/* roulang page: index */
:root {
      --ink: #2A3035;
      --slate: #3E4A52;
      --patina: #8A6230;
      --copper: #A56A45;
      --paper: #F3F0E8;
      --dust: #E6E2D8;
      --char: #15191C;
      --muted: #5C5852;
      --line: #D4CFC3;
      --cream: #FBF8F1;
      --white: #FFFdf8;
      --radius: 6px;
      --shadow: 0 2px 8px rgba(42, 48, 53, .08), 0 1px 2px rgba(42, 48, 53, .06);
      --shadow-hover: 0 8px 22px rgba(42, 48, 53, .12), 0 2px 6px rgba(42, 48, 53, .08);
      --space: 96px;
      --container: 1220px;
      --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
      --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --topbar-h: 38px;
      --nav-h: 72px;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.75;
      color: var(--ink);
      background: var(--paper);
      overflow-x: hidden;
    }
    img { max-width: 100%; display: block; height: auto; }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font-family: inherit; font-size: inherit; }
    button { cursor: pointer; border: 0; background: none; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 700; line-height: 1.35; color: var(--ink); }
    :focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; }
    .container { width: min(100% - 40px, var(--container)); margin: 0 auto; }
    .grid-paper {
      background-image:
        linear-gradient(rgba(62, 74, 82, .035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(62, 74, 82, .035) 1px, transparent 1px);
      background-size: 28px 28px;
    }

    /* Buttons */
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 48px; padding: 0 22px; border-radius: var(--radius);
      font-weight: 600; letter-spacing: .04em; transition: background .2s, color .2s, transform .2s, border-color .2s, box-shadow .2s;
    }
    .btn-solid { background: var(--ink); color: var(--cream); }
    .btn-solid:hover { background: #1b2024; transform: translateY(-2px); }
    .btn-solid:active { transform: translateY(0); background: #111417; }
    .btn-copper { background: var(--patina); color: #fff8ee; }
    .btn-copper:hover { background: #734f24; transform: translateY(-2px); }
    .btn-copper:active { transform: translateY(1px); }
    .btn-ghost { background: transparent; color: var(--cream); border: 1px solid rgba(243, 240, 232, .55); }
    .btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); transform: translateY(-2px); }
    .btn-line { background: transparent; color: var(--ink); border: 1px solid var(--ink); }
    .btn-line:hover { background: var(--ink); color: var(--cream); transform: translateY(-2px); }
    .btn-line:active { transform: translateY(0); }

    .badge {
      display: inline-flex; align-items: center; gap: 8px;
      font-size: 12px; letter-spacing: .18em; text-transform: none;
      color: var(--patina); font-weight: 600;
    }
    .badge::before { content: ""; width: 18px; height: 1px; background: var(--copper); }

    /* Dual-row header */
    .site-header { position: relative; z-index: 80; }
    .topbar {
      height: var(--topbar-h); background: var(--char); color: #c9c3b8;
      font-size: 12px; display: flex; align-items: center;
    }
    .topbar .container { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
    .topbar-left, .topbar-right { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
    .topbar a { color: #e6e2d8; }
    .topbar a:hover { color: #fff; }
    .nav-main {
      background: rgba(243, 240, 232, .96);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(8px);
    }
    .nav-main.is-stuck {
      position: sticky; top: 0; z-index: 90;
      box-shadow: 0 4px 16px rgba(21, 25, 28, .08);
    }
    .nav-inner { display: flex; align-items: center; min-height: var(--nav-h); gap: 20px; }
    .logo {
      display: flex; align-items: center; gap: 10px; flex-shrink: 0;
      font-family: var(--font-serif); font-weight: 700; font-size: 18px; color: var(--ink);
    }
    .logo-mark {
      width: 36px; height: 36px; border: 1.5px solid var(--patina); border-radius: 50%;
      display: grid; place-items: center; color: var(--patina); font-size: 11px; letter-spacing: 0;
      font-family: var(--font-serif);
    }
    .nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
    .nav-links a {
      position: relative; padding: 10px 12px; min-height: 44px; display: inline-flex; align-items: center;
      font-size: 14px; color: var(--slate); font-weight: 500;
    }
    .nav-links a::after {
      content: ""; position: absolute; left: 12px; right: 12px; bottom: 6px; height: 2px;
      background: var(--copper); transform: scaleX(0); transform-origin: left; transition: transform .2s;
    }
    .nav-links a:hover, .nav-links a.is-active { color: var(--ink); }
    .nav-links a:hover::after, .nav-links a.is-active::after { transform: scaleX(1); }
    .nav-cta { margin-left: 8px; min-height: 44px; padding: 0 16px; font-size: 14px; }
    .nav-toggle {
      display: none; width: 44px; height: 44px; margin-left: auto;
      flex-direction: column; justify-content: center; align-items: center; gap: 6px;
    }
    .nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); transition: .2s; }
    .nav-toggle.is-open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .nav-toggle.is-open span:nth-child(2) { opacity: 0; }
    .nav-toggle.is-open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
    .drawer {
      display: none; position: fixed; inset: 0; background: rgba(21, 25, 28, .45); z-index: 100;
    }
    .drawer.is-open { display: block; }
    .drawer-panel {
      position: absolute; top: 0; right: 0; width: min(86vw, 360px); height: 100%;
      background: var(--paper); padding: 28px 24px; box-shadow: -8px 0 30px rgba(0,0,0,.18);
      display: flex; flex-direction: column; gap: 8px;
    }
    .drawer-panel a {
      min-height: 48px; display: flex; align-items: center;
      border-bottom: 1px solid var(--line); font-size: 16px; font-weight: 600;
    }

