/* roulang page: index */
:root{
      --bg: #f8fafc;
      --card: #ffffff;
      --text: #0f172a;
      --muted: #64748b;
      --line: #e2e8f0;
      --brand: #2563eb;
      --brand2: #4f46e5;
      --accent: #f59e0b;
      --soft: #eef4ff;
      --soft2: #f3f6ff;
      --radius: 1.5rem;
      --radius-lg: 2rem;
      --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
      --shadow-hover: 0 24px 70px rgba(15, 23, 42, 0.12);
    }
    html { scroll-behavior: smooth; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at top left, rgba(37,99,235,0.08), transparent 28%),
        radial-gradient(circle at top right, rgba(79,70,229,0.07), transparent 24%),
        linear-gradient(180deg, #f8fbff 0%, #f8fafc 48%, #f8fafc 100%);
      min-height: 100vh;
    }
    body::before{
      content:"";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background-image:
        linear-gradient(rgba(148,163,184,0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148,163,184,0.06) 1px, transparent 1px);
      background-size: 36px 36px;
      opacity: .35;
      mask-image: linear-gradient(180deg, rgba(0,0,0,.28), rgba(0,0,0,0));
    }
    ::selection {
      background: rgba(37, 99, 235, 0.16);
      color: #0f172a;
    }
    a, button, input, textarea, summary {
      transition: all .22s ease;
    }
    a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible {
      outline: none;
      box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.18);
    }
    summary::-webkit-details-marker { display: none; }
    .soft-panel{
      background: linear-gradient(180deg, rgba(255,255,255,.88), rgba(255,255,255,.78));
      backdrop-filter: blur(10px);
      border: 1px solid rgba(226,232,240,.9);
      box-shadow: var(--shadow);
    }
    .section-gap { padding-top: 4.5rem; padding-bottom: 4.5rem; }
    @media (min-width: 1024px) {
      .section-gap { padding-top: 6rem; padding-bottom: 6rem; }
    }
    .card-hover {
      box-shadow: var(--shadow);
      transition: transform .24s ease, box-shadow .24s ease, border-color .24s ease, background-color .24s ease;
    }
    .card-hover:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }
    .subtle-glow {
      position: relative;
      overflow: hidden;
    }
    .subtle-glow::after{
      content:"";
      position:absolute;
      inset:-20% -10% auto auto;
      width: 16rem;
      height: 16rem;
      background: radial-gradient(circle, rgba(37,99,235,.14), rgba(37,99,235,0) 66%);
      pointer-events:none;
    }
    .btn-primary {
      background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
      color: #fff;
      box-shadow: 0 14px 28px rgba(37,99,235,.18);
    }
    .btn-primary:hover {
      filter: brightness(1.05);
      transform: translateY(-1px);
      box-shadow: 0 18px 36px rgba(37,99,235,.22);
    }
    .btn-secondary {
      background: #fff;
      color: #1d4ed8;
      border: 1px solid #cfe0ff;
    }
    .btn-secondary:hover {
      background: #eff6ff;
      transform: translateY(-1px);
      border-color: #93c5fd;
    }
    .tag {
      display: inline-flex;
      align-items: center;
      gap: .4rem;
      padding: .38rem .75rem;
      border-radius: 999px;
      font-size: .875rem;
      line-height: 1;
      font-weight: 600;
    }
    .tag-blue {
      background: #eff6ff;
      color: #1d4ed8;
      border: 1px solid #dbeafe;
    }
    .tag-amber {
      background: #fffbeb;
      color: #b45309;
      border: 1px solid #fde68a;
    }
    .chip {
      display: inline-flex;
      align-items: center;
      gap: .35rem;
      padding: .35rem .7rem;
      border-radius: 999px;
      font-size: .8rem;
      color: #475569;
      background: rgba(255,255,255,.75);
      border: 1px solid #e2e8f0;
    }
    .link-card {
      border: 1px solid rgba(191,219,254,.85);
      background: linear-gradient(180deg, #ffffff, #f8fbff);
    }
    .link-card:hover {
      border-color: rgba(96,165,250,.95);
      background: linear-gradient(180deg, #ffffff, #f4f8ff);
    }
    .list-dot {
      width: .65rem;
      height: .65rem;
      border-radius: 999px;
      background: linear-gradient(135deg, #2563eb, #4f46e5);
      box-shadow: 0 0 0 4px rgba(37,99,235,.10);
      flex: none;
      margin-top: .45rem;
    }
    .faq-item[open] .faq-arrow {
      transform: rotate(180deg);
    }

