/* roulang page: index */
:root {
      --c-telem: #0E8F82;
      --c-telem-deep: #0B6F66;
      --c-amber: #E2A01A;
      --c-asphalt: #2A3946;
      --c-night: #141B22;
      --c-ink: #12171C;
      --c-mute: #5C6770;
      --c-fog: #F3F5F2;
      --c-gauge: #E7ECE8;
      --c-line: #D5DDD8;
      --c-white: #FFFFFF;
      --c-danger: #A33B2B;
      --radius-card: 24px;
      --radius-btn: 14px;
      --radius-pill: 999px;
      --shadow-low: 0 8px 16px rgba(18, 23, 28, 0.08);
      --shadow-mid: 0 12px 28px rgba(18, 23, 28, 0.10);
      --shadow-hover: 0 14px 24px rgba(14, 143, 130, 0.14);
      --space-xl: 88px;
      --space-lg: 72px;
      --space-md: 56px;
      --header-top: 40px;
      --header-main: 70px;
      --z-bar: 40;
      --z-header: 50;
      --z-drawer: 80;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", sans-serif;
      color: var(--c-ink);
      background: var(--c-fog);
      line-height: 1.75;
      font-size: 16px;
      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; border: 0; background: none; }
    h1, h2, h3, h4 { margin: 0; line-height: 1.28; color: var(--c-ink); font-weight: 700; }
    h1 { font-size: 44px; }
    h2 { font-size: 30px; }
    h3 { font-size: 20px; }
    p { margin: 0; }
    .tabular { font-family: Inter, "DIN Alternate", "Noto Sans SC", sans-serif; font-variant-numeric: tabular-nums; }
    .container { width: min(1240px, calc(100% - 40px)); margin: 0 auto; }
    .skip-link {
      position: absolute; left: 12px; top: -40px; z-index: 100;
      background: var(--c-amber); color: var(--c-ink); padding: 8px 12px; border-radius: 8px;
    }
    .skip-link:focus { top: 12px; }
    .site-header { position: relative; z-index: var(--z-header); }
    .nav-top {
      height: var(--header-top);
      background: #10171d;
      color: #d7e0dc;
      font-size: 13px;
    }
    .nav-top .container {
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }
    .nav-top a { color: #e8eeea; }
    .nav-top a:hover { color: var(--c-amber); }
    .nav-top-left, .nav-top-right { display: flex; align-items: center; gap: 18px; min-height: 44px; }
    .trust-chip {
      color: #b9c6c0;
      border-left: 1px solid #2d3a42;
      padding-left: 14px;
    }
    .btn-mini {
      display: inline-flex; align-items: center; justify-content: center;
      min-height: 28px; padding: 0 12px; border-radius: var(--radius-pill);
      background: var(--c-telem); color: #fff !important; font-size: 12px; font-weight: 600;
    }
    .btn-mini:hover { filter: brightness(1.06); }
    .nav-main {
      position: sticky; top: 0; z-index: var(--z-header);
      height: var(--header-main);
      background: rgba(243, 245, 242, 0.92);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid transparent;
      transition: box-shadow .2s ease, background .2s ease, border-color .2s ease;
    }
    .nav-main.is-scrolled {
      box-shadow: 0 8px 18px rgba(18, 23, 28, 0.08);
      background: rgba(243, 245, 242, 0.97);
      border-bottom-color: #dce4df;
    }
    .nav-main .container {
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }
    .logo {
      display: flex; align-items: center; gap: 10px; min-height: 44px; flex-shrink: 0;
    }
    .logo-mark {
      width: 38px; height: 38px; border-radius: 12px;
      background: linear-gradient(145deg, #141B22 0%, #0E8F82 100%);
      position: relative; overflow: hidden;
    }
    .logo-mark::before {
      content: ""; position: absolute; left: 8px; right: 8px; top: 18px; height: 0;
      border-top: 2px dashed rgba(226, 160, 26, .85);
    }
    .logo-mark::after {
      content: ""; position: absolute; left: 7px; right: 7px; bottom: 8px; height: 8px;
      border: 2px solid #9fe3db; border-top: 0; border-radius: 0 0 12px 12px;
    }
    .logo-text { display: flex; flex-direction: column; line-height: 1.15; }
    .logo-text strong { font-size: 16px; font-weight: 700; color: var(--c-ink); }
    .logo-text span { font-size: 12px; color: var(--c-mute); font-weight: 500; }
    .nav-links { display: flex; align-items: center; gap: 4px; }
    .nav-links a {
