:root {
  --paper: #fbf8f1;
  --surface: #f3ecdd;
  --ink: #24211c;
  --muted: #6a604e;
  --line: #e3dac6;
  --accent: #1f4e79;
  --accent-ink: #ffffff;
  --mark: #d9a441;
  --serif: Georgia, 'Iowan Old Style', 'Times New Roman', serif;
  --sans: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1a1814;
    --surface: #27241e;
    --ink: #efe9dc;
    --muted: #a99f8c;
    --line: #38342b;
    --accent: #8fbbe3;
    --accent-ink: #12283c;
    --mark: #e0b35c;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent); }

button { font: inherit; color: inherit; }

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

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 20px;
  max-width: 680px;
  margin: 0 auto;
  padding: 18px 16px 12px;
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--ink);
  font-size: 22px;
  font-weight: 700;
  text-decoration: none;
}

.site-header nav { display: flex; gap: 16px; font-family: var(--sans); font-size: 15px; }

.site-header nav a { color: var(--muted); text-decoration: none; padding: 6px 0; }

.site-header nav a[aria-current='page'] {
  color: var(--ink);
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--accent);
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 20px 16px 200px;
}

h1, h2 { line-height: 1.2; }

.intro { color: var(--muted); font-size: 17px; margin: 0 0 18px; }

.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 24px; font-family: var(--sans); }

.chip {
  padding: 8px 14px;
  border: 0;
  border-radius: 99px;
  background: var(--surface);
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.chip[aria-pressed='true'] { background: var(--accent); color: var(--accent-ink); }

.day { margin: 28px 0 4px; font-family: var(--sans); font-size: 13px; font-weight: 700; color: var(--muted); }

.day:first-of-type { margin-top: 0; }

.story {
  display: block;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
}

.topic {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.story h2 { margin: 3px 0 4px; font-size: 22px; }

.story .meta { font-family: var(--sans); font-size: 13px; color: var(--muted); }

.back { display: inline-block; margin-bottom: 14px; font-family: var(--sans); font-size: 14px; text-decoration: none; }

.article-title { margin: 6px 0 16px; font-size: 28px; }

.tabs { display: flex; gap: 6px; margin-bottom: 20px; font-family: var(--sans); }

.tab {
  flex: 1;
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}

.tab[aria-selected='true'] { background: var(--accent); color: var(--accent-ink); }

.article-text p { margin: 0 0 18px; }

.word {
  padding: 0;
  border: 0;
  border-radius: 3px;
  background: none;
  cursor: pointer;
  text-align: inherit;
  font-weight: inherit;
}

.word.key { font-weight: 700; box-shadow: inset 0 -2px 0 var(--mark); }

.word.active { background: var(--mark); color: #24211c; box-shadow: none; }

@media (hover: hover) {
  .word:hover { background: var(--surface); }
  .word.active:hover { background: var(--mark); }
}

.source { margin-top: 28px; padding-top: 14px; border-top: 1px solid var(--line); font-family: var(--sans); font-size: 14px; color: var(--muted); }

.sheet {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 10;
  max-width: 680px;
  margin: 0 auto;
  padding: 14px 16px calc(14px + env(safe-area-inset-bottom));
  border-radius: 14px 14px 0 0;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.4;
  box-shadow: 0 -8px 24px rgb(0 0 0 / 0.2);
}

.sheet-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }

.sheet-word { font-size: 19px; font-weight: 700; }

.sheet-meaning { overflow-wrap: anywhere; }

.sheet-note { margin-top: 6px; font-size: 13px; opacity: 0.85; }

.sheet-close { min-width: 44px; min-height: 44px; margin: -10px -10px 0 0; border: 0; background: none; color: inherit; font-size: 24px; cursor: pointer; }

.sheet-save {
  width: 100%;
  min-height: 44px;
  margin-top: 10px;
  border: 1px solid currentColor;
  border-radius: 8px;
  background: none;
  color: inherit;
  font-weight: 700;
  cursor: pointer;
}

.saved { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line); }

.saved strong { display: block; font-size: 20px; }

.saved a { font-family: var(--sans); font-size: 13px; }

.remove { flex: none; min-height: 44px; padding: 0 12px; border: 1px solid var(--line); border-radius: 8px; background: none; color: var(--muted); font-family: var(--sans); font-size: 14px; cursor: pointer; }

.message { padding: 28px 0; color: var(--muted); }

.retry { min-height: 44px; padding: 0 16px; border: 0; border-radius: 8px; background: var(--accent); color: var(--accent-ink); font-family: var(--sans); font-weight: 700; cursor: pointer; }

@media (min-width: 720px) {
  body { font-size: 20px; }
  .article-title { font-size: 38px; }
  .sheet { bottom: 16px; border-radius: 14px; }
}