/* Stylesheet for frontend/zh-TW/index.html */
    :root {
      --bg: #f7f5f2;
      --bg-card: #ffffff;
      --bg-soft: #eef6f4;
      --ink: #16202e;
      --ink-soft: #5c6b7a;
      --accent: #2d9c8a;
      --accent-light: #d4f0eb;
      --accent-dark: #1f7a6c;
      --warm: #e8a87c;
      --warm-light: #fdf0e8;
      --line: #e2e6ea;
      --shadow: 0 4px 24px rgba(22, 32, 46, 0.06);
      --shadow-lg: 0 24px 64px rgba(22, 32, 46, 0.12);
      --font-display: 'Outfit', 'Noto Sans SC', sans-serif;
      --font-body: 'Noto Sans SC', sans-serif;
    }

    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      background: var(--bg);
      color: var(--ink);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    body.menu-open {
      overflow: hidden;
      height: 100vh;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    .container {
      width: min(1180px, 92vw);
      margin: 0 auto;
    }

    /* Scroll reveal */
    .reveal {
      opacity: 0;
      transform: translateY(32px);
      transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* Floating pill nav */
    .nav-wrap {
      position: fixed;
      top: 20px;
      left: 0;
      right: 0;
      z-index: 100;
      display: flex;
      justify-content: center;
      padding: 0 4vw;
      pointer-events: none;
    }

    .nav-pill {
      pointer-events: auto;
      display: flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 255, 255, 0.78);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.9);
      box-shadow: 0 8px 32px rgba(22, 32, 46, 0.1);
      border-radius: 999px;
      padding: 8px 10px 8px 18px;
      width: min(880px, 100%);
      justify-content: space-between;
      transition: box-shadow 0.3s;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-display);
      font-weight: 700;
      font-size: 1.2rem;
      letter-spacing: -0.02em;
      flex-shrink: 0;
    }

    .logo-mark {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    .logo-mark img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 4px;
      list-style: none;
    }

    .nav-links a {
      font-size: 0.88rem;
      font-weight: 500;
      color: var(--ink-soft);
      padding: 8px 16px;
      border-radius: 999px;
      transition: all 0.2s;
    }

    .nav-links a:hover {
      color: var(--accent-dark);
      background: var(--accent-light);
    }

    .nav-links a.active {
      color: #fff;
      background: var(--ink);
    }

    .nav-right {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .lang-chip {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8rem;
      color: var(--ink-soft);
      padding: 8px 14px;
      border-radius: 999px;
      border: 1px solid var(--line);
      cursor: pointer;
      background: #fff;
    }

    .lang-chip i {
      color: var(--accent);
    }

.lang-switch { position: relative; }

.lang-chip { cursor: pointer; border: none; font-family: inherit; transition: border-color 0.2s, color 0.2s; }
.lang-chip:hover { border-color: var(--accent); color: var(--accent-dark); }

.lang-caret { font-size: 0.6rem; margin-left: 2px; color: var(--ink-soft); transition: transform 0.2s; }
.lang-switch.open .lang-caret { transform: rotate(180deg); }

.lang-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 200px;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 8px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
  z-index: 120;
}

.lang-switch.open .lang-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }

.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: none;
  background: none;
  font-family: var(--font-body);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s;
  text-align: left;
}

.lang-option:hover:not(:disabled) { background: var(--accent-light); }
.lang-option:disabled { color: var(--ink-soft); cursor: not-allowed; opacity: 0.7; }

.lang-flag { font-size: 1rem; line-height: 1; flex-shrink: 0; }
.lang-option-name { flex: 1; }
.lang-check { color: var(--accent); font-size: 0.8rem; flex-shrink: 0; }

.lang-soon {
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 2px 8px;
  border-radius: 999px;
  flex-shrink: 0;
  white-space: nowrap;
}


    .nav-gh {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--ink);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
      transition: transform 0.2s, background 0.2s;
    }

    .nav-gh:hover {
      transform: rotate(-8deg) scale(1.08);
      background: var(--accent-dark);
    }

    .menu-toggle {
      display: none;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      flex-shrink: 0;
      background: none;
      border: none;
      font-size: 1.1rem;
      color: var(--ink);
      cursor: pointer;
      padding: 0;
    }

