/* roulang page: index */
:root {
      --bg-0: #070B14;
      --bg-1: #0C1630;
      --bg-2: #101C3A;
      --primary: #1E4ED8;
      --primary-2: #3B82F6;
      --glass: rgba(16, 28, 58, .55);
      --glass-2: rgba(12, 22, 48, .72);
      --line: rgba(147, 197, 253, .28);
      --line-strong: rgba(147, 197, 253, .45);
      --accent-warm: #C4A574;
      --accent-marble: #E8E2D6;
      --text: #E8EEF9;
      --muted: #9AA8C2;
      --danger-soft: #F0A36B;
      --ok: #7dd3a8;
      --radius: 20px;
      --radius-s: 12px;
      --shadow: 0 18px 48px rgba(30, 78, 216, .22);
      --glow: 0 0 24px rgba(59, 130, 246, .45);
      --space: 24px;
      --header-h: 118px;
      --max: 1200px;
    }
    *, *::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;
      background: var(--bg-0);
      color: var(--text);
      font-size: 16px;
      line-height: 1.75;
      letter-spacing: .02em;
      overflow-x: hidden;
    }
    img { max-width: 100%; display: block; height: auto; }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font-family: inherit; }
    button { cursor: pointer; }
    h1, h2, h3 { margin: 0 0 16px; line-height: 1.28; font-weight: 700; }
    h1 { font-size: clamp(32px, 4.6vw, 54px); }
    h2 { font-size: clamp(26px, 3vw, 34px); }
    h3 { font-size: 22px; }
    p { margin: 0 0 16px; color: var(--muted); }
    p:last-child { margin-bottom: 0; }
    ul { margin: 0; padding: 0; list-style: none; }
    .serif { font-family: "Noto Serif SC", "Source Han Serif SC", serif; color: var(--accent-marble); }
    .container { width: min(100% - 40px, var(--max)); margin: 0 auto; }
    .skip {
      position: absolute; left: -999px; top: 8px;
      background: var(--primary); color: #fff; padding: 10px 16px; border-radius: 8px; z-index: 100;
    }
    .skip:focus { left: 12px; }
    .grid-bg {
      background-image:
        linear-gradient(rgba(147,197,253,.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(147,197,253,.06) 1px, transparent 1px);
      background-size: 48px 48px;
    }
    .site-header {
      position: sticky; top: 0; z-index: 80;
      background: rgba(7, 11, 20, .62);
      backdrop-filter: blur(16px) saturate(140%);
      -webkit-backdrop-filter: blur(16px) saturate(140%);
      border-bottom: 1px solid var(--line);
      box-shadow: 0 10px 30px rgba(0,0,0,.25), inset 0 -1px 0 rgba(59,130,246,.35);
      transition: background .25s ease, box-shadow .25s ease;
    }
    .site-header.is-scrolled { background: rgba(7, 11, 20, .88); }
    .nav-top, .nav-sub {
      display: flex; align-items: center; justify-content: space-between; gap: 16px;
    }
    .nav-top { min-height: 68px; padding: 8px 0; }
    .nav-sub { min-height: 50px; border-top: 1px solid rgba(147,197,253,.14); }
    .logo {
      display: flex; align-items: center; gap: 10px; min-height: 44px;
      font-weight: 700; font-size: 18px; letter-spacing: .04em;
    }
    .logo-mark {
      width: 36px; height: 36px; border-radius: 10px;
      background: linear-gradient(145deg, #3B82F6, #1E4ED8);
      box-shadow: var(--glow);
      position: relative;
    }
    .logo-mark::after {
      content: ""; position: absolute; inset: 8px 7px 10px;
      border: 1.5px solid rgba(232,226,214,.85); border-radius: 3px;
    }
    .logo small { display: block; font-size: 12px; color: var(--muted); font-weight: 400; }
    .nav-contact { display: flex; align-items: center; gap: 18px; color: var(--muted); font-size: 14px; }
    .nav-contact a { min-height: 44px; display: inline-flex; align-items: center; }
    .nav-contact a:hover { color: var(--accent-marble); }
    .nav-links { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; width: 100%; }
    .nav-links::-webkit-scrollbar { display: none; }
    .nav-links a {
      min-height: 44px; padding: 8px 14px; display: inline-flex; align-items: center;
      color: var(--muted); font-size: 14px; white-space: nowrap; border-radius: 999px;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.is-active { color: var(--text); }
    .nav-links a.is-active::after {
      content: ""; position: absolute; left: 14px; right: 14px; bottom: 6px; height: 2px;
      background: linear-gradient(90deg, transparent, var(--primary-2), transparent);
      box-shadow: 0 0 8px var(--primary-2);
    }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 44px; padding: 10px 20px; border-radius: 999px; border: 1px solid transparent;
