:root,
    html[data-theme="dark"] {
      color-scheme: dark;
      --bg-base: #141a22;
      --bg-elevated: #1b2431;
      --bg-panel: rgba(22, 31, 44, 0.82);
      --bg-panel-strong: rgba(16, 24, 36, 0.92);
      --bg-subtle: rgba(255, 255, 255, 0.04);
      --bg-subtle-strong: rgba(255, 255, 255, 0.06);
      --bg-header: rgba(20, 27, 38, 0.8);
      --bg-code: rgba(11, 18, 28, 0.84);
      --bg-hero-a: rgba(99, 161, 255, 0.16);
      --bg-hero-b: rgba(141, 118, 255, 0.08);
      --bg-warm: rgba(246, 150, 186, 0.08);
      --text: #edf4ff;
      --muted: #92a2b7;
      --soft: #c8d5e6;
      --accent: #c6d9fb;
      --accent-strong: #eef4ff;
      --warning-text: #ffe1ca;
      --warning-surface: rgba(166, 104, 77, 0.14);
      --warning-border: rgba(223, 159, 133, 0.2);
      --success-surface: rgba(91, 147, 121, 0.14);
      --success-border: rgba(142, 203, 173, 0.2);
      --mark-text: #09111b;
      --line: rgba(188, 207, 236, 0.12);
      --line-strong: rgba(188, 207, 236, 0.18);
      --grid-line: rgba(255, 255, 255, 0.03);
      --screen-mask: linear-gradient(180deg, rgba(0, 0, 0, 0.42), transparent 92%);
      --shadow: 0 20px 60px rgba(7, 12, 21, 0.34);
      --radius-xl: 28px;
      --radius-lg: 22px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --max-width: 1240px;
      --nav-height: 74px;
      --button-bg: linear-gradient(180deg, #edf4ff 0%, #cfdef7 100%);
      --button-text: #0d1725;
      --button-hover: linear-gradient(180deg, #ffffff 0%, #dbe7fa 100%);
      --mono: "SFMono-Regular", "SF Mono", ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
      --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    }

    html[data-theme="light"] {
      color-scheme: light;
      --bg-base: #e9eef5;
      --bg-elevated: #f6f9fd;
      --bg-panel: rgba(255, 255, 255, 0.88);
      --bg-panel-strong: rgba(249, 251, 255, 0.96);
      --bg-subtle: rgba(31, 49, 74, 0.04);
      --bg-subtle-strong: rgba(31, 49, 74, 0.06);
      --bg-header: rgba(241, 245, 251, 0.86);
      --bg-code: rgba(242, 246, 251, 0.9);
      --bg-hero-a: rgba(99, 161, 255, 0.12);
      --bg-hero-b: rgba(141, 118, 255, 0.05);
      --bg-warm: rgba(246, 150, 186, 0.04);
      --text: #182435;
      --muted: #5d7088;
      --soft: #2b3b52;
      --accent: #35557a;
      --accent-strong: #203754;
      --warning-text: #8c4a32;
      --warning-surface: rgba(166, 104, 77, 0.12);
      --warning-border: rgba(166, 104, 77, 0.18);
      --success-surface: rgba(91, 147, 121, 0.12);
      --success-border: rgba(91, 147, 121, 0.18);
      --mark-text: #f5f9ff;
      --line: rgba(40, 61, 89, 0.1);
      --line-strong: rgba(40, 61, 89, 0.16);
      --grid-line: rgba(27, 43, 65, 0.05);
      --screen-mask: linear-gradient(180deg, rgba(0, 0, 0, 0.42), transparent 92%);
      --shadow: 0 20px 60px rgba(35, 53, 78, 0.12);
      --button-bg: linear-gradient(180deg, #203754 0%, #35557a 100%);
      --button-text: #f5f9ff;
      --button-hover: linear-gradient(180deg, #274061 0%, #416489 100%);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: var(--sans);
      color: var(--text);
      background:
        radial-gradient(circle at top left, var(--bg-hero-a), transparent 34%),
        radial-gradient(circle at top right, var(--bg-warm), transparent 24%),
        linear-gradient(180deg, var(--bg-base) 0%, var(--bg-elevated) 100%);
      min-height: 100vh;
      line-height: 1.55;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
      background-size: 64px 64px;
      mask-image: var(--screen-mask);
      opacity: 0.35;
    }

