/* =============================================
   Sleep Cycle Calculator — styles.css
   Night Blue dark palette
   ============================================= */

/* ── Custom Properties ── */
:root {
  --primary: #6C5CE7;
  --primary-light: #A29BFE;
  --accent: #FDCB6E;
  --bg: #0D0A19;
  --bg2: #12103a;
  --surface: rgba(108, 92, 231, 0.08);
  --border: rgba(162, 155, 254, 0.18);
  --text: #ECECFF;
  --text-muted: #8B8AB0;
  --success: #00cec9;
  --warning: #FDCB6E;
  --danger: #e17055;
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --glow: 0 0 24px rgba(108, 92, 231, 0.4);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ── Starfield ── */
.starfield {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.star {
  position: absolute;
  border-radius: 50%;
  background: white;
  animation: twinkle var(--dur, 3s) ease-in-out infinite var(--delay, 0s);
}

@keyframes twinkle {
  0%, 100% { opacity: 0.1; transform: scale(0.8); }
  50% { opacity: var(--max-op, 0.9); transform: scale(1); }
}

/* ── Moon ── */
.moon {
  position: fixed;
  top: 40px;
  right: 60px;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #FDCB6E, #e17055);
  box-shadow: 0 0 40px rgba(253, 203, 110, 0.4), 0 0 80px rgba(253, 203, 110, 0.1);
  pointer-events: none;
  z-index: 0;
  animation: moonFloat 8s ease-in-out infinite;
}

@keyframes moonFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

/* ── Layout ── */
.container {
  position: relative;
  z-index: 1;
  max-width: 780px;
  margin: 0 auto;
  padding: 24px 16px 48px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ── Glass Card ── */
.glass {
  background: rgba(13, 10, 25, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.card {
  padding: 28px;
}

/* ── Header ── */
.header {
  text-align: center;
  padding: 32px 20px 20px;
}

.header-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 12px;
  filter: drop-shadow(0 0 16px rgba(253, 203, 110, 0.6));
  animation: moonFloat 4s ease-in-out infinite;
}

.header-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.header-subtitle {
  color: var(--text-muted);
  margin-top: 8px;
  font-size: 0.95rem;
}

/* ── Mode Toggle ── */
.mode-toggle {
  display: flex;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
  gap: 4px;
}

.mode-btn {
  flex: 1;
  padding: 12px 16px;
  border: none;
  border-radius: calc(var(--radius) - 4px);
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.mode-btn:hover {
  color: var(--text);
  background: rgba(108, 92, 231, 0.15);
}

.mode-btn.active {
  background: linear-gradient(135deg, var(--primary), #5649c0);
  color: #fff;
  box-shadow: var(--glow);
}

/* ── Form Elements ── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.time-input {
  font-family: 'Inter', monospace;
  font-size: 2.5rem;
  font-weight: 700;
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--border);
  color: var(--primary-light);
  padding: 8px 0;
  width: 100%;
  cursor: pointer;
  transition: border-color var(--transition);
  color-scheme: dark;
}

.time-input:focus {
  outline: none;
  border-bottom-color: var(--primary);
}

.select-input {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  padding: 10px 14px;
  cursor: pointer;
  transition: border-color var(--transition);
  appearance: none;
  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='%238B8AB0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.select-input:focus {
  outline: none;
  border-color: var(--primary);
}

.number-input {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  padding: 10px 14px;
  width: 100%;
  transition: border-color var(--transition);
}

.number-input:focus {
  outline: none;
  border-color: var(--primary);
}

.range-input {
  width: 100%;
  accent-color: var(--primary);
  cursor: pointer;
  height: 6px;
}

/* ── Controls Row ── */
.controls-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

/* ── Cycle Selector ── */
.cycle-selector {
  display: flex;
  gap: 6px;
}

.cycle-btn {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.cycle-btn:hover {
  border-color: var(--primary-light);
  color: var(--primary-light);
}

.cycle-btn.active {
  background: linear-gradient(135deg, var(--primary), #5649c0);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 0 12px rgba(108, 92, 231, 0.4);
}