      font-size: 15px; font-weight: 600; color: #fff; position: relative; overflow: hidden;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
    }
    .btn-primary {
      background: linear-gradient(180deg, #3B82F6, #1E4ED8);
      box-shadow: var(--glow);
    }
    .btn-primary::before {
      content: ""; position: absolute; inset: 0;
      background: linear-gradient(120deg, transparent 20%, rgba(255,255,255,.28) 45%, transparent 70%);
      transform: translateX(-120%); transition: transform .55s ease;
    }
    .btn-primary:hover { transform: translateY(-1px); box-shadow: 0 0 28px rgba(59,130,246,.7); }
    .btn-primary:hover::before { transform: translateX(120%); }
    .btn-primary:active { transform: translateY(0) scale(.98); }
    .btn-ghost {
      background: rgba(16,28,58,.45); border-color: var(--line); color: var(--text);
      backdrop-filter: blur(12px);
    }
    .btn-ghost:hover { border-color: var(--primary-2); box-shadow: 0 0 18px rgba(59,130,246,.25); }
    .btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
      outline: 2px solid var(--primary-2); outline-offset: 3px;
    }
    .menu-toggle {
      display: none; width: 44px; height: 44px; border-radius: 12px;
      border: 1px solid var(--line); background: var(--glass); color: var(--text);
    }
    .menu-toggle span, .menu-toggle span::before, .menu-toggle span::after {
      display: block; width: 18px; height: 2px; background: var(--text); position: relative; margin: 0 auto;
    }
    .menu-toggle span::before, .menu-toggle span::after {
      content: ""; position: absolute; left: 0;
    }
    .menu-toggle span::before { top: -6px; }
    .menu-toggle span::after { top: 6px; }
    main { display: block; }
    section { position: relative; padding: 104px 0; }
    .sec-head { max-width: 760px; margin-bottom: 36px; }
    .sec-head p { max-width: 42em; }
    .kicker {
      display: inline-flex; align-items: center; gap: 8px;
      color: var(--accent-warm); font-size: 13px; letter-spacing: .18em; margin-bottom: 12px;
      text-transform: none;
    }
    .kicker::before { content: ""; width: 28px; height: 1px; background: var(--accent-warm); }
    .badge {
      display: inline-flex; align-items: center; min-height: 28px; padding: 4px 10px;
      border: 1px solid var(--line); border-radius: 999px; font-size: 12px; color: var(--accent-marble);
      background: rgba(30,78,216,.18);
    }
    .swatch {
      display: flex; height: 6px; border-radius: 999px; overflow: hidden; margin-bottom: 14px;
    }
    .swatch i { flex: 1; display: block; }
    .glass-card {
      background: var(--glass);
      backdrop-filter: blur(16px) saturate(140%);
      -webkit-backdrop-filter: blur(16px) saturate(140%);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: var(--shadow), inset 0 1px 0 rgba(255,255,255,.16);
      padding: 22px;
      transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
    }
    .glass-card:hover {
      transform: translateY(-4px);
      border-color: var(--line-strong);
      box-shadow: 0 20px 40px rgba(30,78,216,.28), inset 0 1px 0 rgba(255,255,255,.22);
    }
    .hero {
      padding: 0; min-height: calc(100vh - var(--header-h));
      display: flex; align-items: stretch;
    }
    .hero-slider { position: relative; width: 100%; min-height: 680px; overflow: hidden; }
    .slide {
      position: absolute; inset: 0; opacity: 0; visibility: hidden;
      transition: opacity .8s ease, visibility .8s ease;
    }
    .slide.is-on { opacity: 1; visibility: visible; z-index: 1; }
    .slide img {
      width: 100%; height: 100%; object-fit: cover; filter: saturate(0.92) contrast(1.05);
    }
    .slide::after {
      content: ""; position: absolute; inset: 0;
      background:
        radial-gradient(circle at 18% 28%, rgba(30,78,216,.28), transparent 36%),
        linear-gradient(90deg, rgba(7,11,20,.88) 8%, rgba(7,11,20,.55) 46%, rgba(7,11,20,.78) 100%),
        linear-gradient(180deg, rgba(7,11,20,.2), rgba(7,11,20,.7));
    }
    .hero-content {
      position: relative; z-index: 3; width: min(100% - 40px, var(--max)); margin: 0 auto;
      min-height: 680px; display: grid; grid-template-columns: 1.15fr .85fr; gap: 36px; align-items: center;
      padding: 56px 0 72px;
    }
    .hero-copy h1 { margin-bottom: 18px; }
    .hero-lead { color: var(--text); font-size: 16px; max-width: 40em; margin-bottom: 22px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 18px; }
