/* roulang page: index */
:root {
      --c-ink: #141414;
      --c-carbon: #111111;
      --c-cyan: #1aa6a6;
      --c-cyan-d: #0e7c7c;
      --c-copper: #b87333;
      --c-amber: #c47b17;
      --c-bg: #f4f1ec;
      --c-paper: #ebe6de;
      --c-sheet: #fbfaf7;
      --c-text: #1c1b19;
      --c-muted: #5e5a53;
      --c-line: rgba(20, 20, 20, 0.12);
      --c-line-strong: rgba(20, 20, 20, 0.22);
      --c-hair-cyan: rgba(26, 166, 166, 0.42);
      --c-hair-copper: rgba(184, 115, 51, 0.5);
      --radius: 6px;
      --radius-sm: 4px;
      --radius-btn: 2px;
      --shadow: 0 10px 28px rgba(20, 20, 20, 0.06);
      --container: 1240px;
      --gutter: 24px;
      --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
      --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
      --mono: "SFMono-Regular", "Menlo", "Consolas", "IBM Plex Mono", ui-monospace, monospace;
      --space-section: 120px;
      --header-top: 36px;
      --header-main: 64px;
      --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    html, body { margin: 0; padding: 0; }
    body {
      font-family: var(--sans);
      font-size: 16px;
      line-height: 1.75;
      color: var(--c-text);
      background: var(--c-bg);
      overflow-x: hidden;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { color: inherit; text-decoration: none; }
    a:hover { color: var(--c-cyan-d); }
    button, input, select, textarea { font-family: inherit; font-size: inherit; }
    button { cursor: pointer; }
    h1, h2, h3, h4 { font-family: var(--serif); font-weight: 650; letter-spacing: -0.02em; color: var(--c-ink); margin: 0; }
    p { margin: 0; }
    ul, ol, dl { margin: 0; padding: 0; }
    :focus-visible {
      outline: 2px solid var(--c-cyan);
      outline-offset: 3px;
    }
    .skip {
      position: absolute;
      left: -999px;
      top: 0;
      background: var(--c-ink);
      color: #fff;
      padding: 8px 14px;
      z-index: 10000;
    }
    .skip:focus { left: 12px; top: 12px; }
    .container {
      width: min(var(--container), calc(100% - 48px));
      margin-inline: auto;
    }
    .num {
      font-family: var(--mono);
      font-variant-numeric: tabular-nums;
      letter-spacing: 0;
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 12px;
      letter-spacing: 0.08em;
      text-transform: none;
      color: var(--c-copper);
      font-family: var(--mono);
    }
    .eyebrow::before {
      content: "";
      width: 18px;
      height: 1px;
      background: var(--c-copper);
    }
    .section {
      padding: var(--space-section) 0;
      position: relative;
    }
    .section + .section { border-top: 1px solid var(--c-line); }
    .section-head {
      display: grid;
      grid-template-columns: 88px 1fr minmax(0, 420px);
      gap: 24px 32px;
      align-items: end;
      margin-bottom: 56px;
    }
    .section-index {
      font-family: var(--mono);
      font-size: 13px;
      color: var(--c-cyan-d);
      letter-spacing: 0.12em;
      padding-bottom: 10px;
      border-bottom: 1px solid var(--c-hair-cyan);
      align-self: start;
    }
    .section-head h2 {
      font-size: clamp(28px, 3vw, 36px);
      line-height: 1.22;
    }
    .section-lead {
      color: var(--c-muted);
      font-size: 15px;
      line-height: 1.8;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 44px;
      padding: 0 20px;
      border-radius: var(--radius-btn);
      border: 1px solid var(--c-ink);
      background: var(--c-ink);
      color: var(--c-sheet);
      letter-spacing: 0.04em;
      transition: background 240ms var(--ease), color 240ms var(--ease), border-color 240ms var(--ease), transform 240ms var(--ease);
      text-decoration: none;
      gap: 8px;
    }
    .btn:hover, .btn:active {
      background: transparent;
      color: var(--c-ink);
      border-color: var(--c-copper);
    }
    .btn-ghost {
      background: transparent;
      color: var(--c-ink);
      border-color: var(--c-line-strong);
    }
    .btn-ghost:hover {
      border-color: var(--c-cyan);
      color: var(--c-cyan-d);
      background: transparent;
    }
    .btn-light {
      background: var(--c-sheet);
      color: var(--c-ink);
      border-color: var(--c-sheet);
    }
    .btn-light:hover {
      background: transparent;
      color: var(--c-sheet);