      position: relative; min-height: 44px; display: inline-flex; align-items: center;
      padding: 0 12px; font-size: 15px; color: var(--c-asphalt); font-weight: 500;
    }
    .nav-links a:hover { color: var(--c-telem); }
    .nav-links a.is-active { color: var(--c-telem-deep); }
    .nav-links a.is-active::after,
    .nav-links a:hover::after {
      content: ""; position: absolute; left: 12px; right: 12px; bottom: 8px; height: 3px;
      border-radius: 99px; background: linear-gradient(90deg, var(--c-telem), var(--c-amber));
    }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 46px; padding: 0 22px; border-radius: var(--radius-pill);
      font-weight: 600; font-size: 15px; transition: transform .2s ease, filter .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
    }
    .btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
      outline: 2px solid var(--c-amber); outline-offset: 2px;
    }
    .btn-primary {
      background: linear-gradient(135deg, #0E8F82 0%, #2A3946 100%);
      color: #fff; box-shadow: 0 8px 16px rgba(14, 143, 130, .22);
    }
    .btn-primary:hover { filter: brightness(1.06); transform: translateY(-2px); }
    .btn-primary:active { transform: translateY(0); }
    .btn-ghost {
      background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,.55);
      border-radius: var(--radius-btn);
    }
    .btn-ghost:hover { background: rgba(255,255,255,.08); border-color: #fff; }
    .btn-line {
      background: #fff; color: var(--c-telem-deep); border: 1.5px solid #b7dcd7; border-radius: var(--radius-btn);
    }
    .btn-line:hover { border-color: var(--c-telem); box-shadow: var(--shadow-hover); transform: translateY(-2px); }
    .btn-amber {
      background: linear-gradient(135deg, #E2A01A, #c88810); color: #141B22;
    }
    .btn-amber:hover { filter: brightness(1.06); transform: translateY(-2px); }
    .menu-toggle {
      display: none; width: 44px; height: 44px; border-radius: 12px;
      border: 1px solid var(--c-line); align-items: center; justify-content: center; flex-direction: column; gap: 5px;
    }
    .menu-toggle span { width: 18px; height: 2px; background: var(--c-ink); display: block; }
    .drawer-mask {
      position: fixed; inset: 0; background: rgba(20, 27, 34, .46); opacity: 0; pointer-events: none;
      transition: opacity .2s ease; z-index: 70;
    }
    .drawer-mask.open { opacity: 1; pointer-events: auto; }
    .drawer {
      position: fixed; top: 0; right: 0; width: min(86vw, 360px); height: 100%;
      background: #f7f8f6; z-index: var(--z-drawer); transform: translateX(100%);
      transition: transform .24s ease; padding: 24px 20px 32px; display: flex; flex-direction: column; gap: 12px;
    }
    .drawer.open { transform: translateX(0); }
    .drawer a, .drawer button.linkish {
      min-height: 44px; display: flex; align-items: center; padding: 0 8px; font-size: 16px; font-weight: 600; color: var(--c-ink);
    }
    .hero {
      position: relative; min-height: 680px; overflow: hidden;
      clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
      margin-bottom: -40px;
    }
    .slides { position: absolute; inset: 0; }
    .slide {
      position: absolute; inset: 0; opacity: 0; transition: opacity .7s ease;
      background-size: cover; background-position: center;
    }
    .slide.is-on { opacity: 1; z-index: 1; }
    .slide::after {
      content: ""; position: absolute; inset: 0;
      background:
        linear-gradient(90deg, rgba(20,27,34,.88) 0%, rgba(20,27,34,.62) 48%, rgba(14,143,130,.28) 100%),
        linear-gradient(180deg, rgba(20,27,34,.18), rgba(20,27,34,.35));
    }
    .hero-grid {
      position: relative; z-index: 2; min-height: 680px;
      display: grid; grid-template-columns: 1.15fr .85fr; gap: 36px; align-items: center;
      padding: 54px 0 92px;
    }
    .kicker {
      display: inline-flex; align-items: center; gap: 8px; min-height: 32px; padding: 0 12px;
      border-radius: var(--radius-pill); background: rgba(14,143,130,.18); color: #d9f4f0;
      border: 1px solid rgba(226,160,26,.45); font-size: 13px; font-weight: 600; margin-bottom: 16px;
