:root {
  color-scheme: dark;
  --bg: #09101d;
  --bg-soft: #101b30;
  --panel: rgba(14, 23, 40, 0.88);
  --panel-strong: rgba(11, 18, 34, 0.96);
  --line: rgba(171, 192, 255, 0.14);
  --text: #eff3ff;
  --muted: #adc0ef;
  --accent: #8f7cff;
  --accent-2: #58d4ff;
  --accent-3: #ff9ed9;
  --success: #6ce6b6;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.34);
  font-family: 'Inter', system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: inherit;
  background:
    radial-gradient(circle at top left, rgba(143, 124, 255, 0.24), transparent 34%),
    radial-gradient(circle at top right, rgba(88, 212, 255, 0.18), transparent 26%),
    linear-gradient(180deg, #09101d 0%, #070b13 100%);
  color: var(--text);
}

a { color: inherit; }
main { padding-bottom: 2rem; }
.shell { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; }
.hero { padding: 4.5rem 0 2rem; }
.hero-grid, .app-layout, .three-up, .faq-grid, .footer-grid, .panel-grid, .metric-grid {
  display: grid;
  gap: 1rem;
}
.hero-grid { grid-template-columns: 1.3fr .9fr; align-items: stretch; }
.three-up { grid-template-columns: repeat(3, 1fr); }
.app-layout { grid-template-columns: 1.05fr .95fr; align-items: start; }
.faq-grid { grid-template-columns: repeat(2, 1fr); }
.footer-grid { grid-template-columns: 1fr auto; align-items: center; }
.panel-grid { grid-template-columns: repeat(2, 1fr); }
.panel-grid.three-col { grid-template-columns: repeat(3, 1fr); }
.metric-grid { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 1.25rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}
.hero-card, .results-card, .builder-card { padding: 1.4rem; }
.section { padding: 1rem 0; }
.muted { opacity: 0.98; }
.eyebrow, .mini-label {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .16em;
  color: var(--accent-2);
}
.mini-label { margin-bottom: .8rem; }
.lead, .small-note, p, li { color: var(--muted); line-height: 1.6; }
h1, h2, h3, strong { color: var(--text); margin-top: 0; }
h1 { font-size: clamp(2.2rem, 5vw, 4rem); line-height: 1.02; margin: .6rem 0 1rem; max-width: 12ch; }
h2 { font-size: 1.25rem; margin-bottom: .45rem; }
h3 { font-size: 1rem; margin-bottom: .35rem; }
.no-top { margin-top: 0; }
.compact { padding-left: 1rem; margin: 1rem 0 0; }
.bullet-list li + li { margin-top: .55rem; }
.cta-row, .toolbar, .subpanel-head { display: flex; gap: .75rem; flex-wrap: wrap; align-items: center; }
.cta-row { margin: 1.3rem 0 1rem; }
.subpanel-head { justify-content: space-between; }
.align-start { align-items: start; }

.btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: .88rem 1.2rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: transform .18s ease, opacity .18s ease, background .18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #06101e; }
.btn-secondary { background: rgba(255,255,255,.08); color: var(--text); border: 1px solid rgba(255,255,255,.09); }
.btn-ghost { background: transparent; color: var(--muted); border: 1px dashed rgba(255,255,255,.15); }
.btn.small { padding: .55rem .9rem; font-size: .9rem; }

label {
  display: block;
  font-weight: 600;
  margin-bottom: .45rem;
  color: var(--text);
}
input, select, textarea {
  width: 100%;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.1);
  background: rgba(3, 7, 15, 0.45);
  color: var(--text);
  padding: .88rem 1rem;
  font: inherit;
}
textarea { resize: vertical; min-height: 15rem; }
.form-stack { display: grid; gap: 1rem; }
.section-heading.tight h2 { margin-bottom: .2rem; }

.metric-card, .status-card, .subpanel, .feature-card {
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 22px;
}
.metric-card {
  padding: .95rem 1rem;
  min-height: 5.2rem;
}
.metric-card span {
  display: block;
  color: var(--muted);
  font-size: .88rem;
  margin-bottom: .35rem;
}
.metric-card strong { font-size: 1.1rem; }
.metric-card.accent strong { color: var(--accent-2); }
.status-card {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 1rem;
  padding: 1rem;
  margin-top: 1rem;
}
.status-pill {
  display: inline-flex;
  border-radius: 999px;
  background: rgba(108, 230, 182, .13);
  color: var(--success);
  padding: .2rem .65rem;
  margin-bottom: .45rem;
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.muted-pill { background: rgba(143,124,255,.15); color: #c8bcff; }
.subpanel { padding: 1rem; margin-top: 1rem; }
.warning-panel { border-color: rgba(255, 158, 217, .15); }
.line-list { margin: 0; padding-left: 1rem; }
.line-list li + li { margin-top: .45rem; }
.chord-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: .75rem;
}
.chord-card {
  border-radius: 18px;
  padding: .9rem;
  border: 1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.03);
}
.chord-card strong { display: block; font-size: 1.15rem; }
.chord-card span { color: var(--muted); font-size: .85rem; }
.summary-stack {
  display: grid;
  gap: .75rem;
}
.summary-card {
  padding: .8rem .9rem;
  border-radius: 18px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
}
.site-footer {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 1.35rem 0 2.4rem;
}
.site-footer nav { display: flex; gap: 1rem; flex-wrap: wrap; }
.footer-entity { text-align: right; }
.doc-body { min-height: 100vh; }
.doc-shell {
  max-width: 780px;
  padding: 3rem 0 1.6rem;
}
.doc-shell ol, .doc-shell ul { color: var(--muted); line-height: 1.7; }
.doc-footer { padding-top: 0; }

@media (max-width: 900px) {
  .hero-grid, .app-layout, .three-up, .faq-grid, .footer-grid, .panel-grid, .panel-grid.three-col, .metric-grid, .status-card {
    grid-template-columns: 1fr;
  }
  h1 { max-width: 100%; }
  .footer-entity { text-align: left; }
}