:root {
  color-scheme: light dark;
  font-family: "Inter", system-ui, sans-serif;
  --paper: #f7f7f1;
  --ink: #222820;
  --muted: #50594c;
  --line: #d8dbd1;
  --accent: #305538;
  --soft: #e7ede1;
  --surface: #fefefa;
  --error: #952e26;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #191e1b;
    --ink: #edf1e9;
    --muted: #bbc4b7;
    --line: #414c42;
    --accent: #b6dbb9;
    --soft: #2c3a2d;
    --surface: #222a24;
    --error: #ffb5aa;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { background: var(--paper); color: var(--ink); margin: 0; }
button, input { font: inherit; color: inherit; }
button {
  appearance: none;
  border: 0;
  background: none;
  min-block-size: 44px;
  cursor: pointer;
  padding: 0 12px;
  border-radius: 8px;
}
button:disabled { cursor: wait; opacity: .55; }
button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.top, main, .footer { max-inline-size: 32rem; margin-inline: auto; }
.top {
  padding: max(10px, env(safe-area-inset-top)) max(22px, env(safe-area-inset-right)) 0 max(22px, env(safe-area-inset-left));
}
nav { display: flex; align-items: center; gap: 10px; border-bottom: 1px solid var(--line); }
nav button { border-radius: 0; padding: 0 5px; color: var(--muted); }
nav button[aria-current] { color: var(--ink); font-weight: 650; box-shadow: inset 0 -2px var(--accent); }
nav .settings { margin-inline-start: auto; }
main { padding: 27px max(22px, env(safe-area-inset-right)) 0 max(22px, env(safe-area-inset-left)); }
h1, h2, p { margin: 0; }
h1 { font: 400 2.65rem/1.06 "Instrument Serif", Georgia, serif; margin-block-end: 12px; letter-spacing: -.04em; }
h2 { font-size: 1.1rem; margin-bottom: 10px; }
.eyebrow, .hint { font-size: .875rem; color: var(--muted); }
.eyebrow { margin-block-end: 4px; }
.list { margin: 0; padding: 0; list-style: none; }
.habit, .study { border-bottom: 1px solid var(--line); }
.row { width: 100%; display: flex; align-items: center; justify-content: space-between; text-align: start; padding: 9px 2px; min-height: 52px; gap: 18px; border-radius: 0; }
.label { font-weight: 650; }
.note { display: block; color: var(--muted); font-size: .8125rem; line-height: 1.45; margin-top: 2px; }
.check {
  inline-size: 23px;
  block-size: 23px;
  flex: none;
  display: grid;
  place-items: center;
  border: 1px solid var(--muted);
  border-radius: 50%;
  font-size: .95rem;
}
.row[aria-pressed="true"] .check { background: var(--accent); border-color: var(--accent); color: var(--paper); }
.study { padding: 10px 2px 12px; }
.study-heading { display: flex; align-items: center; justify-content: space-between; }
.study-heading button { color: var(--accent); }
.study progress { width: 100%; height: 7px; accent-color: var(--accent); display: block; margin-block: 2px 7px; }
.steps { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 6px; }
.steps button { background: var(--soft); color: var(--accent); font-weight: 650; }
.footer { padding: 14px 22px max(18px, env(safe-area-inset-bottom)); }
#status { color: var(--muted); font-size: .8rem; min-height: 1em; }
.feedback { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.feedback button, .back { color: var(--accent); padding-inline: 0; }
.actions, .period { display: flex; justify-content: flex-end; gap: 8px; margin-top: 10px; }
.period { justify-content: flex-start; margin-bottom: 12px; }
.period [aria-pressed="true"] { background: var(--soft); color: var(--accent); }
.report { display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); gap: 12px; margin-block: 12px 18px; }
.report strong { display: block; font-size: 1.18rem; }
.calendar { display: grid; grid-template-columns: repeat(7,minmax(0,1fr)); gap: 4px; margin-block: 14px; }
.calendar button { background: var(--soft); color: var(--accent); padding-inline: 0; }
.calendar button small { display: block; line-height: 1; }
.date-field { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.breakdown { list-style: none; margin: 12px 0 0; padding: 0; }
.breakdown li { display: flex; justify-content: space-between; gap: 12px; padding-block: 8px; border-bottom: 1px solid var(--line); }
dialog { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; color: var(--ink); inline-size: min(25rem, calc(100vw - 30px)); padding: 22px; }
dialog::backdrop { background: rgb(0 0 0 / 45%); }
dialog label { display: block; margin-block: 10px 4px; }
input { min-block-size: 44px; background: var(--surface); border: 1px solid var(--line); border-radius: 7px; padding: 6px 10px; }
dialog input { width: 100%; }
dialog .hint, dialog .error { margin-top: 8px; }
.error { color: var(--error); }
.primary { background: var(--accent); color: var(--paper); }