/* Orbitarium — shared theme */
:root {
  --bg: #0b1020;
  --bg-elev: #121a30;
  --bg-elev-2: #182240;
  --surface: #1a2442;
  --border: rgba(148, 176, 220, 0.16);
  --border-strong: rgba(148, 176, 220, 0.28);
  --text: #e8eef9;
  --text-muted: #9aabc8;
  --text-dim: #6d7f9e;
  --primary: #5eb8ff;
  --primary-hover: #7ec8ff;
  --primary-press: #3a9eef;
  --accent: #f0b429;
  --accent-soft: rgba(240, 180, 41, 0.15);
  --success: #3dd68c;
  --danger: #ff7b8a;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.25);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --header-h: 64px;
  --max: 1120px;
  --focus: 0 0 0 3px rgba(94, 184, 255, 0.45);
  --ease: 180ms ease;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(94, 184, 255, 0.08), transparent 50%),
    radial-gradient(900px 500px at 90% 0%, rgba(240, 180, 41, 0.06), transparent 45%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--ease);
}

a:hover {
  color: var(--primary-hover);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  background: var(--primary);
  color: #041018;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(11, 16, 32, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.brand:hover {
  color: var(--text);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.site-nav a {
  color: var(--text-muted);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--ease), background var(--ease);
}

.site-nav a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.site-nav a.active {
  color: var(--primary);
  background: rgba(94, 184, 255, 0.1);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform var(--ease), opacity var(--ease);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4);
    gap: var(--space-1);
    background: rgba(11, 16, 32, 0.97);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--ease), opacity var(--ease);
  }

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

  .site-nav a {
    padding: var(--space-3) var(--space-4);
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0 var(--space-5);
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), border-color var(--ease), transform 120ms ease, box-shadow var(--ease);
  text-decoration: none;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(180deg, var(--primary-hover), var(--primary));
  color: #041018;
  box-shadow: 0 2px 12px rgba(94, 184, 255, 0.25);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(180deg, #93d4ff, var(--primary-hover));
  color: #041018;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  border-color: var(--primary);
}

.btn-small {
  min-height: 36px;
  padding: 0 var(--space-4);
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-icon {
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  background: var(--bg-elev-2);
  color: var(--text);
  border: 1px solid var(--border);
  font-size: 1rem;
}

.btn-icon:hover:not(:disabled) {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-icon[aria-pressed="true"] {
  background: rgba(94, 184, 255, 0.15);
  border-color: var(--primary);
  color: var(--primary);
}

.btn-block {
  width: 100%;
}

/* Typography helpers */
.eyebrow {
  margin: 0 0 var(--space-2);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

h1, h2, h3 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--text);
}

h1 {
  margin: 0 0 var(--space-4);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h2 {
  margin: 0 0 var(--space-3);
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
}

h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.0625rem;
}

.lede {
  margin: 0;
  max-width: 60ch;
  font-size: 1.0625rem;
  color: var(--text-muted);
}

.section-head {
  max-width: 64ch;
  margin-bottom: var(--space-5);
}

.section-head p,
.section-title + p {
  color: var(--text-muted);
}

.section-title {
  margin-bottom: var(--space-5);
}

/* Hero */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--space-7) var(--space-4) var(--space-6);
}

.hero-sim {
  display: grid;
  gap: var(--space-6);
}

.hero-copy .lede {
  margin-bottom: var(--space-5);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.hero-stats li {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  text-align: center;
}

.hero-stats strong {
  display: block;
  font-size: 1.5rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.hero-stats span {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.page-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--space-7) var(--space-4) var(--space-5);
}

/* Simulator */
.sim-section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-7);
}

.sim-shell {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-4);
  align-items: start;
}

.sim-stage {
  position: relative;
  background: #050814;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  min-height: 320px;
  aspect-ratio: 5 / 3;
}

.sim-stage canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}

.sim-stage canvas:active {
  cursor: grabbing;
}

.sim-hud {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  top: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  pointer-events: none;
}

.hud-time,
.hud-hint {
  background: rgba(5, 8, 20, 0.72);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  font-size: 0.8125rem;
  backdrop-filter: blur(6px);
}

.hud-label {
  display: block;
  color: var(--text-dim);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

#hud-date {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.hud-hint {
  color: var(--text-muted);
  align-self: flex-start;
}

.sim-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  background: rgba(5, 8, 20, 0.9);
  color: var(--text-muted);
  z-index: 5;
  transition: opacity 300ms ease;
}

.sim-loading.hidden {
  opacity: 0;
  pointer-events: none;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-strong);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.planet-panel {
  position: absolute;
  right: var(--space-3);
  bottom: var(--space-3);
  width: min(300px, calc(100% - 24px));
  background: rgba(18, 26, 48, 0.94);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  z-index: 4;
}

