:root {
  --bg-base: #0b0f17;
  --bg-card: #131a27;
  --bg-card-elevated: #1a2333;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --text-main: #f3f6fc;
  --text-muted: #8b9bb4;
  --accent-idle: #6366f1;
  --accent-prep: #f59e0b;
  --accent-work: #10b981;
  --accent-rest: #38bdf8;
  --accent-done: #a855f7;
  --active-accent: var(--accent-idle);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', Consolas, monospace;
}

body[data-phase="idle"] {
  --active-accent: var(--accent-idle);
}
body[data-phase="prep"] {
  --active-accent: var(--accent-prep);
}
body[data-phase="work"] {
  --active-accent: var(--accent-work);
}
body[data-phase="rest"] {
  --active-accent: var(--accent-rest);
}
body[data-phase="done"] {
  --active-accent: var(--accent-done);
}

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

body {
  min-height: 100vh;
  background-color: var(--bg-base);
  background-image: radial-gradient(
    circle at 50% 0%,
    color-mix(in srgb, var(--active-accent) 18%, transparent) 0%,
    transparent 65%
  );
  color: var(--text-main);
  font-family: var(--font-sans);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px 16px;
  transition: background-image 0.4s ease;
}

.app-shell {
  width: 100%;
  max-width: 980px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Header */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px;
}

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

.brand-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--active-accent);
  box-shadow: 0 0 14px var(--active-accent);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.brand h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-tag {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
}

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

.icon-btn {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.1s;
}

.icon-btn:hover {
  background: var(--bg-card-elevated);
  border-color: rgba(255, 255, 255, 0.18);
}

.icon-btn:active {
  transform: scale(0.96);
}

.hidden {
  display: none !important;
}

/* Main Grid */
.main-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 20px;
  align-items: stretch;
}

@media (max-width: 820px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

.timer-card,
.config-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 22px;
  padding: 28px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.timer-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  position: relative;
  overflow: hidden;
}

/* Phase Header */
.phase-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.phase-badge {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--active-accent) 18%, transparent);
  color: var(--active-accent);
  border: 1px solid color-mix(in srgb, var(--active-accent) 40%, transparent);
  transition: all 0.25s ease;
}

.round-pill {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-card-elevated);
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
}

/* Circular Ring */
.ring-container {
  position: relative;
  width: 260px;
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.ring-track {
  fill: none;
  stroke: rgba(255, 255, 255, 0.06);
  stroke-width: 10;
}

.ring-fill {
  fill: none;
  stroke: var(--active-accent);
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 716.28;
  stroke-dashoffset: 0;
  transition: stroke 0.3s ease;
}

.ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
}

.time-display {
  font-family: var(--font-mono);
  font-size: 3.7rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
}

.next-up {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Stats Row */
.stats-row {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.stat-box {
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 10px 12px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* Controls */
.controls-row {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1.4fr 1fr;
  gap: 12px;
}

.ctrl-btn {
  border: none;
  border-radius: 14px;
  padding: 14px 18px;
  font-size: 0.96rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform 0.12s ease, filter 0.2s ease, background 0.2s ease;
}

.ctrl-btn:active {
  transform: scale(0.97);
}

.ctrl-btn.primary {
  background: var(--active-accent);
  color: #061019;
  font-weight: 700;
  box-shadow: 0 8px 24px color-mix(in srgb, var(--active-accent) 35%, transparent);
}

.ctrl-btn.primary:hover {
  filter: brightness(1.08);
}

.ctrl-btn.secondary {
  background: var(--bg-card-elevated);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.ctrl-btn.secondary:hover {
  background: #232f44;
}

.shortcuts-hint {
  font-size: 0.76rem;
  color: var(--text-muted);
  text-align: center;
}

kbd {
  background: var(--bg-card-elevated);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 5px;
  padding: 1px 6px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
}

/* Config Panel */
.config-card {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.section-block {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.section-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 700;
}

.presets-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.preset-btn {
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 11px 13px;
  text-align: left;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 3px;
  transition: border-color 0.2s, background 0.2s, transform 0.1s;
}

.preset-btn:hover {
  border-color: rgba(255, 255, 255, 0.22);
  background: #202b3f;
}

.preset-btn.active {
  border-color: var(--active-accent);
  background: color-mix(in srgb, var(--active-accent) 12%, var(--bg-card-elevated));
}

.preset-name {
  font-size: 0.9rem;
  font-weight: 600;
}

.preset-meta {
  font-size: 0.76rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Custom interval rows */
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 12px 14px;
  gap: 12px;
}

.setting-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.setting-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.setting-dot.prep { background: var(--accent-prep); }
.setting-dot.work { background: var(--accent-work); }
.setting-dot.rest { background: var(--accent-rest); }
.setting-dot.rounds { background: var(--accent-idle); }

.setting-name {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
}

.setting-sub {
  display: block;
  font-size: 0.74rem;
  color: var(--text-muted);
}

.stepper {
  display: flex;
  align-items: center;
  gap: 6px;
}

.step-btn {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 6px 9px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.step-btn:hover {
  background: #253248;
  border-color: rgba(255, 255, 255, 0.2);
}

.stepper input {
  width: 64px;
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 6px 8px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
}

.stepper input:focus {
  outline: none;
  border-color: var(--active-accent);
}