      border-color: var(--c-copper);
    }
    .btn-ink {
      background: none;
      border: none;
      color: var(--c-sheet);
      min-height: 44px;
      padding: 0;
      position: relative;
      border-radius: 0;
    }
    .btn-ink::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 6px;
      width: 0;
      height: 1px;
      background: var(--c-cyan);
      transition: width 280ms var(--ease);
    }
    .btn-ink:hover { color: var(--c-cyan); background: none; border: none; }
    .btn-ink:hover::after { width: 100%; }
    .badge {
      display: inline-flex;
      align-items: center;
      min-height: 28px;
      padding: 0 10px;
      border: 1px solid var(--c-hair-copper);
      color: var(--c-copper);
      font-size: 12px;
      font-family: var(--mono);
      border-radius: 2px;
      letter-spacing: 0.04em;
    }
    .hair { height: 1px; background: var(--c-line); border: 0; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(251, 250, 247, 0.94);
      border-bottom: 1px solid var(--c-line);
      transition: box-shadow 240ms var(--ease);
    }
    .site-header.is-compact { box-shadow: var(--shadow); }
    .nav-tool {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: var(--header-top);
      font-size: 12px;
      color: var(--c-muted);
      border-bottom: 1px solid var(--c-line);
      overflow: hidden;
      transition: height 280ms var(--ease), opacity 280ms var(--ease);
    }
    .nav-tool-left, .nav-tool-right {
      display: flex;
      align-items: center;
      gap: 18px;
      min-height: 44px;
    }
    .lock {
      color: var(--c-ink);
      font-family: var(--mono);
      letter-spacing: 0.08em;
    }
    .lock i {
      display: inline-block;
      width: 7px;
      height: 7px;
      border: 1px solid var(--c-cyan);
      margin-right: 8px;
      transform: rotate(45deg);
      vertical-align: 1px;
    }
    .nav-tool a { color: var(--c-muted); }
    .nav-tool a:hover { color: var(--c-cyan-d); }
    .cta-mini {
      min-height: 28px;
      padding: 0 12px;
      border: 1px solid var(--c-ink);
      color: var(--c-ink);
      font-size: 12px;
      letter-spacing: 0.06em;
      display: inline-flex;
      align-items: center;
      transition: background 220ms var(--ease), color 220ms var(--ease);
    }
    .cta-mini:hover { background: var(--c-ink); color: var(--c-sheet); }
    .nav-main {
      height: var(--header-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--c-ink);
      min-height: 44px;
      flex-shrink: 0;
    }
    .logo-mark {
      width: 28px;
      height: 28px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3px;
    }
    .logo-mark span {
      border: 1px solid var(--c-ink);
    }
    .logo-mark span:nth-child(1) { background: var(--c-ink); }
    .logo-mark span:nth-child(4) { border-color: var(--c-cyan); }
    .logo-text {
      font-family: var(--serif);
      font-size: 20px;
      font-weight: 700;
      letter-spacing: 0.02em;
      line-height: 1;
    }
    .logo-sub {
      display: block;
      margin-top: 4px;
      font-family: var(--mono);
      font-size: 10px;
      color: var(--c-muted);
      letter-spacing: 0.14em;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 4px 18px;
    }
    .nav-links a {
      position: relative;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      color: var(--c-text);
      font-size: 14px;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 10px;
      width: 0;
      height: 1px;
      background: var(--c-cyan);
      transition: width 240ms var(--ease);
    }
    .nav-links a:hover, .nav-links a.is-active { color: var(--c-ink); }
    .nav-links a:hover::after, .nav-links a.is-active::after { width: 100%; }
    .nav-phone-m, .nav-toggle { display: none; }
    .nav-toggle {
      width: 44px;
      height: 44px;
      border: 1px solid var(--c-line-strong);
      background: transparent;
      position: relative;
    }
    .nav-toggle span, .nav-toggle::before, .nav-toggle::after {
      content: "";
      position: absolute;
      left: 11px;
      right: 11px;
      height: 1px;
      background: var(--c-ink);
    }
    .nav-toggle::before { top: 15px; }
    .nav-toggle span { top: 21px; display: block; }
    .nav-toggle::after { bottom: 15px; }
    .drawer-backdrop {