    }
    .hero h1 { color: #fff; margin-bottom: 16px; max-width: 18em; }
    .hero .lead { color: #d5ddd8; font-size: 16px; max-width: 38em; margin-bottom: 18px; }
    .hero .pain { color: #f3e1b0; font-size: 15px; margin-bottom: 22px; }
    .badge-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 24px; }
    .data-badge {
      display: inline-flex; flex-direction: column; justify-content: center;
      min-width: 108px; padding: 8px 14px; border-radius: var(--radius-pill);
      background: #e6f4f2; color: var(--c-telem-deep); border: 1px solid #b7dcd7;
    }
    .data-badge .n { font-family: Inter, sans-serif; font-variant-numeric: tabular-nums; font-size: 20px; font-weight: 700; line-height: 1.1; }
    .data-badge .l { font-size: 12px; color: var(--c-mute); }
    .data-badge.amber { background: #f8e8c4; border-color: #e7c77a; color: #7a5608; }
    .data-badge.ghost {
      background: rgba(20,27,34,.35); border: 1px solid rgba(226,160,26,.55); color: #fff;
    }
    .data-badge.ghost .l { color: #d7e0dc; }
    .hero-form {
      background: #fff; border-radius: 28px; padding: 22px 22px 20px; box-shadow: var(--shadow-mid);
      border: 1px solid #e4ebe6;
    }
    .hero-form h3 { margin-bottom: 6px; }
    .hero-form p { color: var(--c-mute); font-size: 14px; margin-bottom: 14px; }
    .field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
    .field label { font-size: 13px; font-weight: 600; color: var(--c-asphalt); }
    .field input, .field select, .field textarea {
      min-height: 44px; border: 1px solid #cfd8d3; border-radius: 12px; padding: 8px 12px;
      background: #fbfcfb; color: var(--c-ink); font-size: 15px;
    }
    .field textarea { min-height: 88px; resize: vertical; }
    .field input:focus, .field select:focus, .field textarea:focus { border-color: var(--c-telem); background: #fff; }
    .field.error input, .field.error select { border-color: #A33B2B; }
    .field .err { display: none; color: var(--c-danger); font-size: 12px; }
    .field.error .err { display: block; }
    .checks { display: flex; flex-wrap: wrap; gap: 8px 14px; }
    .checks label { display: flex; align-items: center; gap: 6px; font-size: 14px; min-height: 36px; }
    .form-ok {
      display: none; margin-top: 10px; padding: 10px 12px; border-radius: 12px;
      background: #e6f4f2; color: var(--c-telem-deep); font-size: 14px; font-weight: 600;
    }
    .form-ok.show { display: block; }
    .carousel-nav {
      position: absolute; z-index: 3; left: 0; right: 0; bottom: 58px;
      display: flex; align-items: center; justify-content: space-between;
      width: min(1240px, calc(100% - 40px)); margin: 0 auto;
    }
    .c-btn {
      width: 44px; height: 44px; border-radius: 50%; background: rgba(255,255,255,.16);
      color: #fff; border: 1px solid rgba(255,255,255,.35); font-size: 20px;
    }
    .c-btn:hover { background: rgba(14,143,130,.8); }
    .dots { display: flex; gap: 8px; }
    .dots button {
      width: 10px; height: 10px; border-radius: 99px; background: rgba(255,255,255,.4);
    }
    .dots button.is-on { width: 26px; background: var(--c-amber); }
    main { position: relative; z-index: 1; }
    .band { padding: var(--space-xl) 0; }
    .band h2 { margin-bottom: 14px; }
    .band .sec-lead { color: var(--c-mute); max-width: 46em; margin-bottom: 32px; }
    .band-alt { background: #fff; }
    .band-fog { background: var(--c-fog); }
    .band-gauge { background: var(--c-gauge); }
    .card {
      background: #fff; border-radius: var(--radius-card); padding: 24px;
      box-shadow: var(--shadow-low); border: 1px solid #e7eeea;
      transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
    }
    .card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: rgba(14,143,130,.28); }
    .metric-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
    .metric-card .data-badge { margin-bottom: 14px; }
    .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 36px; align-items: center; }
    .media { border-radius: 24px; overflow: hidden; position: relative; }
    .media img { width: 100%; height: 100%; object-fit: cover; min-height: 360px; }