    .hero-note { font-size: 13px; color: var(--muted); }
    .space-chip {
      position: absolute; right: 0; bottom: 28px; z-index: 4;
      background: var(--glass-2); border: 1px solid var(--line); border-radius: 14px;
      padding: 10px 14px; font-size: 13px; backdrop-filter: blur(16px);
    }
    .space-chip b { color: var(--accent-warm); font-weight: 600; }
    .hero-form {
      position: relative; z-index: 3;
      background: rgba(12,22,48,.72);
      border: 1px solid var(--line);
      border-radius: 22px;
      padding: 22px;
      backdrop-filter: blur(18px) saturate(140%);
      box-shadow: var(--shadow), inset 0 1px 0 rgba(255,255,255,.14);
    }
    .hero-form h3 { font-size: 20px; margin-bottom: 8px; }
    .form-row { margin-bottom: 12px; }
    label { display: block; font-size: 13px; color: var(--accent-marble); margin-bottom: 6px; }
    input, select, textarea {
      width: 100%; min-height: 46px; border-radius: 12px; border: 1px solid var(--line);
      background: rgba(7,11,20,.7); color: var(--text); padding: 10px 12px; font-size: 15px;
      transition: border-color .2s ease, box-shadow .2s ease;
    }
    textarea { min-height: 88px; resize: vertical; }
    input:focus, select:focus, textarea:focus {
      border-color: var(--primary-2); box-shadow: 0 0 0 3px rgba(59,130,246,.25);
    }
    .form-error { color: var(--danger-soft); font-size: 13px; min-height: 18px; }
    .form-ok {
      display: none; color: var(--ok); background: rgba(125,211,168,.1);
      border: 1px solid rgba(125,211,168,.35); border-radius: 12px; padding: 12px; font-size: 14px;
    }
    .form-ok.is-show { display: block; }
    .dots {
      position: absolute; left: 50%; bottom: 22px; transform: translateX(-50%);
      z-index: 5; display: flex; gap: 8px;
    }
    .dots button {
      width: 42px; height: 4px; border: 0; border-radius: 999px;
      background: rgba(232,238,249,.28); padding: 0;
    }
    .dots button.is-on { background: var(--primary-2); box-shadow: 0 0 10px var(--primary-2); }
    .pain { background: var(--bg-1); }
    .pain-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 28px; align-items: stretch; }
    .compare { display: grid; gap: 12px; }
    .compare-item {
      display: grid; grid-template-columns: 1fr 86px 1fr; gap: 10px; align-items: center;
      background: rgba(7,11,20,.45); border: 1px solid var(--line); border-radius: 16px; padding: 14px;
    }
    .compare-item .bad { color: var(--danger-soft); font-size: 14px; }
    .compare-item .good { color: #cfe0ff; font-size: 14px; }
    .mid {
      text-align: center; font-size: 12px; color: var(--accent-warm); letter-spacing: .08em;
    }
    .media-frame { position: relative; border-radius: 22px; overflow: hidden; min-height: 100%; border: 1px solid var(--line); }
    .media-frame img { width: 100%; height: 100%; object-fit: cover; min-height: 420px; }
    .dim-tag {
      position: absolute; left: 14px; top: 14px; background: rgba(7,11,20,.7);
      border: 1px solid var(--line); color: var(--accent-marble); font-size: 12px;
      padding: 6px 10px; border-radius: 999px;
    }
    .wire {
      position: absolute; inset: 18% 12% 22%; border: 1px dashed rgba(147,197,253,.45); pointer-events: none;
    }
    .intro { background: var(--bg-0); }
    .split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
    .split.reverse { direction: rtl; }
    .split.reverse > * { direction: ltr; }
    .spec {
      margin-top: 18px; padding: 16px; border-left: 3px solid var(--primary-2);
      background: rgba(30,78,216,.12); border-radius: 0 14px 14px 0; font-size: 14px; color: var(--text);
    }
    .ability { background: linear-gradient(180deg, #0C1630, #070B14); }
    .cards-6 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .cards-6 h3 { font-size: 20px; margin-bottom: 8px; }
    .cards-6 p { font-size: 14px; }
    .linkish {
      display: inline-flex; margin-top: 14px; color: var(--primary-2); font-size: 14px; font-weight: 600;
      min-height: 44px; align-items: center;
    }
    .linkish:hover { color: var(--accent-marble); text-shadow: 0 0 12px rgba(59,130,246,.5); }
    .process { background: var(--bg-1); }
    .timeline {
      display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; position: relative;
    }
    .timeline::before {
      content: ""; position: absolute; left: 4%; right: 4%; top: 28px; height: 2px;
