/* ==========================================================================
   Components
   ========================================================================== */

/* --- Seal mark (used once, as brand mark only) --- */
.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  background: var(--color-cinnabar);
  color: var(--color-ivory-raised);
  font-family: var(--font-hanzi);
  font-size: 1.15rem;
  border-radius: 6px 6px 6px 2px;
  flex-shrink: 0;
  box-shadow: var(--shadow-card);
}

/* --- Top navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(247, 243, 234, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.brand-name {
  font-family: var(--font-hanzi);
  font-size: var(--text-lg);
  font-weight: 600;
}
.brand-name .sub {
  display: block;
  font-family: var(--font-body);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  font-weight: 500;
}
.main-nav {
  display: flex;
  gap: var(--space-5);
}
.main-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-soft);
  padding-block: var(--space-2);
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-cinnabar);
}
.header-status {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-sm);
}
.streak-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  color: var(--color-cinnabar-dark);
  font-weight: 600;
}
.nav-toggle { display: none; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-base);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--color-cinnabar);
  color: var(--color-ivory-raised);
  box-shadow: var(--shadow-card);
}
.btn-primary:hover { background: var(--color-cinnabar-dark); }
.btn-secondary {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-border-strong);
}
.btn-secondary:hover { border-color: var(--color-ink); background: rgba(46,39,33,0.03); }
.btn-block { width: 100%; }
.btn-sm { padding: 0.45rem 0.9rem; font-size: var(--text-sm); }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }

/* --- Cards --- */
.card {
  background: var(--color-ivory-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}
.card-pad { padding: var(--space-5); }

/* --- Level / lesson selector cards --- */
.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--space-4);
}
.level-card {
  padding: var(--space-5) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-ivory-raised);
  text-align: left;
  cursor: pointer;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.level-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-raised); }
.level-card.is-active { border-color: var(--color-cinnabar); box-shadow: var(--shadow-raised); }
.level-card.is-locked { opacity: 0.5; cursor: default; }
.level-card.is-locked:hover { transform: none; box-shadow: var(--shadow-card); }
.level-card .hanzi { font-size: var(--text-2xl); display: block; margin-bottom: var(--space-2); color: var(--color-cinnabar); }
.level-card .label { font-weight: 600; }
.level-card .meta { font-size: var(--text-sm); color: var(--color-ink-soft); }

.lesson-list { display: flex; flex-direction: column; gap: var(--space-3); }
.lesson-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-ivory-raised);
  transition: border-color var(--transition), transform var(--transition);
}
.lesson-row:hover { border-color: var(--color-gold); transform: translateX(2px); }
.lesson-row .num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-gold);
  width: 2.4rem;
  text-align: center;
  flex-shrink: 0;
}
.lesson-row .info { flex: 1; min-width: 0; }
.lesson-row .titles { display: flex; align-items: baseline; gap: var(--space-2); flex-wrap: wrap; }
.lesson-row .title-cn { font-family: var(--font-hanzi); color: var(--color-ink-soft); font-size: var(--text-sm); }
.lesson-row .meta { font-size: var(--text-sm); color: var(--color-ink-soft); margin-top: 2px; }
.lesson-row .status { flex-shrink: 0; }

/* --- Progress bar --- */
.progress-track {
  width: 100%;
  height: 8px;
  border-radius: 99px;
  background: var(--color-border);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-cinnabar));
  transition: width 400ms ease;
}
.progress-fill.jade { background: var(--color-jade); }
.progress-row { display: flex; align-items: center; gap: var(--space-3); }
.progress-row .progress-track { flex: 1; }
.progress-row .progress-label { font-size: var(--text-sm); color: var(--color-ink-soft); min-width: 3ch; text-align: right; }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-4);
}
.stat-item .stat-label { font-size: var(--text-sm); color: var(--color-ink-soft); margin-bottom: var(--space-1); }

/* --- Reusable text treatments (used inside and outside flip cards) --- */
.hanzi-big { font-family: var(--font-hanzi); font-size: var(--text-3xl); line-height: 1; }
.pinyin { color: var(--color-cinnabar); font-size: var(--text-sm); margin-top: var(--space-2); }
.meaning { font-size: var(--text-lg); margin-top: var(--space-2); }

