/* ── Tokens ─────────────────────────────────────────────────────────────────── */
:root {
  --red:        #cc3120;
  --red-hover:  #a82818;
  --rail-w:     52px;
  --panel-w:    268px;

  /* Light theme */
  --bg:         #f5f3ef;
  --surface:    #ffffff;
  --border:     #e4dfd6;
  --ink:        #111009;
  --ink2:       #5a534c;
  --ink3:       #9a948e;
  --rail-bg:    #111009;
  --rail-icon:  rgba(255,255,255,0.45);
  --rail-active:#ffffff;
  --rail-hover: rgba(255,255,255,0.12);
  --panel-bg:   #ffffff;
}

[data-theme="dark"] {
  --bg:         #1a1917;
  --surface:    #232220;
  --border:     #2e2c2a;
  --ink:        #f0ece4;
  --ink2:       #a09890;
  --ink3:       #6a6460;
  --panel-bg:   #1e1c1a;
}

/* ── Reset ───────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 400;
  background: var(--bg);
  color: var(--ink);
  height: 100vh;
  overflow: hidden;
}

svg { display: block; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

button { cursor: pointer; border: none; background: none; font-family: inherit; }
a { text-decoration: none; color: inherit; }

/* ── Layout ──────────────────────────────────────────────────────────────────── */
.layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ── Left rail ───────────────────────────────────────────────────────────────── */
.rail {
  width: var(--rail-w);
  background: var(--rail-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 0;
  gap: 2px;
  flex-shrink: 0;
  z-index: 10;
}

.rail-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  color: var(--rail-icon);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
  position: relative;
}
.rail-btn svg { width: 17px; height: 17px; }
.rail-btn:hover:not(:disabled) { background: var(--rail-hover); color: var(--rail-active); }
.rail-btn.active { color: var(--rail-active); }
.rail-btn:disabled { opacity: 0.25; cursor: default; }

.rail-sep {
  width: 28px;
  height: 1px;
  background: rgba(255,255,255,0.08);
  margin: 6px 0;
}

/* ── Center ──────────────────────────────────────────────────────────────────── */
.center {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-y: auto;
  padding: 28px 24px 60px;
  gap: 24px;
  min-width: 0;
}

/* ── Search bar ──────────────────────────────────────────────────────────────── */
.search-bar {
  width: 100%;
  max-width: 520px;
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 6px 6px 6px 14px;
  gap: 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  transition: border-color 0.15s, box-shadow 0.15s;
  flex-shrink: 0;
}
.search-bar:focus-within {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(204,49,32,0.12);
}

.search-cn-hint {
  font-family: 'Noto Serif SC', serif;
  font-size: 22px;
  color: var(--red);
  line-height: 1;
  flex-shrink: 0;
  user-select: none;
  transition: opacity 0.2s;
}

.search-input {
  flex: 1;
  font-size: 20px;
  border: none;
  outline: none;
  background: transparent;
  color: var(--ink);
  min-width: 0;
  font-family: 'Noto Serif SC', serif;
}
.search-input::placeholder {
  font-family: 'DM Sans', sans-serif;
  font-size: 14px;
  color: var(--ink3);
}

.search-btn {
  width: 38px;
  height: 38px;
  background: var(--red);
  border-radius: 8px;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s;
}
.search-btn:hover { background: var(--red-hover); }
.search-btn svg { width: 16px; height: 16px; }

/* ── Empty / Error ───────────────────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 60px 20px;
  color: var(--ink3);
}
.empty-char {
  font-family: 'Noto Serif SC', serif;
  font-size: 72px;
  color: var(--border);
  line-height: 1;
}
.empty-state p { font-size: 14px; }

.error-state {
  background: #fdecea;
  color: var(--red);
  border: 1px solid rgba(204,49,32,0.2);
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 14px;
  max-width: 400px;
  text-align: center;
}
[data-theme="dark"] .error-state {
  background: rgba(204,49,32,0.12);
  border-color: rgba(204,49,32,0.3);
}

/* ── Animation area ──────────────────────────────────────────────────────────── */
.anim-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: 440px;
}

.anim-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.anim-char {
  font-family: 'Noto Serif SC', serif;
  font-size: 32px;
  color: var(--ink);
  line-height: 1;
}
.stroke-counter {
  font-size: 13px;
  color: var(--ink3);
  font-weight: 500;
}

.writer-target {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 8px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.writer-target svg {
  border-radius: 8px;
  display: block;
}

