/* ===== Pomodoro Flow — Dark Theme ===== */

:root {
  --bg: #1a1a2e;
  --bg-surface: #16213e;
  --text: #e0e0e0;
  --text-muted: #8892a4;
  --accent: #e74c3c;
  --accent-glow: rgba(231, 76, 60, 0.3);
  --break-accent: #27ae60;
  --break-glow: rgba(39, 174, 96, 0.3);
  --long-accent: #2980b9;
  --long-glow: rgba(41, 128, 185, 0.3);
  --ring-bg: rgba(255, 255, 255, 0.06);
  --radius: 12px;
  --transition: 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
  overflow: hidden;
}

/* Mode-based color shifts */
body.mode-work { --current-accent: var(--accent); --current-glow: var(--accent-glow); }
body.mode-shortBreak { --current-accent: var(--break-accent); --current-glow: var(--break-glow); background: #0f2419; }
body.mode-longBreak { --current-accent: var(--long-accent); --current-glow: var(--long-glow); background: #0f1926; }

/* ===== Layout ===== */

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 24px;
  width: 100%;
  max-width: 480px;
}

/* ===== Header ===== */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo span { color: var(--current-accent, var(--accent)); }

.btn-icon {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: all var(--transition);
}

.btn-icon:hover { color: var(--text); background: rgba(255,255,255,0.06); }

/* ===== Mode Selector ===== */

.mode-selector {
  display: flex;
  gap: 8px;
  background: var(--bg-surface);
  padding: 4px;
  border-radius: 10px;
}

.mode-btn {
  padding: 8px 18px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition);
}

.mode-btn:hover { color: var(--text); }

.mode-btn.active {
  background: var(--current-accent, var(--accent));
  color: #fff;
  box-shadow: 0 2px 12px var(--current-glow, var(--accent-glow));
}

/* ===== Timer Ring ===== */

.timer-wrapper {
  position: relative;
  width: 300px;
  height: 300px;
}

.timer-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: var(--ring-bg);
  stroke-width: 6;
}

.ring-progress {
  fill: none;
  stroke: var(--current-accent, var(--accent));
  stroke-width: 6;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.5s linear, stroke var(--transition);
  filter: drop-shadow(0 0 8px var(--current-glow, var(--accent-glow)));
}

.timer-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

#time-display {
  font-size: 4rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  line-height: 1;
}

#mode-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 4px;
}

#session-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 8px;
  opacity: 0.7;
}

/* ===== Controls ===== */

.controls {
  display: flex;
  gap: 16px;
  align-items: center;
}

.btn-control {
  border: none;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-control:hover { background: rgba(255,255,255,0.12); }

.btn-control.primary {
  width: 64px;
  height: 64px;
  font-size: 1.5rem;
  background: var(--current-accent, var(--accent));
  color: #fff;
  box-shadow: 0 4px 20px var(--current-glow, var(--accent-glow));
}

.btn-control.primary:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 28px var(--current-glow, var(--accent-glow));
}

/* ===== Shortcuts hint ===== */

.shortcuts {
  font-size: 0.7rem;
  color: var(--text-muted);
  opacity: 0.5;
  text-align: center;
}

.shortcuts kbd {
  display: inline-block;
  padding: 1px 5px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 4px;
  font-family: inherit;
  font-size: 0.7rem;
  margin: 0 2px;
}

/* ===== Settings Panel ===== */

.settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 90;
}

.settings-overlay.open { opacity: 1; visibility: visible; }

.settings-panel {
  position: fixed;
  top: 0;
  right: -380px;
  width: 360px;
  max-width: 90vw;
  height: 100vh;
  background: var(--bg-surface);
  padding: 32px 24px;
  overflow-y: auto;
  transition: right var(--transition);
  z-index: 100;
  box-shadow: -4px 0 24px rgba(0,0,0,0.3);
}

.settings-panel.open { right: 0; }

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
}

.settings-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
}

.setting-group {
  margin-bottom: 24px;
}

.setting-group label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.setting-group input[type="number"],
.setting-group select {
  width: 100%;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
  transition: border var(--transition);
}

.setting-group input[type="number"]:focus,
.setting-group select:focus {
  border-color: var(--current-accent, var(--accent));
}

.setting-group select option {
  background: var(--bg-surface);
  color: var(--text);
}

/* Volume slider */

.volume-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.volume-row input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: rgba(255,255,255,0.15);
  border-radius: 2px;
  outline: none;
}

.volume-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--current-accent, var(--accent));
  cursor: pointer;
}

.volume-row input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--current-accent, var(--accent));
  border: none;
  cursor: pointer;
}

#volume-value {
  font-size: 0.85rem;
  min-width: 36px;
  text-align: right;
}

/* Checkbox */

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

.checkbox-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--current-accent, var(--accent));
}

.checkbox-row span {
  font-size: 0.9rem;
}

/* ===== Responsive ===== */

@media (max-width: 480px) {
  .timer-wrapper { width: 260px; height: 260px; }
  #time-display { font-size: 3.2rem; }
  .mode-btn { padding: 6px 12px; font-size: 0.78rem; }
  .settings-panel { width: 100vw; right: -100vw; }
  .shortcuts { display: none; }
}

@media (max-width: 360px) {
  .timer-wrapper { width: 220px; height: 220px; }
  #time-display { font-size: 2.6rem; }
}