/* Flashcards. Colours and type come from ../shared/theme.css. */

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(62deg, rgba(28, 25, 21, 0.014) 0 1px, transparent 1px 9px),
    repeating-linear-gradient(-62deg, rgba(28, 25, 21, 0.012) 0 1px, transparent 1px 13px);
  font-family: var(--serif);
  color: var(--ink);
}

#app {
  width: min(720px, calc(100% - 48px));
  margin: 28px auto 64px;
}

/* ---------- head ---------- */

.cards-head { margin-bottom: 22px; }
.cards-head h1 {
  margin: 0;
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 600;
}
.cards-sub {
  margin: 10px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-strong);
  box-shadow: 0 3px 0 -2px var(--line);
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink-2);
}

.btn-back {
  display: inline-block;
  margin-bottom: 14px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.btn-back:hover { border-color: var(--cinnabar); color: var(--cinnabar); }

/* ---------- panels ---------- */

.cards-panel {
  margin-bottom: 18px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cinnabar);
  border-radius: var(--radius);
  background: var(--paper-2);
}
.cards-panel h2 {
  margin: 0 0 14px;
  font-size: 22px;
  font-weight: 600;
}

/* ---------- the strength bar: how well the deck is known ---------- */

.strength-bar {
  display: flex;
  height: 12px;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--paper-3);
}
.strength-bar .seg { display: block; }

.seg-learning, .dot-learning { background: var(--cinnabar); }
.seg-familiar, .dot-familiar { background: #c2763f; }
.seg-known,    .dot-known    { background: var(--celadon); }
.seg-mastered, .dot-mastered { background: #4f6b55; }
.seg-new,      .dot-new      { background: var(--paper-3); }

.strength-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
}
.strength-legend li { display: inline-flex; align-items: center; gap: 7px; }
.strength-legend .dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.legend-label { color: var(--ink-2); }
.legend-count { font-weight: 600; }

/* ---------- queue ---------- */

.queue-line { margin: 0 0 16px; font-size: 19px; }
.queue-line strong { font-size: 24px; font-weight: 600; }
.queue-sep { color: var(--ink-3); }
.queue-done { margin: 0; font-size: 17px; color: var(--ink-2); }
.queue-note { margin: 12px 0 0; font-size: 14px; color: var(--ink-3); }

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 26px;
  border: 0;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper-2);
  font: inherit;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
}
.btn-primary:hover { background: var(--cinnabar); }

.cards-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn-ghost {
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 15px;
  cursor: pointer;
}
.btn-ghost:hover { border-color: var(--cinnabar); color: var(--cinnabar); }

.session-done {
  margin: 0 0 18px;
  padding: 10px 14px;
  border-left: 2px solid var(--celadon);
  background: var(--celadon-l);
  font-size: 15px;
}

.cards-error { font-size: 17px; color: var(--cinnabar); }

/* ---------- browse ---------- */

.word-list { margin: 0; padding: 0; list-style: none; }
.word-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--paper-2);
  margin-bottom: 8px;
}
.word-hanzi {
  flex: none;
  min-width: 62px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 30px;
  line-height: 1;
  text-align: left;
  cursor: pointer;
}
.word-hanzi:hover { color: var(--cinnabar); }
.word-text { flex: 1; min-width: 0; }
.word-pinyin { display: block; font-size: 15px; color: var(--ink-2); }
.word-english { display: block; font-size: 15px; }
.word-meta { flex: none; text-align: right; }
.word-due { display: block; margin-top: 4px; font-size: 12px; color: var(--ink-3); }

.tag {
  display: inline-block;
  padding: 3px 9px;
  border-radius: var(--radius);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.tag-new      { background: var(--paper-3); color: var(--ink-3); }
.tag-learning { background: var(--cinnabar); color: var(--paper-2); }
.tag-familiar { background: #c2763f; color: var(--paper-2); }
.tag-known    { background: var(--celadon); color: var(--paper-2); }
.tag-mastered { background: #4f6b55; color: var(--paper-2); }

/* ---------- session ---------- */

.session-top { display: flex; align-items: center; gap: 14px; margin-bottom: 30px; }
.btn-close {
  flex: none;
  border: 0;
  background: transparent;
  color: var(--ink-3);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}
.btn-close:hover { color: var(--cinnabar); }
.session-progress {
  flex: 1;
  height: 6px;
  border-radius: var(--radius);
  background: var(--paper-3);
  overflow: hidden;
}
.session-fill { display: block; height: 100%; background: var(--cinnabar); transition: width 0.2s; }
.session-count { flex: none; font-size: 13px; color: var(--ink-3); }

.card-face {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 44px 24px 34px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cinnabar);
  border-radius: var(--radius);
  background: var(--paper-2);
  text-align: center;
}
.card-flag {
  padding: 4px 10px;
  border-radius: var(--radius);
  background: var(--cinnabar);
  color: var(--paper-2);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.card-hanzi {
  font-size: clamp(72px, 18vw, 128px);
  line-height: 1.05;
  cursor: pointer;
}
.card-pinyin { font-size: 26px; color: var(--cinnabar); }
.card-english { font-size: 21px; color: var(--ink-2); }
.card-hint { font-size: 16px; color: var(--ink-3); }

.btn-sound {
  margin-top: 4px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink-2);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.btn-sound:hover { border-color: var(--cinnabar); color: var(--cinnabar); }

.session-foot { display: flex; gap: 10px; margin-top: 22px; }
.session-foot .btn-primary { flex: 1; }

.btn-grade {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  min-height: 62px;
  padding: 10px 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  font: inherit;
  cursor: pointer;
}
.grade-label { font-size: 16px; font-weight: 600; }
.grade-when { font-size: 12px; color: var(--ink-3); }
.btn-grade:hover { background: var(--paper-2); }
.grade-again { border-color: var(--cinnabar); color: var(--cinnabar); }
.grade-again .grade-when { color: var(--cinnabar); }
.grade-easy { border-color: var(--celadon); }

.session-keys {
  margin: 16px 0 0;
  text-align: center;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}

@media (max-width: 760px) {
  #app { width: min(100% - 24px, 720px); margin-top: 14px; }
  .cards-panel { padding: 18px 16px; }
  .word-row { gap: 12px; padding: 10px; }
  .word-hanzi { min-width: 48px; font-size: 26px; }
  .session-foot { flex-direction: column; }
}