/* roulang page: index */
:root {
      --c-graphite: #243036;
      --c-cavity: #12171A;
      --c-paper: #F3F1EC;
      --c-metal: #E7EBEE;
      --c-silver: #C5CDD3;
      --c-amber: #E4A35A;
      --c-tungsten: #E08A1E;
      --c-celadon: #2F8F86;
      --c-ink: #1A1F22;
      --c-mute: #5C666C;
      --c-mist: #F4F6F7;
      --grad: linear-gradient(135deg, #E08A1E 0%, #2F8F86 100%);
      --grad-soft: linear-gradient(135deg, rgba(224,138,30,.92), rgba(47,143,134,.88));
      --radius-card: 28px;
      --radius-btn: 999px;
      --radius-input: 14px;
      --shadow: 0 10px 24px rgba(18, 23, 26, .08);
      --shadow-hover: 0 14px 28px rgba(18, 23, 26, .12);
      --container: 1440px;
      --space-section: 104px;
      --nav-offset: 118px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--c-ink);
      background: var(--c-paper);
      line-height: 1.75;
      font-size: 16px;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font-family: inherit; }
    button { cursor: pointer; }
    h1, h2, h3 { line-height: 1.25; letter-spacing: .01em; color: var(--c-ink); }
    h1 { font-size: clamp(32px, 4vw, 52px); font-weight: 700; }
    h2 { font-size: clamp(26px, 3vw, 34px); font-weight: 700; }
    h3 { font-size: clamp(18px, 2vw, 22px); font-weight: 600; }
    .tabular { font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
    .container {
      width: min(100% - 40px, var(--container));
      margin-inline: auto;
    }
    .grad-text {
      background: var(--grad);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 80;
      background: var(--c-graphite);
      color: var(--c-mist);
      box-shadow: 0 8px 18px rgba(18,23,26,.08);
    }
    .tool-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      min-height: 36px;
      padding: 6px 0;
      font-size: 12px;
      color: #C5CDD3;
      border-bottom: 1px solid rgba(197,205,211,.16);
    }
    .tool-bar a:hover { color: #F4F6F7; }
    .brand-bar {
      display: grid;
      grid-template-columns: auto 1fr auto;
      align-items: center;
      gap: 24px;
      min-height: 82px;
      transition: min-height .25s ease;
    }
    .is-compact .brand-bar { min-height: 64px; }
    .logo-mark {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 18px;
      color: #F4F6F7;
      min-height: 44px;
    }
    .logo-badge {
      width: 34px; height: 34px; border-radius: 10px;
      background: var(--grad);
      display: grid; place-items: center;
      font-size: 12px; color: #12171A; font-weight: 700;
    }
    .nav-links { display: flex; justify-content: center; gap: 6px; flex-wrap: wrap; }
    .nav-links a {
      position: relative;
      padding: 10px 12px;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      color: #C5CDD3;
      font-size: 14px;
      font-weight: 500;
    }
    .nav-links a:hover { color: #F4F6F7; }
    .nav-links a.is-active { color: #F4F6F7; }
    .nav-links a.is-active::after,
    .nav-links a:hover::after {
      content: "";
      position: absolute;
      left: 12px; right: 12px; bottom: 6px;
      height: 2px;
      border-radius: 999px;
      background: var(--grad);
    }
    .btn {
      display: inline-flex; align-items: center; justify-content: center;
      gap: 8px; min-height: 44px; padding: 0 22px;
      border-radius: var(--radius-btn); border: 0;
      font-weight: 600; font-size: 14px;
      transition: transform .2s ease, filter .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .btn-primary {
      background: var(--grad);
      color: #12171A;
      box-shadow: var(--shadow);
    }
    .btn-primary:hover { filter: brightness(1.02); transform: translateY(-1px); }
    .btn-primary:active { transform: translateY(0); }
    .btn-ghost {
      background: transparent;
      color: #F4F6F7;
      border: 1px solid #C5CDD3;
    }
    .btn-ghost:hover { background: rgba(197,205,211,.08); }
    .btn-silver {
      background: #F4F6F7;
      color: var(--c-graphite);
      border: 1px solid #C5CDD3;
    }
    .btn-silver:hover { border-color: #2F8F86; color: #2F8F86; }
    .btn:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible, summary:focus-visible {
      outline: 2px solid #2F8F86;
      outline-offset: 3px;
    }