.planet-panel[hidden] {
  display: none;
}

.panel-close {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.panel-close:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.panel-top {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  margin-bottom: var(--space-3);
  padding-right: var(--space-6);
}

.panel-top img {
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.25);
}

.panel-type {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.panel-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  margin: 0 0 var(--space-3);
}

.panel-stats div {
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
}

.panel-stats dt {
  margin: 0;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

.panel-stats dd {
  margin: 2px 0 0;
  font-size: 0.875rem;
  font-weight: 600;
}

.panel-blurb {
  margin: 0 0 var(--space-3);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.panel-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.sim-controls {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  max-height: min(720px, calc(100vh - var(--header-h) - 48px));
  overflow: auto;
}

.control-block h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: var(--space-3);
}

.btn-row {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.slider-label span {
  color: var(--accent);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid #041018;
  box-shadow: 0 0 0 2px rgba(94, 184, 255, 0.35);
  cursor: grab;
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid #041018;
  cursor: grab;
}

.check-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
  cursor: pointer;
}

.check-label input {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
}

.control-note {
  margin: var(--space-2) 0 0;
  font-size: 0.75rem;
  color: var(--text-dim);
  line-height: 1.4;
}

select {
  width: 100%;
  min-height: 44px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elev-2);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9375rem;
  cursor: pointer;
}

.planet-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.planet-legend button {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: 6px 8px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.8125rem;
  text-align: left;
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}

.planet-legend button:hover,
.planet-legend button.active {
  background: rgba(94, 184, 255, 0.08);
  border-color: var(--border);
  color: var(--text);
}

.legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.15);
}

@media (max-width: 960px) {
  .sim-shell {
    grid-template-columns: 1fr;
  }

  .sim-controls {
    max-height: none;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .legend-block {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .sim-controls {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .sim-stage {
    aspect-ratio: 4 / 3;
  }
}

/* Features */
.features-strip {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-7);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.feature-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.feature-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.feature-card img {
  border-radius: var(--radius);
  max-height: 140px;
  object-fit: contain;
  margin-bottom: var(--space-1);
}

.feature-card p {
  margin: 0;
  flex: 1;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.feature-card a {
  font-weight: 600;
  font-size: 0.9375rem;
}

@media (max-width: 800px) {
  .features-strip {
    grid-template-columns: 1fr;
  }
}

/* CTA */
.cta-band {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(94, 184, 255, 0.05), transparent);
  padding: var(--space-7) var(--space-4);
  margin-bottom: var(--space-2);
}

.cta-band.compact {
  padding: var(--space-6) var(--space-4);
}

.cta-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-5);
}

.cta-inner > div {
  flex: 1 1 240px;
}

.cta-inner p {
  margin: var(--space-2) 0 0;
  color: var(--text-muted);
}

/* Footer */
.site-footer {
  padding: var(--space-7) var(--space-4) var(--space-6);
  margin-top: var(--space-4);
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: var(--space-5);
}

.footer-brand {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}

.footer-brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.footer-brand p {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 0.875rem;
  max-width: 40ch;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
}

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-nav a:hover {
  color: var(--primary);
}

.footer-note {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-dim);
  max-width: 70ch;
}

/* Planets page */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.chip {
  min-height: 36px;
  padding: 0 var(--space-4);
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), border-color var(--ease);
}

.chip:hover {
  border-color: var(--border-strong);
  color: var(--text);
}

.chip.active {
  background: rgba(94, 184, 255, 0.15);
  border-color: var(--primary);
  color: var(--primary);
}

.planet-grid-section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-7);
}

.planet-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.planet-card {
  display: flex;
  gap: var(--space-4);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color var(--ease), box-shadow var(--ease);
}

.planet-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.planet-card img {
  width: 88px;
  height: 88px;
  object-fit: contain;
  flex-shrink: 0;
}

.planet-card .tag {
  margin: 0 0 var(--space-2);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 600;
}

.planet-card p {
  margin: 0 0 var(--space-3);
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.mini-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.mini-stats li {
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
}

.mini-stats span {
  display: block;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

.mini-stats strong {
  font-size: 0.8125rem;
  font-weight: 600;
}

.empty-filter {
  text-align: center;
  color: var(--text-muted);
  padding: var(--space-7);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

@media (max-width: 800px) {
  .planet-grid {
    grid-template-columns: 1fr;
  }

  .planet-card {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Content sections */
.content-section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-7);
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.info-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.info-card img {
  margin-bottom: var(--space-3);
}

.info-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.info-card em {
  color: var(--accent);
  font-style: normal;
  font-weight: 600;
}

@media (max-width: 800px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
}

.demo-section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-7);
}

.demo-section.alt {
  padding-top: var(--space-2);
}

.demo-panel {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-4);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  align-items: center;
}

.demo-panel canvas {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  background: #050814;
  border: 1px solid var(--border);
}

