:root {
  --bg: #000000;
  --bg-elev: #111111;
  --bg-elev-2: #1a1a1a;
  --bg-chip: #141414;
  --line: #242424;
  --line-soft: #1b1b1b;
  --text: #fafafa;
  --text-dim: #a3a3a3;
  --text-mute: #6b6b6b;
  --ring-track: rgba(255, 255, 255, 0.08);
  --ring-progress: #fafafa;
  --warn: #fbbf24;
  --danger: #ef4444;
  --done: #10b981;
  --shadow-lg: 0 30px 60px -30px rgba(0, 0, 0, 0.9);
  --safe-top: env(safe-area-inset-top);
  --safe-bot: env(safe-area-inset-bottom);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overscroll-behavior-y: none;
  touch-action: manipulation;
}

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, select { font: inherit; color: inherit; }

/* ---- Shell ---- */
.app {
  max-width: 520px;
  margin: 0 auto;
  min-height: 100vh;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bot);
  display: flex;
  flex-direction: column;
}

/* ---- Top bar ---- */
.top-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0.9rem 1rem 0.4rem;
  gap: 0.5rem;
}
.top-title {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--text-mute);
  text-align: center;
}
.icon-btn {
  justify-self: end;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 12px;
  background: transparent;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  color: var(--text-dim);
  transition: background 0.15s, color 0.15s;
}
.icon-btn:active { background: var(--bg-elev); color: var(--text); }

/* ---- Ring ---- */
.ring-wrap {
  position: relative;
  width: min(82vw, 360px);
  margin: 2rem auto 1rem;
  aspect-ratio: 1 / 1;
  animation: breathe 4.5s ease-in-out infinite;
}
body.t-running .ring-wrap,
body.t-done .ring-wrap { animation: none; }

@keyframes breathe {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.012); }
}

.ring { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring-track, .ring-progress {
  fill: none;
  stroke-width: 8;
  stroke-linecap: round;
}
.ring-track { stroke: var(--ring-track); }
.ring-progress {
  stroke: var(--ring-progress);
  stroke-dasharray: 678.58;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.2s linear, stroke 0.3s;
}
.ring-progress.warn { stroke: var(--warn); }
.ring-progress.danger { stroke: var(--danger); }
.ring-progress.idle { stroke: var(--ring-progress); opacity: 0.28; }

.ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 1.5rem;
  pointer-events: none;
}
.ring-label {
  font-size: 0.68rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 0.5rem;
  font-weight: 600;
}
.ring-time {
  font-size: clamp(4.4rem, 22vw, 7rem);
  font-weight: 200;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  transition: color 0.25s;
  transform-origin: center;
}
.ring-time.warn { color: var(--warn); animation: pulse-warn 1s ease-in-out infinite; }
.ring-time.danger { color: var(--danger); animation: pulse-danger 0.55s ease-in-out infinite; }
.ring-time.done { color: var(--done); }

@keyframes pulse-warn {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.035); }
}
@keyframes pulse-danger {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.ring-sub {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-top: 0.6rem;
  font-weight: 500;
}

.ring-hit {
  position: absolute;
  inset: 8%;
  border-radius: 50%;
  background: transparent;
}

/* ---- Quick adjust ---- */
.quick-adjust {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  padding: 0.5rem 1rem 0;
}
.adjust-btn {
  background: var(--bg-elev);
  color: var(--text);
  padding: 0.85rem 0;
  border-radius: 14px;
  font-weight: 600;
  font-size: 0.92rem;
  transition: background 0.15s, transform 0.08s;
  font-variant-numeric: tabular-nums;
}
.adjust-btn:active { background: var(--bg-elev-2); transform: scale(0.97); }
.adjust-btn.skip { color: var(--text-dim); }

/* ---- Primary row ---- */
.primary-row {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  gap: 0.6rem;
  padding: 0.9rem 1rem 0.3rem;
}

.btn {
  padding: 1.1rem 0.8rem;
  border-radius: 18px;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.005em;
  transition: transform 0.08s, background 0.15s, opacity 0.15s, color 0.15s;
  text-align: center;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: var(--text);
  color: #000;
}
.btn-primary.running {
  background: var(--warn);
  color: #1a1200;
}
.btn-secondary {
  background: var(--bg-elev);
  color: var(--text);
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text);
}
.btn-danger {
  background: rgba(239, 68, 68, 0.12);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}
.btn.full { width: 100%; }

/* ---- Preset grid ---- */
.preset-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  padding: 1rem 1rem 1.5rem;
}
.chip {
  padding: 0.85rem 0;
  border-radius: 14px;
  background: var(--bg-elev);
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  transition: background 0.15s, color 0.15s;
}
.chip.active {
  background: var(--text);
  color: #000;
}
.chip.custom {
  background: transparent;
  border: 1px dashed var(--line);
  color: var(--text-dim);
}

