/* Design tokens shared with the nihon app (ink background, paper panels,
   vermilion accent, offset shadows) so both learning sites look the same. */
:root {
  --ink-bg: #26343c;
  --ink-bg-deep: #1b262c;
  --paper: #f1ead6;
  --grid-line: rgba(38, 32, 20, 0.07);
  --ink-line: rgba(38, 32, 20, 0.18);
  --ink-line-strong: rgba(38, 32, 20, 0.35);
  --ink-text: #262019;
  --ink-muted: #6b6255;
  --mist: #8fa3a8;
  --shu: #c1440e;
  --shu-dark: #9c360b;
  --shu-soft-bg: rgba(193, 68, 14, 0.08);
  --done: #2f6b4f;
  --done-soft: rgba(47, 107, 79, 0.12);
  --font-serif: 'BIZ UDPMincho', 'Noto Serif JP', Georgia, serif;
  --font-sans: 'Be Vietnam Pro', 'Segoe UI', system-ui, sans-serif;
  --shadow-offset: 6px 6px 0 rgba(15, 20, 23, 0.35);
  --shadow-offset-sm: 4px 4px 0 rgba(15, 20, 23, 0.35);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  background: radial-gradient(circle at 50% -10%, #33434c 0%, #212d34 55%, var(--ink-bg-deep) 100%);
  min-height: 100vh;
  padding: 20px;
  color: var(--ink-text);
  line-height: 1.5;
}

a { color: var(--shu); }
.muted { color: var(--ink-muted); }

.container { max-width: 760px; margin: 0 auto; }

/* ---------- header ---------- */
/* Link back to the tuanpham.site landing page (same in every app) */
.site-home {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 0.8rem;
  color: var(--mist);
  text-decoration: none;
}
.site-home:hover { color: var(--paper); }
.app-header { text-align: center; margin-bottom: 26px; }
.app-mark {
  font-family: var(--font-serif);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.05em;
  text-decoration: none;
}
.app-tagline {
  font-size: 0.85rem;
  color: var(--mist);
  letter-spacing: 0.03em;
  margin-top: 2px;
}

/* ---------- paper panel ---------- */
.panel {
  display: block;
  background: var(--paper);
  border: 1px solid var(--ink-line);
  border-radius: 4px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-offset);
}

.tabs {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  margin: -8px 0 20px;
  border-bottom: 1px solid var(--ink-line);
}
.tab {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 10px 18px;
  border-bottom: 3px solid transparent;
  color: var(--ink-muted);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s, border-color 0.2s;
}
.tab:hover { color: var(--ink-text); }
.tab.active { color: var(--shu); border-bottom-color: var(--shu); }

h1 { font-size: 1.25rem; font-weight: 700; margin-bottom: 8px; }

.footer {
  text-align: center;
  color: var(--mist);
  font-size: 0.8rem;
  padding: 4px 8px 12px;
}
.footer a { color: var(--paper); }

/* ---------- home ---------- */
.hero { margin-bottom: 20px; }
.hero p { color: var(--ink-muted); }
.lessons {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.lesson-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 24px;
  background: var(--paper);
  color: var(--ink-text);
  border: 1px solid var(--ink-line);
  border-radius: 4px;
  box-shadow: var(--shadow-offset-sm);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.1s;
}
.lesson-card:hover:not(.disabled) { border-color: var(--shu); }
.lesson-card:active { transform: translate(2px, 2px); }
.lesson-card.disabled { opacity: .55; }
.lesson-card h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--shu);
}
.lesson-card p { color: var(--ink-muted); font-size: 0.9rem; }
.lesson-num {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-muted);
}
.progress-mini { font-size: .85rem; color: var(--done); font-weight: 600; }

/* ---------- list pages ---------- */
.progress { display: flex; align-items: center; gap: .75rem; margin: 16px 0; }
.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--ink-line);
  border-radius: 2px;
  overflow: hidden;
}
#progress-fill { height: 100%; width: 0; background: var(--done); transition: width .3s; }
#progress-text { font-size: .85rem; color: var(--ink-muted); white-space: nowrap; }