    .menu-toggle {
      display: none;
      width: 44px; height: 44px;
      border: 1px solid rgba(197,205,211,.3);
      border-radius: 12px;
      background: transparent;
      color: #F4F6F7;
    }
    .drawer {
      display: none;
      background: #1A2226;
      padding: 8px 0 18px;
    }
    .drawer a {
      display: flex; align-items: center;
      min-height: 44px; padding: 0 20px;
      color: #F4F6F7; border-bottom: 1px solid rgba(197,205,211,.08);
    }
    main { overflow: clip; }
    .section { padding: var(--space-section) 0; }
    .section-tight { padding: 72px 0; }
    .kicker {
      display: inline-flex; align-items: center; gap: 8px;
      font-size: 12px; letter-spacing: .18em; text-transform: uppercase;
      color: var(--c-celadon); font-weight: 600; margin-bottom: 10px;
    }
    .kicker::before {
      content: ""; width: 18px; height: 2px; border-radius: 999px; background: var(--grad);
    }
    .lead { color: var(--c-mute); max-width: 760px; }
    .badge {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 6px 12px; border-radius: 999px;
      background: rgba(243,241,236,.92);
      color: var(--c-ink); font-size: 12px; font-weight: 600;
      box-shadow: 0 6px 16px rgba(18,23,26,.06);
    }
    .badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--grad); }
    .badge-dark {
      background: rgba(18,23,26,.72);
      color: #F4F6F7;
      border: 1px solid rgba(197,205,211,.18);
    }
    .card {
      background: #fff;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow);
      border: 1px solid rgba(197,205,211,.5);
      transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(47,143,134,.45);
    }
    .hero {
      position: relative;
      min-height: calc(100vh - 118px);
      color: #F4F6F7;
      isolation: isolate;
    }
    .hero-slides { position: absolute; inset: 0; z-index: -2; }
    .hero-slide {
      position: absolute; inset: 0;
      background-size: cover; background-position: center;
      opacity: 0; transition: opacity .8s ease;
    }
    .hero-slide.is-on { opacity: 1; }
    .hero-mask {
      position: absolute; inset: 0; z-index: -1;
      background:
        linear-gradient(90deg, rgba(18,23,26,.82) 0%, rgba(36,48,54,.58) 48%, rgba(18,23,26,.35) 100%),
        linear-gradient(180deg, rgba(224,138,30,.18), rgba(47,143,134,.16));
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 32px;
      padding: 72px 0 88px;
      align-items: center;
    }
    .hero-copy p { color: #D7DEE2; max-width: 640px; }
    .compare-stack { display: grid; gap: 14px; }
    .tier {
      position: relative;
      border-radius: 24px;
      padding: 18px 18px 16px;
      background: rgba(18,23,26,.55);
      border: 1px solid rgba(197,205,211,.2);
      backdrop-filter: blur(8px);
    }
    .tier-rec {
      background: linear-gradient(180deg, rgba(224,138,30,.18), rgba(47,143,134,.16)), rgba(18,23,26,.72);
      border: 1px solid rgba(224,138,30,.55);
      box-shadow: 0 12px 28px rgba(18,23,26,.28);
      transform: translateY(-6px);
    }
    .tier-rec .rec-tag {
      position: absolute; top: -10px; right: 16px;
      background: var(--grad); color: #12171A;
      font-size: 11px; font-weight: 700; padding: 4px 10px; border-radius: 999px;
    }
    .dots { display: flex; gap: 8px; margin-top: 22px; }
    .dot-btn {
      width: 44px; height: 10px; border: 0; border-radius: 999px;
      background: rgba(244,246,247,.28);
    }
    .dot-btn.is-on { background: var(--grad); }
    .pain-strip { background: #fff; padding: 28px 0; border-block: 1px solid #E7EBEE; }
    .pain-row {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 14px;
    }
    .pain-chip {
      border-radius: 18px;
      padding: 16px 16px 14px;
      background: var(--c-paper);
      border: 1px solid #E7EBEE;
      min-height: 100%;
    }
    .pain-chip strong { display: block; margin-bottom: 6px; }
    .split {
      display: grid;
      grid-template-columns: 1.05fr .95fr;
      gap: 32px;
      align-items: center;
    }
    .cover-frame {
      border-radius: 32px;
      overflow: hidden;
      min-height: 460px;
      position: relative;
      box-shadow: var(--shadow);
    }