      background: linear-gradient(90deg, transparent, var(--primary-2), transparent);
    }
    .step {
      position: relative; padding-top: 8px;
    }
    .step .num {
      width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center;
      background: #1E4ED8; box-shadow: var(--glow); font-size: 13px; margin-bottom: 14px; position: relative; z-index: 1;
    }
    .packages { background: var(--bg-0); }
    .cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .pkg { padding: 0; overflow: hidden; }
    .pkg img { height: 210px; width: 100%; object-fit: cover; }
    .pkg .body { padding: 20px; }
    .pkg .meta { font-size: 13px; color: var(--accent-warm); margin-bottom: 8px; }
    .cases {
      background: #050814;
      padding: 96px 0;
    }
    .cases::before {
      content: ""; position: absolute; inset: 0;
      background: radial-gradient(ellipse at center, rgba(30,78,216,.18), transparent 60%);
      pointer-events: none;
    }
    .idea {
      font-family: "Noto Serif SC", serif; font-size: clamp(22px, 3vw, 32px);
      color: var(--accent-marble); max-width: 18em; margin-bottom: 28px;
    }
    .case-wall { display: grid; grid-template-columns: 1.4fr 1fr 1fr; grid-template-rows: 220px 220px; gap: 14px; }
    .case-wall article { position: relative; overflow: hidden; border-radius: 18px; border: 1px solid var(--line); }
    .case-wall article:first-child { grid-row: 1 / span 2; }
    .case-wall img { width: 100%; height: 100%; object-fit: cover; }
    .case-wall figcaption, .case-wall span.cap {
      position: absolute; left: 0; right: 0; bottom: 0; padding: 12px 14px;
      background: linear-gradient(transparent, rgba(7,11,20,.85)); font-size: 13px;
    }
    .stats { background: var(--bg-1); padding: 72px 0; }
    .stat-bar {
      display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px;
      background: rgba(16,28,58,.55); border: 1px solid var(--line); border-radius: 22px; padding: 22px;
    }
    .stat-bar b { display: block; font-size: 32px; color: var(--accent-warm); line-height: 1.2; }
    .stat-bar span { display: block; font-size: 13px; color: var(--muted); }
    .stories { background: var(--bg-0); }
    .story {
      display: grid; grid-template-columns: .9fr 1.1fr; gap: 32px; align-items: center; margin-bottom: 40px;
    }
    .story.alt { grid-template-columns: 1.1fr .9fr; }
    .story.alt .pic { order: 2; }
    .story img { width: 100%; height: 320px; object-fit: cover; border-radius: 22px; border: 1px solid var(--line); }
    .reviews { background: var(--bg-1); }
    .review-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .who { font-size: 13px; color: var(--accent-warm); margin-bottom: 8px; }
    .audience { background: var(--bg-0); }
    .people { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
    .tags span {
      border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; font-size: 13px; color: var(--text);
      min-height: 36px; display: inline-flex; align-items: center;
    }
    .topics { background: var(--bg-1); }
    .topic-grid { display: grid; grid-template-columns: 1.4fr 1fr; grid-template-rows: 280px 280px; gap: 16px; }
    .topic {
      position: relative; overflow: hidden; border-radius: 22px; border: 1px solid var(--line);
    }
    .topic:first-child { grid-row: 1 / span 2; }
    .topic img { width: 100%; height: 100%; object-fit: cover; }
    .topic .overlay {
      position: absolute; inset: 0;
      background: linear-gradient(180deg, rgba(7,11,20,.15), rgba(7,11,20,.82));
      padding: 22px; display: flex; flex-direction: column; justify-content: flex-end;
    }
    .news { background: var(--bg-0); }
    .news-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .news-grid article:first-child { grid-column: 1 / -1; display: grid; grid-template-columns: 1.1fr 1fr; gap: 0; padding: 0; overflow: hidden; }
    .news-grid article:first-child img { height: 280px; width: 100%; object-fit: cover; }
    .news-grid .body { padding: 20px; }
    .metrics { background: var(--bg-1); }
    .metric-wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; }
    table { width: 100%; border-collapse: collapse; font-size: 14px; }
    th, td { padding: 12px 10px; text-align: left; border-bottom: 1px solid var(--line); }
    th { color: var(--accent-marble); font-weight: 600; }
    .bar { height: 8px; background: rgba(255,255,255,.08); border-radius: 99px; overflow: hidden; margin-top: 8px; }
