:root {
      --bg: #0b1220;
      --fg: #e5edf5;
      --muted: #96a3b3;
      --card: rgba(15, 23, 42, 0.62);
      --border: rgba(148, 163, 184, 0.25);
      --surface-hover: rgba(148, 163, 184, 0.18);
      --surface-press: rgba(148, 163, 184, 0.28);
      --emerald: #047857;
      --emerald-hover: #059669;
      --teal: #0f766e;
      --teal-hover: #0d9488;
      --reset-bg: rgba(148, 163, 184, 0.16);
      --reset-hover: rgba(148, 163, 184, 0.24);
      --reset-border: rgba(148, 163, 184, 0.32);
    }
    body { background: var(--bg); color: var(--fg); font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial; }
    body.light {
      --bg: #f7fafc;
      --fg: #0f172a;
      --muted: #4b5563;
      --card: rgba(255, 255, 255, 0.75);
      --border: rgba(15, 23, 42, 0.08);
      --surface-hover: rgba(15, 23, 42, 0.06);
      --surface-press: rgba(15, 23, 42, 0.12);
      --emerald: #059669;
      --emerald-hover: #10b981;
      --teal: #0d9488;
      --teal-hover: #14b8a6;
      --reset-bg: rgba(148, 163, 184, 0.18);
      --reset-hover: rgba(148, 163, 184, 0.26);
      --reset-border: rgba(148, 163, 184, 0.4);
    }
    .skip-link {
      position: absolute;
      top: -100px;
      left: 12px;
      background: #0ea5e9;
      color: #0f172a;
      padding: 8px 16px;
      border-radius: 8px;
      font-weight: 600;
      transition: top 0.2s ease;
      z-index: 200;
    }
    .skip-link:focus {
      top: 12px;
      outline: 3px solid rgba(148, 163, 184, 0.55);
    }
    .card { 
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 16px;
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      box-shadow: 0 18px 40px -32px rgba(8, 15, 35, 0.9);
    }
    body.light .card {
      box-shadow: 0 16px 36px -28px rgba(15, 23, 42, 0.25);
    }
    .pill { border: 1px solid var(--border); border-radius: 9999px; padding: 4px 10px; font-size: 12px; color: var(--muted); }
    .pill--theme {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      min-height: 28px;
      padding: 6px 14px;
      font-weight: 600;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--fg);
      background: transparent;
      transition: background 0.2s ease, color 0.2s ease;
    }
    .pill--theme:hover,
    .pill--theme:focus-visible {
      background: var(--surface-hover);
      color: var(--fg);
    }
    body.light .pill--theme {
      color: var(--fg);
    }
    .test-card__brand-sub {
      font-size: 0.68rem;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      margin-top: 2px;
    }
    .test-guide {
      max-width: 720px;
      margin: 0 auto;
      line-height: 1.5;
    }
    .test-guide__label {
      font-weight: 700;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      margin-right: 6px;
    }
    .test-guide__link {
      color: var(--fg);
      font-weight: 600;
      text-decoration: underline;
      text-decoration-thickness: 1px;
      text-underline-offset: 2px;
    }
    .test-guide__link:hover,
    .test-guide__link:focus-visible {
      text-decoration-thickness: 2px;
    }
    body.light .test-guide__link {
      color: var(--teal);
    }
    .label-verbose { display: inline; }
    .label-compact { display: none; }
    .pill-strong {
      background: var(--emerald);
      color: #ecfdf5;
      border-color: var(--emerald);
      font-weight: 600;
      letter-spacing: 0.02em;
    }
    .pill-strong:hover { background: var(--emerald-hover); border-color: var(--emerald-hover); }
    .pill-strong:active { background: var(--emerald-hover); border-color: var(--emerald-hover); }
    .muted { color: var(--muted); }
    .site-header {
      background: radial-gradient(circle at 15% 20%, rgba(56, 189, 248, 0.28), transparent 55%),
        radial-gradient(circle at 85% 0%, rgba(34, 197, 94, 0.24), transparent 60%),
        rgba(15, 23, 42, 0.6);
      border-bottom: 1px solid var(--border);
      position: relative;
    }
    body.light .site-header {
      background: radial-gradient(circle at 15% 20%, rgba(14, 165, 233, 0.18), transparent 55%),
        radial-gradient(circle at 85% 0%, rgba(34, 197, 94, 0.16), transparent 60%),
        rgba(248, 250, 252, 0.92);
    }
    .site-header__inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      padding: 18px 16px 12px;
      max-width: 1200px;
      margin: 0 auto;
    }
    .site-brand {
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: 0.05em;
      color: var(--fg);
      text-decoration: none;
    }
    .site-nav {
      display: flex;
      flex-wrap: wrap;
      gap: 12px 18px;
      font-size: 0.875rem;
    }
    .site-nav__link {
      color: var(--muted);
      font-weight: 600;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      font-size: 0.75rem;
      transition: color 0.2s ease;
    }
    .site-nav__link:hover,
    .site-nav__link:focus-visible {
      color: var(--fg);
    }
    .site-header__menu-toggle {
      display: none;
      align-items: center;
      gap: 10px;
      background: var(--card);
      color: var(--fg);
      border: 1px solid var(--border);
      border-radius: 999px;
      padding: 8px 18px;
      font-size: 0.72rem;
      font-weight: 700;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }
    body.light .site-header__menu-toggle {
      background: rgba(248, 250, 252, 0.92);
    }
    .site-header__menu-toggle:hover,
    .site-header__menu-toggle:focus-visible {
      background: var(--surface-hover);
      color: var(--fg);
    }
    .site-header__menu-toggle.is-active {
      background: var(--surface-hover);
      color: var(--fg);
    }
    .site-header__menu-icon {
      position: relative;
      display: inline-flex;
      width: 18px;
      height: 2px;
      border-radius: 999px;
      background: currentColor;
      transition: background 0.24s ease;
    }
    .site-header__menu-icon::before,
    .site-header__menu-icon::after {
      content: "";
      position: absolute;
      left: 0;
      width: 100%;
      height: 2px;
      border-radius: 999px;
      background: currentColor;
      transition: transform 0.24s ease, opacity 0.24s ease;
    }
    .site-header__menu-icon::before {
      top: -6px;
    }
    .site-header__menu-icon::after {
      top: 6px;
    }
    .site-header__menu-toggle.is-active .site-header__menu-icon {
      background: transparent;
    }
    .site-header__menu-toggle.is-active .site-header__menu-icon::before {
      transform: translateY(6px) rotate(45deg);
    }
    .site-header__menu-toggle.is-active .site-header__menu-icon::after {
      transform: translateY(-6px) rotate(-45deg);
    }
    .site-hero {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 16px 32px;
      display: grid;
      gap: 20px;
    }
    .site-hero__heading {
      font-size: clamp(2rem, 5vw, 3rem);
      font-weight: 700;
      line-height: 1.1;
    }
    .site-hero__body {
      display: grid;
      gap: 16px;
      max-width: 780px;
      color: var(--muted);
    }
    .site-hero__cta {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      padding: 12px 26px;
      border-radius: 999px;
      background: linear-gradient(135deg, rgba(34, 197, 94, 0.9), rgba(56, 189, 248, 0.9));
      color: #ecfdf5;
      width: fit-content;
      box-shadow: 0 18px 44px -24px rgba(56, 189, 248, 0.65);
    }
    .site-hero__cta:hover {
      box-shadow: 0 20px 50px -24px rgba(56, 189, 248, 0.8);
    }
    .site-main {
      display: grid;
      gap: 40px;
      padding: 40px 0 64px;
    }
    .content-shell {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 16px;
      display: grid;