      position: fixed;
      inset: 0;
      background: rgba(20, 20, 20, 0.35);
      opacity: 0;
      pointer-events: none;
      transition: opacity 240ms var(--ease);
      z-index: 1100;
    }
    .drawer {
      position: fixed;
      top: 0;
      right: 0;
      width: min(86vw, 360px);
      height: 100%;
      background: var(--c-sheet);
      border-left: 1px solid var(--c-line);
      transform: translateX(100%);
      transition: transform 320ms var(--ease);
      z-index: 1200;
      padding: 28px 24px 40px;
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    body.nav-open .drawer { transform: none; }
    body.nav-open .drawer-backdrop { opacity: 1; pointer-events: auto; }
    .drawer a {
      min-height: 44px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--c-line);
      font-size: 16px;
    }
    .drawer-close {
      align-self: flex-end;
      width: 44px;
      height: 44px;
      border: 1px solid var(--c-line-strong);
      background: none;
    }
    .site-header.is-compact .nav-tool {
      height: 0;
      opacity: 0;
      border-bottom-width: 0;
      min-height: 0;
    }
    .site-header.is-compact .nav-main { height: 56px; }
    .site-header.is-compact .logo-text { font-size: 18px; }
    .hero {
      position: relative;
      min-height: min(88vh, 820px);
      color: var(--c-sheet);
      overflow: hidden;
      background: var(--c-carbon);
    }
    .hero-slides { position: absolute; inset: 0; }
    .hero-slide {
      position: absolute;
      inset: 0;
      opacity: 0;
      transition: opacity 420ms var(--ease);
    }
    .hero-slide.is-active { opacity: 1; z-index: 1; }
    .hero-slide img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      filter: saturate(0.72) contrast(1.05);
      transform: scale(1);
    }
    .hero-slide.is-active img { animation: kenburns 18s linear forwards; }
    .hero::after {
      content: "";
      position: absolute;
      inset: 0;
      background:
        linear-gradient(90deg, rgba(10, 10, 10, 0.82) 0%, rgba(10, 10, 10, 0.55) 42%, rgba(10, 10, 10, 0.28) 100%),
        linear-gradient(180deg, rgba(10, 10, 10, 0.2), rgba(10, 10, 10, 0.55));
      z-index: 2;
      pointer-events: none;
    }
    .hero-copy {
      position: relative;
      z-index: 3;
      padding: 88px 0 210px;
      max-width: 760px;
    }
    .hero-copy h1 {
      color: var(--c-sheet);
      font-size: clamp(32px, 5vw, 60px);
      line-height: 1.18;
      margin: 14px 0 18px;
    }
    .hero-lead {
      font-size: 16px;
      line-height: 1.85;
      color: rgba(251, 250, 247, 0.82);
      max-width: 640px;
      margin-bottom: 28px;
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-frame {
      margin-top: 22px;
      font-family: var(--mono);
      font-size: 12px;
      color: var(--c-cyan);
      min-height: 18px;
    }
    .window-bar {
      margin-top: 26px;
      display: inline-flex;
      align-items: center;
      gap: 12px;
      border: 1px solid var(--c-hair-cyan);
      padding: 8px 12px;
      min-height: 44px;
      font-size: 13px;
      color: rgba(251, 250, 247, 0.9);
    }
    .window-bar b { color: var(--c-copper); font-weight: 600; font-family: var(--mono); }
    .hero-roadmap {
      position: absolute;
      left: 0;
      right: 0;
      bottom: 0;
      z-index: 4;
      border-top: 1px solid rgba(26, 166, 166, 0.28);
      background: rgba(12, 12, 12, 0.72);
    }
    .roadmap-row {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 20px;
      align-items: center;
      min-height: 92px;
      padding: 12px 0;
    }
    .nodes {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 8px;
    }
    .node {
      padding: 6px 8px 6px 0;
      border-left: 1px solid var(--c-hair-cyan);
      padding-left: 12px;
    }
    .node small {
      display: block;
      font-family: var(--mono);
      color: var(--c-cyan);
      font-size: 11px;
      margin-bottom: 4px;
    }
    .node span {
      display: block;
      color: var(--c-sheet);
      font-size: 13px;
      line-height: 1.45;
    }
    .hero-controls {
      position: absolute;
      right: max(24px, calc((100% - var(--container)) / 2));
      top: 88px;
      z-index: 5;
      display: flex;
      flex-direction: column;
      gap: 10px;
      align-items: flex-end;