    .mobile-menu {
      display: none;
    }


    /* Hero — editorial oversized type + network topology */
    .hero {
      position: relative;
      padding: 150px 0 0;
      overflow: hidden;
    }

    .hero-orb {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      opacity: 0.55;
      pointer-events: none;
    }

    .hero-orb.o1 {
      width: 480px;
      height: 480px;
      background: var(--accent-light);
      top: -120px;
      right: -100px;
    }

    .hero-orb.o2 {
      width: 380px;
      height: 380px;
      background: var(--warm-light);
      bottom: 40px;
      left: -140px;
    }

    .hero-inner {
      position: relative;
      z-index: 1;
    }

    .hero-eyebrow {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 28px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 18px;
      border-radius: 999px;
      background: linear-gradient(120deg, var(--accent) 0%, var(--accent-dark) 100%);
      color: #fff;
      font-size: 0.85rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      box-shadow: 0 6px 18px rgba(31, 122, 108, 0.3);
    }

    .hero-badge i {
      font-size: 0.8rem;
    }

    .hero-eyebrow .rule {
      width: 48px;
      height: 1.5px;
      background: var(--accent);
    }

    .hero-eyebrow span:not(.hero-badge) {
      font-size: 0.85rem;
      font-weight: 600;
      letter-spacing: 0.22em;
      color: var(--accent-dark);
    }

    .hero h1 {
      font-family: var(--font-display);
      font-size: clamp(3rem, 8.5vw, 6.8rem);
      font-weight: 800;
      line-height: 1.02;
      letter-spacing: -0.04em;
      max-width: 14em;
    }

    .hero h1 .accent-word {
      background: linear-gradient(120deg, var(--accent) 0%, #3db89e 60%, var(--warm) 110%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero h1 .outline-word {
      color: transparent;
      -webkit-text-stroke: 2px var(--ink);
    }

    .hero-tagline {
      margin-top: 14px;
      font-size: clamp(1rem, 1.4vw, 1.2rem);
      font-weight: 500;
      color: var(--ink-soft);
      letter-spacing: 0.01em;
    }

    .hero-lower {
      display: grid;
      grid-template-columns: minmax(0, 520px) 1fr;
      gap: 48px;
      align-items: end;
      margin-top: 40px;
    }

    .hero-desc {
      font-size: 1.05rem;
      color: var(--ink-soft);
      line-height: 1.9;
      margin-bottom: 30px;
    }

    .hero-desc strong {
      color: var(--ink);
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .btn-major {
      display: inline-flex;
      align-items: center;
      gap: 14px;
      padding: 21px 42px;
      border-radius: 999px;
      background: var(--ink);
      color: #fff;
      font-size: 1.1rem;
      font-weight: 700;
      transition: all 0.25s;
      position: relative;
      overflow: hidden;
      animation: ctaGlow 2.6s ease-in-out infinite;
    }

    @keyframes ctaGlow {
      0%, 100% { box-shadow: 0 10px 26px rgba(31, 122, 108, 0.28); }
      50% { box-shadow: 0 10px 36px rgba(45, 156, 138, 0.5); }
    }

    .btn-major .arr {
      width: 30px;
      height: 30px;
      border-radius: 50%;
      background: var(--accent);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      transition: transform 0.25s;
    }

    .btn-major:hover {
      background: var(--accent-dark);
      transform: translateY(-3px);
      animation-play-state: paused;
      box-shadow: 0 14px 32px rgba(31, 122, 108, 0.4);
    }

    .btn-major:hover .arr {
      transform: translateX(3px);
      background: rgba(255, 255, 255, 0.22);
    }

    .btn-ghost {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 14px 26px;
      border-radius: 999px;
      border: 1.5px solid var(--line);
      color: var(--ink-soft);
      font-size: 0.9rem;
      font-weight: 600;
      transition: all 0.25s;
      background: transparent;
    }

    .btn-ghost:hover {
      background: var(--ink);
      border-color: var(--ink);
      color: #fff;
      transform: translateY(-3px);
    }

    .hero-trust {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-top: 16px;
      font-size: 0.85rem;
      color: var(--ink-soft);
    }

    .hero-trust i {
      color: var(--accent);
    }

    /* Network topology visual */
    .topo-wrap {
      position: relative;
      display: flex;
      justify-content: center;
    }