    .cover-frame img { width: 100%; height: 100%; object-fit: cover; min-height: 460px; }
    .bento {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr;
      grid-template-rows: auto auto;
      gap: 18px;
    }
    .bento .wide { grid-column: span 1; }
    .bento article:nth-child(1),
    .bento article:nth-child(2) { grid-column: span 1; min-height: 240px; }
    .bento article:nth-child(1) { grid-column: 1 / 2; grid-row: 1 / 3; }
    .cap-card { padding: 26px; min-height: 210px; display: flex; flex-direction: column; gap: 12px; }
    .icon-slab {
      width: 48px; height: 48px; border-radius: 16px;
      background: var(--c-metal); display: grid; place-items: center; font-weight: 700; color: var(--c-celadon);
    }
    .media-card {
      display: grid; grid-template-columns: .9fr 1.1fr; gap: 0; overflow: hidden;
    }
    .media-card.reverse { grid-template-columns: 1.1fr .9fr; }
    .media-card img { width: 100%; height: 100%; object-fit: cover; min-height: 320px; }
    .media-body { padding: 32px; }
    .param-bar {
      display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0;
    }
    .param-bar span {
      background: var(--c-paper); border: 1px solid #E7EBEE;
      border-radius: 999px; padding: 6px 12px; font-size: 12px; color: var(--c-mute);
    }
    .timeline { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; position: relative; }
    .step {
      padding: 22px; position: relative;
    }
    .step .num { font-size: 28px; font-weight: 700; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
    .dark-stage {
      background: var(--c-cavity);
      color: #F4F6F7;
      position: relative;
      overflow: hidden;
    }
    .dark-stage h2, .dark-stage h3 { color: #F4F6F7; }
    .dark-bg {
      position: absolute; inset: 0; background-size: cover; background-position: center;
      opacity: .28; filter: saturate(.7);
    }
    .dark-veil {
      position: absolute; inset: 0;
      background: linear-gradient(180deg, rgba(18,23,26,.75), rgba(36,48,54,.88)), linear-gradient(90deg, rgba(224,138,30,.12), rgba(47,143,134,.16));
    }
    .case-grid { position: relative; display: grid; grid-template-columns: 1.3fr .7fr; gap: 18px; }
    .case-side { display: grid; gap: 18px; }
    .stat-bar {
      background: linear-gradient(90deg, #1A2428, #243036);
      color: #F4F6F7;
      padding: 42px 0;
    }
    .stat-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
    .stat-item { text-align: left; padding: 8px 8px 8px 18px; border-left: 2px solid transparent; border-image: var(--grad) 1; }
    .stat-item .n { font-size: 34px; font-weight: 700; }
    .story { display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px; align-items: center; margin-bottom: 28px; }
    .story.alt { grid-template-columns: 1.1fr .9fr; }
    .story img { width: 100%; height: 320px; object-fit: cover; border-radius: 28px; }
    .quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .quote { padding: 26px; }
    .audience { display: grid; grid-template-columns: .8fr 1.2fr; gap: 28px; }
    .tags { display: flex; flex-wrap: wrap; gap: 8px; }
    .tag {
      border-radius: 999px; padding: 8px 14px; background: #fff; border: 1px solid #E7EBEE;
      font-size: 13px; color: var(--c-ink);
    }
    .tag:hover { border-color: #2F8F86; color: #2F8F86; }
    .scene-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr;
      grid-template-rows: 220px 220px;
      gap: 16px;
    }
    .scene {
      position: relative; overflow: hidden; border-radius: 28px; min-height: 220px; color: #F4F6F7;
    }
    .scene.big { grid-row: 1 / 3; min-height: 456px; }
    .scene img { width: 100%; height: 100%; object-fit: cover; }
    .scene figcaption {
      position: absolute; inset: auto 0 0 0; padding: 18px;
      background: linear-gradient(180deg, transparent, rgba(18,23,26,.82));
    }
    .spec-wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 28px; align-items: start; }
    table.specs {
      width: 100%; border-collapse: collapse; background: #fff;
      border-radius: 24px; overflow: hidden; box-shadow: var(--shadow);
    }
    table.specs th, table.specs td {
      padding: 14px 16px; text-align: left; border-bottom: 1px solid #E7EBEE; font-size: 14px;