    }
    .dots { display: flex; gap: 8px; }
    .dot, .play-toggle {
      width: 44px;
      height: 44px;
      border: 1px solid rgba(251, 250, 247, 0.35);
      background: transparent;
      color: var(--c-sheet);
      display: grid;
      place-items: center;
      padding: 0;
    }
    .dot { width: 12px; height: 12px; border-radius: 50%; min-height: 12px; }
    .dot.is-active { background: var(--c-cyan); border-color: var(--c-cyan); }
    .issue { background: var(--c-sheet); }
    .issue-grid {
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 56px;
      align-items: center;
    }
    .media {
      position: relative;
      overflow: hidden;
      border: 1px solid var(--c-line);
      border-radius: var(--radius);
      aspect-ratio: 16 / 10;
    }
    .media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 360ms var(--ease);
    }
    .media:hover img { transform: scale(1.03); }
    .spec-list { display: grid; gap: 0; }
    .spec-list div {
      display: grid;
      grid-template-columns: 108px 1fr;
      gap: 16px;
      padding: 14px 0;
      border-bottom: 1px solid var(--c-line);
    }
    .spec-list dt {
      font-family: var(--mono);
      font-size: 12px;
      color: var(--c-cyan-d);
      padding-top: 4px;
    }
    .spec-list dd { color: var(--c-text); }
    .issue-copy h2 { margin: 10px 0 16px; font-size: clamp(28px, 3vw, 36px); line-height: 1.22; }
    .issue-copy .lead { color: var(--c-muted); margin-bottom: 22px; }
    .kpi {
      background: var(--c-paper);
      padding: 0;
    }
    .kpi-board {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      border-top: 1px solid var(--c-line);
      border-bottom: 1px solid var(--c-line);
    }
    .kpi-item {
      padding: 36px 22px;
      border-right: 1px solid var(--c-line);
    }
    .kpi-item:last-child { border-right: 0; }
    .kpi-item b {
      display: block;
      font-family: var(--mono);
      font-size: clamp(28px, 3vw, 40px);
      line-height: 1.1;
      color: var(--c-ink);
      font-weight: 500;
    }
    .kpi-item b em {
      font-style: normal;
      font-size: 14px;
      margin-left: 4px;
      color: var(--c-cyan-d);
    }
    .kpi-item span {
      display: block;
      margin-top: 10px;
      color: var(--c-muted);
      font-size: 13px;
      line-height: 1.6;
    }
    .matrix { background: var(--c-bg); }
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1px;
      background: var(--c-line);
      border: 1px solid var(--c-line);
    }
    .matrix-card {
      background: var(--c-sheet);
      padding: 28px 24px 24px;
      min-height: 240px;
      transition: border-color 240ms var(--ease), transform 240ms var(--ease);
      border: 1px solid transparent;
    }
    .matrix-card:hover {
      border-color: var(--c-cyan);
      z-index: 1;
    }
    .matrix-card:hover h3 { transform: translateX(4px); }
    .icon-line {
      width: 36px;
      height: 36px;
      margin-bottom: 18px;
      color: var(--c-ink);
    }
    .matrix-card h3 {
      font-size: 20px;
      margin-bottom: 8px;
      transition: transform 240ms var(--ease);
    }
    .matrix-card p { color: var(--c-muted); font-size: 14px; margin-bottom: 16px; }
    .params {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .params span {
      font-family: var(--mono);
      font-size: 11px;
      color: var(--c-ink);
      border: 1px solid var(--c-line);
      padding: 4px 8px;
    }
    .demo { background: var(--c-sheet); }
    .demo-layout {
      display: grid;
      grid-template-columns: 0.9fr 1.1fr;
      gap: 48px;
      align-items: stretch;
    }
    .steps { display: grid; gap: 0; }
    .step {
      display: grid;
      grid-template-columns: 64px 1fr;
      gap: 16px;
      padding: 18px 0;
      border-bottom: 1px solid var(--c-line);
      cursor: pointer;
      text-align: left;
      background: none;
      border-left: 0;
      border-right: 0;
      border-top: 0;
      width: 100%;
      color: inherit;
    }
    .step.is-on { border-bottom-color: var(--c-cyan); }
    .step b {
      font-family: var(--mono);
      color: var(--c-cyan-d);
      font-size: 13px;
      font-weight: 500;
    }
    .step h3 { font-size: 18px; margin-bottom: 6px; }
    .step p { color: var(--c-muted); font-size: 14px; }