.controls { display: flex; gap: 8px; margin-bottom: 12px; }
.controls input, .controls select {
  padding: 8px 12px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  border: 1px solid var(--ink-line);
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink-text);
}
.controls input:focus, .controls select:focus { outline: none; border-color: var(--shu); }
.controls input { flex: 1; min-width: 0; }

.ranges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.range {
  padding: 8px 14px;
  border: 1px solid var(--ink-line);
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink-text);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.range:hover { border-color: var(--ink-line-strong); }
.range small { margin-left: .4rem; color: var(--ink-muted); font-weight: 400; }
.range.active { background: var(--ink-text); border-color: var(--ink-text); color: var(--paper); }
.range.active small { color: var(--mist); }

.word-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
}
.word {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  background: var(--paper);
  border: 1px solid var(--ink-line);
  border-left: 3px solid transparent;
  border-radius: 3px;
  padding: 6px 6px 6px 10px;
  transition: background 0.15s, border-color 0.15s;
}
.word:hover { border-left-color: var(--ink-line-strong); background: rgba(38, 32, 20, 0.04); }
.word.learned { background: var(--done-soft); border-left-color: var(--done); }
.rank { font-size: .75rem; color: var(--ink-muted); min-width: 2.3rem; font-variant-numeric: tabular-nums; }
.word-text {
  flex: 1;
  min-width: 0;
  text-align: left;
  background: none;
  border: none;
  color: var(--ink-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  padding: 2px 0;
  overflow-wrap: anywhere;
}
.word-text:hover { color: var(--shu); }
.icon-btn {
  flex: 0 0 auto;
  background: var(--paper);
  border: 1px solid var(--ink-line);
  border-radius: 3px;
  cursor: pointer;
  font-size: .9rem;
  padding: 3px 7px;
  color: var(--ink-muted);
}
.icon-btn:hover { border-color: var(--ink-line-strong); color: var(--ink-text); }
.word.learned .check { color: var(--paper); background: var(--done); border-color: var(--done); }

/* ---------- detail dialog ---------- */
dialog {
  width: min(560px, 92vw);
  max-height: 85vh;
  margin: auto;
  border: 1px solid var(--ink-line);
  border-radius: 4px;
  padding: 20px 24px;
  background: var(--paper);
  color: var(--ink-text);
  box-shadow: var(--shadow-offset);
}
dialog::backdrop { background: rgba(15, 20, 23, 0.6); }
.close {
  position: absolute;
  right: .75rem; top: .5rem;
  border: none; background: none;
  font-size: 1.6rem;
  color: var(--ink-muted);
  cursor: pointer;
}
.close:hover { color: var(--shu); }
.detail-head { display: flex; align-items: center; flex-wrap: wrap; gap: .6rem; padding-right: 2rem; }
.detail-head h2 { font-family: var(--font-serif); font-size: 1.8rem; color: var(--ink-text); }
.meaning { margin-top: 1rem; }
.pos {
  display: inline-block;
  font-size: .8rem;
  font-style: italic;
  background: var(--shu-soft-bg);
  color: var(--shu);
  border-radius: 3px;
  padding: .1rem .5rem;
}
.meaning ol { margin: .4rem 0 0; padding-left: 1.3rem; }
.meaning li { margin-bottom: .35rem; }
.example { color: var(--ink-muted); font-style: italic; }
.links { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 1.25rem; padding-top: .75rem; border-top: 1px solid var(--ink-line); }

@media (max-width: 600px) {
  body { padding: 12px; }
  .panel { padding: 18px 14px; }
  .app-mark { font-size: 1.5rem; }
  .controls { flex-direction: column; }
  .word-list { grid-template-columns: 1fr 1fr; }
  .rank { min-width: 1.8rem; }
  .word .speak { display: none; }
}

/* ---------- phrases ---------- */
.note { display: block; font-size: .75rem; font-weight: 400; color: var(--ink-muted); }
#d-note { font-size: 1rem; }