    .mini-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
    .scene-switch { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
    .scene-switch button {
      min-height: 44px; padding: 0 16px; border-radius: var(--radius-pill);
      background: #fff; border: 1px solid var(--c-line); color: var(--c-asphalt); font-weight: 600;
    }
    .scene-switch button.is-on {
      background: linear-gradient(135deg, #0E8F82, #2A3946); color: #fff; border-color: transparent;
    }
    .scene-panel { display: none; }
    .scene-panel.is-on { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; }
    .steps { display: grid; gap: 12px; }
    .steps li { list-style: none; background: #f6f8f6; border-radius: 16px; padding: 12px 14px; display: flex; gap: 10px; }
    .steps { margin: 0; padding: 0; }
    .idx {
      width: 28px; height: 28px; border-radius: 50%; background: var(--c-telem); color: #fff;
      display: inline-flex; align-items: center; justify-content: center; font-size: 13px; flex-shrink: 0;
      font-family: Inter, sans-serif;
    }
    .demo-map {
      margin-top: 16px; height: 92px; border-radius: 16px;
      background:
        linear-gradient(90deg, transparent 49%, #0E8F82 49%, #0E8F82 51%, transparent 51%),
        repeating-linear-gradient(90deg, #d7e4df 0 12px, transparent 12px 22px),
        #eef3f0;
      position: relative; overflow: hidden;
    }
    .demo-map span {
      position: absolute; top: 50%; width: 14px; height: 14px; border-radius: 50%;
      background: var(--c-amber); transform: translateY(-50%);
      box-shadow: 0 0 0 6px rgba(226,160,26,.25);
      animation: run 6s linear infinite;
    }
    @keyframes run { from { left: 8%; } to { left: 86%; } }
    .flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
    .flow-card { text-align: left; }
    .adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .ico {
      width: 42px; height: 42px; border-radius: 14px; margin-bottom: 14px;
      border: 1.5px solid #b7dcd7; display: grid; place-items: center; color: var(--c-telem-deep);
    }
    .ico svg { width: 22px; height: 22px; stroke: currentColor; fill: none; stroke-width: 1.8; }
    .mod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
    .mod-card { padding: 0; overflow: hidden; }
    .mod-card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }
    .mod-card .body { padding: 20px 22px 22px; }
    .mod-card h3 { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .mod-card .clip { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; color: var(--c-mute); margin: 8px 0 12px; }
    .mod-card ul { margin: 0 0 16px; padding: 0; display: grid; gap: 6px; }
    .mod-card li { list-style: none; padding-left: 16px; position: relative; font-size: 14px; color: var(--c-asphalt); }
    .mod-card li::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--c-telem); position: absolute; left: 0; top: 8px; }
    .dark-band {
      background: linear-gradient(135deg, #141B22 0%, #0E8F82 100%);
      color: #e8eeea; padding: 84px 0; position: relative;
    }
    .dark-band h2, .dark-band h3 { color: #fff; }
    .dark-inner { display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px; }
    .rule { padding: 10px 0; border-bottom: 1px dashed rgba(255,255,255,.2); }
    .case-grid { display: grid; gap: 16px; }
    .case-card {
      background: rgba(20,27,34,.28); border: 1px solid rgba(226,160,26,.35);
      border-radius: 22px; padding: 18px 20px;
    }
    .compare { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
    .compare-col { padding: 26px; }
    .win { border: 2px solid transparent; background:
      linear-gradient(#fff, #fff) padding-box,
      linear-gradient(135deg, #0E8F82, #E2A01A) border-box;
    }
    .row-line { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid #e7eeea; font-size: 15px; }
    .story-grid, .review-grid, .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .avatar {
      width: 48px; height: 48px; border-radius: 50%; object-fit: cover; background: #d7e4df;
    }
    .quote { font-size: 15px; color: var(--c-asphalt); margin: 12px 0; }
