:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-strong: #0ea5e9;
  --danger: #f87171;
  --ring-track: #334155;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, "Hiragino Kaku Gothic ProN", sans-serif;
  display: flex;
  justify-content: center;
  padding: 24px 16px 60px;
}

main {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

h1 {
  margin: 0;
  font-size: 1.6rem;
}

.name-input {
  width: 100%;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--ring-track);
  background: var(--panel);
  color: var(--text);
  font-size: 1rem;
  text-align: center;
}

.ring-wrap {
  position: relative;
  width: 240px;
  height: 240px;
}

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

.ring-bg {
  fill: none;
  stroke: var(--ring-track);
  stroke-width: 12;
}

.ring-progress {
  fill: none;
  stroke: var(--accent);
  stroke-width: 12;
  stroke-linecap: round;
  stroke-dasharray: 565.48;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.2s linear, stroke 0.2s;
}

.display {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.1rem;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.display.warning { color: var(--danger); }

.setter {
  display: flex;
  gap: 12px;
  width: 100%;
  justify-content: center;
}

.setter-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.time-input {
  width: 100%;
  text-align: center;
  font-size: 1.6rem;
  padding: 8px 0;
  border-radius: 10px;
  border: 1px solid var(--ring-track);
  background: var(--panel);
  color: var(--text);
}

.setter-col label {
  font-size: 0.75rem;
  color: var(--muted);
  min-height: 1em;
}

.step {
  width: 100%;
  padding: 6px 0;
  border-radius: 8px;
  border: 1px solid var(--ring-track);
  background: var(--panel);
  color: var(--accent);
  font-size: 1.1rem;
  cursor: pointer;
}

.step:active { background: var(--ring-track); }

.quick-add {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.quick-add button {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--ring-track);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
}

.quick-add button.danger {
  color: var(--danger);
  border-color: var(--danger);
}

.controls {
  display: flex;
  gap: 12px;
  width: 100%;
}

.controls button {
  flex: 1;
  padding: 14px 0;
  border-radius: 12px;
  border: none;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
}

#start-btn.primary {
  background: var(--accent-strong);
  color: #05202c;
}

#start-btn.running {
  background: var(--danger);
  color: #2a0a0a;
}

#reset-btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--ring-track);
}

.presets {
  width: 100%;
}

.presets h2 {
  font-size: 1rem;
  color: var(--muted);
  margin: 0 0 10px;
}

.preset-save {
  margin-bottom: 10px;
}

.preset-save button {
  width: 100%;
  padding: 10px 0;
  border-radius: 10px;
  border: 1px dashed var(--accent);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
}

.preset-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--ring-track);
}

.preset-chip button.load {
  background: none;
  border: none;
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
}

.preset-chip button.delete {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.9rem;
  line-height: 1;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
}

.overlay.hidden {
  display: none;
}

.overlay-box {
  background: var(--panel);
  padding: 32px 24px;
  border-radius: 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#overlay-title {
  font-size: 1.4rem;
  margin: 0;
}

#overlay-close {
  padding: 10px 24px;
  border-radius: 10px;
  border: none;
  background: var(--accent-strong);
  color: #05202c;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
}