:root {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", sans-serif;
  color: #1c261b;
  background: #f6f2e8;
  --paper: #f6f2e8;
  --ink: #1c261b;
  --muted: #6e7469;
  --line: rgba(28, 38, 27, 0.14);
  --green: #5d7d46;
  --green-dark: #2f4728;
  --green-soft: #dfe9d4;
  --sand: #e7dbc3;
  --white: #fffdf7;
  --danger: #a74d42;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--paper); }
body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  background:
    radial-gradient(circle at 82% 8%, rgba(93, 125, 70, 0.14), transparent 28%),
    linear-gradient(180deg, #faf7ef 0%, var(--paper) 100%);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }

.app-shell {
  width: min(100%, 720px);
  min-height: 100svh;
  margin: 0 auto;
  padding: max(14px, env(safe-area-inset-top)) 18px max(34px, env(safe-area-inset-bottom));
}

.topbar {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 5px 0 24px;
}
.topbar h1 {
  margin: 2px 0 0;
  font-size: clamp(22px, 5.6vw, 30px);
  letter-spacing: -0.055em;
  line-height: 1;
}
.eyebrow {
  margin: 0;
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .16em;
}
.home-link, .ghost-btn, .text-btn {
  border: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.home-link {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 50%;
  text-decoration: none;
  font-size: 22px;
}
.ghost-btn {
  color: var(--muted);
  font-size: 12px;
  padding: 10px 4px;
}

.screen { display: none; animation: enter .28s ease both; }
.screen.is-active { display: block; }
@keyframes enter { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.intro-card, .choice-card, .timeline-card, .buffer-block, .focus-card {
  border: 1px solid var(--line);
  background: rgba(255, 253, 247, .82);
  box-shadow: 0 12px 34px rgba(40, 48, 36, .055);
}
.intro-card {
  border-radius: 26px;
  padding: 24px 22px;
}
.mini-label {
  display: inline-block;
  margin: 0 0 18px;
  padding: 7px 10px;
  border-radius: 999px;
  background: var(--green-soft);
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 800;
}
.intro-card h2, .reclaim-hero h2, .focus-card h2, #doneTitle {
  margin: 0;
  letter-spacing: -0.05em;
  line-height: 1.05;
}
.intro-card h2 { font-size: clamp(38px, 10vw, 62px); }
.support {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}
.strong-support { color: var(--ink); font-weight: 750; }

.time-input-wrap {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 17px 18px;
  border-bottom: 1px solid var(--line);
}
.time-input-wrap label { font-size: 13px; font-weight: 800; }
.time-input-wrap input {
  min-width: 142px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-size: 34px;
  font-weight: 900;
  letter-spacing: -0.04em;
  text-align: right;
}

.buffer-block {
  margin-top: 16px;
  border-radius: 22px;
  padding: 18px;
}
.section-title-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}
.section-title-row.compact { align-items: flex-start; }
.section-title-row > div { display: flex; gap: 10px; align-items: center; }
.step-no {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  font-size: 12px;
  font-weight: 900;
  flex: 0 0 auto;
}
.section-title-row h3 { margin: 0; font-size: 15px; letter-spacing: -0.03em; }
#bufferOutput { font-size: 22px; font-weight: 900; }
#bufferRange { width: 100%; margin: 24px 0 5px; accent-color: var(--green); }
.range-legend { display: flex; justify-content: space-between; color: var(--muted); font-size: 12px; }

.primary-btn, .secondary-btn {
  width: 100%;
  border-radius: 18px;
  min-height: 58px;
  padding: 15px 18px;
  font-weight: 900;
  cursor: pointer;
  transition: transform .12s ease, opacity .12s ease;
}
.primary-btn:active, .secondary-btn:active { transform: scale(.985); }
.primary-btn {
  margin-top: 18px;
  border: 0;
  background: var(--ink);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 16px;
}
.primary-btn span { font-size: 22px; }
.primary-btn:disabled { opacity: .35; cursor: not-allowed; }
.secondary-btn {
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
}
.text-btn {
  display: block;
  margin: 13px auto 0;
  padding: 10px;
  color: var(--muted);
  font-size: 12px;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.inline-error { min-height: 20px; color: var(--danger); font-size: 12px; text-align: center; }