      gap: clamp(22px, 4vw, 32px);
    }
    .content-section {
      border-radius: 20px;
      padding: clamp(20px, 5vw, 32px);
      background: var(--card);
      border: 1px solid var(--border);
      display: grid;
      gap: clamp(16px, 4vw, 24px);
    }
    .section-heading {
      font-size: clamp(1.5rem, 3.2vw, 2.1rem);
      font-weight: 700;
      color: var(--fg);
      letter-spacing: -0.01em;
    }
    .section-intro {
      font-size: 1rem;
      color: var(--muted);
      line-height: 1.7;
    }
    .content-list {
      display: grid;
      gap: 12px;
      margin: 0;
      padding-left: 20px;
    }
    .content-list > li {
      line-height: 1.6;
    }
    .info-grid {
      display: grid;
      gap: 18px;
    }
    @media (min-width: 768px) {
      .info-grid.two {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
      .info-grid.three {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }
    }
    .info-card {
      padding: clamp(18px, 4vw, 24px);
      border-radius: 16px;
      border: 1px solid var(--border);
      background: rgba(15, 23, 42, 0.45);
      display: grid;
      gap: 10px;
    }
    body.light .info-card {
      background: rgba(248, 250, 252, 0.82);
    }
    .info-card__title {
      font-weight: 600;
      letter-spacing: 0.02em;
    }
    .faq-list {
      display: grid;
      gap: 18px;
    }
    .faq-item {
      border-radius: 14px;
      padding: clamp(18px, 4.5vw, 24px);
      border: 1px solid var(--border);
      background: rgba(15, 23, 42, 0.38);
      display: grid;
      gap: 8px;
    }
    body.light .faq-item {
      background: rgba(248, 250, 252, 0.82);
    }
    .faq-item__question {
      font-weight: 600;
      letter-spacing: 0.01em;
    }
    .site-footer {
      border-top: 1px solid var(--border);
      background: rgba(15, 23, 42, 0.72);
      margin-top: 48px;
    }
    body.light .site-footer {
      background: rgba(248, 250, 252, 0.9);
    }
    .site-footer__inner {
      max-width: 1200px;
      margin: 0 auto;
      padding: 32px 16px 48px;
      display: grid;
      gap: 24px;
    }
    .site-footer__meta {
      font-size: 0.875rem;
      color: var(--muted);
    }
    .sr-only {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      clip-path: inset(50%);
      white-space: nowrap;
      border: 0;
    }
    canvas { background: transparent; display: block; }
    .chart-wrap { overflow: hidden; }
    .chart-card {
      position: relative;
    }
    .chart-card .chart-toggle {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.35rem;
      font-weight: 600;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 8px;
      border: 1px solid var(--reset-border);
      background: var(--reset-bg);
      color: var(--fg);
      transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
    }
    .chart-card .chart-toggle:hover {
      background: var(--reset-hover);
    }
    .chart-card .chart-toggle:active {
      background: var(--surface-press);
    }
    .chart-card .chart-content {
      margin-top: 12px;
    }
    .chart-card[data-collapsed="true"] .chart-content {
      display: none;
    }
    .chart-card[data-collapsed="false"] .chart-content {
      display: block;
    }
    .chart-placeholder {
      display: none;
    }
    @media (max-width: 1023px) {
      .chart-placeholder {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.35rem;
        font-weight: 600;
        font-size: 12px;
        padding: 6px 12px;
        border-radius: 10px;
        border: 1px solid var(--reset-border);
        background: var(--reset-bg);
        color: var(--fg);
        transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
        width: 100%;
      }
      .chart-placeholder:hover {
        background: var(--reset-hover);
      }
      .chart-placeholder:active {
        background: var(--surface-press);
      }
    }
    @media (min-width: 1024px) {
      .chart-placeholder {
        display: none !important;
      }
      .chart-card .chart-toggle {
        font-size: 11px;
        padding: 3px 8px;
        border-radius: 6px;
      }
    }
    .control-btn {
      padding: 4px 20px;
      min-height: 32px;
      min-width: 96px;
      border-radius: 8px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.35rem;
      font-weight: 600;
      letter-spacing: 0.01em;
      color: var(--fg);
      border: 1px solid var(--reset-border);
      background: var(--reset-bg);
      transition: background 0.18s ease, color 0.18s ease, opacity 0.18s ease, border-color 0.18s ease;
    }
    .control-btn:hover {
      background: var(--reset-hover);
    }
    .control-btn:active {
      background: var(--surface-press);
    }
    .control-btn:focus-visible {
      outline: 2px solid rgba(148, 163, 184, 0.4);
      outline-offset: 2px;
    }
    .control-btn:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      filter: saturate(0.85);
    }
    #runAll.control-btn {
      background: var(--emerald);
      border-color: var(--emerald);
      color: #ecfdf5;
    }
    #runAll.control-btn:hover {
      background: var(--emerald-hover);
      border-color: var(--emerald-hover);
    }
    #runAll.control-btn:active {
      background: var(--emerald-hover);
      border-color: var(--emerald-hover);
    }
    #runAll.control-btn.run-btn-busy {
      background: var(--emerald-hover);
      border-color: var(--emerald-hover);
    }
    #runAll.control-btn.run-btn-busy:disabled {
      opacity: 0.85;
    }
    .status-spinner {
      width: 16px;
      height: 16px;
      border-radius: 9999px;
      border: 2px solid rgba(52, 211, 153, 0.25);
      border-top-color: #34d399;
      animation: spin 0.65s linear infinite;
      display: inline-block;
    }
    .status-label {
      font-size: 9px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      font-weight: 600;
      color: var(--muted);
    }
    .status-label.status-running {
      color: rgba(148, 163, 184, 0.9);
    }
    .status-label.status-done {
      color: #34d399;
    }
    @keyframes spin {
      to { transform: rotate(360deg); }
    }
    .mobile-loading {
      position: fixed;
      inset: 0;
      display: none;
      align-items: center;
      justify-content: center;
      background: radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.14), rgba(11, 18, 32, 0.92));
      z-index: 70;
      transition: opacity 0.45s ease;
      opacity: 1;
    }
    .mobile-loading.is-active {
      display: flex;
    }
    .mobile-loading.is-leaving {
      opacity: 0;
      pointer-events: none;
    }
    .mobile-loading__inner {
      display: grid;
      gap: 16px;
      place-items: center;
      text-align: center;
    }
    .mobile-loading__spinner {
      width: 72px;
      height: 72px;
      border-radius: 9999px;
      position: relative;
      background: conic-gradient(from 90deg, rgba(56, 189, 248, 0.15), rgba(56, 189, 248, 0.75), rgba(34, 197, 94, 0.9), rgba(56, 189, 248, 0.15));
      animation: mobileLoaderSpin 1.6s linear infinite;
      box-shadow: 0 18px 30px -20px rgba(15, 23, 42, 0.85);
    }
    .mobile-loading__spinner::after {
      content: "";
      position: absolute;
      inset: 12px;
      border-radius: 9999px;
      background: rgba(11, 18, 32, 0.92);
      box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.25);
    }
    .mobile-loading__text {
      font-size: 13px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      font-weight: 600;
      color: rgba(229, 237, 245, 0.9);
    }
    @keyframes mobileLoaderSpin {