/* ---- Focus mode (timer running) ---- */
body.t-running .preset-grid { display: none; }
body.t-running .ring-wrap { margin-top: 1rem; }

/* ---- Sheet ---- */
.sheet {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
}
.sheet[aria-hidden="false"] { display: block; }
.sheet-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(6px);
  animation: fade 0.18s;
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

.sheet-panel {
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  width: min(88vw, 360px);
  background: var(--bg-elev);
  padding: calc(1rem + var(--safe-top)) 1rem calc(1.25rem + var(--safe-bot));
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  box-shadow: var(--shadow-lg);
  animation: slide-in 0.2s ease-out;
  border-left: 1px solid var(--line-soft);
}
@keyframes slide-in {
  from { transform: translateX(10%); opacity: 0.6; }
  to { transform: translateX(0); opacity: 1; }
}

.sheet-head { display: flex; justify-content: space-between; align-items: center; }
.sheet-head h2 { margin: 0; font-size: 1.05rem; font-weight: 600; letter-spacing: -0.01em; }
.sheet-body { overflow-y: auto; display: flex; flex-direction: column; gap: 0.6rem; flex: 1; padding-right: 0.1rem; }

/* ---- Toggles & rows ---- */
.toggle, .row {
  background: var(--bg-elev-2);
  border-radius: 14px;
  padding: 0.9rem;
}
.toggle {
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
  cursor: pointer;
}
.toggle input {
  appearance: none;
  width: 44px;
  height: 26px;
  background: var(--line);
  border-radius: 999px;
  position: relative;
  flex-shrink: 0;
  transition: background 0.2s;
  cursor: pointer;
  margin: 0;
}
.toggle input::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: white;
  transition: transform 0.2s;
}
.toggle input:checked { background: var(--text); }
.toggle input:checked::after { transform: translateX(18px); background: #000; }
.toggle span { display: block; line-height: 1.4; }
.toggle strong { display: block; font-weight: 600; font-size: 0.92rem; }
.toggle small { display: block; color: var(--text-mute); font-size: 0.78rem; margin-top: 0.2rem; }

.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.row > span { font-weight: 500; font-size: 0.92rem; }
.row select {
  background: var(--bg-chip);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 0.5rem 0.7rem;
  border-radius: 10px;
  font-size: 0.9rem;
}

.stepper {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-chip);
  border-radius: 10px;
  padding: 0.35rem;
}
.stepper button {
  width: 2rem; height: 2rem;
  border-radius: 8px;
  background: var(--bg-elev);
  color: var(--text);
  font-weight: 700;
}
.stepper span {
  min-width: 3.2rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 0.95rem;
}

.danger-zone { margin-top: 0.8rem; }
.build-note {
  color: var(--text-mute);
  font-size: 0.75rem;
  line-height: 1.45;
  margin: 0.6rem 0 0;
  text-align: center;
}

/* ---- Rest done overlay ---- */
.done-overlay {
  position: fixed;
  inset: 0;
  z-index: 180;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  padding-top: calc(2rem + var(--safe-top));
  padding-bottom: calc(2rem + var(--safe-bot));
  background: radial-gradient(ellipse at center, #059669 0%, #022c1e 75%);
  color: white;
  border: 0;
  width: 100%;
  text-align: center;
  cursor: pointer;
  animation: done-flash 1.2s ease-in-out infinite;
}
.done-overlay[aria-hidden="false"] { display: flex; }

@keyframes done-flash {
  0%, 100% { filter: brightness(0.95); }
  50% { filter: brightness(1.15); }
}

.done-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  pointer-events: none;
}
.done-kicker {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.78);
  font-weight: 600;
}
.done-headline {
  font-size: clamp(6rem, 28vw, 11rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  line-height: 0.9;
  margin: 0.3rem 0;
  text-shadow: 0 4px 40px rgba(0, 0, 0, 0.25);
}
.done-sub {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.88);
  font-weight: 500;
}
.done-hint {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.62);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---- Screen flash ---- */
.screen-flash {
  position: fixed;
  inset: 0;
  background: var(--text);
  opacity: 0;
  pointer-events: none;
  z-index: 200;
  transition: opacity 0.15s;
}
.screen-flash.on { opacity: 0.35; }

/* ---- Toast ---- */
.toast {
  position: fixed;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  bottom: calc(1rem + var(--safe-bot));
  background: var(--bg-elev);
  color: var(--text);
  padding: 0.7rem 1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  border: 1px solid var(--line-soft);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 100;
  box-shadow: var(--shadow-lg);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---- Responsive ---- */
@media (max-height: 700px) {
  .ring-wrap { width: min(68vw, 300px); margin-top: 1rem; }
  .ring-time { font-size: clamp(3.2rem, 18vw, 5rem); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}