    .topo-frame {
      position: relative;
      width: 100%;
      max-width: 520px;
    }

    .topo {
      display: block;
      width: 100%;
      height: auto;
    }

    .topo .link {
      stroke: var(--accent);
      stroke-width: 1.5;
      stroke-dasharray: 6 8;
      opacity: 0.5;
      animation: dashflow 2.8s linear infinite;
    }

    .topo .link.warm-link {
      stroke: var(--warm);
    }

    @keyframes dashflow {
      to { stroke-dashoffset: -56; }
    }

    .topo .node-ring {
      fill: none;
      stroke: var(--accent);
      opacity: 0.25;
      animation: ringpulse 3s ease-out infinite;
      transform-origin: center;
    }

    @keyframes ringpulse {
      0% { opacity: 0.4; }
      70% { opacity: 0; }
      100% { opacity: 0; }
    }

    .topo-icon {
      position: absolute;
      transform: translate(-50%, -50%);
      display: flex;
      align-items: center;
      justify-content: center;
      pointer-events: none;
      line-height: 1;
    }

    .topo-caption {
      position: absolute;
      bottom: 6px;
      right: 0;
      font-size: 0.75rem;
      color: var(--ink-soft);
      letter-spacing: 0.12em;
      writing-mode: vertical-rl;
      opacity: 0.7;
    }

    /* Marquee strip */
    .marquee {
      margin-top: 72px;
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
      background: var(--bg-card);
      overflow: hidden;
      padding: 18px 0;
      position: relative;
      z-index: 1;
    }

    .marquee-track {
      display: flex;
      gap: 56px;
      width: max-content;
      animation: scrollx 30s linear infinite;
    }

    @keyframes scrollx {
      to { transform: translateX(-50%); }
    }

    .marquee-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-family: var(--font-display);
      font-size: 0.95rem;
      font-weight: 600;
      letter-spacing: 0.06em;
      color: var(--ink-soft);
      white-space: nowrap;
    }

    .marquee-item i {
      color: var(--accent);
      font-size: 0.55rem;
    }

    /* Features — editorial ghost-number rows */
    .features {
      padding: 120px 0 60px;
      position: relative;
    }

    .sec-head {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 72px;
      flex-wrap: wrap;
    }

    .sec-head .kicker {
      font-size: 0.82rem;
      font-weight: 600;
      letter-spacing: 0.22em;
      color: var(--accent-dark);
      display: block;
      margin-bottom: 14px;
    }

    .sec-head h2 {
      font-family: var(--font-display);
      font-size: clamp(2rem, 4.5vw, 3.2rem);
      font-weight: 700;
      letter-spacing: -0.03em;
      line-height: 1.1;
    }

    .sec-head .side-note {
      max-width: 340px;
      font-size: 0.95rem;
      color: var(--ink-soft);
      line-height: 1.8;
    }

    .feat-item {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      padding: 64px 0;
      border-top: 1px solid var(--line);
    }

    .feat-item:last-child {
      border-bottom: 1px solid var(--line);
    }

    .feat-item .ghost-num {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      font-family: var(--font-display);
      font-size: clamp(8rem, 18vw, 15rem);
      font-weight: 800;
      line-height: 1;
      color: transparent;
      -webkit-text-stroke: 1.5px var(--line);
      pointer-events: none;
      user-select: none;
      z-index: 0;
    }

    .feat-item:nth-child(odd) .ghost-num {
      right: -10px;
    }

    .feat-item:nth-child(even) .ghost-num {
      left: -10px;
    }

    .feat-item:nth-child(even) .feat-text {
      order: 2;
    }

    .feat-item:nth-child(even) .feat-visual {
      order: 1;
    }

    .feat-text {
      position: relative;
      z-index: 1;
    }

    .feat-text .chip {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--accent-dark);
      background: var(--accent-light);
      padding: 5px 14px;
      border-radius: 999px;
      margin-bottom: 18px;
    }

    .feat-text h3 {
      font-family: var(--font-display);
      font-size: clamp(1.5rem, 2.8vw, 2.1rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 16px;
    }

    .feat-text p {
      font-size: 0.98rem;
      color: var(--ink-soft);
      line-height: 1.85;
      max-width: 460px;
    }

    .feat-text .tag-line {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 20px;
    }