      to { transform: rotate(360deg); }
    }
    .floating-start-wrap {
      position: fixed;
      left: 50%;
      bottom: 22px;
      transform: translateX(-50%);
      z-index: 140;
      display: none;
      align-items: center;
      justify-content: center;
      transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1), top 0.4s cubic-bezier(0.22, 1, 0.36, 1), bottom 0.4s cubic-bezier(0.22, 1, 0.36, 1), left 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    }
    .floating-start-wrap.is-overlay {
      bottom: auto;
      top: var(--overlay-top, 50%);
      left: var(--overlay-left, 50%);
      transform: translate(-50%, -50%);
    }
    .floating-start-wrap.is-docked {
      top: auto;
      left: 50%;
      bottom: 22px;
      transform: translateX(-50%);
    }
    body.floating-overlay-active .floating-start-wrap {
      display: flex;
    }
    .floating-start {
      min-width: 176px;
      padding: 12px 24px;
      border-radius: 9999px;
      font-weight: 700;
      font-size: 15px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      background: linear-gradient(135deg, rgba(34, 197, 94, 0.92), rgba(56, 189, 248, 0.92));
      color: #ecfdf5;
      border: none;
      box-shadow: 0 18px 42px -22px rgba(56, 189, 248, 0.75);
      transition: box-shadow 0.28s ease, transform 0.28s ease, opacity 0.28s ease;
      cursor: pointer;
    }
    .floating-start:hover {
      box-shadow: 0 20px 44px -20px rgba(56, 189, 248, 0.9);
    }
    .floating-start:disabled {
      opacity: 0.72;
      cursor: not-allowed;
      box-shadow: 0 12px 30px -24px rgba(15, 23, 42, 0.8);
    }
    .floating-start:focus-visible {
      outline: 3px solid rgba(148, 163, 184, 0.55);
      outline-offset: 3px;
    }
    .floating-start.is-animating {
      animation: floatingStartReturn 0.8s cubic-bezier(0.33, 1, 0.68, 1);
    }
    .floating-start-busy {
      box-shadow: 0 16px 42px -22px rgba(34, 197, 94, 0.8);
    }
    @keyframes floatingStartReturn {
      0% { transform: translateY(0) scale(1); }
      40% { transform: translateY(-14px) scale(1.04); }
      70% { transform: translateY(6px) scale(0.97); }
      100% { transform: translateY(0) scale(1); }
    }
    .stat-controls__head {
      display: none;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 8px;
    }
    .stat-controls__title {
      font-size: 12px;
      letter-spacing: 0.22em;
      text-transform: uppercase;
      font-weight: 700;
      color: rgba(226, 232, 240, 0.9);
    }
    body.light .stat-controls__title {
      color: rgba(30, 41, 59, 0.72);
    }
    @media (max-width: 768px) {
      .floating-start-wrap { display: flex; }
      #runAll { display: none !important; }
    }
    @media (min-width: 769px) {
      .mobile-loading { display: none !important; }
      .floating-start-wrap { display: none !important; }
    }
    #controlsPanel {
      padding: 12px 14px;
      gap: 12px;
    }
    #controlsPanel .grid > .grid {
      gap: 6px;
    }
    #controlsPanel label {
      font-size: 11px;
      letter-spacing: 0.08em;
    }
    #controlsPanel select {
      font-size: 13px;
      padding: 6px 10px;
      border-radius: 10px;
    }
    @media (max-width: 1023px) {
      .stat-controls__head {
        display: flex;
      }
      .controls-sheet {
        padding: 12px 14px;
        gap: 12px;
      }
      .controls-sheet .grid-cols-2 {
        grid-template-columns: 1fr !important;
      }
      .controls-sheet .md\:grid-cols-3 {
        grid-template-columns: 1fr !important;
      }
      .controls-sheet .sm\:flex-row {
        flex-direction: column !important;
        align-items: stretch !important;
      }
      .controls-sheet .sm\:flex-row > * {
        width: 100% !important;
      }
      .controls-sheet .sm\:gap-3 {
        gap: 12px !important;
      }
      .controls-sheet .sm\:w-auto {
        width: 100% !important;
      }
    }
    .metric-card {
      position: relative;
      width: 100%;
      max-width: none;
      min-height: clamp(220px, 28vw, 300px);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid rgba(148, 163, 184, 0.32);
      background: linear-gradient(145deg, rgba(11, 18, 32, 0.85), rgba(11, 18, 32, 0.55));
      box-shadow: 0 18px 40px -32px rgba(8, 15, 35, 0.85);
      transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.35s ease, box-shadow 0.35s ease;
      --spark-pad: clamp(22px, 3vw, 34px);
    }
    body.light .metric-card {
      background: linear-gradient(145deg, rgba(248, 250, 252, 0.92), rgba(226, 232, 240, 0.66));
      border-color: rgba(15, 23, 42, 0.12);
      box-shadow: 0 18px 38px -30px rgba(15, 23, 42, 0.28);
    }
    .metric-card--throughput {
      min-height: clamp(240px, 30vw, 340px);
    }
    .metric-card--throughput .metric-card__inner {
      display: grid;
      grid-template-columns: minmax(0, 1fr);
      height: 100%;
      position: relative;
      z-index: 1;
      transition: filter 0.3s ease, opacity 0.3s ease;
    }
    .metric-card--throughput .metric-panel {
      position: relative;
      min-height: clamp(200px, 25vw, 300px);
      display: block;
      overflow: hidden;
    }
    .metric-card--throughput .metric-panel + .metric-panel {
      border-top: 1px solid rgba(148, 163, 184, 0.18);
    }
    body.light .metric-card--throughput .metric-panel + .metric-panel {
      border-top-color: rgba(148, 163, 184, 0.22);
    }
    .metric-card--throughput .metric-panel .metric-readout {
      padding-top: clamp(26px, 3vw, 38px);
    }
    @media (min-width: 768px) {
      .metric-card--throughput .metric-card__inner {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
      .metric-card--throughput .metric-panel {
        min-height: clamp(220px, 24vw, 300px);
      }
      .metric-card--throughput .metric-panel + .metric-panel {
        border-top: none;
        border-left: 1px solid rgba(148, 163, 184, 0.18);
      }
      body.light .metric-card--throughput .metric-panel + .metric-panel {
        border-left-color: rgba(148, 163, 184, 0.22);
      }
    }
    @media (max-width: 768px) {
      body.floating-overlay-active .metric-card--throughput::after {
        content: "";
        position: absolute;
        inset: 0;
        background: rgba(11, 18, 32, 0.55);
        backdrop-filter: blur(6px);
        z-index: 2;
      }
      body.light.floating-overlay-active .metric-card--throughput::after {
        background: rgba(248, 250, 252, 0.6);
      }
      body.floating-overlay-active .metric-card--throughput .metric-card__inner {
        filter: blur(4px);
        opacity: 0.55;
      }
      body.floating-overlay-active .metric-card--throughput {
        pointer-events: none;
      }
      body.floating-overlay-active .floating-start {
        box-shadow: 0 24px 52px -24px rgba(56, 189, 248, 0.85);
      }
    }
    .metric-card.metric--running {
      transform: translateY(-2px);
      border-color: rgba(56, 189, 248, 0.52);
      box-shadow: 0 20px 42px -28px rgba(56, 189, 248, 0.45);
    }
    .metric-card.metric--done {
      border-color: rgba(52, 211, 153, 0.42);
      box-shadow: 0 18px 38px -28px rgba(52, 211, 153, 0.4);
    }
    .metric-live-toggle {
      position: absolute;
      top: clamp(14px, 2.6vw, 26px);
      right: clamp(14px, 2.6vw, 26px);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 12px;
      font-size: 0.68rem;
      font-weight: 600;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      line-height: 1;
      background: rgba(15, 23, 42, 0.76);
      color: var(--fg);
      border: 1px solid rgba(148, 163, 184, 0.35);
