { font-size: 0.83rem; color: var(--c-muted); line-height: 1.6; }

  /* ── Highlights ── */
  .highlights-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  .highlight-card {
    background: var(--c-surface); border-radius: var(--radius-md);
    border: 1px solid var(--c-border); padding: 24px;
    display: flex; gap: 16px; align-items: flex-start;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s;
  }
  .highlight-card:hover { box-shadow: var(--shadow-md); }
  .highlight-icon {
    width: 44px; height: 44px; border-radius: var(--radius-sm);
    background: var(--c-accent-light); color: var(--c-accent);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem; flex-shrink: 0;
  }
  .highlight-card h3 { font-size: 0.97rem; font-weight: 700; margin-bottom: 6px; }
  .highlight-card p { font-size: 0.85rem; color: var(--c-muted); line-height: 1.65; }

  /* ── FAQ ── */
  .faq-list { display: flex; flex-direction: column; gap: 12px; }
  .faq-item {
    background: var(--c-surface); border-radius: var(--radius-md);
    border: 1px solid var(--c-border); overflow: hidden;
    box-shadow: var(--shadow-sm);
  }
  .faq-q {
    width: 100%; text-align: left; padding: 18px 20px;
    background: none; border: none; font-size: 0.97rem; font-weight: 700;
    color: var(--c-text); display: flex; justify-content: space-between; align-items: center;
    gap: 12px; transition: background 0.15s;
  }
  .faq-q:hover { background: var(--c-bg); }
  .faq-q:focus-visible { outline: 2px solid var(--c-accent); outline-offset: -2px; }
  .faq-icon { font-size: 1.1rem; color: var(--c-accent); flex-shrink: 0; transition: transform 0.2s; }
  .faq-item.open .faq-icon { transform: rotate(45deg); }
  .faq-a {
    display: none; padding: 0 20px 18px;
    font-size: 0.9rem; color: var(--c-muted); line-height: 1.75;
    border-top: 1px solid var(--c-border);
  }
  .faq-item.open .faq-a { display: block; }

  /* ── CTA ── */
  .cta-section {
    background: var(--c-surface); border-radius: var(--radius-lg);
    border: 1px solid var(--c-border); padding: 56px 48px;
    text-align: center; box-shadow: var(--shadow-md);
  }
  .cta-section h2 { font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 900; margin-bottom: 12px; }
  .cta-section p { font-size: 1rem; color: var(--c-muted); margin-bottom: 28px; max-width: 520px; margin-left: auto; margin-right: auto; }
  .cta-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

  /* ── Footer ── */
  .site-footer {
    background: oklch(14% 0.01 250); color: oklch(70% 0.01 250);
    padding: 48px 0 24px; margin-top: 80px;
  }
  .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
  .footer-brand { font-size: 1rem; font-weight: 800; color: #fff; margin-bottom: 12px; }
  .footer-desc { font-size: 0.85rem; line-height: 1.7; }
  .footer-col h4 { font-size: 0.85rem; font-weight: 700; color: #fff; margin-bottom: 14px; }
  .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
  .footer-col ul li a { font-size: 0.85rem; transition: color 0.15s; }
  .footer-col ul li a:hover { color: var(--c-accent); }
  .footer-bottom {
    border-top: 1px solid oklch(25% 0.01 250);
    padding-top: 20px; display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: 8px; font-size: 0.8rem;
  }

  /* ── Responsive ── */
  @media (max-width: 1024px) {
    .collection-grid { grid-template-columns: repeat(2, 1fr); }
    .process-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
  }
  @media (max-width: 768px) {
    .cat-hero { grid-template-columns: 1fr; gap: 32px; }
    .cat-hero-panel { display: none; }
    .highlights-grid { grid-template-columns: 1fr; }
    .featured-strip { grid-template-columns: 1fr; text-align: center; padding: 32px 24px; }
    .nav-links, .nav-cta { display: none; }
    .nav-hamburger { display: block; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-bottom { flex-direction: column; text-align: center; }
  }
  @media (max-width: 520px) {
    .collection-grid { grid-template-columns: 1fr; }
    .process-grid { grid-template-columns: 1fr; }
    .stat-row { grid-template-columns: 1fr 1fr; }
    .cta-section { padding: 36px 20px; }
    .section { padding: 40px 0; }
  }