    .feat-text .tag-line span {
      font-size: 0.75rem;
      font-weight: 500;
      padding: 4px 12px;
      border: 1px solid var(--line);
      border-radius: 999px;
      color: var(--ink-soft);
      background: var(--bg-card);
    }

    /* Feature mini visuals — hand-drawn CSS/SVG cards */
    .feat-visual {
      position: relative;
      z-index: 1;
      display: flex;
      justify-content: center;
    }

    .mini-card {
      background: var(--bg-card);
      border: 1px solid var(--line);
      border-radius: 20px;
      box-shadow: var(--shadow-lg);
      padding: 26px;
      width: min(420px, 100%);
      transform: rotate(-1.2deg);
      transition: transform 0.4s;
    }

    .feat-item:nth-child(even) .mini-card {
      transform: rotate(1.2deg);
    }

    .feat-item:hover .mini-card {
      transform: rotate(0deg) translateY(-6px);
    }

    .mini-card .mc-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 18px;
    }

    .mini-card .mc-head .t {
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--ink-soft);
      letter-spacing: 0.08em;
    }

    .mini-card .mc-head i {
      color: var(--accent);
    }

    .device-row {
      display: flex;
      justify-content: space-between;
      gap: 10px;
    }

    .device-cell {
      flex: 1;
      text-align: center;
      padding: 16px 6px;
      border: 1px solid var(--line);
      border-radius: 12px;
      transition: all 0.25s;
    }

    .device-cell i {
      font-size: 1.3rem;
      color: var(--ink);
      display: block;
      margin-bottom: 8px;
    }

    .device-cell span {
      font-size: 0.68rem;
      color: var(--ink-soft);
      font-weight: 500;
    }

    .device-cell.on {
      border-color: var(--accent);
      background: var(--bg-soft);
    }

    .device-cell.on i {
      color: var(--accent-dark);
    }

    .sync-line {
      margin-top: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.75rem;
      color: var(--accent-dark);
      font-weight: 600;
    }

    .sync-line .bar {
      flex: 1;
      height: 4px;
      border-radius: 4px;
      background: var(--accent-light);
      overflow: hidden;
      position: relative;
    }

    .sync-line .bar::after {
      content: '';
      position: absolute;
      inset: 0;
      width: 40%;
      border-radius: 4px;
      background: var(--accent);
      animation: syncmove 2.2s ease-in-out infinite alternate;
    }

    @keyframes syncmove {
      to { transform: translateX(150%); }
    }

    .rule-flow {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .rule-line {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 14px;
      border-radius: 12px;
      border: 1px solid var(--line);
      font-size: 0.8rem;
    }

    .rule-line .r-match {
      font-family: 'Outfit', monospace;
      font-weight: 600;
      color: var(--ink);
    }

    .rule-line .r-arrow {
      color: var(--ink-soft);
      font-size: 0.7rem;
    }

    .rule-line .r-dest {
      margin-left: auto;
      font-size: 0.72rem;
      font-weight: 600;
      padding: 3px 12px;
      border-radius: 999px;
    }

    .r-dest.direct { background: var(--warm-light); color: #c47a4a; }
    .r-dest.proxy { background: var(--accent-light); color: var(--accent-dark); }

    .proto-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .proto-pill {
      font-family: var(--font-display);
      font-size: 0.85rem;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: 999px;
      border: 1.5px solid var(--line);
      color: var(--ink);
      background: var(--bg);
    }

    .proto-pill.hot {
      border-color: var(--accent);
      background: var(--accent-light);
      color: var(--accent-dark);
    }

    .perf-meter {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .meter-row .m-label {
      display: flex;
      justify-content: space-between;
      font-size: 0.78rem;
      color: var(--ink-soft);
      margin-bottom: 6px;
    }

    .meter-row .m-label b {
      color: var(--ink);
      font-family: var(--font-display);
    }

    .meter-row .m-track {
      height: 8px;
      background: var(--bg);
      border-radius: 8px;
      overflow: hidden;
    }

    .meter-row .m-fill {
      height: 100%;
      border-radius: 8px;
      background: linear-gradient(90deg, var(--accent), #3db89e);
    }