    }
    table.specs th { width: 36%; color: var(--c-mute); font-weight: 500; background: #F8F6F2; }
    .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .news { padding: 22px; }
    .news time { color: var(--c-mute); font-size: 12px; }
    .dash { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .meter {
      height: 8px; border-radius: 999px; background: #E7EBEE; overflow: hidden; margin-top: 14px;
    }
    .meter span { display: block; height: 100%; background: var(--grad); }
    .faq-list { display: grid; gap: 10px; }
    details.faq {
      background: #fff; border-radius: 20px; padding: 4px 18px;
      border: 1px solid #E7EBEE; box-shadow: var(--shadow);
    }
    details.faq summary {
      cursor: pointer; font-weight: 700; min-height: 56px; display: flex; align-items: center; justify-content: space-between;
    }
    details.faq summary::-webkit-details-marker { display: none; }
    details.faq p { color: var(--c-mute); padding-bottom: 16px; }
    .cta-box {
      border-radius: 32px;
      padding: 42px;
      background: linear-gradient(135deg, #1A2428 0%, #243036 55%, #1E3333 100%);
      color: #F4F6F7;
      box-shadow: var(--shadow);
    }
    .cta-box h2 { color: #F4F6F7; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .form-grid .full { grid-column: 1 / -1; }
    label { display: block; font-size: 13px; margin-bottom: 6px; color: #C5CDD3; }
    input, select, textarea {
      width: 100%; min-height: 46px; border-radius: 14px;
      border: 1px solid rgba(197,205,211,.3);
      background: rgba(18,23,26,.35); color: #F4F6F7; padding: 10px 14px;
    }
    input::placeholder, textarea::placeholder { color: #8A949A; }
    .form-note { color: #C5CDD3; font-size: 13px; }
    .alert { border-radius: 14px; padding: 12px 14px; margin-bottom: 12px; }
    .alert.ok { background: rgba(47,143,134,.18); color: #D6F3EF; }
    .alert.err { background: rgba(224,138,30,.18); color: #F8E2C4; }
    .site-footer {
      background: var(--c-graphite); color: #C5CDD3; padding: 64px 0 28px;
    }
    .foot-grid { display: grid; grid-template-columns: 1.3fr .8fr 1fr .9fr; gap: 28px; }
    .site-footer a:hover { color: #F4F6F7; }
    .copy { margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(197,205,211,.14); font-size: 13px; }
    .orbit {
      position: absolute; width: 240px; height: 240px; border: 1px dashed rgba(197,205,211,.25); border-radius: 50%;
      right: 8%; top: 18%; pointer-events: none;
    }
    @media (max-width: 1440px) {
      .container { width: min(100% - 32px, 1200px); }
    }
    @media (max-width: 1024px) {
      :root { --space-section: 84px; }
      .hero-grid, .split, .case-grid, .audience, .spec-wrap, .story, .story.alt { grid-template-columns: 1fr; }
      .media-card, .media-card.reverse { grid-template-columns: 1fr; }
      .bento { grid-template-columns: 1fr 1fr; }
      .bento article:nth-child(1) { grid-column: 1 / -1; grid-row: auto; }
      .pain-row, .timeline, .stat-row, .news-grid { grid-template-columns: 1fr 1fr; }
      .quote-grid { grid-template-columns: 1fr; }
      .scene-grid { grid-template-columns: 1fr 1fr; grid-template-rows: 220px 220px 220px; }
      .scene.big { grid-column: 1 / -1; grid-row: auto; min-height: 280px; }
      .foot-grid { grid-template-columns: 1fr 1fr; }
      .nav-links { display: none; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .brand-bar { grid-template-columns: 1fr auto auto; }
    }
    @media (max-width: 768px) {
      :root { --space-section: 72px; --nav-offset: 96px; }
      .tool-meta { display: none; }
      .hero-grid { padding: 42px 0 56px; }
      .tier-rec { transform: none; }
      .bento, .dash, .form-grid, .pain-row, .timeline, .stat-row, .news-grid { grid-template-columns: 1fr; }
      .cta-box { padding: 24px; }
      .cover-frame, .cover-frame img { min-height: 280px; }
      .foot-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 520px) {
      .container { width: min(100% - 24px, 100%); }
      h1 { font-size: 30px; }
      .hero { min-height: auto; }
      .orbit { display: none; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { transition: none !important; animation: none !important; }
    }