:root {
  --bg: #f6f5f2;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #59606a;
  --border: #d6d3cc;
  --work: #b3362f;
  --work-soft: #fbe9e7;
  --short: #1f7a4d;
  --short-soft: #e3f3ea;
  --long: #2557a7;
  --long-soft: #e4ecf8;
  --accent: var(--work);
  --accent-soft: var(--work-soft);
  --on-accent: #ffffff;
  --focus: #1a5fd0;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1d2025;
    --text: #eceef1;
    --muted: #a3aab4;
    --border: #3a3f47;
    --work: #ef8a82;
    --work-soft: #3a2220;
    --short: #6fd0a0;
    --short-soft: #1d3329;
    --long: #8fb4ee;
    --long-soft: #1f2a3d;
    --on-accent: #14161a;
    --focus: #8fb4ee;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
}

.app {
  --accent: var(--work);
  --accent-soft: var(--work-soft);
  width: 100%;
  max-width: 460px;
  margin: 0 auto;
  padding: 24px 16px 16px;
  text-align: center;
  flex: 1;
}
.app[data-phase="short"] { --accent: var(--short); --accent-soft: var(--short-soft); }
.app[data-phase="long"]  { --accent: var(--long);  --accent-soft: var(--long-soft); }

.title {
  margin: 0 0 20px;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}

.phase {
  display: inline-block;
  margin: 0;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  border: 1px solid var(--accent);
}

.time {
  margin: 16px 0 8px;
  font-size: clamp(4rem, 22vw, 6.5rem);
  font-weight: 300;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.bar {
  height: 6px;
  margin: 0 auto 16px;
  max-width: 320px;
  border-radius: 3px;
  background: var(--border);
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  width: 100%;
  background: var(--accent);
  transform-origin: left center;
  transform: scaleX(0);
}

.sessions { margin: 0 0 20px; color: var(--muted); }
.sessions strong { color: var(--text); }

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.btn {
  min-height: 44px;
  min-width: 44px;
  padding: 10px 18px;
  font: inherit;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn-primary {
  flex: 1 1 100%;
  font-size: 1.125rem;
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.btn-small { font-size: .9375rem; font-weight: 500; }
.btn:disabled { opacity: .6; cursor: default; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.hint { margin: 12px 0 0; font-size: .875rem; color: var(--muted); }

.settings {
  margin-top: 28px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: left;
}
.settings h2 { margin: 0 0 12px; font-size: 1rem; }

.fields {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.field { display: flex; flex-direction: column; gap: 4px; font-size: .875rem; color: var(--muted); }
.field input {
  width: 100%;
  min-height: 44px;
  padding: 8px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.note { margin: 8px 0 0; font-size: .875rem; color: var(--muted); }
.note:empty { display: none; }

.footer {
  padding: 16px;
  text-align: center;
  font-size: .8125rem;
  color: var(--muted);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 380px) {
  .fields { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: no-preference) {
  .bar-fill { transition: transform .3s linear; }
}