:root {
  --bg: #14161a;
  --surface: #1c1f25;
  --surface-hi: #242830;
  --border: #2e333d;
  --text: #e8eaee;
  --text-dim: #9aa1ad;
  --accent: #e5675c;
  --accent-soft: rgba(229, 103, 92, 0.14);
  --radius: 14px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

body[data-mode="short"] {
  --accent: #4f9dd8;
  --accent-soft: rgba(79, 157, 216, 0.14);
}

body[data-mode="long"] {
  --accent: #5aab84;
  --accent-soft: rgba(90, 171, 132, 0.14);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
  background: var(--bg);
  color: var(--text);
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans KR", Roboto, sans-serif;
  transition: background 0.4s var(--ease);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(60% 50% at 50% 0%, var(--accent-soft), transparent 70%);
  transition: background 0.4s var(--ease);
}

.app {
  position: relative;
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

/* ---------- header ---------- */

.app__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.icon-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ---------- mode tabs ---------- */

.modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  padding: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.modes__tab {
  padding: 10px 6px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--text-dim);
  font: inherit;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

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

.modes__tab[aria-selected="true"] {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

/* ---------- dial ---------- */

.dial {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  max-width: 320px;
  margin: 0 auto;
}

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

.dial__track,
.dial__progress {
  fill: none;
  stroke-width: 10;
}

.dial__track {
  stroke: var(--surface-hi);
}

.dial__progress {
  stroke: var(--accent);
  stroke-linecap: round;
  transition: stroke 0.4s var(--ease);
}

.dial__readout {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.dial__time {
  font-size: clamp(3.5rem, 18vw, 4.75rem);
  font-weight: 300;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1;
}

.dial__phase {
  font-size: 0.875rem;
  color: var(--text-dim);
}

/* ---------- controls ---------- */

.controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.btn {
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font: inherit;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background 0.2s var(--ease), transform 0.1s var(--ease);
}

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

.btn--ghost {
  padding: 11px 18px;
  font-size: 0.875rem;
}

.btn--ghost:hover {
  color: var(--text);
  border-color: var(--accent);
}

.btn--primary {
  min-width: 150px;
  padding: 15px 28px;
  border-color: transparent;
  background: var(--accent);
  color: #14161a;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.btn--small {
  padding: 8px 14px;
  font-size: 0.8125rem;
}

/* ---------- progress dots ---------- */

.progressbar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.progressbar__dots {
  display: flex;
  gap: 7px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--surface-hi);
  transition: background 0.3s var(--ease);
}

.dot--done {
  background: var(--accent);
}

.progressbar__label {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.progressbar__label strong {
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ---------- settings ---------- */

.settings {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.settings[hidden] {
  display: none;
}

.settings__title {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
}

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

.settings__group:last-child {
  flex-direction: row;
  gap: 8px;
}

.settings__subtitle {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-dim);
}

.settings__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.9375rem;
}

.settings__row input {
  width: 84px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.settings__row input:focus,
.settings__check input:focus-visible,
.btn:focus-visible,
.icon-btn:focus-visible,
.modes__tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.settings__row input:invalid {
  border-color: #d9534f;
}

.settings__hint {
  margin: 0;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.settings__check {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9375rem;
  cursor: pointer;
}

.settings__check input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.hint {
  margin: 0;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-dim);
}

@media (max-width: 380px) {
  .btn--primary {
    min-width: 120px;
    padding: 14px 20px;
  }

  .btn--ghost {
    padding: 11px 13px;
  }
}

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