/* roulang page: category1 */
:root {
      --color-primary: #2563EB;
      --color-primary-2: #4F46E5;
      --color-amber: #F59E0B;
      --color-title: #111827;
      --color-text: #334155;
      --color-muted: #64748B;
      --color-border: #E2E8F0;
      --color-soft: #F8FAFC;
      --color-panel: #FFFFFF;
      --radius-sm: 0.75rem;
      --radius-md: 1rem;
      --radius-lg: 1.5rem;
      --radius-xl: 2rem;
      --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.08);
      --shadow-card: 0 10px 30px rgba(15, 23, 42, 0.06);
      --container: 80rem;
    }

    * {
      box-sizing: border-box;
    }

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

    body {
      margin: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
      color: var(--color-text);
      background:
        radial-gradient(circle at 12% 8%, rgba(37, 99, 235, 0.08), transparent 28rem),
        radial-gradient(circle at 88% 18%, rgba(79, 70, 229, 0.07), transparent 30rem),
        linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 46%, #F8FAFC 100%);
      line-height: 1.75;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color .22s ease, background-color .22s ease, border-color .22s ease, transform .22s ease, box-shadow .22s ease;
    }

    button,
    input,
    textarea,
    select {
      font: inherit;
    }

    button,
    summary {
      -webkit-tap-highlight-color: transparent;
    }

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

    ::selection {
      color: #fff;
      background: var(--color-primary);
    }

    :focus-visible {
      outline: 3px solid rgba(37, 99, 235, .28);
      outline-offset: 3px;
      border-radius: .75rem;
    }

    .site-shell {
      overflow: hidden;
      min-height: 100vh;
    }

    .section {
      padding: 5rem 0;
    }

    .section-tight {
      padding: 3.5rem 0;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--color-primary), var(--color-primary-2));
      color: #fff;
      box-shadow: 0 14px 30px rgba(37, 99, 235, 0.22);
      transition: transform .22s ease, box-shadow .22s ease, filter .22s ease;
    }

    .btn-primary:hover {
      transform: translateY(-1px);
      filter: brightness(1.04);
      box-shadow: 0 18px 42px rgba(37, 99, 235, 0.28);
    }

    .btn-primary:active {
      transform: translateY(0);
      box-shadow: 0 10px 20px rgba(37, 99, 235, 0.18);
    }

    .btn-secondary {
      color: #1D4ED8;
      background: #fff;
      border: 1px solid #BFDBFE;
      transition: transform .22s ease, box-shadow .22s ease, background-color .22s ease;
    }

    .btn-secondary:hover {
      background: #EFF6FF;
      transform: translateY(-1px);
      box-shadow: var(--shadow-card);
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: .45rem;
      border-radius: 999px;
      padding: .35rem .75rem;
      font-size: .875rem;
      font-weight: 700;
      line-height: 1.2;
    }

    .badge-blue {
      color: #1D4ED8;
      background: #EFF6FF;
      border: 1px solid #DBEAFE;
    }

    .badge-amber {
      color: #B45309;
      background: #FFFBEB;
      border: 1px solid #FDE68A;
    }

    .page-hero {
      position: relative;
      background:
        linear-gradient(135deg, rgba(239, 246, 255, .96), rgba(255, 255, 255, .96)),
        repeating-linear-gradient(90deg, rgba(37, 99, 235, .06) 0, rgba(37, 99, 235, .06) 1px, transparent 1px, transparent 36px);
    }