      border-radius: 9999px;
      cursor: pointer;
      pointer-events: auto;
      z-index: 3;
      transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
    }
    body.light .metric-live-toggle {
      background: rgba(248, 250, 252, 0.9);
      color: var(--fg);
      border-color: rgba(148, 163, 184, 0.28);
    }
    .metric-live-toggle:hover,
    .metric-live-toggle:focus-visible {
      background: var(--surface-hover);
      border-color: rgba(148, 163, 184, 0.45);
      outline: none;
    }
    body.light .metric-live-toggle:hover,
    body.light .metric-live-toggle:focus-visible {
      background: rgba(15, 23, 42, 0.08);
      border-color: rgba(15, 23, 42, 0.18);
    }
    .metric-live-toggle:focus-visible {
      box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.28);
    }
    .metric-live-toggle__label {
      font-size: 0.6rem;
      letter-spacing: 0.08em;
    }
    .metric-live-toggle__state {
      font-size: 0.68rem;
    }
    .metric-live-toggle[aria-pressed="false"] {
      background: rgba(148, 163, 184, 0.16);
      color: var(--muted);
      border-color: rgba(148, 163, 184, 0.3);
    }
    body.light .metric-live-toggle[aria-pressed="false"] {
      background: rgba(148, 163, 184, 0.2);
      border-color: rgba(148, 163, 184, 0.32);
    }
    .metric-live-toggle[aria-pressed="false"] .metric-live-toggle__state {
      font-weight: 700;
    }
    .metric-panel[data-live-disabled="true"] .metric-readout {
      opacity: 0.72;
    }
    .metric-panel[data-live-disabled="true"] .metric-sparkline {
      pointer-events: none;
    }
    .metric-panel[data-live-disabled="true"] .metric-sparkline svg {
      opacity: 0.2;
    }
    .metric-panel[data-live-disabled="true"] .metric-sparkline .spark-dot {
      opacity: 0;
    }
    .metric-panel[data-live-disabled="true"] .metric-sparkline .spark-tooltip {
      display: none !important;
    }
    .metric-readout {
      position: relative;
      z-index: 2;
      width: 100%;
      max-width: none;
      padding: clamp(22px, 2.4vw, 32px) clamp(22px, 2.8vw, 36px) clamp(28px, 3.2vw, 40px);
      display: grid;
      gap: 12px;
      align-items: start;
      background: linear-gradient(180deg, rgba(11, 18, 32, 0.82), rgba(11, 18, 32, 0.18));
      border: none;
      pointer-events: none;
    }
    body.light .metric-readout {
      background: linear-gradient(180deg, rgba(248, 250, 252, 0.92), rgba(248, 250, 252, 0.35));
    }
    .stat-card {
      padding: 12px 14px;
      display: grid;
      gap: 10px;
      align-content: center;
      min-height: 100px;
      text-align: left;
    }
    .stat-card--right .stat-value {
      margin-left: auto;
      justify-content: flex-end;
      text-align: right;
    }
    .stat-card--bloat .stat-metric {
      flex-wrap: nowrap;
    }
    @media (min-width: 768px) {
      .stat-card {
        padding: 18px;
        min-height: 120px;
      }
    }
    .stat-grid {
      grid-template-columns: repeat(3, minmax(0, 1fr));
      align-items: stretch;
    }
    .stat-grid .stat-card {
      height: 100%;
    }
    .stat-grid .stat-controls {
      grid-column: 1 / -1;
    }
    @media (max-width: 600px) {
      .stat-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 10px;
      }
      .stat-grid .stat-card {
        min-height: 88px;
        padding: 10px 12px;
      }
      .stat-grid .stat-card .stat-label {
        white-space: nowrap;
      }
      .stat-grid .stat-controls {
        grid-column: 1 / -1;
      }
    }
    @media (min-width: 1024px) {
      .stat-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
        gap: 12px;
      }
      .stat-grid .stat-card {
        padding: 12px 14px;
        min-height: 88px;
        gap: 6px;
        border-radius: 12px;
      }
      .stat-grid .stat-card .stat-label {
        font-size: 9px;
        letter-spacing: 0.12em;
      }
      .stat-grid .stat-card .stat-value {
        font-size: 20px;
        gap: 4px;
      }
      .stat-grid .stat-card .stat-value-sm {
        font-size: 16px;
      }
      .stat-grid .stat-card .stat-unit {
        font-size: 10px;
        letter-spacing: 0.1em;
      }
      .stat-grid .stat-controls {
        grid-column: span 2;
      }
      .stat-metric {
        gap: 8px;
      }
      #controlsPanel {
        padding: 14px 16px;
        gap: 12px;
      }
      #controlsPanel .grid > .grid {
        gap: 6px;
      }
      #controlsPanel label {
        font-size: 11px;
        letter-spacing: 0.08em;
      }
      #controlsPanel select {
        font-size: 13px;
        padding: 6px 10px;
        border-radius: 10px;
      }
      .control-btn {
        font-size: 13px;
        padding: 4px 14px;
        min-height: 30px;
        min-width: 88px;
      }
    }
    .stat-label {
      font-size: 11px;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--muted);
      font-weight: 600;
    }
    .stat-value {
      font-size: clamp(22px, 2.4vw, 30px);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.1;
      font-variant-numeric: tabular-nums;
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .stat-metric {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      gap: 12px;
      flex-wrap: wrap;
    }
    .stat-value-sm {
      font-size: clamp(18px, 2vw, 24px);
      font-weight: 600;
      line-height: 1.1;
      font-variant-numeric: tabular-nums;
    }
    @media (max-width: 767px) {
      .stat-grid {
        gap: 10px;
      }
      .stat-grid .stat-card {
        padding: 10px 14px;
        min-height: 0;
        border-radius: 16px;
        gap: 8px;
        display: grid;
        align-content: center;
        background: var(--card);
        box-shadow: 0 16px 34px -26px rgba(8, 15, 35, 0.65);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border: 1px solid var(--border);
      }
      .stat-grid .stat-card .stat-label {
        font-size: 8.5px;
        letter-spacing: 0.14em;
        text-transform: uppercase;
      }
      .stat-grid .stat-card .stat-value {
        font-size: clamp(16px, 4.6vw, 20px);
        gap: 4px;
        align-items: center;
      }
      .stat-grid .stat-card .stat-value-sm {
        font-size: clamp(13px, 4vw, 16px);
      }
      .stat-grid .stat-card .stat-unit {
        font-size: 8px;
        letter-spacing: 0.1em;
      }
      .stat-metric {
        flex-wrap: nowrap;
        gap: 6px;
        align-items: center;
      }
      .stat-metric__label {
        font-size: 9px;
        letter-spacing: 0.12em;
        text-transform: uppercase;
        display: inline-flex;
        gap: 4px;
        align-items: center;
      }
      .stat-value-sm {
        font-size: clamp(14px, 4vw, 17px);
        line-height: 1;
      }
      .stat-metric__value {
        margin-left: auto;
        text-align: right;
        gap: 4px;
      }
    }
    .stat-metric__label {
      flex: 1 1 auto;
      min-width: 0;
    }
    .stat-metric__value {
      flex: 0 1 auto;
      display: flex;
      align-items: baseline;
      gap: 6px;
      justify-content: flex-end;
      text-align: right;
      max-width: 100%;
    }
    .stat-unit {
      font-size: 11px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      font-weight: 600;
      color: var(--muted);
      transition: opacity 0.2s ease;
    }
    .stat-quality-value {
      transition: color 0.2s ease;
    }
    .stat-quality-value[data-empty="true"] {
      color: var(--muted);
    }
    .stat-quality-value[data-empty="true"] + .stat-unit {
      opacity: 0;
    }
    .stat-quality-value.is-good {