    /* Hero */
    .hero { position: relative; background: var(--char); color: var(--cream); overflow: hidden; }
    .hero-slide { display: none; min-height: 640px; padding: 56px 0 72px; }
    .hero-slide.is-on { display: block; }
    .hero-grid {
      display: grid; grid-template-columns: 5fr 7fr; gap: 36px; align-items: center;
    }
    .hero-copy { position: relative; z-index: 2; padding-right: 12px; }
    .hero h1, .hero .slide-title {
      font-size: clamp(32px, 4.2vw, 52px); color: #f7f3ea; margin: 14px 0 18px; max-width: 16em;
    }
    .hero-lead { color: #d8d2c6; font-size: 16px; line-height: 1.9; margin-bottom: 28px; max-width: 36em; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 32px; }
    .hero-kpis { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; border-top: 1px solid rgba(232, 224, 208, .18); padding-top: 22px; }
    .hero-kpis strong { display: block; font-variant-numeric: tabular-nums; font-family: var(--font-serif); font-size: 22px; color: #f3ead8; }
    .hero-kpis span { font-size: 12px; color: #b7b0a4; }
    .hero-visual {
      position: relative; transform: translate(-18px, 18px) rotate(-1.6deg);
      clip-path: polygon(3% 0, 100% 0, 97% 100%, 0 100%);
      box-shadow: 0 18px 40px rgba(0,0,0,.35);
    }
    .hero-visual img { width: 100%; height: 520px; object-fit: cover; filter: saturate(.86) contrast(1.05); }
    .hero-frame {
      position: absolute; inset: 12px; border: 1px solid rgba(165, 106, 69, .55); pointer-events: none;
    }
    .hero-dots { display: flex; gap: 8px; margin-top: 8px; }
    .hero-dots button {
      width: 28px; height: 44px; display: grid; place-items: center;
    }
    .hero-dots button i {
      display: block; width: 22px; height: 2px; background: rgba(243,240,232,.35);
    }
    .hero-dots button.is-on i { background: var(--copper); }
    .hero-shade {
      position: absolute; inset: 0;
      background: radial-gradient(1200px 500px at 18% 40%, rgba(21,25,28,.2), transparent 60%);
      pointer-events: none;
    }

    /* Sections common */
    main section { padding: var(--space) 0; position: relative; }
    .sec-head { max-width: 720px; margin-bottom: 40px; }
    .sec-head.wide { max-width: none; display: flex; justify-content: space-between; gap: 32px; align-items: end; }
    .sec-head h2 { font-size: clamp(26px, 3vw, 36px); margin: 8px 0 14px; }
    .sec-head p { color: var(--muted); font-size: 15px; }
    .kicker { font-size: 12px; letter-spacing: .22em; color: var(--patina); font-weight: 600; }