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

    img {
      max-width: 100%;
      display: block;
    }

    .shell {
      width: min(calc(100% - 32px), var(--max-width));
      margin: 0 auto;
    }

    .topbar {
      position: sticky;
      top: 0;
      z-index: 10;
      backdrop-filter: blur(18px);
      background: var(--bg-header);
      border-bottom: 1px solid var(--line);
    }

    .topbar-inner {
      min-height: var(--nav-height);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .brand {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .eyebrow,
    .kicker {
      color: var(--accent);
      text-transform: uppercase;
      letter-spacing: 0.16em;
      font-size: 0.75rem;
      font-weight: 700;
    }

    .brand strong {
      font-size: 1rem;
      font-weight: 650;
    }

    .nav {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-wrap: wrap;
      justify-content: flex-end;
    }

    .mobile-menu-toggle,
    .mobile-drawer-close {
      display: none;
      align-items: center;
      justify-content: center;
      gap: 10px;
      min-height: 3rem;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: var(--bg-subtle);
      color: var(--text);
      cursor: pointer;
      font: inherit;
      transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    }

    .mobile-menu-toggle:hover,
    .mobile-menu-toggle:focus-visible,
    .mobile-drawer-close:hover,
    .mobile-drawer-close:focus-visible {
      background: var(--bg-subtle-strong);
      border-color: var(--line-strong);
      outline: none;
      transform: translateY(-1px);
    }

    .mobile-menu-toggle {
      padding: 0 1rem;
      white-space: nowrap;
    }

    .mobile-menu-icon {
      display: inline-grid;
      gap: 4px;
    }

    .mobile-menu-icon span {
      width: 18px;
      height: 2px;
      border-radius: 999px;
      background: currentColor;
    }

    .mobile-menu-label {
      font-size: 0.88rem;
      font-weight: 700;
      letter-spacing: 0.02em;
    }

    .mobile-drawer {
      position: fixed;
      inset: 0;
      z-index: 60;
      display: none;
      pointer-events: none;
    }

    .mobile-drawer[aria-hidden="false"] {
      pointer-events: auto;
    }

    .mobile-drawer-backdrop {
      position: absolute;
      inset: 0;
      border: 0;
      background: rgba(6, 10, 18, 0.58);
      opacity: 0;
      transition: opacity 0.24s ease;
    }

    .mobile-drawer-panel {
      position: absolute;
      top: 0;
      right: 0;
      display: grid;
      grid-template-rows: auto 1fr auto;
      gap: 18px;
      width: min(70vw, 380px);
      max-width: 70vw;
      height: 100dvh;
      padding: 22px 18px 24px;
      border-left: 1px solid var(--line-strong);
      background:
        radial-gradient(circle at top right, var(--bg-hero-a), transparent 26%),
        linear-gradient(180deg, var(--bg-panel-strong), var(--bg-panel));
      box-shadow: var(--shadow);
      transform: translateX(100%);
      transition: transform 0.24s ease;
      overflow: hidden;
    }

    .mobile-drawer[aria-hidden="false"] .mobile-drawer-backdrop {
      opacity: 1;
    }

    .mobile-drawer[aria-hidden="false"] .mobile-drawer-panel {
      transform: translateX(0);
    }

    .mobile-drawer-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
    }

    .mobile-drawer-close {
      display: inline-flex;
      width: 3rem;
      min-width: 3rem;
      padding: 0;
      font-size: 1.4rem;
      line-height: 1;
    }

    .mobile-drawer-links {
      display: grid;
      align-content: start;
      gap: 10px;
      overflow-y: auto;
      padding-right: 4px;
    }