      color: #34d399;
    }
    .stat-quality-value.is-fair {
      color: #facc15;
    }
    .stat-quality-value.is-poor {
      color: #fb923c;
    }
    .stat-quality-value.is-worst {
      color: #f87171;
    }
    .stat-controls {
      align-content: start;
    }
    .stat-controls select {
      border-radius: 12px;
    }
    .metric-readout .metric-value {
      font-variant-numeric: tabular-nums;
      line-height: 1;
    }
    .metric-unit {
      font-size: 11px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      font-weight: 600;
      color: var(--muted);
    }
    .metric-main {
      display: flex;
      align-items: baseline;
      gap: 10px;
      pointer-events: auto;
    }
    .metric-summary {
      display: grid;
      gap: 4px;
      font-size: 12px;
      pointer-events: auto;
    }
    .metric-summary .metric-top {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--muted);
    }
    .metric-summary .metric-top strong {
      color: var(--fg);
      font-weight: 600;
      letter-spacing: 0.01em;
    }
    .metric-summary .top-dot {
      width: 6px;
      height: 6px;
      border-radius: 9999px;
      background: var(--emerald);
      box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.45);
      opacity: 0;
      transform: scale(0.4);
    }
    .metric-summary .top-dot.is-active {
      animation: topSpeedPing 0.9s ease-out forwards;
    }
    @keyframes topSpeedPing {
      0% { opacity: 0.95; transform: scale(1); box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.55); }
      70% { opacity: 0; transform: scale(2.6); box-shadow: 0 0 0 10px rgba(52, 211, 153, 0); }
      100% { opacity: 0; transform: scale(0.4); box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
    }
    .metric-label {
      font-size: 12px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      font-weight: 600;
      color: var(--muted);
      pointer-events: auto;
    }
    .metric-sparkline {
      position: absolute;
      inset: 0;
      padding: var(--spark-pad);
      border: none;
      border-radius: 0;
      background: linear-gradient(140deg, rgba(15, 23, 42, 0.4), rgba(15, 23, 42, 0.1));
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      cursor: crosshair;
      transition: border-color 0.35s ease, box-shadow 0.35s ease, background 0.35s ease;
      touch-action: pan-y;
    }
    body.light .metric-sparkline {
      background: linear-gradient(140deg, rgba(226, 232, 240, 0.65), rgba(255, 255, 255, 0.35));
    }
    .metric-sparkline[data-kind="dl"] {
      --spark-line: #38bdf8;
      --spark-fill: rgba(56, 189, 248, 0.18);
      --spark-dot: rgba(56, 189, 248, 0.95);
    }
    .metric-sparkline[data-kind="ul"] {
      --spark-line: #34d399;
      --spark-fill: rgba(52, 211, 153, 0.18);
      --spark-dot: rgba(52, 211, 153, 0.95);
    }
    .metric-sparkline.is-running {
      background: linear-gradient(140deg, rgba(56, 189, 248, 0.35), rgba(15, 23, 42, 0.08));
      box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.35);
    }
    .metric-sparkline.is-done {
      background: linear-gradient(140deg, rgba(52, 211, 153, 0.3), rgba(15, 23, 42, 0.06));
      box-shadow: inset 0 0 0 1px rgba(52, 211, 153, 0.28);
    }
    .metric-sparkline svg {
      width: 100%;
      height: 100%;
      min-height: 0;
      display: block;
      flex: 1 1 auto;
    }
    .metric-sparkline path.spark-area {
      fill: var(--spark-fill, rgba(52, 211, 153, 0.18));
      transition: d 0.2s ease;
    }
    .metric-sparkline path.spark-line {
      stroke: var(--spark-line, rgba(52, 211, 153, 0.9));
      stroke-width: 2.2;
      fill: none;
      transition: d 0.2s ease, stroke 0.3s ease;
    }
    .metric-sparkline circle.spark-dot {
      fill: var(--spark-dot, rgba(52, 211, 153, 0.95));
      r: 2.8;
      opacity: 0;
      transition: opacity 0.18s ease, r 0.18s ease;
    }
    .metric-sparkline.spark-active circle.spark-dot {
      opacity: 1;
      r: 3.4;
    }
    .metric-sparkline.spark-empty {
      cursor: default;
    }
    .metric-sparkline.spark-empty svg {
      opacity: 0.35;
    }
    .metric-sparkline .spark-tooltip {
      position: absolute;
      pointer-events: none;
      top: 0;
      left: 0;
      transform: translate(-50%, -120%);
      background: rgba(15, 23, 42, 0.94);
      color: #f8fafc;
      font-size: 10px;
      padding: 4px 6px;
      border-radius: 6px;
      border: 1px solid rgba(148, 163, 184, 0.25);
      box-shadow: 0 10px 18px -14px rgba(8, 15, 35, 0.7);
      opacity: 0;
      transition: opacity 0.18s ease;
      white-space: nowrap;
      z-index: 3;
    }
    body.light .metric-sparkline .spark-tooltip {
      background: rgba(15, 23, 42, 0.88);
      color: #f1f5f9;
      border-color: rgba(15, 23, 42, 0.2);
    }
    .metric-sparkline.spark-active .spark-tooltip {
      opacity: 1;
    }
    .history-card {
      display: grid;
      gap: 16px;
    }
    .history-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      flex-wrap: wrap;
    }
    .history-title {
      font-size: 1.125rem;
      font-weight: 600;
    }
    .history-actions {
      display: inline-flex;
      gap: 8px;
      align-items: center;
    }
    .history-toggle {
      display: none;
    }
    .history-pagination {
      display: none;
      align-items: center;
      justify-content: space-between;
      margin-top: 0;
      gap: 12px;
      flex-wrap: wrap;
      font-size: 12px;
      color: var(--muted);
    }
    .history-pagination.is-visible {
      display: flex;
    }
    .history-pagination .pager-controls {
      display: inline-flex;
      gap: 8px;
      align-items: center;
    }
    .history-pagination button {
      padding: 6px 14px;
      border-radius: 8px;
      border: 1px solid var(--reset-border);
      background: var(--reset-bg);
      color: var(--fg);
      font-weight: 600;
      letter-spacing: 0.02em;
      transition: background 0.18s ease, border-color 0.18s ease;
    }
    .history-pagination button:hover {
      background: var(--reset-hover);
    }
    .history-pagination button:active {
      background: var(--surface-press);
    }
    .history-pagination button:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }
    .history-pagination .page-info {
      font-weight: 500;
      color: var(--fg);
    }
    @media (max-width: 1023px) {
      .history-card {
        gap: 12px;
      }
      .history-header {
        align-items: flex-start;
      }
      .history-actions {
        order: 3;
        width: 100%;
        justify-content: flex-start;
      }
      .history-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.35rem;
        font-weight: 600;
        font-size: 12px;
        padding: 4px 10px;
        border-radius: 8px;
        border: 1px solid var(--reset-border);
        background: var(--reset-bg);
        color: var(--fg);
        transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
        order: 2;
      }
      .history-toggle:hover {
        background: var(--reset-hover);
      }
      .history-toggle:active {
        background: var(--surface-press);
      }
      .history-card[data-collapsed="true"] .history-content {
        display: none;
      }
      .history-card[data-collapsed="false"] .history-content {
        display: grid;
        gap: 16px;
      }
    }
    @media (min-width: 1024px) {
      .history-card {
        gap: 20px;
      }
      .history-card .history-content {
        display: grid;
        gap: 16px;
      }
    }
    .gradient-text {
      color: var(--fg);
    }