/* --- Flashcard / Vocabulary card --- */
.vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-4);
}
.flip-card {
  perspective: 1200px;
  height: 190px;
}
.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 480ms cubic-bezier(.2,.8,.2,1);
  transform-style: preserve-3d;
  cursor: pointer;
}
.flip-card.is-flipped .flip-card-inner { transform: rotateY(180deg); }
.flip-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-ivory-raised);
  box-shadow: var(--shadow-card);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
}
.flip-face-back { transform: rotateY(180deg); }
.flip-face .hanzi-big { font-family: var(--font-hanzi); font-size: var(--text-3xl); line-height: 1; }
.flip-face .pinyin { color: var(--color-cinnabar); font-size: var(--text-sm); margin-top: var(--space-2); }
.flip-face .meaning { font-size: var(--text-lg); margin-top: var(--space-2); }
.flip-face .example { font-size: var(--text-sm); color: var(--color-ink-soft); margin-top: auto; padding-top: var(--space-2); border-top: 1px dashed var(--color-border); }
.flip-face .example-pinyin { color: var(--color-cinnabar); font-style: normal; }
.flip-face .card-top { display: flex; align-items: flex-start; justify-content: space-between; }
.save-star {
  background: none; border: none; cursor: pointer; font-size: 1.1rem;
  color: var(--color-border-strong); line-height: 1; padding: 2px;
}
.save-star.is-saved { color: var(--color-gold); }
.vocab-cat-tag {
  align-self: flex-start;
  font-size: var(--text-xs);
  color: var(--color-jade);
  background: var(--color-jade-soft);
  padding: 2px 8px;
  border-radius: 99px;
  margin-top: var(--space-2);
}

/* --- Filter bar --- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}
.chip {
  padding: 0.4rem 0.9rem;
  border-radius: 99px;
  border: 1px solid var(--color-border-strong);
  background: transparent;
  font-size: var(--text-sm);
  cursor: pointer;
  color: var(--color-ink-soft);
  transition: all var(--transition);
}
.chip:hover { border-color: var(--color-ink); color: var(--color-ink); }
.chip.is-active { background: var(--color-ink); color: var(--color-ivory-raised); border-color: var(--color-ink); }
.search-input {
  flex: 1;
  min-width: 200px;
  padding: 0.6rem 1rem;
  border-radius: 99px;
  border: 1px solid var(--color-border-strong);
  background: var(--color-ivory-raised);
  color: var(--color-ink);
}
.search-input:focus { border-color: var(--color-cinnabar); }

/* --- Lesson step view --- */
.lesson-main { padding-block: var(--space-5); }
.step-shell { max-width: 560px; margin: 0 auto; }

.lesson-hero { text-align: center; margin-bottom: var(--space-4); }
.lesson-hero .eyebrow { justify-content: center; }
.lesson-hero-title {
  font-size: var(--text-lg);
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.lesson-hero-title .num { font-family: var(--font-display); color: var(--color-gold); }
.lesson-hero-title .title-cn { font-size: var(--text-sm); color: var(--color-ink-soft); }

.step-progress-dots { display: flex; gap: var(--space-2); justify-content: center; margin-bottom: var(--space-4); }
.step-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-border-strong); transition: background var(--transition), transform var(--transition); }
.step-dot.is-active { background: var(--color-cinnabar); transform: scale(1.3); }
.step-dot.is-done { background: var(--color-jade); }

.vocab-teach-card {
  text-align: center;
  padding: var(--space-6) var(--space-4);
}
.vocab-teach-card .hanzi-huge { font-family: var(--font-hanzi); font-size: 3.5rem; line-height: 1; }
.vocab-teach-card .pinyin-lg { color: var(--color-cinnabar); font-size: var(--text-lg); margin-top: var(--space-2); }
.vocab-teach-card .meaning-lg { font-size: var(--text-base); color: var(--color-ink-soft); margin-top: var(--space-1); }
.char-breakdown { display: flex; justify-content: center; gap: var(--space-3); margin-top: var(--space-4); flex-wrap: wrap; }
.char-chip {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  min-width: 90px;
}
.char-chip .hanzi { font-size: var(--text-2xl); }
.char-chip .pinyin { font-size: var(--text-xs); color: var(--color-cinnabar); }
.char-chip .meta { font-size: var(--text-xs); color: var(--color-ink-soft); margin-top: 2px; }