    .mobile-drawer-link,
    .mobile-launch-cta {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      min-height: 3.25rem;
      padding: 0.95rem 1rem;
      border-radius: 18px;
      border: 1px solid var(--line);
      text-decoration: none;
      transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    }

    .mobile-drawer-link {
      background: var(--bg-subtle);
      color: var(--soft);
      font-weight: 700;
    }

    .mobile-drawer-link:hover,
    .mobile-drawer-link:focus-visible {
      background: var(--bg-subtle-strong);
      border-color: var(--line-strong);
      color: var(--text);
      transform: translateY(-1px);
      outline: none;
    }

    .mobile-drawer-footer {
      display: grid;
      gap: 12px;
      padding-top: 6px;
    }

    .mobile-launch-cta {
      justify-content: center;
      background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.24), transparent 32%),
        linear-gradient(135deg, #73a2ff 0%, #4d87ff 36%, #7e72ff 100%);
      color: #ffffff;
      font-weight: 800;
      box-shadow:
        0 18px 38px rgba(80, 116, 255, 0.32),
        0 0 0 1px rgba(255, 255, 255, 0.14) inset;
    }

    .mobile-launch-cta:hover,
    .mobile-launch-cta:focus-visible {
      transform: translateY(-1px);
      outline: none;
      box-shadow:
        0 22px 44px rgba(80, 116, 255, 0.4),
        0 0 42px rgba(99, 161, 255, 0.18);
    }

    body.menu-open {
      overflow: hidden;
    }

    .nav a,
    .theme-switch {
      color: var(--muted);
      font-size: 0.92rem;
      padding: 0.9rem 1rem;
      min-height: 3rem;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: var(--bg-subtle);
      transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
      cursor: pointer;
      font: inherit;
    }

    .nav a:hover,
    .nav a:focus-visible,
    .theme-switch:hover,
    .theme-switch:focus-visible {
      background: var(--bg-subtle-strong);
      color: var(--text);
      border-color: var(--line-strong);
      outline: none;
    }

    .theme-switch {
      min-width: 8.5rem;
    }

    main {
      padding: 28px 0 72px;
    }

    section {
      margin-top: 28px;
    }

    .section-block {
      margin-top: 18px;
    }

    .hero,
    .section-panel,
    .footer-panel {
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

    .hero {
      position: relative;
      overflow: hidden;
      padding: 48px;
      border-radius: 34px;
      background:
        radial-gradient(circle at 0% 0%, var(--bg-hero-a), transparent 28%),
        radial-gradient(circle at 100% 0%, var(--bg-hero-b), transparent 18%),
        linear-gradient(180deg, var(--bg-panel-strong), var(--bg-panel));
    }

    .hero::after {
      content: "";
      position: absolute;
      right: -140px;
      top: -120px;
      width: 360px;
      height: 360px;
      border-radius: 50%;
      background: radial-gradient(circle, var(--bg-hero-a), transparent 70%);
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.4fr 0.9fr;
      gap: 28px;
      align-items: start;
    }

    .hero h1 {
      margin: 10px 0 10px;
      font-size: clamp(2.6rem, 5vw, 4.8rem);
      line-height: 0.98;
      letter-spacing: -0.04em;
      max-width: 10ch;
    }

    .hero h1 span {
      color: var(--accent-strong);
      display: block;
    }

    .subtitle {
      margin: 0;
      color: var(--soft);
      font-size: clamp(1.08rem, 2vw, 1.3rem);
      font-weight: 600;
    }

    .hero-copy,
    .hero-aside p,
    .section-head p,
    .goal-card p,
    .stack-card p,
    .spec-card p,
    .mock-card p,
    .warning-card p,
    .check-card p,
    .success-card p,
    .page-card p,
    .list-card p,
    .footer-panel p {
      color: var(--muted);
    }

    .hero-copy {
      margin-top: 18px;
      max-width: 62ch;
      font-size: 1.05rem;
    }

