:root {
  color-scheme: light;
  --bg: #05060a;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-border: rgba(255, 255, 255, 0.09);
  --text: #e8ecf4;
  --muted: #9aa6bf;
  --accent: #6cf0d2;
  --accent-2: #ffb366;
  --code: #e4ff6b;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Segoe UI", "Inter", system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at 25% 20%, rgba(108, 240, 210, 0.08), transparent 40%),
              radial-gradient(circle at 80% 0%, rgba(255, 179, 102, 0.15), transparent 30%),
              var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 32px 22px 64px;
}

h1, h2 {
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
}

p { margin: 0 0 12px; }

a {
  color: var(--accent);
  text-decoration: none;
}

.site-header, .site-footer, .panel {
  max-width: 1400px;
  margin: 0 auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 8px 10px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(108, 240, 210, 0.2), rgba(255, 179, 102, 0.18));
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 18px;
  color: var(--accent);
  border: 1px solid var(--panel-border);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  color: var(--muted);
  margin: 0 0 4px;
}

.nav {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.nav-link {
  padding: 9px 14px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  color: var(--text);
  background: var(--panel);
  transition: border-color 0.2s, transform 0.2s;
}

.nav-link:hover {
  border-color: rgba(108, 240, 210, 0.6);
  transform: translateY(-1px);
}

.nav-link.active {
  border-color: rgba(108, 240, 210, 0.9);
  box-shadow: inset 0 0 0 1px rgba(108, 240, 210, 0.35);
}

.nav-link.muted {
  color: var(--muted);
  cursor: default;
}

.panel {
  display: grid;
  grid-template-columns: minmax(360px, 420px) 1fr;
  gap: 24px;
  padding: 26px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(108, 240, 210, 0.06), rgba(255, 179, 102, 0.04));
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
}

.panel-v2 {
  align-items: start;
}

.panel-copy {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.lede {
  color: #d0d8ea;
}

.formula-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 12px 14px;
  display: grid;
  gap: 8px;
}

.formula-main {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: baseline;
}

.formula-main code {
  background: rgba(255, 255, 255, 0.05);
  padding: 6px 8px;
  border-radius: 8px;
  color: var(--code);
  border: 1px solid var(--panel-border);
}

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

.formula-notes {
  display: grid;
  gap: 4px;
  color: var(--muted);
  font-size: 13px;
}

.controls {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  padding: 12px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 14px;
  border: 1px solid var(--panel-border);
}

.controls label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-weight: 600;
  color: #cfd8ec;
}

.controls label.inline {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

.controls label.checkbox {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.controls label.checkbox input {
  width: auto;
}

.controls input[type="range"] {
  accent-color: var(--accent);
}

.controls select,
.controls input[type="range"] {
  width: 100%;
}

.controls .value {
  font-size: 12px;
  color: var(--muted);
}

.button-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

button {
  cursor: pointer;
  border: 1px solid var(--panel-border);
  background: linear-gradient(145deg, rgba(108, 240, 210, 0.12), rgba(108, 240, 210, 0.05));
  color: var(--text);
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 600;
  transition: transform 0.15s, border-color 0.2s, box-shadow 0.2s;
}

button:hover {
  transform: translateY(-1px);
  border-color: rgba(108, 240, 210, 0.7);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
}

.stat {
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
}

.stat .label {
  display: block;
  font-size: 12px;
  color: var(--muted);
}

.stat .value {
  font-weight: 600;
}

.chips {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.chips button {
  background: rgba(255, 255, 255, 0.04);
  border-style: dashed;
}

.tips {
  list-style: none;
  padding: 0;
  margin: 0;
  color: var(--muted);
  display: grid;
  gap: 6px;
}

.tips kbd {
  padding: 2px 6px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.04);
  font-size: 12px;
}

.panel-canvas {
  position: relative;
  overflow: hidden;
  border-radius: 18px;
  background: #020305;
  border: 1px solid var(--panel-border);
  height: clamp(520px, 70vh, 920px);
}

.canvas-overlay {
  position: absolute;
  top: 14px;
  left: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  z-index: 2;
}

.pill {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  padding: 6px 10px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--panel-border);
  color: #dfe6ff;
  font-size: 13px;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
  background: radial-gradient(circle at 40% 40%, rgba(108, 240, 210, 0.07), transparent 45%), #010204;
}

.site-footer {
  margin-top: 28px;
  color: var(--muted);
  text-align: center;
  font-size: 14px;
}

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

  .panel-canvas {
    height: clamp(460px, 60vh, 780px);
  }
}

@media (max-width: 600px) {
  body {
    padding: 22px 16px 48px;
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .panel {
    padding: 20px;
  }
}