/* ── Draw area (site) ────────────────────────────────────────────────────────── */
.draw-area {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.draw-area-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.draw-canvas-wrap {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 1.5px solid var(--border);
  background: var(--surface);
  width: 320px;
}
#siteCanvas {
  display: block;
  cursor: crosshair;
  touch-action: none;
  position: relative;
  z-index: 2;
  background: transparent;
}
.draw-grid {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px),
    linear-gradient(rgba(228,223,214,0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(228,223,214,0.5) 1px, transparent 1px);
  background-size: 160px 110px, 160px 110px, 80px 55px, 80px 55px;
  pointer-events: none;
}
.draw-grid::before, .draw-grid::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to bottom right, var(--border) 0.5px, transparent 0.5px),
    linear-gradient(to bottom left, var(--border) 0.5px, transparent 0.5px);
  background-size: 320px 220px;
  pointer-events: none;
}
.draw-clear {
  position: absolute;
  top: 7px;
  right: 7px;
  z-index: 3;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(0,0,0,0.07);
  color: var(--ink2);
  font-size: 11px;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.12s;
}
.draw-clear:hover { background: rgba(0,0,0,0.14); }
.draw-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.draw-recognize-btn {
  padding: 7px 18px;
  background: var(--ink);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s;
}
.draw-recognize-btn:hover { background: #2a2820; }
.draw-recognize-btn:disabled { opacity: 0.4; cursor: default; }
[data-theme="dark"] .draw-recognize-btn { background: var(--ink); }
.draw-status { font-size: 12px; color: var(--ink3); }
.draw-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}
.draw-sug-btn {
  width: 48px;
  height: 48px;
  font-family: 'Noto Serif SC', serif;
  font-size: 24px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  cursor: pointer;
  color: var(--ink);
  transition: all 0.12s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.draw-sug-btn:hover {
  border-color: var(--red);
  background: #fff5f4;
  color: var(--red);
}

/* ── Practice mode ───────────────────────────────────────────────────────────── */
.practice-area {
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.practice-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.practice-title {
  font-size: 15px;
  color: var(--ink);
}
.practice-title strong {
  font-family: 'Noto Serif SC', serif;
  font-size: 20px;
  color: var(--red);
}
.practice-exit {
  font-size: 12px;
  color: var(--ink3);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background 0.15s;
}
.practice-exit:hover { background: var(--border); color: var(--ink2); }

.practice-hint {
  font-size: 13px;
  color: var(--ink3);
}

.practice-feedback {
  font-size: 14px;
  font-weight: 600;
  min-height: 22px;
  transition: color 0.2s;
}
.practice-feedback.correct { color: #2e7d32; }
.practice-feedback.wrong   { color: var(--red); }

.practice-score {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  width: 100%;
}
.score-icon { font-size: 36px; }
.score-text { font-size: 15px; font-weight: 600; color: var(--ink); }
.btn-retry {
  padding: 8px 24px;
  background: var(--red);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-retry:hover { background: var(--red-hover); }

/* ── Diagrams ────────────────────────────────────────────────────────────────── */
.diagrams-area {
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.diagrams-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.diagrams-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.diagram-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 8px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.diagram-label {
  font-size: 11px;
  color: var(--ink3);
  font-weight: 500;
}
.diagrams-loading { font-size: 12px; color: var(--ink3); padding: 4px 0; }
.diagrams-error { font-size: 12px; color: var(--red); }

/* ── Right panel ─────────────────────────────────────────────────────────────── */
.panel {
  width: var(--panel-w);
  background: var(--panel-bg);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  height: 100vh;
  overflow-y: auto;
  scrollbar-width: none;
}
.panel::-webkit-scrollbar { display: none; }

/* Theme toggle */
.panel-theme {
  display: flex;
  justify-content: flex-end;
  padding: 10px 12px 0;
}
.theme-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  color: var(--ink2);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.theme-btn:hover { background: var(--border); }

/* Panel body */
.panel-body {
  padding: 8px 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  flex: 1;
}

.panel-section { display: flex; flex-direction: column; gap: 8px; }

.panel-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--ink3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Segmented control */
.seg-ctrl {
  display: flex;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px;
  gap: 2px;
}
.seg-btn {
  flex: 1;
  padding: 5px 4px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink2);
  transition: background 0.15s, color 0.15s;
  text-align: center;
}
.seg-btn:hover:not(.active) { background: var(--border); }
.seg-btn.active {
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  font-weight: 600;
}