.reclaim-hero {
  padding: 22px 4px 18px;
  text-align: center;
}
.usable-number {
  margin: 8px 0 2px;
  font-size: clamp(58px, 17vw, 104px);
  font-weight: 950;
  line-height: .92;
  letter-spacing: -0.08em;
  color: var(--green-dark);
  font-variant-numeric: tabular-nums;
}
.reclaim-hero h2 { font-size: clamp(28px, 7vw, 42px); }
.timeline-card { border-radius: 22px; padding: 18px; }
.timeline-track {
  display: flex;
  height: 54px;
  overflow: hidden;
  border-radius: 16px;
  background: #e9e6dc;
}
.timeline-free, .timeline-buffer { display: flex; align-items: center; justify-content: center; min-width: 0; }
.timeline-free { background: var(--green); color: #fff; }
.timeline-buffer { background: var(--sand); color: #5b4e3d; }
.timeline-free span, .timeline-buffer span { font-size: 12px; font-weight: 900; white-space: nowrap; }
.timeline-times {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  margin-top: 9px;
  color: var(--muted);
  font-size: 12px;
}
.timeline-times span:nth-child(2) { text-align: center; }
.timeline-times span:last-child { text-align: right; }
.choice-card { margin-top: 16px; border-radius: 22px; padding: 18px; }
.duration-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 17px;
}
.duration-btn {
  min-height: 58px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--white);
  color: var(--ink);
  font-weight: 900;
  cursor: pointer;
}
.duration-btn small { display: block; margin-top: 2px; color: var(--muted); font-size: 12px; font-weight: 700; }
.duration-btn.is-selected { background: var(--green-dark); border-color: var(--green-dark); color: #fff; }
.duration-btn.is-selected small { color: rgba(255,255,255,.7); }
.duration-btn:disabled { opacity: .25; cursor: not-allowed; }
.task-field { display: block; margin-top: 18px; }
.task-field span { display: block; margin-bottom: 7px; color: var(--muted); font-size: 12px; font-weight: 800; }
.task-field input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: #fff;
  color: var(--ink);
  padding: 15px 14px;
  font-size: 16px;
  outline: none;
}
.task-field input:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(93,125,70,.12); }

.focus-card {
  margin-top: 8vh;
  border-radius: 30px;
  padding: 28px 22px;
  text-align: center;
}
.focus-task { margin: 18px auto 0; font-size: 17px; font-weight: 900; line-height: 1.5; }
.focus-clock {
  margin: 16px 0 10px;
  font-size: clamp(72px, 22vw, 124px);
  font-weight: 950;
  line-height: .9;
  letter-spacing: -0.07em;
  font-variant-numeric: tabular-nums;
}
.focus-card h2 { font-size: clamp(24px, 6.7vw, 38px); }
.progress-track { height: 8px; margin-top: 24px; overflow: hidden; border-radius: 999px; background: #e6e3d8; }
#progressBar { width: 0; height: 100%; background: var(--green); transition: width .25s linear; }
.focus-actions { margin-top: 14px; }
.focus-actions .primary-btn { margin-top: 0; }
.focus-actions .secondary-btn { margin-top: 10px; }

#doneScreen { padding-top: 8vh; text-align: center; }
.done-mark {
  display: grid;
  place-items: center;
  width: 88px;
  height: 88px;
  margin: 0 auto 22px;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  font-size: 44px;
  box-shadow: 0 16px 34px rgba(68, 98, 49, .18);
}
#doneTitle { margin-top: 8px; font-size: clamp(42px, 11vw, 68px); }
.done-copy { margin: 16px auto 0; max-width: 500px; color: var(--muted); font-size: 15px; line-height: 1.8; }
.done-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 28px; }
.done-stats > div { padding: 20px 12px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,253,247,.72); }
.done-stats strong { display: block; font-size: 30px; }
.done-stats span { display: block; margin-top: 3px; color: var(--muted); font-size: 12px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(20px + env(safe-area-inset-bottom));
  transform: translate(-50%, 18px);
  max-width: calc(100% - 32px);
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(28,38,27,.94);
  color: #fff;
  font-size: 12px;
  opacity: 0;
  pointer-events: none;
  transition: .2s ease;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 520px) {
  .app-shell { padding-left: 14px; padding-right: 14px; }
  .topbar { grid-template-columns: 40px minmax(0, 1fr) auto; padding-bottom: 18px; }
  .duration-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .time-input-wrap { padding-left: 8px; padding-right: 8px; }
  .time-input-wrap input { min-width: 126px; font-size: 30px; }
  .timeline-track { height: 50px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}