.example-card { text-align: center; padding: var(--space-5) var(--space-4); }
.example-card .hanzi { font-size: var(--text-2xl); }
.example-card .pinyin { color: var(--color-cinnabar); margin-top: var(--space-2); }
.example-card .translation { margin-top: var(--space-3); font-style: italic; color: var(--color-ink-soft); }

.grammar-pattern { display: flex; justify-content: center; gap: var(--space-2); flex-wrap: wrap; margin: var(--space-5) 0; }
.grammar-part { text-align: center; padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-sm); background: var(--color-ivory); }
.grammar-part .hanzi { font-size: var(--text-xl); }
.grammar-part .role { font-size: var(--text-xs); color: var(--color-jade); text-transform: lowercase; margin-top: 2px; }
.grammar-part .meaning { font-size: var(--text-xs); color: var(--color-ink-soft); }
.grammar-plus { align-self: center; color: var(--color-border-strong); font-size: var(--text-xl); }

/* Fixed outside the sliding card — never animates with the page-turn. */
.step-nav { display: flex; justify-content: space-between; margin-top: var(--space-5); }

/* --- Book-style page turn (swipe on touch devices) --- */
.step-book {
  perspective: 1600px;
  /* Caps the card's height so the nav below it stays in place without
     needing to scroll the page; long content scrolls inside the card. */
  max-height: min(56vh, 460px);
  display: flex;
}
#step-content {
  width: 100%;
  overflow-y: auto;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  will-change: transform, opacity;
}
#step-content.is-dragging { transition: none !important; }
#step-content > .card { min-height: 100%; }

@keyframes pageOutFwd { from { transform: rotateY(0deg); opacity: 1; } to { transform: rotateY(-100deg); opacity: 0; } }
@keyframes pageInFwd  { from { transform: rotateY(90deg);  opacity: 0; } to { transform: rotateY(0deg);   opacity: 1; } }
@keyframes pageOutBwd { from { transform: rotateY(0deg); opacity: 1; } to { transform: rotateY(100deg);  opacity: 0; } }
@keyframes pageInBwd  { from { transform: rotateY(-90deg); opacity: 0; } to { transform: rotateY(0deg);   opacity: 1; } }

.page-out-fwd { animation: pageOutFwd 0.32s ease-in forwards; transform-origin: left center; }
.page-in-fwd  { animation: pageInFwd 0.32s ease-out forwards; transform-origin: left center; }
.page-out-bwd { animation: pageOutBwd 0.32s ease-in forwards; transform-origin: right center; }
.page-in-bwd  { animation: pageInBwd 0.32s ease-out forwards; transform-origin: right center; }

@media (prefers-reduced-motion: reduce) {
  .page-out-fwd, .page-in-fwd, .page-out-bwd, .page-in-bwd { animation: none; }
}

/* --- Quiz / practice --- */
.quiz-card { padding: var(--space-5); }
.quiz-question { font-size: var(--text-xl); margin-bottom: var(--space-5); text-align: center; }
.quiz-question .hanzi { font-size: var(--text-2xl); }
.quiz-options { display: grid; gap: var(--space-3); }
.quiz-option {
  text-align: left;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-strong);
  background: var(--color-ivory-raised);
  cursor: pointer;
  font-size: var(--text-base);
  transition: all var(--transition);
}
.quiz-option:hover { border-color: var(--color-ink); }
.quiz-option.is-correct { border-color: var(--color-jade); background: var(--color-jade-soft); }
.quiz-option.is-wrong { border-color: var(--color-cinnabar); background: #F6E4E3; }
.quiz-option[disabled] { cursor: default; }
.quiz-feedback { margin-top: var(--space-4); font-weight: 600; text-align: center; }
.quiz-feedback.correct { color: var(--color-jade); }
.quiz-feedback.wrong { color: var(--color-cinnabar); }
.quiz-summary { text-align: center; padding: var(--space-7) var(--space-5); }
.quiz-summary .score { font-family: var(--font-display); font-size: var(--text-4xl); color: var(--color-cinnabar); }