    .demo-stage { position: relative; }
    .demo-stage .media { height: 100%; min-height: 360px; }
    .demo-caption {
      position: absolute;
      left: 16px;
      bottom: 16px;
      background: rgba(20, 20, 20, 0.82);
      color: var(--c-sheet);
      padding: 10px 12px;
      font-size: 12px;
      font-family: var(--mono);
    }
    .products { background: var(--c-paper); }
    .product-grid {
      display: grid;
      grid-template-columns: 1.25fr 1fr 1fr;
      gap: 18px;
    }
    .product-card {
      background: var(--c-sheet);
      border: 1px solid var(--c-line);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: border-color 240ms var(--ease);
    }
    .product-card:hover { border-color: var(--c-cyan); }
    .product-card:hover h3 { transform: translateX(3px); }
    .product-card .media { border: 0; border-radius: 0; aspect-ratio: 16 / 10; }
    .product-body { padding: 22px 22px 24px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
    .product-body h3 { font-size: 22px; transition: transform 240ms var(--ease); }
    .product-body ul { list-style: none; color: var(--c-muted); font-size: 14px; }
    .product-body li { padding: 5px 0 5px 14px; position: relative; }
    .product-body li::before {
      content: "";
      width: 6px;
      height: 1px;
      background: var(--c-copper);
      position: absolute;
      left: 0;
      top: 14px;
    }
    .product-body .btn { align-self: flex-start; margin-top: auto; }
    .compare { background: var(--c-sheet); }
    .table-wrap { overflow-x: auto; border: 1px solid var(--c-line); }
    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 720px;
    }
    th, td {
      text-align: left;
      padding: 16px 18px;
      vertical-align: top;
      font-size: 14px;
      line-height: 1.7;
    }
    thead th {
      background: var(--c-ink);
      color: var(--c-sheet);
      font-weight: 500;
      font-family: var(--serif);
      font-size: 16px;
    }
    tbody tr:nth-child(odd) { background: var(--c-sheet); }
    tbody tr:nth-child(even) { background: #f3efe8; }
    td:first-child {
      font-family: var(--mono);
      font-size: 13px;
      color: var(--c-cyan-d);
      white-space: nowrap;
      width: 110px;
    }
    .stuck { background: var(--c-bg); }
    .stuck-grid {
      display: grid;
      grid-template-columns: 280px 1fr;
      gap: 48px;
    }
    .stuck-list { display: grid; gap: 1px; background: var(--c-line); border: 1px solid var(--c-line); }
    .stuck-item {
      background: var(--c-sheet);
      padding: 20px 22px;
      display: grid;
      grid-template-columns: 72px 1fr;
      gap: 16px;
      border: 1px solid transparent;
      transition: border-color 240ms var(--ease);
    }
    .stuck-item:hover { border-color: var(--c-cyan); }
    .stuck-item strong { font-family: var(--mono); color: var(--c-copper); font-size: 13px; }
    .stuck-item h3 { font-size: 18px; margin-bottom: 6px; }
    .stuck-item p { color: var(--c-muted); font-size: 14px; }
    .cases {
      background: var(--c-carbon);
      color: var(--c-sheet);
      border-top: 1px solid var(--c-hair-cyan);
      border-bottom: 1px solid var(--c-hair-copper);
    }
    .cases h2, .cases .section-head h2 { color: var(--c-sheet); }
    .cases .section-lead { color: rgba(251, 250, 247, 0.7); }
    .cases .section-index { color: var(--c-cyan); border-bottom-color: var(--c-hair-cyan); }
    .quote-xl {
      font-family: var(--serif);
      font-size: clamp(22px, 3vw, 32px);
      line-height: 1.45;
      border-left: 2px solid var(--c-copper);
      padding-left: 22px;
      margin-bottom: 48px;
      max-width: 920px;
    }
    .case-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr 1fr;
      gap: 16px;
    }
    .case-card {
      border: 1px solid rgba(251, 250, 247, 0.14);
      overflow: hidden;
    }
    .case-card img {
      width: 100%;
      aspect-ratio: 16 / 10;
      object-fit: cover;
      filter: saturate(0.55) contrast(1.05);
    }
    .case-card div { padding: 18px 18px 22px; }
    .case-card h3 { color: var(--c-sheet); font-size: 18px; margin-bottom: 8px; }
    .case-card p { color: rgba(251, 250, 247, 0.7); font-size: 14px; }
    .milestones { background: var(--c-sheet); }
    .timeline {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 0;