    .phase-jump-panel {
      display: grid;
      gap: 24px;
      padding: 28px 30px;
      border-radius: var(--radius-xl);
      border: 1px solid var(--line-strong);
      background:
        radial-gradient(circle at top right, var(--bg-hero-a), transparent 22%),
        linear-gradient(180deg, var(--bg-panel-strong), var(--bg-panel));
      box-shadow: var(--shadow);
    }

    .phase-jump-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 18px;
    }

    .phase-jump-head h2 {
      margin: 8px 0 0;
      font-size: clamp(1.4rem, 2vw, 1.85rem);
      letter-spacing: -0.03em;
    }

    .phase-jump-head p,
    .phase-launch-note,
    .phase-link-meta {
      color: var(--muted);
    }

    .phase-link-grid {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 14px;
    }

    .phase-link-card {
      position: relative;
      display: grid;
      gap: 10px;
      min-height: 148px;
      padding: 18px;
      border-radius: 22px;
      border: 1px solid var(--line);
      background: linear-gradient(180deg, var(--bg-subtle-strong), var(--bg-subtle));
      transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease, box-shadow 0.22s ease;
    }

    .phase-link-card:hover,
    .phase-link-card:focus-visible {
      transform: translateY(-2px);
      border-color: var(--line-strong);
      background: linear-gradient(180deg, var(--bg-panel-strong), var(--bg-subtle-strong));
      box-shadow: 0 18px 40px rgba(7, 12, 21, 0.18);
      outline: none;
    }

    .phase-link-card.is-active {
      border-color: var(--line-strong);
      background:
        radial-gradient(circle at top right, var(--bg-hero-a), transparent 30%),
        linear-gradient(180deg, var(--bg-panel-strong), var(--bg-subtle-strong));
      box-shadow: 0 18px 44px rgba(7, 12, 21, 0.22);
    }

    .phase-link-card.is-active::after {
      content: "Current phase";
      position: absolute;
      top: 16px;
      right: 16px;
      padding: 5px 9px;
      border-radius: 999px;
      background: var(--button-bg);
      color: var(--button-text);
      font-size: 0.72rem;
      font-weight: 800;
      letter-spacing: 0.02em;
    }

    .phase-link-label {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      width: fit-content;
      padding: 7px 10px;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: var(--bg-subtle);
      color: var(--soft);
      font-size: 0.76rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .phase-link-card strong {
      margin: 0;
      padding-right: 72px;
      font-size: 1rem;
      line-height: 1.2;
    }

    .phase-link-meta {
      margin: 0;
      font-size: 0.93rem;
      line-height: 1.5;
    }

    .phase-launch-shell {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding-top: 4px;
    }

    .launch-command-cta {
      position: relative;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      min-height: 3.75rem;
      padding: 0.95rem 1.6rem;
      border-radius: 999px;
      background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.24), transparent 32%),
        linear-gradient(135deg, #73a2ff 0%, #4d87ff 36%, #7e72ff 100%);
      color: #ffffff;
      font-size: 0.98rem;
      font-weight: 800;
      letter-spacing: -0.01em;
      box-shadow:
        0 18px 38px rgba(80, 116, 255, 0.32),
        0 0 0 1px rgba(255, 255, 255, 0.14) inset;
      transition: transform 0.22s ease, box-shadow 0.22s ease, filter 0.22s ease;
      white-space: nowrap;
    }

    .launch-command-cta:hover,
    .launch-command-cta:focus-visible {
      transform: translateY(-2px) scale(1.01);
      box-shadow:
        0 22px 44px rgba(80, 116, 255, 0.4),
        0 0 0 1px rgba(255, 255, 255, 0.18) inset,
        0 0 42px rgba(99, 161, 255, 0.18);
      filter: brightness(1.03);
      outline: none;
    }

    .phase-launch-copy {
      display: grid;
      gap: 6px;
    }

    .phase-launch-copy strong {
      margin: 0;
      font-size: 1rem;
      letter-spacing: -0.02em;
    }