    .stars { color: #E2A01A; letter-spacing: 2px; font-size: 14px; }
    .stats {
      background: linear-gradient(90deg, #e7ece8, #e6f4f2);
      padding: 36px 0;
    }
    .stats-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; text-align: center; }
    .stat .n { font-size: 32px; font-weight: 700; color: var(--c-telem-deep); }
    .news-card time { font-size: 12px; color: var(--c-mute); }
    .faq-item { margin-bottom: 12px; overflow: hidden; }
    .faq-item button {
      width: 100%; text-align: left; min-height: 56px; padding: 14px 18px;
      display: flex; justify-content: space-between; align-items: center; gap: 12px;
      font-size: 16px; font-weight: 650; color: var(--c-ink);
    }
    .faq-item .a { display: none; padding: 0 18px 16px; background: #f6f8f6; color: var(--c-asphalt); }
    .faq-item.open .a { display: block; }
    .chev { transition: transform .2s ease; }
    .faq-item.open .chev { transform: rotate(180deg); }
    .g-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .cta-box {
      display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px;
      background: #fff; border-radius: 28px; padding: 32px; box-shadow: var(--shadow-mid);
    }
    .cta-points { display: grid; gap: 10px; margin-top: 16px; }
    .cta-points div { padding-left: 14px; position: relative; color: var(--c-asphalt); }
    .cta-points div::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--c-amber); position: absolute; left: 0; top: 9px; }
    .site-footer {
      background: linear-gradient(180deg, #141B22 0%, #0E8F82 160%);
      color: #d7e0dc; padding: 64px 0 28px; margin-top: 20px;
    }
    .foot-grid { display: grid; grid-template-columns: 1.3fr .8fr 1.1fr .8fr; gap: 28px; }
    .site-footer a { color: #e8eeea; }
    .site-footer a:hover { color: var(--c-amber); }
    .site-footer h3 { color: #fff; font-size: 16px; margin-bottom: 12px; }
    .foot-copy { margin-top: 28px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; color: #b9c6c0; }
    .dock {
      position: fixed; left: 0; right: 0; bottom: 0; z-index: var(--z-bar);
      background: linear-gradient(90deg, #141B22, #0E8F82);
      color: #fff; transform: translateY(110%); transition: transform .25s ease;
      padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
      box-shadow: 0 -8px 20px rgba(0,0,0,.18);
    }
    .dock.show { transform: translateY(0); }
    .dock .container { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
    .lane-deco {
      background-image: repeating-linear-gradient(90deg, rgba(14,143,130,.08) 0 10px, transparent 10px 22px);
    }
    body.has-dock { padding-bottom: 76px; }
    #cta { padding-bottom: 120px; }
    @media (max-width: 1024px) {
      h1 { font-size: 36px; }
      h2 { font-size: 26px; }
      .hero-grid, .split, .scene-panel.is-on, .dark-inner, .compare, .cta-box, .foot-grid { grid-template-columns: 1fr; }
      .metric-grid, .adv-grid, .mod-grid, .story-grid, .review-grid, .news-grid { grid-template-columns: 1fr 1fr; }
      .flow, .g-grid, .stats-row { grid-template-columns: 1fr 1fr; }
      .nav-links { display: none; }
      .menu-toggle { display: inline-flex; }
      .band { padding: var(--space-lg) 0; }
      .hero, .hero-grid { min-height: 760px; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 30px; }
      .container { width: min(1240px, calc(100% - 28px)); }
      .nav-top { overflow-x: auto; }
      .nav-top .container { min-width: 640px; }
      .metric-grid, .adv-grid, .mod-grid, .story-grid, .review-grid, .news-grid, .flow, .g-grid, .stats-row, .compare { grid-template-columns: 1fr; }
      .hero { clip-path: none; margin-bottom: 0; min-height: auto; }
      .hero-grid { min-height: auto; padding: 36px 0 88px; }
      .carousel-nav { bottom: 18px; }
      .logo-text span { display: none; }
      .band { padding: var(--space-md) 0; }
    }
    @media (max-width: 520px) {
      h1 { font-size: 28px; }
      h2 { font-size: 24px; }
      .btn { width: 100%; }
      .hero .badge-row .data-badge { min-width: calc(50% - 6px); }
      .dock .hide-sm { display: none; }
    }