      position: relative;
    }
    .timeline::before {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      top: 18px;
      height: 1px;
      background: var(--c-line-strong);
    }
    .tl {
      padding: 0 16px 0 0;
      position: relative;
    }
    .tl i {
      display: block;
      width: 9px;
      height: 9px;
      background: var(--c-sheet);
      border: 1px solid var(--c-cyan);
      transform: rotate(45deg);
      margin-bottom: 22px;
      position: relative;
      z-index: 1;
    }
    .tl time {
      display: block;
      font-family: var(--mono);
      color: var(--c-copper);
      font-size: 12px;
      margin-bottom: 8px;
    }
    .tl h3 { font-size: 18px; margin-bottom: 8px; }
    .tl p { color: var(--c-muted); font-size: 14px; }
    .social { background: var(--c-paper); }
    .stat-bar {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      border: 1px solid var(--c-line);
      background: var(--c-sheet);
      margin-bottom: 48px;
    }
    .stat-bar div {
      padding: 24px 18px;
      border-right: 1px solid var(--c-line);
    }
    .stat-bar div:last-child { border-right: 0; }
    .stat-bar b {
      font-family: var(--mono);
      font-size: 28px;
      display: block;
      color: var(--c-ink);
    }
    .stat-bar b em { font-style: normal; font-size: 13px; color: var(--c-cyan-d); margin-left: 4px; }
    .stat-bar span { color: var(--c-muted); font-size: 13px; }
    .quotes {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .quote-card {
      border: 1px solid var(--c-line);
      background: var(--c-sheet);
      padding: 28px 24px;
    }
    .quote-card q {
      display: block;
      quotes: none;
      font-family: var(--serif);
      font-size: 18px;
      line-height: 1.65;
      color: var(--c-ink);
      margin-bottom: 18px;
    }
    .quote-card q::before { content: "“"; color: var(--c-copper); font-size: 28px; margin-right: 4px; }
    .quote-card footer { color: var(--c-muted); font-size: 13px; font-family: var(--mono); }
    .news { background: var(--c-bg); }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .news-card {
      background: var(--c-sheet);
      border: 1px solid var(--c-line);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: border-color 240ms var(--ease);
    }
    .news-card:hover { border-color: var(--c-cyan); }
    .news-card:hover h3 { transform: translateX(3px); }
    .news-card .media { border: 0; border-radius: 0; }
    .news-card div { padding: 18px 18px 22px; }
    .news-card time { font-family: var(--mono); font-size: 12px; color: var(--c-copper); }
    .news-card h3 { font-size: 18px; margin: 8px 0; line-height: 1.4; transition: transform 240ms var(--ease); }
    .news-card p { color: var(--c-muted); font-size: 14px; }
    .more-row { margin-top: 28px; }
    .quality { background: var(--c-sheet); }
    .quality-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 0;
      border: 1px solid var(--c-line);
    }
    .quality-item {
      padding: 28px 22px;
      border-right: 1px solid var(--c-line);
    }
    .quality-item:last-child { border-right: 0; }
    .quality-item h3 { font-size: 18px; margin: 12px 0 8px; }
    .quality-item p { color: var(--c-muted); font-size: 14px; }
    .check {
      width: 16px;
      height: 16px;
      border: 1px solid var(--c-cyan);
      display: grid;
      place-items: center;
    }
    .check::after {
      content: "";
      width: 8px;
      height: 4px;
      border-left: 1px solid var(--c-cyan);
      border-bottom: 1px solid var(--c-cyan);
      transform: rotate(-45deg) translateY(-1px);
    }
    .scenes { background: var(--c-paper); }
    .scene-band {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .scene-band.reverse { grid-template-columns: 0.85fr 1.15fr; }
    .scene-band.reverse .scene-copy { order: -1; }
    .scene-copy h3 { font-size: 26px; margin: 8px 0 14px; }
    .scene-copy p { color: var(--c-muted); margin-bottom: 18px; }
    .dl div {
      display: grid;
      grid-template-columns: 96px 1fr;
      gap: 12px;
      padding: 10px 0;
      border-bottom: 1px solid var(--c-line);
      font-size: 14px;
    }
    .dl dt { font-family: var(--mono); color: var(--c-cyan-d); font-size: 12px; padding-top: 3px; }
    .scene-stack { display: grid; gap: 56px; }