.muted { opacity: .75; }
  @media (max-width: 420px) {
    :root { --pad: 8px; --gap: 8px; --radius: 10px; }
    body { padding: var(--pad); }
    .card { padding: var(--pad); border-radius: var(--radius); }
    .grid { gap: var(--gap); }
    .pill { padding: 2px 6px; font-size: 10px; }
    .text-3xl { font-size: 1.6rem; line-height: 1.2; }
    .text-xl { font-size: 1.05rem; }
    .text-lg { font-size: 1rem; }
    .text-sm { font-size: .82rem; }
    .text-xs { font-size: .74rem; }
    .control-btn { width: 100% !important; min-width: 0; }
    .section { margin-top: 10px; }
    .row { margin-top: 6px; }
    .chart-wrap { height: 140px !important; }
    canvas { max-height: 140px !important; }
    .two-col { display: grid; grid-template-columns: 1fr; gap: var(--gap); }
    .kv { display: grid; grid-template-columns: auto 1fr; column-gap: 8px; row-gap: 2px; align-items: center; }
    .truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .label-verbose { display: none; }
    .label-compact { display: inline; }
    .metric-card {
      max-width: none;
      min-height: 220px;
      --spark-pad: 18px;
    }
    .metric-readout {
      padding: 18px 18px 26px;
    }
    .metric-main { gap: 6px; }
    .metric-readout .metric-value { font-size: 2.8rem; }
    .metric-sparkline .spark-meta { font-size: 10px; padding: 6px 10px; }
    .metric-sparkline .spark-readout { font-size: 11px; }
    .floating-start-wrap { bottom: 16px; }
    .floating-start {
      min-width: 0;
      width: min(240px, calc(100vw - 96px));
      max-width: 260px;
      font-size: 14px;
      letter-spacing: 0.1em;
    }
    .mobile-loading__spinner { width: 64px; height: 64px; }
    .mobile-loading__spinner::after { inset: 10px; }
    .mobile-loading__text { font-size: 11px; }
  }
  body.compact .card { padding: 8px; }
  body.compact .chart-wrap, body.compact canvas { height: 140px !important; max-height: 140px !important; }
  body.compact .control-btn { width: 100% !important; }
  body.compact .metric-card {
    max-width: none;
    min-height: 220px;
    --spark-pad: 18px;
  }
  body.compact .metric-card--throughput {
    min-height: 220px;
  }
  body.compact .metric-card--throughput .metric-panel {
    min-height: 200px;
  }
  body.compact .metric-readout {
    padding: 18px 18px 26px;
  }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.nav-open {
  overflow: hidden;
  touch-action: none;
}