/* Char info */
.char-info {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.char-info-big {
  font-family: 'Noto Serif SC', serif;
  font-size: 40px;
  line-height: 1;
  color: var(--red);
}
.char-info-meta {
  font-size: 12px;
  color: var(--ink2);
  line-height: 1.6;
}

/* ── Panel footer ────────────────────────────────────────────────────────────── */
.panel-footer {
  padding: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-block { display: flex; flex-direction: column; gap: 6px; }

.footer-head {
  font-size: 11px;
  font-weight: 600;
  color: var(--ink3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--ink2);
  transition: color 0.15s;
}
.footer-link:hover { color: var(--red); }
.footer-link svg { width: 13px; height: 13px; flex-shrink: 0; }

/* Stars */
.footer-stars {
  display: flex;
  gap: 2px;
}
.star-btn {
  font-size: 20px;
  color: var(--border);
  transition: color 0.1s, transform 0.1s;
  line-height: 1;
}
.star-btn:hover, .star-btn.lit { color: #e8a020; }
.star-btn:hover { transform: scale(1.15); }

.footer-rate-label {
  font-size: 11px;
  color: var(--ink3);
  margin-top: 2px;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 5px;
}
.footer-tiny {
  font-size: 11px;
  color: var(--ink3);
  transition: color 0.15s;
}
a.footer-tiny:hover { color: var(--ink2); }
.footer-dot { font-size: 11px; color: var(--border); }

/* ── Draw label ──────────────────────────────────────────────────────────────── */
.draw-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--ink3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-align: center;
  margin-bottom: 4px;
}

/* ── Practice button (prominent) ────────────────────────────────────────────── */
.anim-actions {
  width: 100%;
  max-width: 440px;
  margin-top: 4px;
}
.btn-practice {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  width: 100%;
  padding: 13px 24px;
  background: var(--red);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, transform 0.12s, box-shadow 0.15s;
  box-shadow: 0 2px 8px rgba(204,49,32,0.30);
  letter-spacing: 0.01em;
}
.btn-practice:hover {
  background: var(--red-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(204,49,32,0.36);
}
.btn-practice:active { transform: translateY(0); box-shadow: none; }
.btn-practice svg { width: 16px; height: 16px; stroke: #fff; }

/* ── Print ───────────────────────────────────────────────────────────────────── */
@media print {
  html, body {
    height: auto !important;
    overflow: visible !important;
    background: #fff !important;
  }
  .layout {
    display: block !important;
    height: auto !important;
    overflow: visible !important;
  }
  .rail, .panel, .search-bar, .anim-area, .anim-actions,
  .empty-state, .error-state, .draw-area, .practice-area { display: none !important; }
  .center {
    display: block !important;
    overflow: visible !important;
    padding: 24px !important;
    height: auto !important;
    width: 100% !important;
  }
  .diagrams-area {
    display: block !important;
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }
  .diagrams-title { margin-bottom: 12px; font-size: 14px; }
  .diagrams-grid {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 10px !important;
  }
  .diagram-card {
    border: 1px solid #ccc !important;
    break-inside: avoid;
    page-break-inside: avoid;
  }
}

/* ── Print Worksheet Modal ───────────────────────────────────────────────────── */
.print-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.print-modal-bd {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(4px);
}
.print-modal-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  max-width: 740px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.22);
  max-height: 90vh;
  overflow-y: auto;
}
.print-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.print-modal-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  font-family: 'Noto Serif SC', serif;
}
.print-modal-close {
  width: 28px; height: 28px;
  border-radius: 6px;
  color: var(--ink3);
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s;
}
.print-modal-close:hover { background: var(--border); color: var(--ink); }
.print-modal-previews {
  display: flex;
  gap: 16px;
}
.print-preview-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  min-width: 0;
}
.print-preview-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--ink3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.print-preview-wrap {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
  position: relative;
}
.print-preview-frame {
  border: none;
  transform-origin: 0 0;
  display: block;
  pointer-events: none;
}
.print-sheet-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--ink);
  color: #fff;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  transition: background 0.15s;
  width: 100%;
}
.print-sheet-btn:hover { background: #2a2820; }
.print-sheet-btn svg { width: 14px; height: 14px; stroke: #fff; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
[data-theme="dark"] .print-sheet-btn:hover { background: #333; }

/* ── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  .panel { display: none; }
  .rail { width: 44px; }
  :root { --rail-w: 44px; }
}