    .bar span { display: block; height: 100%; background: linear-gradient(90deg, #1E4ED8, #3B82F6); box-shadow: 0 0 10px rgba(59,130,246,.6); }
    .faq { background: var(--bg-0); }
    .acc { border: 1px solid var(--line); border-radius: 16px; background: rgba(12,22,48,.55); margin-bottom: 10px; overflow: hidden; }
    .acc button {
      width: 100%; text-align: left; background: transparent; border: 0; color: var(--text);
      min-height: 56px; padding: 14px 18px 14px 22px; font-size: 16px; font-weight: 600;
      position: relative;
    }
    .acc button::before {
      content: ""; position: absolute; left: 0; top: 12px; bottom: 12px; width: 3px;
      background: transparent; border-radius: 99px;
    }
    .acc.is-open button::before { background: var(--primary-2); box-shadow: 0 0 10px var(--primary-2); }
    .acc .panel { display: none; padding: 0 22px 18px; color: var(--muted); font-size: 15px; }
    .acc.is-open .panel { display: block; }
    .cta {
      background:
        radial-gradient(circle at 70% 20%, rgba(59,130,246,.22), transparent 32%),
        linear-gradient(180deg, #0C1630, #070B14);
    }
    .cta-box {
      display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px;
      border: 1px solid var(--line); border-radius: 24px; padding: 28px;
      background: rgba(16,28,58,.55); box-shadow: 0 0 40px rgba(30,78,216,.2);
    }
    .site-footer {
      background: #05070e; border-top: 1px solid var(--line); padding: 56px 0 24px; color: var(--muted); font-size: 14px;
    }
    .foot-grid { display: grid; grid-template-columns: 1.3fr .8fr 1fr .9fr; gap: 24px; margin-bottom: 28px; }
    .site-footer a { color: var(--text); min-height: 36px; display: inline-flex; align-items: center; }
    .site-footer a:hover { color: var(--primary-2); }
    .legal { border-top: 1px solid rgba(147,197,253,.14); padding-top: 16px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; }
    .backtop { color: var(--accent-warm) !important; }
    @media (max-width: 1440px) {
      .hero-content { width: min(100% - 48px, 1120px); }
    }
    @media (max-width: 1024px) {
      section { padding: 80px 0; }
      .hero-content, .pain-grid, .split, .cards-6, .timeline, .cards-3, .stat-bar, .story, .story.alt, .review-grid, .people, .topic-grid, .news-grid, .metric-wrap, .cta-box, .foot-grid {
        grid-template-columns: 1fr 1fr;
      }
      .timeline { grid-template-columns: 1fr 1fr; }
      .timeline::before { display: none; }
      .cards-6, .stat-bar { grid-template-columns: 1fr 1fr; }
      .case-wall { grid-template-columns: 1fr 1fr; grid-template-rows: 200px 200px; }
      .case-wall article:first-child { grid-row: auto; }
      .topic-grid { grid-template-columns: 1fr; grid-template-rows: 240px 220px 220px; }
      .topic:first-child { grid-row: auto; min-height: 240px; }
      .news-grid article:first-child, .story.alt .pic { grid-column: auto; order: 0; }
      .nav-contact { display: none; }
      .foot-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      :root { --header-h: 68px; }
      .nav-sub { display: none; }
      .nav-sub.is-open {
        display: block; position: absolute; left: 0; right: 0; top: 68px;
        background: rgba(7,11,20,.96); padding: 10px 16px 18px; border-bottom: 1px solid var(--line);
      }
      .nav-sub.is-open .nav-links { flex-direction: column; }
      .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
      .hero-content { grid-template-columns: 1fr; min-height: auto; padding: 36px 0 88px; }
      .hero-slider, .slide img { min-height: 100%; }
      .space-chip { left: 20px; right: auto; }
      .pain-grid, .split, .split.reverse, .cards-6, .cards-3, .stat-bar, .story, .story.alt, .review-grid, .people, .news-grid, .metric-wrap, .cta-box, .foot-grid, .case-wall {
        grid-template-columns: 1fr;
      }
      .story.alt .pic { order: 0; }
      .news-grid article:first-child { display: block; }
      section { padding: 64px 0; }
      .stat-bar { grid-template-columns: 1fr 1fr; }
      .timeline { grid-template-columns: 1fr; }
    }
    @media (max-width: 520px) {
      .container { width: min(100% - 28px, var(--max)); }
      h1 { font-size: 32px; }
      .btn { width: 100%; }
      .hero-actions { flex-direction: column; }
      .compare-item { grid-template-columns: 1fr; }
      .mid { text-align: left; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { animation: none !important; transition: none !important; }
    }