    .page-hero::before {
      content: "";
      position: absolute;
      inset: auto -8rem -10rem auto;
      width: 26rem;
      height: 26rem;
      border-radius: 999px;
      background: radial-gradient(circle, rgba(79, 70, 229, .16), transparent 68%);
      pointer-events: none;
    }

    .content-card {
      border: 1px solid rgba(226, 232, 240, .92);
      background: rgba(255,255,255,.96);
      box-shadow: var(--shadow-card);
      border-radius: var(--radius-lg);
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }

    .content-card:hover {
      transform: translateY(-3px);
      border-color: rgba(37, 99, 235, .28);
      box-shadow: var(--shadow-soft);
    }

    .filter-pill {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 999px;
      border: 1px solid #DBEAFE;
      background: #fff;
      color: #475569;
      padding: .7rem 1rem;
      font-size: .925rem;
      font-weight: 700;
      white-space: nowrap;
      transition: transform .22s ease, background-color .22s ease, color .22s ease, border-color .22s ease, box-shadow .22s ease;
    }

    .filter-pill:hover {
      color: #1D4ED8;
      background: #EFF6FF;
      transform: translateY(-1px);
      box-shadow: 0 10px 22px rgba(37, 99, 235, .08);
    }

    .filter-pill.is-active {
      color: #fff;
      border-color: transparent;
      background: linear-gradient(135deg, var(--color-primary), var(--color-primary-2));
      box-shadow: 0 14px 28px rgba(37, 99, 235, .2);
    }

    .sidebar-card {
      border-radius: var(--radius-lg);
      border: 1px solid rgba(226, 232, 240, .95);
      background: #fff;
      box-shadow: 0 12px 32px rgba(15, 23, 42, .05);
    }

    .sidebar-card.notice {
      border-color: #FDE68A;
      background: linear-gradient(180deg, #FFFBEB, #FFFFFF);
    }

    .step-line {
      position: relative;
    }

    .step-line::after {
      content: "";
      position: absolute;
      left: 1.55rem;
      top: 3.25rem;
      bottom: -1.25rem;
      width: 2px;
      background: linear-gradient(180deg, #BFDBFE, rgba(191,219,254,0));
    }

    .step-line:last-child::after {
      display: none;
    }

    .faq-card {
      border: 1px solid #E2E8F0;
      background: #fff;
      border-radius: 1.25rem;
      padding: 1.25rem;
      transition: border-color .22s ease, background-color .22s ease, transform .22s ease;
    }

    .faq-card:hover {
      border-color: #BFDBFE;
      background: #F8FBFF;
      transform: translateY(-2px);
    }

    .cta-panel {
      background:
        radial-gradient(circle at 20% 10%, rgba(255,255,255,.28), transparent 18rem),
        linear-gradient(135deg, #2563EB 0%, #4F46E5 100%);
      border-radius: 2rem;
      box-shadow: 0 28px 90px rgba(37, 99, 235, .26);
    }

    details[open] summary svg {
      transform: rotate(180deg);
    }

    details summary::-webkit-details-marker {
      display: none;
    }

    @media (max-width: 1024px) {
      .section {
        padding: 4rem 0;
      }

      .section-tight {
        padding: 3rem 0;
      }
    }

    @media (max-width: 768px) {
      body {
        background:
          radial-gradient(circle at 20% 5%, rgba(37, 99, 235, 0.09), transparent 22rem),
          linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 52%, #F8FAFC 100%);
      }

      .filter-scroll {
        overflow-x: auto;
        padding-bottom: .35rem;
        scrollbar-width: none;
      }

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

    @media (max-width: 520px) {
      .section {
        padding: 3rem 0;
      }

      .page-title {
        font-size: 2rem;
        line-height: 1.18;
      }

      .mobile-full {
        width: 100%;
      }
    }