:root {
  --bg: #07111f;
  --bg-elevated: rgba(15, 23, 42, 0.78);
  --card: rgba(13, 22, 38, 0.82);
  --card-strong: #0f172a;
  --text: #e5edf8;
  --muted: #9fb0c8;
  --line: rgba(148, 163, 184, 0.18);
  --primary: #7c9cff;
  --primary-strong: #5d80ff;
  --accent-red: #ff7d7d;
  --accent-blue: #67d2ff;
  --accent-green: #74e0ae;
  --accent-amber: #ffcf70;
  --shadow: 0 30px 80px rgba(2, 6, 23, 0.45);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background:
    radial-gradient(circle at top left, rgba(93, 128, 255, 0.24), transparent 26%),
    radial-gradient(circle at top right, rgba(103, 210, 255, 0.18), transparent 22%),
    linear-gradient(180deg, #08111f 0%, #091726 48%, #0c1423 100%);
  color: var(--text);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.9), transparent 90%);
}

.page-shell {
  width: min(1200px, calc(100% - 40px));
  margin: 0 auto;
  padding-bottom: 80px;
}

.hero {
  padding: 24px 0 24px;
}

.topbar,
.hero-grid,
.section-head,
.card-grid,
.tab-bar,
.timeline,
.module-board,
.dose-grid,
.screen-layout,
.data-grid,
.roadmap-grid,
.prototype-stack,
.wireframe-grid,
.flow-grid,
.tab-wireframe,
.cta-row {
  display: grid;
  gap: 20px;
}

.topbar {
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 10px 0 24px;
}

.eyebrow,
.section-kicker,
.badge,
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  border: 1px solid rgba(124, 156, 255, 0.24);
  background: rgba(124, 156, 255, 0.09);
  color: #d9e3ff;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand {
  margin-top: 10px;
  font-size: 24px;
  font-weight: 800;
}

.topbar-actions,
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.primary-btn,
.ghost-btn,
.tab-btn {
  border: 0;
  text-decoration: none;
  cursor: pointer;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.primary-btn {
  color: white;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-strong) 100%);
  box-shadow: 0 10px 35px rgba(93, 128, 255, 0.36);
}

.ghost-btn,
.tab-btn {
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
}

.primary-btn:hover,
.ghost-btn:hover,
.tab-btn:hover {
  transform: translateY(-1px);
}

.hero-grid {
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.9fr);
  align-items: stretch;
  margin-top: 18px;
}

.hero h1 {
  margin: 18px 0 16px;
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.04;
}

.hero-copy,
.section-head p,
.info-card li,
.feature-card li,
.timeline-item p,
.module-card p,
.principle-card p,
.screen-column li,
.data-card p,
.roadmap-card p,
.question-item span,
.hero-panel p {
  color: var(--muted);
  line-height: 1.75;
}

.glass-card,
.info-card,
.feature-card,
.principle-card,
.data-card,
.roadmap-card,
.question-list {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.84), rgba(12, 19, 34, 0.92));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 26px;
}

.panel-title {
  font-size: 14px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.metric-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.metric-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(148, 163, 184, 0.14);
  border-radius: 18px;
  padding: 18px;
}

.metric-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 8px;
}

.metric-card strong {
  font-size: 18px;
}

.section {
  padding: 26px 0 12px;
}

.section-head {
  grid-template-columns: 1fr minmax(260px, 420px);
  align-items: end;
  margin-bottom: 22px;
}

.section-head h2 {
  margin: 12px 0 0;
  font-size: clamp(28px, 4vw, 42px);
}

.card-grid.four-up {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card-grid.three-up,
.module-board,
.data-grid,
.roadmap-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card-grid.two-up,
.screen-layout,
.dose-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.info-card,
.feature-card,
.principle-card,
.data-card,
.roadmap-card,
.screen-column {
  padding: 24px;
}

.info-card h3,
.feature-card h3,
.principle-card h3,
.screen-column h3,
.roadmap-card h3,
.module-card h3,
.data-card h3 {
  margin: 0 0 12px;
  font-size: 20px;
}

.info-card ul,
.feature-card ul,
.screen-column ol {
  margin: 0;
  padding-left: 18px;
}

.info-card li + li,
.feature-card li + li,
.screen-column li + li {
  margin-top: 8px;
}

.accent-red { border-top: 3px solid var(--accent-red); }
.accent-blue { border-top: 3px solid var(--accent-blue); }
.accent-amber { border-top: 3px solid var(--accent-amber); }
.accent-green { border-top: 3px solid var(--accent-green); }

.tab-bar {
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  margin-bottom: 18px;
}

.tab-btn.active {
  background: rgba(124, 156, 255, 0.18);
  border-color: rgba(124, 156, 255, 0.32);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

