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

:root {
  --bg: #0f0f1a;
  --card: #1a1a2e;
  --text: #e8ecf1;
  --muted: #7a8ba5;
  --accent: #38bdf8;
  --accent2: #818cf8;
  --green: #22c55e;
  --red: #ef4444;
  --border: #1e2d4a;
}

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

.app {
  max-width: 500px;
  width: 100%;
  padding: 2rem 1rem;
  text-align: center;
}

header h1 {
  font-size: 2rem;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle { color: var(--muted); margin: 0.3rem 0 1.5rem; font-size: 0.9rem; }

/* Presets */
.presets {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.preset {
  padding: 0.5rem 1rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.preset:hover { border-color: var(--accent); color: var(--text); }
.preset.active { border-color: var(--accent); background: rgba(56,189,248,0.1); color: var(--accent); }

/* Timer Display */
.timer-container {
  position: relative;
  width: 260px;
  height: 260px;
  margin: 0 auto 1.5rem;
}

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

.ring-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 8;
}

.ring-fg {
  fill: none;
  stroke: var(--accent);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 754;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.5s linear, stroke 0.3s;
}

.ring-fg.warning { stroke: #f97316; }
.ring-fg.danger { stroke: var(--red); }
.ring-fg.done { stroke: var(--green); }

.timer-display {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#timer-text {
  font-size: 3.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 2px;
}

.timer-label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Custom Input */
.custom-input { margin-bottom: 1.5rem; }

.time-inputs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
}

.input-group { text-align: center; }

.input-group input {
  width: 60px;
  padding: 0.5rem;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--text);
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  outline: none;
  transition: border-color 0.2s;
  -moz-appearance: textfield;
}

.input-group input::-webkit-inner-spin-button,
.input-group input::-webkit-outer-spin-button { -webkit-appearance: none; }

.input-group input:focus { border-color: var(--accent); }

.input-group label {
  display: block;
  font-size: 0.65rem;
  color: var(--muted);
  margin-top: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.colon { font-size: 1.8rem; font-weight: 700; color: var(--muted); padding: 0 0.2rem; }

/* Controls */
.controls {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.ctrl-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.ctrl-btn:hover { transform: scale(1.1); }

.ctrl-btn.start {
  background: linear-gradient(135deg, var(--green), #16a34a);
  border-color: var(--green);
  color: #fff;
  width: 64px;
  height: 64px;
  font-size: 1.5rem;
}

.ctrl-btn.pause {
  background: linear-gradient(135deg, #f97316, #ea580c);
  border-color: #f97316;
  color: #fff;
}

.ctrl-btn.reset {
  border-color: var(--red);
  color: var(--red);
}

.ctrl-btn.reset:hover { background: rgba(239,68,68,0.1); }

/* Alarm Select */
.alarm-select {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.alarm-select select {
  padding: 0.4rem 0.8rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
}

/* Fullscreen Overlay */
.fullscreen-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.95);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.fs-timer {
  font-size: 8rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: pulse 1s ease infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.fs-label {
  font-size: 1.5rem;
  color: var(--muted);
  margin-top: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.fs-close-btn {
  margin-top: 2rem;
  padding: 0.8rem 2rem;
  background: var(--card);
  color: var(--text);
  border: 2px solid var(--border);
  border-radius: 12px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
}

.fs-close-btn:hover { border-color: var(--accent); }

footer {
  margin-top: auto;
  padding: 1.5rem;
  color: #444;
  font-size: 0.8rem;
}

footer a { color: var(--accent); text-decoration: none; }

.hidden { display: none !important; }

@media (max-width: 400px) {
  #timer-text { font-size: 2.5rem; }
  .timer-container { width: 200px; height: 200px; }
  .fs-timer { font-size: 4rem; }
}