/* Lumina Font Lab — dark type-studio aesthetic.
   Palette: near-black stage, warm off-white ink, a soft violet->coral
   glow borrowed from the reference image, used sparingly as the single
   signature accent (the preview stage glow reacts to Weight/Roundness). */

:root {
  --bg: #0b0c10;
  --panel: #131419;
  --panel-border: #22232b;
  --ink: #f3ede7;
  --ink-dim: #9a97a3;
  --ink-faint: #605d68;
  --violet: #9b8cff;
  --coral: #ff9d84;
  --accent-grad: linear-gradient(120deg, var(--violet), var(--coral));
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 9px;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  height: 100%;
}

body {
  background-image:
    radial-gradient(circle at 15% 0%, rgba(155, 140, 255, 0.05), transparent 45%),
    radial-gradient(circle at 85% 100%, rgba(255, 157, 132, 0.04), transparent 50%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- header ---------- */

.topbar {
  padding: 22px 32px 18px;
  border-bottom: 1px solid var(--panel-border);
}

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

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 11px;
  background: var(--accent-grad);
  flex-shrink: 0;
  box-shadow: 0 0 24px rgba(155, 140, 255, 0.25);
}

.brand h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.subtitle {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--ink-dim);
  font-family: var(--mono);
  letter-spacing: 0.01em;
}

/* ---------- layout ---------- */

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  padding: 20px;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 22px;
}

/* ---------- controls ---------- */

.controls {
  display: flex;
  flex-direction: column;
  gap: 20px;
  height: fit-content;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field label {
  font-size: 12px;
  color: var(--ink-dim);
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.field input[type="text"],
.field select {
  background: #0e0f14;
  border: 1px solid var(--panel-border);
  color: var(--ink);
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: var(--sans);
  outline: none;
  transition: border-color 0.15s ease;
}

.field input[type="text"]:focus,
.field select:focus {
  border-color: var(--violet);
}

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

.slider-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 12.5px;
}

.slider-label span {
  color: var(--ink-dim);
}

.slider-label output {
  font-family: var(--mono);
  color: var(--ink);
  font-size: 12px;
  min-width: 26px;
  text-align: right;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: #23242c;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--violet);
  cursor: pointer;
  transition: transform 0.12s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--violet);
  cursor: pointer;
}

/* ---------- buttons ---------- */

.button-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn {
  flex: 1;
  min-width: 90px;
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--panel-border);
  background: #191a21;
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 550;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.08s ease, background 0.15s ease;
  font-family: var(--sans);
}

.btn:hover {
  border-color: #34353f;
  background: #1e1f27;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent-grad);
  color: #14121a;
  border: none;
  font-weight: 650;
}

.btn-primary:hover {
  filter: brightness(1.06);
  background: var(--accent-grad);
}

.btn-ghost {
  background: transparent;
}

/* ---------- preview ---------- */

.preview-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 520px;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.preview-stage {
  --glow-a: 0.22;
  --glow-spread: 60px;
  flex: 1;
  border-radius: var(--radius-md);
  background: #0e0f14;
  border: 1px solid var(--panel-border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  position: relative;
  overflow: hidden;
}

.preview-stage::before {
  content: '';
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(circle at 30% 35%, rgba(155, 140, 255, var(--glow-a)), transparent var(--glow-spread)),
    radial-gradient(circle at 72% 68%, rgba(255, 157, 132, var(--glow-a)), transparent var(--glow-spread));
  filter: blur(30px);
  pointer-events: none;
  transition: opacity 0.2s ease;
}

#svg-preview {
  width: 100%;
  height: 100%;
  max-height: 340px;
  position: relative;
  z-index: 1;
}

.glyph-fill path {
  fill: var(--ink);
  fill-rule: evenodd;
}

.preview-actions {
  display: flex;
  gap: 8px;
}

/* ---------- toast ---------- */

.toast {
  position: fixed;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: #1c1d25;
  border: 1px solid var(--panel-border);
  color: var(--ink);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-family: var(--mono);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 10;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- responsive ---------- */

@media (max-width: 880px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .preview-panel {
    min-height: 380px;
    order: -1;
  }
  .topbar {
    padding: 18px 18px 14px;
  }
  .layout {
    padding: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}