.demo-controls label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.demo-controls strong {
  color: var(--accent);
}

.demo-readout {
  margin: var(--space-4) 0 0;
  font-size: 1rem;
}

.ecc-ref {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

@media (max-width: 800px) {
  .demo-panel {
    grid-template-columns: 1fr;
  }
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  min-width: 560px;
}

.data-table th,
.data-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  background: rgba(0, 0, 0, 0.2);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover td {
  background: rgba(94, 184, 255, 0.04);
}

/* Compare */
.compare-section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-7);
}

.compare-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.size-stage {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: center;
  gap: var(--space-3) var(--space-4);
  min-height: 200px;
  padding: var(--space-6) var(--space-4);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow-x: auto;
}

.size-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.size-circle {
  border-radius: 50%;
  box-shadow: inset -4px -4px 12px rgba(0, 0, 0, 0.35), 0 0 12px rgba(255, 255, 255, 0.08);
}

.size-item span {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.scale-caption {
  margin: var(--space-3) 0 0;
  font-size: 0.875rem;
  color: var(--text-dim);
  max-width: 70ch;
}

.pair-compare {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.pair-pickers {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.pair-pickers label {
  flex: 1 1 140px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.pair-visual {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: var(--space-6);
  min-height: 160px;
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius);
}

.pair-ball-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.pair-ball {
  border-radius: 50%;
  box-shadow: inset -6px -6px 16px rgba(0, 0, 0, 0.4);
}

.pair-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.pair-stat {
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

.pair-stat span {
  display: block;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.pair-stat strong {
  font-size: 0.9375rem;
}

@media (max-width: 600px) {
  .pair-stats {
    grid-template-columns: 1fr;
  }
}

.au-track-wrap {
  overflow-x: auto;
  padding-bottom: var(--space-2);
}

.au-track {
  position: relative;
  min-width: 720px;
  height: 140px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin: 0;
}

.au-line {
  position: absolute;
  left: 24px;
  right: 24px;
  top: 50%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  opacity: 0.5;
}

.au-body {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.au-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  box-shadow: 0 0 10px currentColor;
}

.au-body span {
  font-size: 0.6875rem;
  color: var(--text-muted);
  white-space: nowrap;
  position: absolute;
  top: 18px;
}

.au-body:nth-child(odd) span {
  top: auto;
  bottom: 18px;
}

.stat-cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
}

.stat-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
}

.stat-card img {
  width: 48px;
  height: 48px;
  object-fit: contain;
  margin-bottom: var(--space-3);
}

.stat-card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

@media (max-width: 900px) {
  .stat-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .stat-cards {
    grid-template-columns: 1fr;
  }
}

/* About */
.about-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-6);
  align-items: start;
}

.about-prose h2 {
  margin-top: var(--space-6);
}

.about-prose h2:first-child {
  margin-top: 0;
}

.about-prose p {
  color: var(--text-muted);
  max-width: 65ch;
}

.check-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--text-muted);
}

.check-list li {
  margin-bottom: var(--space-2);
}

.check-list.muted {
  color: var(--text-dim);
}

.about-aside {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: sticky;
  top: calc(var(--header-h) + var(--space-4));
}

.aside-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.aside-card img {
  margin-bottom: var(--space-3);
  border-radius: var(--radius);
}

.aside-card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: var(--space-3);
}

.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: var(--space-3);
  align-items: start;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
}

.steps li::before {
  content: counter(step);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(94, 184, 255, 0.12);
  color: var(--primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.steps strong {
  display: block;
  margin-bottom: 4px;
}

.steps span {
  color: var(--text-muted);
  font-size: 0.9375rem;
}

@media (max-width: 860px) {
  .about-layout {
    grid-template-columns: 1fr;
  }

  .about-aside {
    position: static;
  }
}

/* Contact */
.contact-section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-7);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-6);
  align-items: start;
}

.contact-form {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-row label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
}

.form-row input,
.form-row textarea,
.form-row select {
  min-height: 44px;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elev-2);
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--ease);
}

.form-row textarea {
  min-height: 140px;
  resize: vertical;
  line-height: 1.5;
}

.form-row input:hover,
.form-row textarea:hover,
.form-row select:hover {
  border-color: var(--border-strong);
}

.form-row input:focus,
.form-row textarea:focus,
.form-row select:focus {
  border-color: var(--primary);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.form-status {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.form-status.ok {
  color: var(--success);
}

.form-status.err {
  color: var(--danger);
}

.contact-aside {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.contact-aside img {
  margin: 0 auto var(--space-4);
  max-width: 200px;
}

.contact-aside ul {
  margin: 0 0 var(--space-4);
  padding-left: 1.2rem;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.contact-aside li {
  margin-bottom: var(--space-2);
}

@media (max-width: 800px) {
  .contact-layout {
    grid-template-columns: 1fr;
  }
}