    .code-peek {
      background: #1d2836;
      border-radius: 14px;
      padding: 18px 20px;
      font-family: 'Outfit', monospace;
      font-size: 0.8rem;
      line-height: 1.9;
      color: #b8c6d4;
      overflow-x: auto;
    }

    .code-peek .c-key { color: #7fd8c4; }
    .code-peek .c-val { color: #f0c894; }
    .code-peek .c-cmt { color: #5a6b7d; }

    /* Scenario gallery — polaroid photo strip */
    .gallery {
      padding: 20px 0 140px;
    }

    .gallery .sec-head {
      margin-bottom: 84px;
    }

    .gallery-strip {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
      align-items: start;
    }

    .polaroid {
      background: #fff;
      border: 1px solid var(--line);
      padding: 14px 14px 18px;
      border-radius: 6px;
      box-shadow: var(--shadow-lg);
      transform: rotate(-2.5deg);
      transition: transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
      position: relative;
      margin: 0;
    }

    .polaroid:nth-child(2) {
      transform: rotate(1.8deg) translateY(34px);
    }

    .polaroid:nth-child(3) {
      transform: rotate(-1.4deg) translateY(10px);
    }

    .polaroid:hover {
      transform: rotate(0deg) translateY(-10px);
      z-index: 2;
    }

    .polaroid .tape {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%) rotate(-3deg);
      width: 96px;
      height: 28px;
      background: rgba(232, 168, 124, 0.32);
      backdrop-filter: blur(2px);
      box-shadow: 0 1px 3px rgba(22, 32, 46, 0.08);
      z-index: 3;
    }

    .polaroid:nth-child(2) .tape {
      background: rgba(45, 156, 138, 0.25);
      transform: translateX(-50%) rotate(2.5deg);
    }

    .polaroid .ph {
      position: relative;
      overflow: hidden;
      border-radius: 3px;
      background: var(--bg-soft);
    }

    .polaroid img {
      width: 100%;
      height: 250px;
      object-fit: cover;
      display: block;
      filter: saturate(0.92);
      transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .polaroid:hover img {
      transform: scale(1.045);
    }

    .polaroid .ph::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(155deg, rgba(45, 156, 138, 0.16) 0%, rgba(232, 168, 124, 0.1) 100%);
      mix-blend-mode: multiply;
      pointer-events: none;
    }

    .polaroid figcaption {
      margin-top: 15px;
      padding: 0 4px;
    }

    .polaroid figcaption .cap-t {
      display: block;
      font-weight: 600;
      font-size: 0.98rem;
      margin-bottom: 3px;
    }

    .polaroid figcaption .cap-s {
      font-family: var(--font-display);
      font-size: 0.72rem;
      font-weight: 600;
      letter-spacing: 0.14em;
      color: var(--accent-dark);
    }

    .gallery-note {
      margin-top: 72px;
      text-align: center;
      font-size: 0.92rem;
      color: var(--ink-soft);
    }

    .gallery-note i {
      color: var(--accent);
      margin-right: 8px;
    }

    /* Download — interactive tab selector */
    .download {
      padding: 120px 0;
      background:
        radial-gradient(ellipse 60% 50% at 50% 0%, var(--accent-light) 0%, transparent 65%),
        var(--bg-card);
      border-top: 1px solid var(--line);
    }

    .download .sec-head {
      justify-content: center;
      text-align: center;
      margin-bottom: 48px;
    }

    .os-tabs {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 10px;
      margin-bottom: 40px;
    }

    .os-tab {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 12px 24px;
      border-radius: 999px;
      border: 1.5px solid var(--line);
      background: var(--bg-card);
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--ink-soft);
      cursor: pointer;
      transition: all 0.22s;
      font-family: var(--font-body);
    }

    .os-tab i {
      font-size: 1.05rem;
    }

    .os-tab:hover {
      border-color: var(--accent);
      color: var(--accent-dark);
    }

    .os-tab.active {
      background: var(--ink);
      border-color: var(--ink);
      color: #fff;
    }

    .os-panel {
      max-width: 720px;
      margin: 0 auto;
      background: var(--bg-card);
      border: 1px solid var(--line);
      border-radius: 24px;
      box-shadow: var(--shadow-lg);
      padding: 44px 48px;
      display: none;
      grid-template-columns: auto 1fr auto;
      gap: 32px;
      align-items: center;
    }

    .os-panel.active {
      display: grid;
      animation: panelin 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    }