.site-header {
  position: static;
}

.site-header__inner {
  padding: 20px 24px 14px;
}

.site-header__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-nav {
  gap: 14px 20px;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.site-nav__link {
  transition: color 0.2s ease;
}

.site-header__theme {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}

.site-header__theme:hover,
.site-header__theme:focus-visible {
  background: var(--surface-hover);
}

.site-nav__backdrop {
  position: fixed;
  inset: 0;
  background: rgba(8, 15, 35, 0.68);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.24s ease, visibility 0.24s ease;
  z-index: 35;
}

body.light .site-nav__backdrop {
  background: rgba(15, 23, 42, 0.28);
}

.site-nav__backdrop.is-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}


  .landing-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 72px;
    padding: 12px 0 104px;
  }

  .scroll-section {
    width: 100%;
  }

  .scroll-section__inner {
    width: min(1200px, 100%);
    margin: 0 auto;
    padding: 0 16px;
    display: grid;
    gap: 32px;
  }

  .scroll-section__inner--split {
    gap: 40px;
  }

  .scroll-section__header {
    display: grid;
    gap: 12px;
    max-width: 760px;
  }

  .scroll-eyebrow {
    font-size: 0.78rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--muted);
  }

  .scroll-title {
    font-size: clamp(2rem, 5vw, 3rem);
    line-height: 1.08;
    font-weight: 700;
  }

  .scroll-body {
    color: var(--muted);
    line-height: 1.7;
  }

  .hero-grid {
    display: grid;
    gap: clamp(28px, 5vw, 48px);
    align-items: center;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }

  .hero-lead {
    display: grid;
    gap: 18px;
  }

  .hero-title {
    font-size: clamp(2.4rem, 6vw, 3.6rem);
    line-height: 1.08;
    font-weight: 700;
  }

  .hero-body {
    color: var(--muted);
    line-height: 1.7;
    max-width: 640px;
  }

  .hero-list {
    margin: 0;
    padding-left: 1.25rem;
    display: grid;
    gap: 8px;
    color: var(--muted);
  }

  .hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
  }

  .hero-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid var(--border);
    color: var(--muted);
    font-weight: 600;
    letter-spacing: 0.02em;
  }

  .hero-secondary:hover,
  .hero-secondary:focus-visible {
    color: var(--fg);
    background: var(--surface-hover);
  }

  .hero-stack {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }

  .hero-card {
    padding: clamp(22px, 5vw, 30px);
    display: grid;
    gap: 12px;
  }

  .hero-card__title {
    font-size: 1rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }

  .hero-card__body {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--muted);
  }

  .feature-grid {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }

  .feature-card {
    padding: clamp(22px, 4vw, 28px);
    display: grid;
    gap: 12px;
  }

  .feature-card__title {
    font-size: 1.1rem;
    font-weight: 600;
  }

  .feature-card__body {
    line-height: 1.7;
    color: var(--muted);
  }

  .scroll-section--lab .scroll-section__header {
    max-width: none;
  }

  .scroll-section--lab .scroll-section__inner {
    gap: 12px;
  }

  .test-shell {
    display: grid;
    gap: 12px;
  }

  .cta-panel {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: clamp(22px, 4vw, 28px);
  }

  .cta-panel__content {
    display: grid;
    gap: 8px;
    max-width: 620px;
  }

  .cta-panel__title {
    font-size: 1.15rem;
    font-weight: 600;
  }

  .cta-panel__body {
    color: var(--muted);
    line-height: 1.6;
  }

  .timeline {
    display: grid;
    gap: 20px;
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .timeline__item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 20px;
    padding: clamp(20px, 4vw, 28px);
    align-items: start;
  }

  .timeline__badge {
    width: 40px;
    height: 40px;
    border-radius: 999px;
    border: 1px solid var(--border);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 0.08em;
  }

  .timeline__body {
    display: grid;
    gap: 8px;
  }

  .timeline__title {
    font-size: 1.1rem;
    font-weight: 600;
  }

  .timeline__body p {
    margin: 0;
    color: var(--muted);
    line-height: 1.7;
  }

  .assurance-grid {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

  .assurance-card {
    padding: clamp(22px, 4vw, 28px);
    display: grid;
    gap: 10px;
  }

  .assurance-card__title {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }

  .assurance-card__body {
    margin: 0;
    color: var(--muted);
    line-height: 1.7;
  }

  .privacy-list {
    display: grid;
    gap: 18px;
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .privacy-list__item {
    padding: clamp(22px, 4vw, 28px);
    display: grid;
    gap: 10px;
  }

  .privacy-list__title {
    font-size: 1.1rem;
    font-weight: 600;
  }

  .privacy-list__body {
    color: var(--muted);
    line-height: 1.7;
  }

  .support-grid {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

  .support-card {
    padding: clamp(22px, 4vw, 28px);
    display: grid;
    gap: 12px;
  }

  .support-card__list {
    margin: 0;
    padding-left: 1.1rem;
    display: grid;
    gap: 6px;
    color: var(--muted);
  }

  .support-card__body {
    color: var(--muted);
    line-height: 1.6;
  }

  .support-card__cta {
    margin: 0;
  }

  .support-card__cta a {
    color: var(--fg);
    font-weight: 600;
  }

  .support-footer {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    align-items: center;
    justify-content: space-between;
    padding: clamp(22px, 4vw, 30px);
  }

  .support-footer__copy {
    display: grid;
    gap: 8px;
    max-width: 620px;
  }

  .support-footer__title {
    font-size: 1.15rem;
    font-weight: 600;
  }

  .support-footer__body {
    color: var(--muted);
    line-height: 1.6;
  }

  .support-footer__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
  }


.test-shell {
  width: 100%;
  display: grid;
  gap: 12px;
}

.test-card {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-height: 72vh;
  overflow: hidden;
}

.test-card__body {
  flex: 1;
  overflow-y: auto;
}

@media (min-width: 1024px) {
  .landing-main {
    padding: 0 0 160px;
    gap: 160px;
  }

  .scroll-section__inner {
    padding: 0 32px;
  }

  .hero-grid {
    grid-template-columns: minmax(420px, 520px) minmax(320px, 1fr);
    column-gap: 64px;
    align-items: stretch;
  }

  .hero-stack {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .feature-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