    /* Intro */
    #intro { background: var(--cream); }
    .intro-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
    .intro-photo { position: relative; }
    .intro-photo img { width: 100%; height: 460px; object-fit: cover; border-radius: 4px; box-shadow: var(--shadow); }
    .intro-photo::after {
      content: ""; position: absolute; inset: 18px -16px -16px 18px; border: 1px solid var(--copper); pointer-events: none;
    }
    .intro-copy h2 { font-size: clamp(26px, 3vw, 34px); margin: 10px 0 18px; }
    .intro-copy p { color: var(--muted); margin-bottom: 14px; }
    .norm-list { margin-top: 18px; display: grid; gap: 10px; }
    .norm-list li {
      display: grid; grid-template-columns: 52px 1fr; gap: 12px; padding: 12px 0;
      border-top: 1px solid var(--line); font-size: 14px;
    }
    .norm-list b { font-family: var(--font-serif); color: var(--patina); }

    /* Services matrix */
    #services { background: var(--paper); }
    .matrix { display: grid; grid-template-columns: 280px 1fr; gap: 28px; min-height: 420px; }
    .matrix-index { border-right: 1px solid var(--line); }
    .matrix-index button {
      width: 100%; text-align: left; padding: 16px 12px 16px 0; min-height: 64px;
      display: grid; grid-template-columns: 42px 1fr; gap: 8px; align-items: center;
      border-bottom: 1px solid var(--line); color: var(--slate);
    }
    .matrix-index button em { font-style: normal; font-family: var(--font-serif); color: var(--copper); font-size: 14px; }
    .matrix-index button strong { display: block; font-size: 15px; font-weight: 600; color: var(--ink); }
    .matrix-index button.is-on { background: linear-gradient(90deg, rgba(165,106,69,.08), transparent); }
    .matrix-index button.is-on em { color: var(--patina); }
    .matrix-panel {
      background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius);
      padding: 32px; box-shadow: var(--shadow); min-height: 380px;
    }
    .matrix-panel h3 { font-size: 26px; margin-bottom: 12px; }
    .matrix-panel p { color: var(--muted); margin-bottom: 16px; }
    .chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 22px; }
    .chip { font-size: 12px; padding: 6px 10px; border: 1px solid var(--line); color: var(--slate); border-radius: 4px; background: var(--white); }
    .panel-item { display: none; }
    .panel-item.is-on { display: block; }

    /* Strengths */
    #strengths { background: var(--dust); }
    .cards-6 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .card {
      background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius);
      box-shadow: var(--shadow); padding: 24px; transition: transform .2s, box-shadow .2s;
    }
    .card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
    .card .no { font-family: var(--font-serif); color: var(--copper); font-size: 13px; letter-spacing: .16em; }
    .card h3 { font-size: 18px; margin: 8px 0 10px; }
    .card p { font-size: 14px; color: var(--muted); }

    /* Scenes */
    #scenes { background: var(--cream); }
    .scene-grid { display: grid; grid-template-columns: 1.4fr 1fr; grid-template-rows: auto auto; gap: 18px; }
    .scene { position: relative; overflow: hidden; border-radius: 4px; min-height: 220px; color: #f6f1e6; }
    .scene img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; filter: brightness(.55) saturate(.8); }
    .scene-body { position: relative; z-index: 1; padding: 28px; height: 100%; display: flex; flex-direction: column; justify-content: flex-end; }
    .scene.large { grid-row: 1 / span 2; min-height: 480px; }
    .scene h3 { font-size: 22px; color: #fff; margin: 8px 0; }
    .scene p { color: #ddd6c8; font-size: 14px; }

    /* Stats */
    #stats { background: var(--ink); color: #e8e2d6; padding: 56px 0; }
    .stats { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .stat { text-align: left; padding: 8px 12px; border-left: 1px solid rgba(232,226,214,.18); }
    .stat b {
      display: block; font-family: var(--font-serif); font-size: 28px; color: #f3ead8;
      font-variant-numeric: tabular-nums; letter-spacing: .04em;
    }
    .stat span { font-size: 13px; color: #b8b1a4; }

    /* Process */
    #process { background: var(--paper); }
    .steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: step; }
    .step { padding: 8px 18px 8px 0; position: relative; }
    .step + .step::before {
      content: ""; position: absolute; left: -12px; top: 22px; width: 24px; height: 1px; background: var(--copper);
    }
    .step i {
      display: inline-flex; width: 36px; height: 36px; border: 1px solid var(--copper); border-radius: 50%;
      align-items: center; justify-content: center; font-family: var(--font-serif); font-style: normal; color: var(--patina); font-size: 13px;
    }
    .step h3 { font-size: 16px; margin: 12px 0 8px; }
    .step p { font-size: 13px; color: var(--muted); }