/* ── Calc Button ── */
.calc-btn {
  width: 100%;
  margin-top: 24px;
  padding: 16px;
  border: none;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary), #5649c0);
  color: #fff;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--glow);
  position: relative;
  overflow: hidden;
}

.calc-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.calc-btn:hover::after { opacity: 1; }
.calc-btn:hover { transform: translateY(-2px); box-shadow: 0 0 36px rgba(108, 92, 231, 0.6); }
.calc-btn:active { transform: translateY(0); }

/* ── Results ── */
.results-section {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  animation: fadeSlideIn 0.4s ease-out;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.results-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.result-card {
  background: rgba(108, 92, 231, 0.1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 12px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.result-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.15), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.result-card:hover::before { opacity: 1; }
.result-card:hover { border-color: var(--primary); transform: translateY(-2px); }

.result-card.recommended {
  border-color: var(--accent);
  background: rgba(253, 203, 110, 0.08);
}

.result-card.recommended::after {
  content: '★ Best';
  position: absolute;
  top: 6px; right: 6px;
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(253, 203, 110, 0.15);
  border-radius: 4px;
  padding: 2px 5px;
  letter-spacing: 0.05em;
}

.result-card.selected {
  border-color: var(--primary);
  background: rgba(108, 92, 231, 0.2);
  box-shadow: 0 0 16px rgba(108, 92, 231, 0.3);
}

.result-time {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-light);
  font-variant-numeric: tabular-nums;
}

.result-cycles {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.result-duration {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.results-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
}

/* ── Phase Diagram ── */
.phase-card { padding: 24px; }

.section-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
}

.phase-diagram {
  width: 100%;
  overflow-x: auto;
  padding-bottom: 8px;
}

#phase-canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

.phase-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 14px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c);
  flex-shrink: 0;
}

/* ── Bottom Grid (Quality + Debt) ── */
.bottom-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

/* ── Quality Estimator ── */
.quality-inputs {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 16px;
}

.quality-result {
  text-align: center;
  padding: 16px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
}

.quality-score {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-light);
}

.quality-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ── Debt Calculator ── */
.debt-inputs {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 16px;
}

.debt-result {
  margin-top: 16px;
  text-align: center;
  padding: 16px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  animation: fadeSlideIn 0.3s ease-out;
}

.debt-result.hidden { display: none; }

.debt-amount {
  font-size: 2rem;
  font-weight: 700;
  color: var(--danger);
}

.debt-amount.ok { color: var(--success); }

.debt-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.debt-tip {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 8px;
  padding: 8px;
  background: rgba(255,255,255,0.04);
  border-radius: 8px;
}

/* ── Secondary Button ── */
.secondary-btn {
  width: 100%;
  margin-top: 12px;
  padding: 11px;
  border: 1px solid var(--primary);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--primary-light);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.secondary-btn:hover {
  background: rgba(108, 92, 231, 0.15);
  box-shadow: 0 0 12px rgba(108, 92, 231, 0.2);
}

/* ── Share / Alarm ── */
.share-card { padding: 24px; }

.share-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.share-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.selected-time-display {
  flex: 1;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary-light);
  min-width: 160px;
}

.share-buttons {
  display: flex;
  gap: 10px;
}

.share-btn {
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-family: inherit;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all var(--transition);
}

.share-btn:enabled:hover {
  border-color: var(--primary);
  background: rgba(108, 92, 231, 0.15);
}

.share-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ── Panel ── */
.panel { display: none; }
.panel.active { display: block; }

/* ── Footer ── */
.footer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding-top: 8px;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .controls-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .time-input {
    font-size: 1.8rem;
  }

  .moon {
    width: 50px;
    height: 50px;
    top: 20px;
    right: 20px;
  }

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

  .mode-toggle {
    flex-direction: column;
  }

  .results-grid {
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  }
}

@media (max-width: 400px) {
  .card { padding: 18px; }
  .header { padding: 20px 12px 12px; }
}