:root {
  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html {
  scroll-behavior: smooth;
}

html[data-theme="obsidian"] {
  color-scheme: dark;
  --bg-base: #030508;
  --bg-elevated: rgba(10, 13, 18, 0.88);
  --bg-panel: rgba(16, 20, 27, 0.86);
  --bg-canvas: #040914;
  --text-primary: #f8fafc;
  --text-muted: #94a3b8;
  --border: rgba(148, 163, 184, 0.18);
  --accent: #7dd3fc;
  --accent-strong: #e0f2fe;
  --accent-soft: rgba(125, 211, 252, 0.14);
  --danger: #fb7185;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.34);
}

html[data-theme="lattice"] {
  color-scheme: dark;
  --bg-base: #060816;
  --bg-elevated: rgba(11, 18, 32, 0.9);
  --bg-panel: rgba(16, 26, 45, 0.88);
  --bg-canvas: #08101d;
  --text-primary: #f8fafc;
  --text-muted: #a8b3c7;
  --border: rgba(165, 180, 252, 0.18);
  --accent: #a5b4fc;
  --accent-strong: #eef2ff;
  --accent-soft: rgba(165, 180, 252, 0.18);
  --danger: #fb7185;
  --shadow: 0 24px 60px rgba(2, 6, 23, 0.42);
}

html[data-theme="porcelain"] {
  color-scheme: light;
  --bg-base: #f4f7fb;
  --bg-elevated: rgba(255, 255, 255, 0.92);
  --bg-panel: rgba(248, 250, 252, 0.94);
  --bg-canvas: #f3f7fb;
  --text-primary: #0f172a;
  --text-muted: #64748b;
  --border: rgba(148, 163, 184, 0.26);
  --accent: #0f766e;
  --accent-strong: #134e4a;
  --accent-soft: rgba(15, 118, 110, 0.1);
  --danger: #dc2626;
  --shadow: 0 22px 54px rgba(148, 163, 184, 0.2);
}

html[data-theme="frost"] {
  color-scheme: light;
  --bg-base: #eef5ff;
  --bg-elevated: rgba(255, 255, 255, 0.92);
  --bg-panel: rgba(248, 251, 255, 0.95);
  --bg-canvas: #eef6ff;
  --text-primary: #0f172a;
  --text-muted: #64748b;
  --border: rgba(96, 165, 250, 0.24);
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --danger: #e11d48;
  --shadow: 0 22px 54px rgba(59, 130, 246, 0.16);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, var(--accent-soft), transparent 28%),
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.04), transparent 20%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 40%),
    var(--bg-base);
  color: var(--text-primary);
  transition: background-color 180ms ease, color 180ms ease;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

canvas {
  display: block;
  width: 100%;
  height: 240px;
  image-rendering: crisp-edges;
}

.shell-header,
.shell-footer {
  background: color-mix(in srgb, var(--bg-elevated) 94%, transparent 6%);
  border-color: var(--border);
}

.shell-header {
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
}

.shell-footer {
  border-top: 1px solid var(--border);
  color: var(--text-muted);
}

.shell-header .eyebrow {
  font-size: 0.68rem;
}

.shell-header .badge {
  min-height: 1.45rem;
  padding: 0.16rem 0.5rem;
  font-size: 0.58rem;
}

.shell-header .theme-toggle {
  min-height: 40px;
  padding: 0.45rem 0.72rem;
  font-size: 0.64rem;
}

.shell-header .metrics-panel {
  line-height: 1.1;
}

.surface-card,
.subsurface-card,
.hero-card,
.signal-stat {
  border: 1px solid var(--border);
  border-radius: 1.15rem;
  transition: border-color 180ms ease, background-color 180ms ease, transform 180ms ease, color 180ms ease;
}

.surface-card,
.hero-card {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 24%),
    var(--bg-elevated);
  box-shadow: var(--shadow);
}

.subsurface-card,
.signal-stat {
  background: var(--bg-panel);
}

.hero-card {
  position: relative;
  overflow: hidden;
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: auto -10% -30% 35%;
  height: 14rem;
  background: radial-gradient(circle, var(--accent-soft), transparent 68%);
  pointer-events: none;
}

.section-head {
  border-bottom: 1px solid var(--border);
}

.section-title {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-title {
  margin: 0;
  max-width: 14ch;
  font-size: clamp(2rem, 6vw, 3.7rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
  font-weight: 700;
}

.hero-body,
.section-copy {
  max-width: 65ch;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.7;
}

.hero-body {
  font-size: 1.02rem;
}

.eyebrow,
.micro-copy,
.metrics-panel,
.muted-text,
.signal-stat-label {
  color: var(--text-muted);
}

.eyebrow,
.micro-copy {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.accent-text {
  color: var(--accent);
}

.badge,
.signal-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 2rem;
  padding: 0.4rem 0.78rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-panel);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.signal-pill {
  min-height: 2.1rem;
  font-size: 0.68rem;
}

.badge-accent {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border) 55%);
}

.signal-stat {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 8.5rem;
  padding: 1rem;
  position: relative;
  overflow: hidden;
}

.signal-stat::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, var(--accent-soft), transparent 60%);
  opacity: 0.9;
  pointer-events: none;
}

.signal-stat-value,
.signal-stat-label {
  position: relative;
  z-index: 1;
}

.signal-stat-value {
  color: var(--accent-strong);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.signal-stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.themed-canvas {
  background: var(--bg-canvas);
  border: 1px solid var(--border);
  border-radius: 0.95rem;
}

.tab-btn,
.theme-toggle,
.action-btn,
.secondary-btn {
  min-height: 44px;
  border-radius: 0.9rem;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text-muted);
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.tab-btn,
.secondary-btn {
  padding: 0.65rem 0.9rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.action-btn {
  width: 100%;
  padding: 0.9rem 1rem;
  background: linear-gradient(180deg, var(--accent-soft), transparent), var(--bg-panel);
  color: var(--text-primary);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero-secondary {
  justify-content: center;
}

.tab-btn:hover,
.theme-toggle:hover,
.action-btn:hover,
.secondary-btn:hover,
.hover-accent:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.tab-btn.active {
  color: var(--text-primary);
  border-color: var(--accent);
  background: linear-gradient(180deg, var(--accent-soft), transparent), var(--bg-panel);
}

.secondary-btn:disabled,
.action-btn:disabled {
  opacity: 0.72;
  cursor: wait;
}

.terminal-log {
  min-height: 220px;
  overflow-y: auto;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.95rem;
  background: var(--bg-canvas);
  font-size: 0.76rem;
  line-height: 1.55;
}

.terminal-line {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  color: var(--text-muted);
}

.terminal-line + .terminal-line {
  margin-top: 0.4rem;
}

.terminal-line-marker {
  color: var(--accent);
  font-weight: 700;
}

.hidden {
  display: none;
}

@media (max-width: 1024px) {
  .hero-title {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .section-title {
    font-size: 0.74rem;
  }

  .hero-card,
  .surface-card {
    border-radius: 1rem;
  }

  .hero-body,
  .section-copy {
    font-size: 0.94rem;
  }

  .tab-btn,
  .secondary-btn {
    flex: 1 1 calc(50% - 0.5rem);
  }

  .signal-stat {
    min-height: 7.2rem;
  }
}

@media (max-width: 520px) {
  .hero-title {
    font-size: 2rem;
  }

  .signal-stat-value {
    font-size: 1.2rem;
  }

  .tab-btn,
  .secondary-btn,
  .action-btn,
  .theme-toggle {
    min-height: 46px;
  }
}