:root {
  --bg: #07111a;
  --panel: rgba(10, 20, 31, 0.9);
  --panel-2: rgba(16, 28, 43, 0.94);
  --line: rgba(122, 173, 255, 0.2);
  --text: #e8f1ff;
  --muted: #93a8c8;
  --cyan: #47d8ff;
  --violet: #b86dff;
  --gold: #f5b23c;
  --green: #56f0b8;
  --red: #ff6262;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; background: radial-gradient(circle at top left, rgba(71, 216, 255, 0.16), transparent 28%), radial-gradient(circle at top right, rgba(184, 109, 255, 0.18), transparent 30%), linear-gradient(180deg, #03080d 0%, #08111b 100%); color: var(--text); }
.page-shell { max-width: 1520px; margin: 0 auto; padding: 28px; }
.site-nav-bar { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 18px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,0.04); box-shadow: 0 10px 30px rgba(0,0,0,0.22); }
.site-nav-bar a { color: var(--muted); text-decoration: none; padding: 9px 12px; border-radius: 10px; border: 1px solid transparent; transition: all 0.18s ease; }
.site-nav-bar a:hover { color: var(--text); border-color: rgba(255,255,255,0.08); background: rgba(255,255,255,0.05); }
.site-nav-bar a.is-active { color: var(--text); background: rgba(71,216,255,0.14); border-color: rgba(71,216,255,0.35); }
.hero { display: grid; grid-template-columns: 1.8fr 1fr; gap: 20px; align-items: stretch; margin-bottom: 18px; }
.eyebrow { margin: 0 0 10px; text-transform: uppercase; letter-spacing: 0.16em; color: var(--cyan); font-size: 0.78rem; }
.hero h1 { margin: 0 0 12px; font-size: clamp(2rem, 3vw, 3.4rem); line-height: 1.05; }
.hero-copy { margin: 0; color: var(--muted); max-width: 900px; font-size: 1rem; line-height: 1.6; }
.hero-card, .panel { border: 1px solid var(--line); border-radius: 22px; background: linear-gradient(180deg, var(--panel-2) 0%, var(--panel) 100%); box-shadow: 0 18px 50px rgba(0, 0, 0, 0.32); }
.hero-card { padding: 18px; display: grid; gap: 14px; }
.hero-metric { padding: 14px; border-radius: 16px; background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(255, 255, 255, 0.05); }
.hero-metric span { display: block; color: var(--muted); font-size: 0.85rem; margin-bottom: 8px; }
.hero-metric strong { font-size: 1.25rem; }
.toolbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.tab-strip, .preset-strip { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.tab-button, .preset-button, .action-button, .mini-button { border: 1px solid rgba(255,255,255,0.08); color: var(--text); background: rgba(255,255,255,0.04); border-radius: 12px; cursor: pointer; }
.tab-button { padding: 10px 14px; }
.tab-button.is-active { background: rgba(71,216,255,0.14); border-color: rgba(71,216,255,0.35); }
.preset-strip span { color: var(--muted); font-size: 0.85rem; }
.preset-button { padding: 9px 12px; }
.action-button { padding: 10px 14px; }
.mini-button { padding: 6px 10px; font-size: 0.82rem; }
.head-actions { display: flex; gap: 10px; align-items: center; }
.tab-panel { display: none; }
.tab-panel.is-active { display: block; }
.grid, .builder-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; }
.panel { padding: 18px; }
.controls-panel { grid-column: span 3; }
.scene-panel { grid-column: span 9; }
.plot-panel { grid-column: span 4; }
.sweep-panel { grid-column: span 12; }
.insights-panel { grid-column: span 12; }
.builder-controls-panel { grid-column: span 3; }
.builder-preview-panel { grid-column: span 9; }
.panel h2 { margin: 0 0 16px; font-size: 1.05rem; }
.panel-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 12px; }
.panel-head span { color: var(--muted); font-size: 0.84rem; }
.control-group { margin-bottom: 16px; }
.control-group label { display: block; margin-bottom: 8px; color: var(--muted); font-size: 0.9rem; }
.control-group input[type="range"], .control-group input[type="text"], .control-group input[type="number"], .control-group select { width: 100%; accent-color: var(--cyan); }
.control-group input[type="text"], .control-group input[type="number"], .control-group select { padding: 10px 12px; border-radius: 12px; border: 1px solid rgba(255,255,255,0.08); background: rgba(255,255,255,0.04); color: var(--text); }
.checkbox-group label { display: block; margin-bottom: 8px; }
.control-value { margin-top: 6px; color: var(--text); font-family: Consolas, monospace; }
.equation-box, .table-wrap { margin-top: 18px; padding: 14px; border-radius: 14px; background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(255, 255, 255, 0.06); }
.equation-box code { display: block; margin-bottom: 8px; color: #d9e8ff; }
.export-stack { display: grid; gap: 10px; margin-top: 16px; }
canvas { width: 100%; border-radius: 16px; background: linear-gradient(180deg, rgba(4, 10, 17, 0.8), rgba(7, 12, 19, 0.96)); border: 1px solid rgba(255, 255, 255, 0.05); }
.sweep-controls { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 14px; }
.sweep-button-wrap { display: flex; align-items: end; }
.table-wrap { margin-top: 0; overflow-x: auto; }
.table-wrap table { width: 100%; border-collapse: collapse; }
.table-wrap th, .table-wrap td { text-align: left; padding: 10px; border-bottom: 1px solid rgba(255,255,255,0.08); font-family: Consolas, monospace; font-size: 0.88rem; }
.insight-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.insight-grid article { padding: 16px; border-radius: 16px; background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(255, 255, 255, 0.05); }
.insight-grid h3 { margin: 0 0 10px; font-size: 0.92rem; }
.insight-grid p { margin: 0; color: var(--muted); line-height: 1.55; }
@media (max-width: 1100px) { .hero, .grid, .builder-grid { grid-template-columns: 1fr; } .controls-panel, .scene-panel, .plot-panel, .sweep-panel, .insights-panel, .builder-controls-panel, .builder-preview-panel { grid-column: span 12; } .insight-grid { grid-template-columns: 1fr 1fr; } .sweep-controls { grid-template-columns: 1fr 1fr; } }
@media (max-width: 720px) { .page-shell { padding: 16px; } .site-nav-bar { gap: 8px; padding: 12px; } .site-nav-bar a { width: 100%; text-align: center; } .insight-grid, .sweep-controls { grid-template-columns: 1fr; } }

.hero-link-row { margin: 14px 0 0; color: var(--muted); }
.hero-link-row a { color: var(--gold); text-decoration: none; }
.hero-link-row a:hover { color: var(--text); }