  .timeline__item {
    padding: 32px;
    gap: 24px;
  }

  .assurance-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .scroll-section__inner--split {
    grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
    align-items: start;
  }

  .privacy-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .privacy-list__item {
    height: 100%;
  }

  .support-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .test-shell {
    padding: 0 32px;
  }

  .test-card {
    max-width: 960px;
    margin: 0 auto;
    max-height: none;
  }

  .test-card__body {
    overflow: visible;
  }

  .cta-panel,
  .support-footer {
    padding: 32px 36px;
  }

  .content-main {
    padding: 12px 32px 140px;
  }

  .content-shell {
    padding: 0 32px;
    gap: 36px;
  }

  .content-section {
    padding: 40px 48px;
    max-width: 960px;
    margin: 0 auto;
  }

  .section-intro {
    font-size: 1.05rem;
    line-height: 1.75;
  }
}

@media (min-width: 1440px) {
  .landing-main {
    padding-top: 12px;
    padding-bottom: 160px;
  }

  .scroll-section__inner {
    padding: 0;
  }

  .hero-grid {
    width: min(1280px, 100%);
    margin: 0 auto;
    column-gap: 80px;
  }

  .feature-grid,
  .assurance-grid,
  .support-grid,
  .privacy-list,
  .test-shell {
    width: min(1280px, 100%);
    margin: 0 auto;
  }

  .cta-panel,
  .support-footer {
    padding: 36px 40px;
  }

  .content-shell {
    max-width: 1080px;
  }

  .content-section {
    padding: 48px 56px;
  }
}

  @media (max-width: 900px) {
    .site-header__actions {
      gap: 12px;
    }

    .site-header__menu-toggle {
      display: inline-flex;
    }

    .site-nav {
      position: fixed;
      top: 0;
      right: 0;
      height: 100vh;
      width: min(300px, 82vw);
      padding: 112px 24px 32px;
      display: flex;
      flex-direction: column;
      align-items: stretch;
      gap: 16px;
      flex-wrap: nowrap;
      background: rgba(11, 18, 32, 0.96);
      border-left: 1px solid var(--border);
      box-shadow: -18px 0 48px -30px rgba(8, 15, 35, 0.85);
      transform: translateX(100%);
      opacity: 0;
      pointer-events: none;
      transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.24s ease;
      z-index: 60;
    }

    body.light .site-nav {
      background: rgba(248, 250, 252, 0.96);
      box-shadow: -18px 0 48px -32px rgba(15, 23, 42, 0.4);
    }

    .site-nav.is-open {
      transform: translateX(0);
      opacity: 1;
      pointer-events: auto;
    }

    .site-nav__link {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 100%;
      padding: 14px 18px;
      border-radius: 14px;
      border: 1px solid var(--border);
      background: var(--card);
      color: var(--fg);
      font-size: 0.82rem;
      font-weight: 700;
      letter-spacing: 0.12em;
    }

    .site-nav__link:hover,
    .site-nav__link:focus-visible {
      background: var(--surface-hover);
      color: var(--fg);
    }

    .landing-main {
      gap: 80px;
      padding-top: 12px;
    }

    .scroll-section__inner {
      padding: 0 20px;
    }

    .scroll-section__inner--split {
      grid-template-columns: 1fr;
    }

    .hero-grid,
    .hero-stack,
    .feature-grid,
    .assurance-grid,
    .support-grid,
    .privacy-list {
      grid-template-columns: 1fr;
    }
  }

@media (max-width: 640px) {
  .landing-main {
    gap: 64px;
    padding: 12px 12px 72px;
  }

  .site-header__actions {
    gap: 10px;
  }

  .site-header__menu-toggle {
    padding: 8px 16px;
  }

  .site-nav {
    width: min(280px, 88vw);
    padding: 96px 20px 28px;
    gap: 14px;
  }

  .hero-grid {
    gap: 28px;
  }

  .hero-lead {
    text-align: center;
    align-items: center;
  }

  .scroll-section__header {
    text-align: center;
    margin: 0 auto;
  }

  .hero-actions {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions a {
    width: 100%;
    justify-content: center;
  }

  .hero-stack,
  .feature-grid,
  .assurance-grid,
  .support-grid,
  .privacy-list {
    grid-template-columns: 1fr;
  }

  .scroll-section--lab .scroll-section__inner {
    padding-inline: 0;
  }

  .scroll-section--lab .scroll-section__header {
    padding-inline: 12px;
  }

  .scroll-section--lab .test-card {
    width: calc(100% + 24px);
    margin-inline: -12px;
  }

  .cta-panel,
  .support-footer {
    flex-direction: column;
    align-items: stretch;
  }
}

.site-footer--compact {
  border-top: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.55);
  padding: 24px 16px 40px;
}

body.light .site-footer--compact {
  background: rgba(248, 250, 252, 0.92);
}

.site-footer__inner {
  width: min(1200px, 100%);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
}

.site-footer__meta {
  flex: 1 1 220px;
}

.site-footer__links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  align-items: center;
}

.site-footer__links a {
  color: var(--muted);
}

.site-footer__links a:hover,
.site-footer__links a:focus-visible {
  color: var(--fg);
}

.site-footer__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
}

.site-footer__theme {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.site-footer__theme:hover,
.site-footer__theme:focus-visible {
  color: var(--fg);
  border-color: var(--fg);
  background: var(--surface-hover);
}

@media (max-width: 640px) {
  .content-shell {
    padding: 0 12px;
    gap: 20px;
  }

  .content-section {
    border-radius: 16px;
  }

  .section-intro {
    font-size: 0.95rem;
  }

  .faq-list {
    gap: 16px;
  }
}

@media (max-width: 640px) {
  .site-footer__inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 16px;
  }

  .site-footer__meta,
  .site-footer__links,
  .site-footer__actions {
    width: 100%;
  }

  .site-footer__links {
    justify-content: center;
  }

  .site-footer__actions {
    margin-left: 0;
    justify-content: center;
  }

  .site-footer__theme {
    width: 100%;
  }
}

@media (max-width: 1024px) {
  .landing-main {
    padding-top: 12px;
    align-items: stretch;
  }
  .landing-grid {
    grid-template-columns: 1fr;
  }
  .test-card {
    max-height: none;
  }
}

@media (max-width: 640px) {
  .landing-main {
    padding: 12px 12px 64px;
  }
  .site-header__inner {
    padding: 16px 14px 10px;
  }
}
.content-main {
  flex: 1;
  padding: 12px 16px 56px;
}

@media (max-width: 768px) {
  .content-main {
    padding: 12px 14px 44px;
  }
}

@media (max-width: 640px) {
  .content-main .test-card {
    width: calc(100% + 28px);
    margin-inline: -14px;
  }
}