:root {
  --bg: #07111f;
  --bg-accent: #0f1d35;
  --card: rgba(12, 22, 40, 0.72);
  --card-border: rgba(255, 255, 255, 0.12);
  --text: #f4f7fb;
  --muted: #a8b3c7;
  --primary: #7c5cff;
  --primary-2: #2dd4bf;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(124, 92, 255, 0.28), transparent 28%),
    radial-gradient(circle at top right, rgba(45, 212, 191, 0.18), transparent 24%),
    linear-gradient(160deg, var(--bg), var(--bg-accent));
}

button,
input {
  font: inherit;
}

.page-shell {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.glass {
  background: var(--card);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.card {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 32px;
  align-items: flex-end;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  color: var(--primary-2);
  font-weight: 700;
}

h1,
h2 {
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.02;
  max-width: 12ch;
}

.hero-copy,
.muted {
  color: var(--muted);
}

.hero-copy {
  max-width: 58ch;
  margin: 14px 0 0;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
  gap: 24px;
}

.controls,
.preview,
.code-panel {
  padding: 24px;
}

.preview-column {
  display: grid;
  gap: 24px;
}

.section-title-row,
.label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.section-title-row.compact {
  align-items: center;
}

.control-group + .control-group {
  margin-top: 24px;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 10px;
}

.segmented {
  display: inline-flex;
  width: 100%;
  padding: 6px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.06);
  gap: 6px;
}

.segment {
  flex: 1;
  border: 0;
  border-radius: 12px;
  padding: 12px 14px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: 160ms ease;
}

.segment.active {
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.95), rgba(45, 212, 191, 0.85));
  color: #03111d;
  font-weight: 700;
}

input[type='range'] {
  width: 100%;
  accent-color: var(--primary);
}

input[type='number'] {
  width: 88px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.stops-list {
  display: grid;
  gap: 12px;
}

.stop-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
}

.stop-color {
  width: 64px;
  height: 48px;
  border: 0;
  border-radius: 14px;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.stop-position-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 84px;
  gap: 10px;
  align-items: center;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.preset-card {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 18px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease;
}

.preset-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.22);
}

.preset-swatch {
  height: 64px;
  border-radius: 14px;
  margin-bottom: 10px;
}

.preset-name {
  font-weight: 600;
}

.preview-surface {
  min-height: 360px;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

pre {
  margin: 0;
  overflow: auto;
  padding: 18px;
  border-radius: 18px;
  background: rgba(3, 10, 20, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

code {
  font-family: 'SFMono-Regular', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95rem;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

.btn {
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  cursor: pointer;
  transition: transform 160ms ease, opacity 160ms ease, background 160ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #04111d;
  font-weight: 800;
}

.btn-secondary,
.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.btn-small {
  padding: 10px 12px;
  border-radius: 12px;
}

.badge,
.status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 0.82rem;
  font-weight: 700;
}

.badge {
  background: rgba(45, 212, 191, 0.14);
  color: var(--primary-2);
}

.status-pill {
  background: rgba(255, 255, 255, 0.08);
  color: var(--muted);
}

.status-pill.success {
  background: rgba(45, 212, 191, 0.14);
  color: #7ef7e6;
}

@media (max-width: 920px) {
  .layout {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 20px, 1200px);
    padding-top: 20px;
  }

  .hero,
  .controls,
  .preview,
  .code-panel {
    padding: 18px;
  }

  .preset-grid {
    grid-template-columns: 1fr;
  }

  .stop-row,
  .stop-position-wrap {
    grid-template-columns: 1fr;
  }

  input[type='number'] {
    width: 100%;
  }
}