    .hero-aside,
    .section-panel,
    .footer-panel,
    .tree,
    .frame,
    .highlight-panel {
      background: var(--bg-panel);
    }

    .hero-aside {
      padding: 22px;
      border-radius: 24px;
      border: 1px solid var(--line);
    }

    .hero-aside h2,
    .section-head h2 {
      margin: 0;
      font-size: clamp(1.4rem, 2vw, 1.8rem);
      letter-spacing: -0.03em;
    }

    .badge-cluster,
    .inline-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .badge,
    .goal-index,
    .stack-label,
    .card-tag,
    .inline-pill,
    .route-method,
    .env-key {
      border-radius: 999px;
      border: 1px solid var(--line);
      background: var(--bg-subtle);
      color: var(--soft);
      font-weight: 650;
    }

    .badge {
      padding: 10px 14px;
      font-size: 0.87rem;
      letter-spacing: 0.01em;
    }

    .section-panel {
      padding: 30px;
      border-radius: var(--radius-xl);
    }

    .section-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 16px;
      margin-bottom: 22px;
    }

    .section-head p {
      margin: 8px 0 0;
      max-width: 62ch;
    }

    .grid {
      display: grid;
      gap: 18px;
    }

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

    .grid-2 {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .goal-card,
    .stack-card,
    .spec-card,
    .mock-card,
    .warning-card,
    .check-card,
    .success-card,
    .page-card {
      position: relative;
      padding: 20px 20px 18px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--line);
      background: linear-gradient(180deg, var(--bg-subtle-strong), var(--bg-subtle));
    }

    .goal-card::before,
    .stack-card::before,
    .spec-card::before,
    .mock-card::before,
    .warning-card::before,
    .check-card::before,
    .success-card::before,
    .page-card::before {
      content: "";
      position: absolute;
      inset: 0 0 auto 0;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
    }

    .goal-card strong,
    .stack-card strong,
    .spec-card strong,
    .mock-card strong,
    .warning-card strong,
    .check-card strong,
    .success-card strong,
    .page-card strong,
    .panel-shell strong,
    .footer-panel strong {
      display: block;
      font-size: 1rem;
      margin-bottom: 6px;
      letter-spacing: -0.02em;
      color: var(--text);
    }

    .goal-index,
    .stack-label,
    .card-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 14px;
      padding: 6px 10px;
      font-size: 0.78rem;
    }

    .stack-card ul,
    .spec-card ul,
    .page-card ul,
    .check-card ul {
      margin: 14px 0 0;
      padding-left: 18px;
      color: var(--soft);
    }

    .stack-card li,
    .spec-card li,
    .page-card li,
    .check-card li {
      margin: 8px 0;
    }

    .tree {
      margin: 0;
      padding: 24px;
      border-radius: 24px;
      border: 1px solid var(--line);
      color: var(--soft);
      font-family: var(--mono);
      font-size: 0.95rem;
      line-height: 1.8;
      overflow-x: auto;
      white-space: pre;
    }

    .requirements {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 18px;
    }

    .spec-card h3 {
      margin: 0 0 10px;
      font-size: 1.12rem;
      letter-spacing: -0.02em;
    }

    .inline-pill {
      padding: 8px 10px;
      font-size: 0.84rem;
    }

    .route-list,
    .env-list {
      display: grid;
      gap: 10px;
      margin-top: 14px;
    }

    .route-item,
    .env-item {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 10px 12px;
      align-items: start;
      padding: 10px 12px;
      border-radius: 14px;
      background: var(--bg-subtle);
      border: 1px solid var(--line);
    }

    .route-method,
    .env-key {
      font-family: var(--mono);
      font-size: 0.82rem;
      padding: 4px 8px;
      font-weight: 700;
      white-space: nowrap;
    }

    .route-path,
    .env-value {
      color: var(--soft);
      font-family: var(--mono);
      font-size: 0.9rem;
    }