/* --- Badges / achievements --- */
.badge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: var(--space-4); }
.badge-item { text-align: center; padding: var(--space-4); border-radius: var(--radius-md); border: 1px solid var(--color-border); }
.badge-item .icon { font-size: var(--text-2xl); margin-bottom: var(--space-2); }
.badge-item .name { font-weight: 600; font-size: var(--text-sm); }
.badge-item .desc { font-size: var(--text-xs); color: var(--color-ink-soft); }
.badge-item.is-locked { opacity: 0.4; }

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  margin-top: var(--space-8);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* --- Empty state --- */
.empty-state { text-align: center; padding: var(--space-7); color: var(--color-ink-soft); }

/* ==========================================================================
   Characters page — stroke order + draw-here
   ========================================================================== */
.char-page-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: var(--space-3);
}
.char-tile {
  text-align: center;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-ivory-raised);
  cursor: pointer;
  transition: border-color var(--transition), transform var(--transition);
}
.char-tile:hover { border-color: var(--color-gold); transform: translateY(-2px); }
.char-tile .hanzi { font-family: var(--font-hanzi); font-size: var(--text-2xl); }
.char-tile .pinyin { font-size: var(--text-xs); color: var(--color-cinnabar); margin-top: 2px; }
.char-tile .meta { font-size: var(--text-xs); color: var(--color-ink-soft); }

/* SVG stroke-order renderer (see js/strokes.js) */
.stroke-svg { display: block; margin: 0 auto; }
.stroke-grid-bg { fill: var(--color-ivory); stroke: var(--color-border); stroke-width: 2; }
.stroke-grid-line { stroke: var(--color-border); stroke-width: 2; stroke-dasharray: 10 10; }
.stroke-path {
  fill: var(--color-ink);
  opacity: 0;
  transition: opacity 220ms ease;
}
.stroke-path.is-visible { opacity: 1; }
.stroke-path-guide { fill: var(--color-ink); opacity: 0.08 !important; transition: none; }
.stroke-num { opacity: 0; transition: opacity 220ms ease; }
.stroke-num.is-visible { opacity: 1; }
.stroke-num circle { fill: var(--color-cinnabar); }
.stroke-num text { fill: var(--color-ivory-raised); font-size: 20px; font-family: var(--font-body); font-weight: 700; }

.stroke-player { text-align: center; }
.stroke-controls { display: flex; justify-content: center; gap: var(--space-2); margin-top: var(--space-4); flex-wrap: wrap; }

.draw-canvas-wrap { position: relative; width: 220px; height: 220px; margin: 0 auto; }

/* --- Practice writing: correct/wrong banner (sits BELOW the canvas, never
   overlapping the hanzi being traced) --- */
.write-check-popup {
  min-height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--space-3);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 180ms ease, transform 180ms ease;
  pointer-events: none;
}
.write-check-popup.is-visible { opacity: 1; transform: translateY(0); }
.write-check-card {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: 999px;
  background: var(--color-ivory-raised);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-raised);
  white-space: nowrap;
}
.write-check-icon {
  font-size: 0.95rem;
  line-height: 1;
  width: 1.6rem;
  height: 1.6rem;
  flex-shrink: 0;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.write-check-card.is-correct .write-check-icon { color: var(--color-jade); background: var(--color-jade-soft); }
.write-check-card.is-wrong .write-check-icon { color: var(--color-cinnabar); background: #F6E4E3; }
.write-check-label { font-weight: 600; font-size: var(--text-sm); }
.write-check-card.is-correct .write-check-label { color: var(--color-jade); }
.write-check-card.is-wrong .write-check-label { color: var(--color-cinnabar); }
.write-check-score { font-size: var(--text-xs); color: var(--color-ink-soft); }
.draw-canvas {
  width: 220px;
  height: 220px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-strong);
  background: var(--color-ivory-raised);
  touch-action: none;
  cursor: crosshair;
}

.char-detail-header { display: flex; gap: var(--space-6); flex-wrap: wrap; justify-content: center; }
.char-detail-meta { text-align: left; min-width: 200px; }
.char-detail-meta .hanzi { font-size: var(--text-4xl); }
.char-detail-meta .pinyin { font-size: var(--text-lg); }
.char-word-list { display: flex; flex-direction: column; gap: var(--space-2); margin-top: var(--space-3); }
.char-word-list a {
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  font-size: var(--text-sm);
  transition: border-color var(--transition);
}
.char-word-list a:hover { border-color: var(--color-gold); }