    @keyframes panelin {
      from { opacity: 0; transform: translateY(16px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .os-panel .big-icon {
      width: 84px;
      height: 84px;
      border-radius: 22px;
      background: var(--bg);
      border: 1px solid var(--line);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2.4rem;
      color: var(--ink);
    }

    .os-panel h3 {
      font-family: var(--font-display);
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .os-panel .os-meta {
      font-size: 0.88rem;
      color: var(--ink-soft);
      line-height: 1.7;
    }

    .os-panel .os-meta i {
      color: var(--accent);
      margin-right: 6px;
    }

    /* Trust — giant counters + github band */
    .trust {
      padding: 120px 0;
    }

    .counter-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      border-top: 1px solid var(--line);
    }

    .counter-cell {
      padding: 44px 28px 40px;
      border-bottom: 1px solid var(--line);
      border-right: 1px solid var(--line);
      position: relative;
    }

    .counter-cell:first-child {
      border-left: 1px solid var(--line);
    }

    .counter-cell .idx {
      font-size: 0.72rem;
      letter-spacing: 0.18em;
      color: var(--ink-soft);
      display: block;
      margin-bottom: 20px;
    }

    .counter-cell .value {
      font-family: var(--font-display);
      font-size: clamp(2.2rem, 4.5vw, 3.4rem);
      font-weight: 800;
      letter-spacing: -0.03em;
      line-height: 1.1;
      color: var(--ink);
    }

    .counter-cell .value .unit {
      font-size: 0.55em;
      font-weight: 700;
      color: var(--accent-dark);
      margin-left: 2px;
    }

    .counter-cell .desc {
      margin-top: 10px;
      font-size: 0.88rem;
      color: var(--ink-soft);
    }

    .counter-cell:hover {
      background: var(--bg-soft);
    }

    /* GitHub terminal band */
    .gh-band {
      margin-top: 88px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }

    .gh-band h3 {
      font-family: var(--font-display);
      font-size: clamp(1.7rem, 3.5vw, 2.5rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 18px;
    }

    .gh-band p {
      font-size: 0.98rem;
      color: var(--ink-soft);
      line-height: 1.85;
      margin-bottom: 28px;
      max-width: 440px;
    }

    .terminal {
      background: #1d2836;
      border-radius: 18px;
      box-shadow: var(--shadow-lg);
      overflow: hidden;
      transform: rotate(1deg);
      transition: transform 0.4s;
    }

    .terminal:hover {
      transform: rotate(0deg);
    }

    .terminal-bar {
      display: flex;
      align-items: center;
      gap: 7px;
      padding: 13px 16px;
      background: #16202c;
    }

    .terminal-bar span {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }

    .terminal-bar span:nth-child(1) { background: #f2726f; }
    .terminal-bar span:nth-child(2) { background: #f0b95a; }
    .terminal-bar span:nth-child(3) { background: #67c273; }

    .terminal-bar .t-title {
      width: auto;
      height: auto;
      border-radius: 0;
      background: none;
      margin-left: 10px;
      font-size: 0.72rem;
      color: #5a6b7d;
      font-family: 'Outfit', monospace;
    }

    .terminal-body {
      padding: 22px 24px 26px;
      font-family: 'Outfit', monospace;
      font-size: 0.85rem;
      line-height: 2.1;
      color: #b8c6d4;
    }

    .terminal-body .prompt { color: #7fd8c4; }
    .terminal-body .cmd { color: #e8eef4; }
    .terminal-body .out { color: #5a6b7d; }
    .terminal-body .star { color: #f0c894; }

    .terminal-body .cursor-blink {
      display: inline-block;
      width: 8px;
      height: 15px;
      background: #7fd8c4;
      vertical-align: middle;
      animation: blink 1.1s steps(1) infinite;
    }

    @keyframes blink {
      50% { opacity: 0; }
    }

    /* Footer with giant ghost wordmark */
    .footer {
      background: var(--bg-card);
      border-top: 1px solid var(--line);
      padding: 72px 0 0;
      overflow: hidden;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 56px;
    }

    .footer .logo {
      margin-bottom: 14px;
    }

    .footer-desc {
      font-size: 0.88rem;
      line-height: 1.7;
      max-width: 280px;
      color: var(--ink-soft);
    }