    .highlight-panel {
      padding: 26px;
      border-radius: 24px;
      border: 1px solid var(--line-strong);
      background:
        radial-gradient(circle at top right, var(--bg-hero-a), transparent 25%),
        linear-gradient(180deg, var(--bg-panel-strong), var(--bg-panel));
    }

    .highlight-panel p {
      margin: 0;
      color: var(--soft);
      font-size: 1rem;
    }

    .warning-card {
      background: linear-gradient(180deg, var(--warning-surface), var(--bg-subtle));
      border-color: var(--warning-border);
    }

    .warning-card strong {
      color: var(--warning-text);
    }

    .success-card {
      background: linear-gradient(180deg, var(--success-surface), var(--bg-subtle));
      border-color: var(--success-border);
    }

    .ui-mock {
      display: grid;
      gap: 14px;
      margin-top: 16px;
    }

    .frame {
      border-radius: 18px;
      border: 1px solid var(--line);
      overflow: hidden;
    }

    .frame-top {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 12px 14px;
      border-bottom: 1px solid var(--line);
      background: var(--bg-subtle);
    }

    .dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--line-strong);
    }

    .frame-body {
      padding: 18px;
      display: grid;
      gap: 14px;
    }

    .input-shell,
    .panel-shell,
    .stream-line {
      border-radius: 14px;
      border: 1px solid var(--line);
      background: var(--bg-subtle);
    }

    .input-shell {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 12px;
      padding: 10px;
    }

    .ghost-input {
      padding: 14px 16px;
      border-radius: 10px;
      color: var(--soft);
      background: var(--bg-subtle);
      border: 1px solid var(--line);
    }

    .ghost-button {
      padding: 14px 18px;
      border-radius: 999px;
      color: var(--button-text);
      background: var(--button-bg);
      font-weight: 800;
      white-space: nowrap;
    }

    .panel-shell {
      padding: 16px;
    }

    .stream-line {
      padding: 12px 14px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
    }

    .stream-line span {
      color: var(--muted);
      font-family: var(--mono);
      font-size: 0.88rem;
    }

    .checklist {
      display: grid;
      gap: 14px;
    }

    .check-card strong,
    .success-card strong {
      margin-bottom: 8px;
    }

    .check-mark,
    .success-mark {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 28px;
      height: 28px;
      margin-bottom: 12px;
      border-radius: 50%;
      font-weight: 800;
      color: var(--mark-text);
      background: var(--button-bg);
    }

    footer {
      padding: 18px 0 28px;
    }

    .footer-panel {
      padding: 26px 28px;
      border-radius: 28px;
      text-align: center;
      background: linear-gradient(180deg, var(--bg-panel-strong), var(--bg-panel));
    }

    .quote {
      margin-top: 16px;
      color: var(--soft);
      font-weight: 600;
      letter-spacing: 0.02em;
    }

    @media (max-width: 1080px) {
      .hero-grid,
      .grid-3,
      .requirements,
      .phase-link-grid {
        grid-template-columns: 1fr;
      }

      .grid-2 {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 760px) {
      :root {
        --nav-height: auto;
      }

      .section-head,
      .phase-jump-head,
      .phase-launch-shell {
        align-items: start;
        flex-direction: column;
      }

      .topbar-inner {
        min-height: 74px;
        flex-direction: row;
        align-items: center;
      }

      .nav {
        display: none;
      }

      .mobile-menu-toggle,
      .mobile-drawer {
        display: block;
      }

      .mobile-menu-toggle {
        display: inline-flex;
      }

      .hero,
      .section-panel,
      .phase-jump-panel,
      .footer-panel {
        padding: 24px;
      }

      .hero h1 {
        max-width: none;
      }

      .input-shell,
      .route-item,
      .env-item {
        grid-template-columns: 1fr;
      }

      .phase-link-card strong {
        padding-right: 0;
      }

      .phase-link-card.is-active::after {
        position: static;
        width: fit-content;
      }

      .launch-command-cta {
        width: 100%;
      }
    }