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

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 18px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(8, 15, 28, 0.56);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 43px;
  top: 100%;
  width: 2px;
  height: 20px;
  background: linear-gradient(180deg, rgba(124, 156, 255, 0.4), transparent);
}

.timeline-item:last-child::before {
  display: none;
}

.timeline-index {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 18px;
  font-weight: 800;
  font-size: 22px;
  background: rgba(124, 156, 255, 0.16);
  color: #dbe6ff;
  border: 1px solid rgba(124, 156, 255, 0.3);
}

.module-board {
  gap: 18px;
}

.module-card {
  position: relative;
  padding: 24px;
}

.module-card .tag {
  margin-top: 10px;
}

.data-grid,
.module-board,
.roadmap-grid {
  align-items: stretch;
}

.data-card,
.roadmap-card {
  min-height: 160px;
}

.question-list {
  padding: 8px 22px;
}

.question-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}

.question-item:last-child {
  border-bottom: 0;
}

.question-item strong,
.roadmap-card span {
  color: #dbe6ff;
}

.prototype-stack {
  grid-template-columns: 1fr;
}

.prototype-card {
  padding: 24px;
}

.prototype-head {
  display: grid;
  grid-template-columns: 1fr minmax(240px, 380px);
  gap: 18px;
  align-items: start;
  margin-bottom: 18px;
}

.prototype-head h3,
.flow-card h4,
.phone-title {
  margin: 10px 0 0;
}

.prototype-notes {
  margin: 18px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.8;
}

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

.tab-wireframe {
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
}

.tab-pill,
.mini-btn,
.wire-block,
.flow-card,
.phone-frame {
  border: 1px solid rgba(148, 163, 184, 0.16);
}

.tab-pill {
  border-radius: 16px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.03);
  text-align: center;
  font-weight: 700;
}

.tab-pill.active {
  background: rgba(124, 156, 255, 0.18);
  border-color: rgba(124, 156, 255, 0.34);
}

.tab-pill.muted {
  color: var(--muted);
}

.phone-frame {
  background: rgba(5, 11, 23, 0.7);
  border-radius: 26px;
  padding: 18px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}

.phone-frame.full {
  max-width: 520px;
}

.phone-title {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 14px;
}

.wire-block {
  border-radius: 14px;
  padding: 14px 16px;
  background: rgba(255,255,255,0.03);
  color: var(--text);
  margin-top: 12px;
}

.wire-block.strong {
  background: rgba(124, 156, 255, 0.14);
  border-color: rgba(124, 156, 255, 0.28);
}

.wire-block.accent {
  background: rgba(116, 224, 174, 0.12);
  border-color: rgba(116, 224, 174, 0.26);
}

.wire-block.muted {
  color: var(--muted);
}

.cta-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 12px;
}

.mini-btn {
  border-radius: 14px;
  padding: 12px 10px;
  text-align: center;
  font-weight: 700;
  background: rgba(255,255,255,0.03);
}

.mini-btn.success { background: rgba(116, 224, 174, 0.14); border-color: rgba(116, 224, 174, 0.3); }
.mini-btn.warn { background: rgba(255, 207, 112, 0.14); border-color: rgba(255, 207, 112, 0.3); }
.mini-btn.danger { background: rgba(255, 125, 125, 0.14); border-color: rgba(255, 125, 125, 0.3); }

.flow-card {
  border-radius: 20px;
  padding: 22px;
  background: rgba(255,255,255,0.03);
}

.flow-card ol {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.8;
}

.roadmap-card span {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

@media (max-width: 1080px) {
  .hero-grid,
  .section-head,
  .card-grid.four-up,
  .card-grid.three-up,
  .card-grid.two-up,
  .module-board,
  .dose-grid,
  .screen-layout,
  .data-grid,
  .roadmap-grid,
  .wireframe-grid.two,
  .flow-grid {
    grid-template-columns: 1fr 1fr;
  }

  .prototype-head {
    grid-template-columns: 1fr;
  }

  .section-head {
    align-items: start;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100% - 24px, 1200px);
  }

  .topbar,
  .hero-grid,
  .section-head,
  .card-grid.four-up,
  .card-grid.three-up,
  .card-grid.two-up,
  .module-board,
  .dose-grid,
  .screen-layout,
  .data-grid,
  .roadmap-grid,
  .metric-grid,
  .wireframe-grid.two,
  .flow-grid,
  .tab-wireframe,
  .cta-row {
    grid-template-columns: 1fr;
  }

  .topbar-actions,
  .hero-actions {
    width: 100%;
  }

  .tab-bar {
    grid-auto-flow: row;
    grid-auto-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

  .timeline-item::before {
    display: none;
  }
}