*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f5f0ea;
  --surface: #fdfaf7;
  --border: #d8cfc6;
  --text: #2c2420;
  --text-muted: #7a6f6a;
  --accent: #8b4513;
  --accent-hover: #6d350f;
  --radius: 6px;
  --gap: 1.25rem;
}

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1rem 6rem;
}

/* ── Header ── */
header {
  width: 100%;
  max-width: 560px;
  margin-bottom: 2rem;
  text-align: center;
}

header .wordmark {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

header p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ── Form card ── */
.card {
  width: 100%;
  max-width: 560px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: var(--gap);
}

.field:last-child {
  margin-bottom: 0;
}

label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}

input[type="text"],
input[type="email"],
select,
textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  color: var(--text);
  font-family: inherit;
  transition: border-color 0.15s;
  appearance: none;
}

input[type="text"]:focus,
input[type="email"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237a6f6a' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

textarea {
  resize: vertical;
  min-height: 7rem;
  line-height: 1.5;
}

/* ── Slider ── */
.slider-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

input[type="range"] {
  flex: 1;
  appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--surface);
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

input[type="range"]:focus {
  outline: none;
}

.slider-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  min-width: 5rem;
  text-align: right;
}

/* ── Checkboxes ── */
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text);
  cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

/* ── Submit ── */
.submit-btn {
  width: 100%;
  padding: 0.75rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: background 0.15s;
  margin-top: 0.5rem;
}

.submit-btn:hover {
  background: var(--accent-hover);
}

/* ── Divider ── */
.divider {
  height: 1px;
  background: var(--border);
  margin: var(--gap) 0;
}

/* ── Felt canvas overlay ── */
#felt-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s;
}

#felt-canvas.visible {
  opacity: 1;
}

/* ── Controls bar ── */
#controls {
  position: fixed;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(44, 36, 32, 0.88);
  backdrop-filter: blur(8px);
  border-radius: 999px;
  padding: 0.5rem 1rem;
  color: #fff;
  font-size: 0.8rem;
  user-select: none;
}

#toggle-btn {
  background: none;
  border: 1px solid rgba(255,255,255,0.35);
  color: #fff;
  border-radius: 999px;
  padding: 0.25rem 0.875rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

#toggle-btn:hover {
  background: rgba(255,255,255,0.15);
}

#status {
  color: rgba(255,255,255,0.6);
}

#fps {
  color: #c8f59a;
  font-weight: 600;
  min-width: 4.5rem;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #555;
  transition: background 0.3s;
}

.dot.running {
  background: #6cf078;
  box-shadow: 0 0 6px #6cf07888;
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}