    /* Cases */
    #cases { background: var(--char); color: #d9d3c7; }
    #cases .sec-head h2, #cases .kicker { color: #f3ead8; }
    #cases .sec-head p { color: #b8b1a4; }
    .case-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .dossier {
      background: linear-gradient(180deg, #1d2327, #14181b);
      border: 1px solid rgba(165, 106, 69, .28); border-radius: 4px; padding: 20px 18px 22px;
      min-height: 210px; position: relative;
    }
    .dossier::before {
      content: ""; position: absolute; top: 0; left: 24px; right: 24px; height: 3px; background: var(--copper);
    }
    .dossier .tag { font-size: 12px; color: var(--copper); letter-spacing: .12em; }
    .dossier h3 { color: #f4eee3; font-size: 17px; margin: 10px 0; }
    .dossier p { font-size: 13px; color: #b3ada1; }
    .dossier .meta { margin-top: 16px; font-size: 12px; color: #8d877c; border-top: 1px dashed rgba(201,195,181,.2); padding-top: 10px; }

    /* Stories */
    #stories { background: var(--cream); }
    .story-list { display: grid; gap: 18px; }
    .story {
      display: grid; grid-template-columns: 180px 1fr; gap: 28px;
      background: var(--white); border: 1px solid var(--line); border-left: 4px solid var(--patina);
      padding: 24px; border-radius: 0 var(--radius) var(--radius) 0; box-shadow: var(--shadow);
    }
    .story .who { font-family: var(--font-serif); font-size: 16px; }
    .story .who small { display: block; color: var(--muted); font-family: var(--font-sans); font-size: 12px; margin-top: 6px; }
    .story p { color: var(--muted); font-size: 15px; }

    /* Reviews */
    #reviews { background: var(--dust); }
    .review-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .review { background: var(--cream); padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); }
    .review p { font-size: 14px; color: var(--slate); min-height: 96px; }
    .review .by { margin-top: 16px; font-size: 12px; color: var(--patina); font-weight: 600; }

    /* Insights */
    #insights { background: var(--paper); }
    .news-list { display: grid; gap: 16px; }
    .news {
      display: grid; grid-template-columns: 220px 1fr; gap: 22px; align-items: center;
      background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
      box-shadow: var(--shadow);
    }
    .news img { width: 100%; height: 140px; object-fit: cover; }
    .news-body { padding: 16px 18px 16px 0; }
    .news h3 { font-size: 18px; margin-bottom: 8px; }
    .news p { font-size: 14px; color: var(--muted); }

    /* Partners */
    #partners { background: var(--cream); padding: 64px 0; }
    .partner-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
    .partner {
      text-align: center; padding: 18px 10px; border: 1px solid var(--line); color: var(--muted);
      font-size: 14px; background: var(--dust); filter: grayscale(1); border-radius: 4px;
    }

    /* Topics */
    #priority, #claims { background: var(--paper); }
    #claims { background: var(--dust); }
    .split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
    .risk {
      background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px;
    }
    .risk h3 { font-size: 18px; margin-bottom: 12px; }
    .risk li { position: relative; padding: 8px 0 8px 18px; font-size: 14px; color: var(--muted); border-bottom: 1px dashed var(--line); }
    .risk li::before { content: ""; position: absolute; left: 0; top: 16px; width: 7px; height: 7px; border: 1px solid var(--copper); border-radius: 50%; }
    .topic-points p { color: var(--muted); margin-bottom: 14px; }

    /* FAQ */
    #faq { background: var(--cream); }
    .faq-list { display: grid; gap: 10px; }
    .faq-item { border: 1px solid var(--line); background: var(--white); border-radius: var(--radius); overflow: hidden; }
    .faq-item button {
      width: 100%; text-align: left; min-height: 56px; padding: 14px 18px;
      display: flex; justify-content: space-between; gap: 16px; align-items: center; font-weight: 600;
    }
    .faq-item button span { font-family: var(--font-serif); color: var(--copper); font-size: 13px; }
    .faq-item .ans { display: none; padding: 0 18px 18px; color: var(--muted); font-size: 14px; }
    .faq-item.is-open .ans { display: block; }
    .faq-item.is-open button span { transform: rotate(90deg); }