    .faq { background: var(--c-sheet); }
    .qtags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-bottom: 28px;
    }
    .qtag {
      min-height: 44px;
      padding: 0 14px;
      border: 1px solid var(--c-line-strong);
      background: transparent;
      color: var(--c-ink);
      border-radius: 2px;
      transition: border-color 220ms var(--ease), color 220ms var(--ease);
    }
    .qtag:hover, .qtag:focus { border-color: var(--c-cyan); color: var(--c-cyan-d); }
    .faq-list { border-top: 1px solid var(--c-line); }
    .faq-item { border-bottom: 1px solid var(--c-line); }
    .faq-item button {
      width: 100%;
      min-height: 64px;
      text-align: left;
      background: none;
      border: 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 16px 0;
      font-family: var(--serif);
      font-size: 18px;
      color: var(--c-ink);
    }
    .faq-item button span.plus {
      font-family: var(--mono);
      color: var(--c-cyan-d);
      flex: 0 0 24px;
    }
    .faq-panel {
      display: grid;
      grid-template-rows: 0fr;
      transition: grid-template-rows 280ms var(--ease);
    }
    .faq-panel > div { overflow: hidden; }
    .faq-item.is-open .faq-panel { grid-template-rows: 1fr; }
    .faq-panel p {
      color: var(--c-muted);
      padding: 0 0 20px;
      max-width: 860px;
    }
    .consult {
      background:
        linear-gradient(180deg, rgba(20, 20, 20, 0.82), rgba(20, 20, 20, 0.88)),
        url("/assets/images/623f29a47af93c60.webp") center/cover no-repeat;
      color: var(--c-sheet);
      border-top: 1px solid var(--c-hair-cyan);
    }
    .consult h2 { color: var(--c-sheet); }
    .consult .section-lead { color: rgba(251, 250, 247, 0.74); }
    .consult .section-index { color: var(--c-cyan); }
    .consult-grid {
      display: grid;
      grid-template-columns: 0.85fr 1.15fr;
      gap: 48px;
      align-items: start;
    }
    .consult-note p { margin-bottom: 16px; color: rgba(251, 250, 247, 0.78); }
    .consult-note ul { list-style: none; }
    .consult-note li {
      padding: 8px 0 8px 16px;
      position: relative;
      color: rgba(251, 250, 247, 0.82);
    }
    .consult-note li::before {
      content: "";
      width: 7px;
      height: 1px;
      background: var(--c-copper);
      position: absolute;
      left: 0;
      top: 18px;
    }
    form {
      background: var(--c-sheet);
      color: var(--c-text);
      border: 1px solid rgba(251, 250, 247, 0.12);
      padding: 28px;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px 18px;
    }
    label { display: block; font-size: 13px; margin-bottom: 6px; color: var(--c-ink); }
    label i { color: var(--c-amber); font-style: normal; margin-left: 4px; }
    input, select, textarea {
      width: 100%;
      min-height: 44px;
      border: 1px solid var(--c-line-strong);
      background: #fff;
      padding: 8px 12px;
      color: var(--c-text);
      border-radius: var(--radius-sm);
      transition: border-color 180ms var(--ease);
    }
    textarea { min-height: 110px; resize: vertical; }
    input:focus, select:focus, textarea:focus {
      outline: none;
      border-color: var(--c-cyan);
      box-shadow: 0 0 0 2px rgba(26, 166, 166, 0.18);
    }
    .field.error input, .field.error select, .field.error textarea { border-color: var(--c-amber); }
    .field .err {
      display: none;
      color: var(--c-amber);
      font-size: 12px;
      margin-top: 6px;
    }
    .field.error .err { display: block; }
    .form-full { grid-column: 1 / -1; }
    .form-actions {
      grid-column: 1 / -1;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 8px;
    }
    .form-success {
      display: none;
      grid-column: 1 / -1;
      border: 1px solid var(--c-hair-cyan);
      padding: 12px 14px;
      color: var(--c-cyan-d);
      background: #f3fbfb;
    }
    .form-success.is-on { display: block; }
    .site-footer {
      background: var(--c-ink);
      color: rgba(251, 250, 247, 0.78);
      padding: 64px 0 28px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.3fr 1fr 1fr 1.1fr;
      gap: 32px;
      margin-bottom: 40px;
    }
    .site-footer h3 {
      color: var(--c-sheet);
      font-size: 16px;
      margin-bottom: 16px;
    }
    .site-footer a { color: rgba(251, 250, 247, 0.78); display: inline-flex; min-height: 36px; align-items: center; }