    .footer h4 {
      font-size: 0.82rem;
      font-weight: 600;
      letter-spacing: 0.14em;
      color: var(--ink-soft);
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 11px;
    }

    .footer-links a {
      font-size: 0.9rem;
      color: var(--ink);
      transition: color 0.2s;
    }

    .footer-links a:hover {
      color: var(--accent-dark);
    }

    .footer-lang {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .footer-lang a {
      padding: 5px 12px;
      border-radius: 999px;
      font-size: 0.78rem;
      border: 1px solid var(--line);
      color: var(--ink-soft);
      cursor: pointer;
    }

    .footer-lang a.active {
      background: var(--ink);
      border-color: var(--ink);
      color: #fff;
    }

    .footer-bottom {
      border-top: 1px solid var(--line);
      padding: 22px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.8rem;
      color: var(--ink-soft);
    }

    .footer-wordmark {
      font-family: var(--font-display);
      font-size: clamp(5rem, 16vw, 13rem);
      font-weight: 800;
      letter-spacing: -0.04em;
      line-height: 0.9;
      text-align: center;
      color: transparent;
      -webkit-text-stroke: 1.5px var(--line);
      user-select: none;
      margin-bottom: -0.18em;
      pointer-events: none;
    }

    /* Responsive */
    @media (max-width: 1020px) {
      .nav-links {
        display: none;
      }

      .menu-toggle {
        display: flex;
      }

      .mobile-menu.open {
        display: flex;
        position: fixed;
        top: 86px;
        left: 4vw;
        right: 4vw;
        z-index: 99;
        flex-direction: column;
        gap: 4px;
        background: rgba(255, 255, 255, 0.96);
        backdrop-filter: blur(16px);
        border: 1px solid var(--line);
        border-radius: 20px;
        padding: 14px;
        box-shadow: var(--shadow-lg);
        list-style: none;
      }

      .mobile-menu a {
        display: block;
        padding: 12px 18px;
        border-radius: 12px;
        font-weight: 500;
        color: var(--ink);
      }

      .mobile-menu a:hover {
        background: var(--accent-light);
        color: var(--accent-dark);
      }
    }

    @media (max-width: 900px) {
      .hero-lower {
        grid-template-columns: 1fr;
        gap: 40px;
      }

      .topo-wrap {
        order: -1;
      }

      .feat-item {
        grid-template-columns: 1fr;
        gap: 32px;
        padding: 48px 0;
      }

      .feat-item:nth-child(even) .feat-text {
        order: 1;
      }

      .feat-item:nth-child(even) .feat-visual {
        order: 2;
      }

      .feat-item .ghost-num {
        font-size: 7rem;
        top: 24px;
        transform: none;
      }

      .counter-grid {
        grid-template-columns: 1fr 1fr;
      }

      .counter-cell:nth-child(odd) {
        border-left: 1px solid var(--line);
      }

      .gh-band {
        grid-template-columns: 1fr;
        gap: 36px;
      }

      .gallery-strip {
        grid-template-columns: 1fr;
        gap: 44px;
        max-width: 440px;
        margin: 0 auto;
      }

      .polaroid:nth-child(2),
      .polaroid:nth-child(3) {
        transform: rotate(1.8deg);
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }

      .os-panel {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 36px 28px;
        gap: 20px;
      }

      .os-panel .big-icon {
        margin: 0 auto;
      }
    }

    @media (max-width: 560px) {
      .lang-chip-text,
      .lang-caret {
        display: none;
      }

      .lang-chip {
        width: 36px;
        height: 36px;
        padding: 0;
        justify-content: center;
        border-radius: 50%;
        background: var(--ink);
        border-color: var(--ink);
      }

      .lang-chip i {
        color: #fff;
      }

      .lang-dropdown {
        right: -8px;
      }

      .counter-grid {
        grid-template-columns: 1fr;
      }

      .counter-cell {
        border-left: 1px solid var(--line);
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }

      .os-tab {
        padding: 10px 16px;
        font-size: 0.85rem;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      .marquee-track,
      .topo .link,
      .topo .node-ring,
      .sync-line .bar::after,
      .btn-major,
      .reveal {
        animation: none;
        transition: none;
      }

      .reveal {
        opacity: 1;
        transform: none;
      }
    }