    /* Assurance */
    #assurance { background: var(--ink); color: #d8d2c6; padding: 48px 0; }
    .assure { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
    .assure-item { border-top: 2px solid var(--copper); padding-top: 14px; }
    .assure-item h3 { color: #f3ead8; font-size: 16px; margin-bottom: 6px; }
    .assure-item p { font-size: 13px; color: #b4aea2; }

    /* Contact */
    #contact { background: var(--paper); }
    .contact-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; }
    .form-box {
      background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius);
      padding: 28px; box-shadow: var(--shadow);
    }
    .form-row { margin-bottom: 14px; }
    .form-row label { display: block; font-size: 13px; margin-bottom: 6px; color: var(--slate); font-weight: 600; }
    .form-row input, .form-row select, .form-row textarea {
      width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid var(--line);
      background: var(--white); color: var(--ink); border-radius: 4px;
    }
    .form-row textarea { min-height: 110px; resize: vertical; }
    .form-row input:focus, .form-row select:focus, .form-row textarea:focus {
      outline: 2px solid var(--copper); border-color: var(--copper);
    }
    .form-msg { display: none; margin-top: 12px; font-size: 14px; color: var(--patina); }
    .form-msg.is-on { display: block; }
    .form-err { color: #8a3030; font-size: 12px; min-height: 16px; }
    .info-box h3 { margin: 18px 0 8px; font-size: 18px; }
    .info-box p, .info-box a { color: var(--muted); font-size: 14px; }
    .info-box .map-note {
      margin-top: 20px; padding: 16px; background: var(--dust); border-left: 3px solid var(--patina); font-size: 13px; color: var(--slate);
    }

    /* Footer */
    .site-footer { background: #101417; color: #b8b2a6; padding: 56px 0 24px; }
    .foot-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr 1.1fr; gap: 28px; margin-bottom: 36px; }
    .site-footer h3 { color: #efe8db; font-size: 15px; margin-bottom: 12px; }
    .site-footer a { display: block; padding: 5px 0; min-height: 32px; color: #b8b2a6; }
    .site-footer a:hover { color: #fff; }
    .foot-brand { font-family: var(--font-serif); color: #efe8db; font-size: 18px; margin-bottom: 10px; }
    .copy { border-top: 1px solid rgba(201,195,181,.12); padding-top: 16px; font-size: 12px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

    @media (max-width: 1280px) {
      .hero-visual img { height: 460px; }
      .case-wall { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 1024px) {
      :root { --space: 72px; }
      .nav-links { display: none; }
      .nav-cta { display: none; }
      .nav-toggle { display: flex; }
      .hero-grid, .intro-grid, .matrix, .scene-grid, .split, .contact-grid, .story, .news { grid-template-columns: 1fr; }
      .hero-visual { transform: none; clip-path: none; }
      .hero-visual img { height: 320px; }
      .hero-slide { min-height: 0; }
      .cards-6, .review-grid { grid-template-columns: repeat(2, 1fr); }
      .steps, .stats, .assure { grid-template-columns: repeat(2, 1fr); gap: 18px; }
      .step + .step::before { display: none; }
      .case-wall { grid-template-columns: repeat(2, 1fr); }
      .foot-grid { grid-template-columns: 1fr 1fr; }
      .sec-head.wide { flex-direction: column; align-items: start; }
      .news img { height: 200px; }
      .intro-photo img { height: 360px; }
    }
    @media (max-width: 768px) {
      :root { --space: 56px; }
      .topbar-right { display: none; }
      .cards-6, .review-grid, .partner-row, .case-wall, .stats, .assure, .steps { grid-template-columns: 1fr; }
      .hero-kpis { grid-template-columns: 1fr 1fr 1fr; }
      .hero h1, .hero .slide-title { font-size: 30px; }
      .scene.large { min-height: 320px; }
    }
    @media (max-width: 520px) {
      .container { width: min(100% - 28px, var(--container)); }
      .hero-kpis { grid-template-columns: 1fr; }
      .hero-actions { flex-direction: column; align-items: stretch; }
      .btn { width: 100%; }
      .copy { flex-direction: column; }
      .logo span { font-size: 16px; }
    }