    .site-footer a:hover { color: var(--c-cyan); }
    .foot-brand .logo-text { color: var(--c-sheet); }
    .foot-brand p { margin-top: 14px; font-size: 14px; max-width: 280px; }
    .foot-legal { font-size: 13px; line-height: 1.9; }
    .copyright {
      border-top: 1px solid rgba(251, 250, 247, 0.12);
      padding-top: 18px;
      font-size: 12px;
      color: rgba(251, 250, 247, 0.5);
      display: flex;
      flex-wrap: wrap;
      gap: 8px 18px;
      justify-content: space-between;
    }
    @keyframes kenburns {
      from { transform: scale(1.0); }
      to { transform: scale(1.06); }
    }
    @keyframes fadeup {
      from { opacity: 0; transform: translateY(10px); }
      to { opacity: 1; transform: none; }
    }
    .hero-copy { animation: fadeup 420ms var(--ease) both; }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after {
        animation: none !important;
        transition: none !important;
      }
    }
    @media (max-width: 1440px) {
      .hero-controls { right: 24px; }
    }
    @media (max-width: 1024px) {
      :root { --space-section: 88px; }
      .section-head { grid-template-columns: 72px 1fr; }
      .section-lead { grid-column: 1 / -1; }
      .kpi-board { grid-template-columns: repeat(3, 1fr); }
      .kpi-item:nth-child(3) { border-right: 0; }
      .kpi-item:nth-child(n+4) { border-top: 1px solid var(--c-line); }
      .matrix-grid, .news-grid, .quotes, .case-grid { grid-template-columns: 1fr 1fr; }
      .product-grid { grid-template-columns: 1fr 1fr; }
      .product-grid .product-card:first-child { grid-column: 1 / -1; }
      .quality-grid { grid-template-columns: 1fr 1fr; }
      .quality-item:nth-child(2n) { border-right: 0; }
      .quality-item:nth-child(n+3) { border-top: 1px solid var(--c-line); }
      .stat-bar { grid-template-columns: 1fr 1fr; }
      .stat-bar div:nth-child(2n) { border-right: 0; }
      .stat-bar div:nth-child(n+3) { border-top: 1px solid var(--c-line); }
      .stuck-grid, .issue-grid, .demo-layout, .consult-grid, .scene-band, .scene-band.reverse {
        grid-template-columns: 1fr;
      }
      .scene-band.reverse .scene-copy { order: 0; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .nodes { grid-template-columns: 1fr 1fr; }
      .timeline { grid-template-columns: 1fr 1fr; gap: 28px 16px; }
      .timeline::before { display: none; }
      .nav-links { display: none; }
      .nav-phone-m, .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
      .nav-phone-m {
        min-height: 44px;
        padding: 0 10px;
        color: var(--c-ink);
        font-family: var(--mono);
        font-size: 13px;
      }
    }
    @media (max-width: 768px) {
      :root { --space-section: 72px; }
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-tool-right span:nth-child(2), .nav-tool-right span:nth-child(3) { display: none; }
      .hero-copy { padding: 56px 0 240px; }
      .hero-copy h1 { font-size: 34px; }
      .roadmap-row { grid-template-columns: 1fr; }
      .hero-controls { top: auto; bottom: 210px; flex-direction: row; }
      .kpi-board { grid-template-columns: 1fr 1fr; }
      .kpi-item { border-right: 1px solid var(--c-line); }
      .kpi-item:nth-child(2n) { border-right: 0; }
      .kpi-item:nth-child(n+3) { border-top: 1px solid var(--c-line); }
      .matrix-grid, .news-grid, .quotes, .case-grid, .product-grid { grid-template-columns: 1fr; }
      .product-grid .product-card:first-child { grid-column: auto; }
      .form-grid { grid-template-columns: 1fr; }
      .quality-grid { grid-template-columns: 1fr; }
      .quality-item { border-right: 0; border-bottom: 1px solid var(--c-line); }
      .spec-list div, .dl div { grid-template-columns: 1fr; gap: 4px; }
      .footer-grid { grid-template-columns: 1fr; }
      .timeline { grid-template-columns: 1fr; }
    }
    @media (max-width: 520px) {
      .hero-copy h1 { font-size: 32px; }
      .window-bar { display: flex; flex-wrap: wrap; }
      .nodes { grid-template-columns: 1fr; }
      .hero { min-height: 100vh; }
      .nav-phone-m { display: none; }
      .stat-bar { grid-template-columns: 1fr; }
      .stat-bar div { border-right: 0; border-bottom: 1px solid var(--c-line); }
      .stuck-item { grid-template-columns: 1fr; }
    }