:root {
  --writing-kanji-modal-max-width: 460px;
  --writing-kanji-modal-padding: calc(var(--modal-close-size) + 0.6em) 0.9em
    0.9em;
  --writing-kanji-canvas-size: min(72vw, 52dvh, 420px);
  --writing-kanji-title-size: 1.5rem;
  --writing-kanji-subtitle-size: 1.3rem;
  --writing-kanji-message-size: 0.82rem;
  --writing-message-success: #16a34a;
  --writing-message-error: #b91c1c;
  --writing-kanji-mnemonic-pill-size: 42px;
  --writing-kanji-mnemonic-font-size: 0.88rem;
}

.dark-mode {
  --writing-message-success: #50fa7b;
  --writing-message-error: #ff6e6e;
}

#writing-kanji-svg-host {
  z-index: var(--z-index-writing-kanji-svg-layer);
  width: 100%;
  height: 100%;
  min-width: 100%;
  min-height: 100%;
  position: relative;
}

#writing-kanji-svg-host svg {
  z-index: var(--z-index-writing-kanji-svg-layer);
  width: 100%;
  height: 100%;
  display: block;
}

/*
 * The canvas must remain above the SVG kanji layer.
 *
 * The SVG host renders the static kanji outline and guide graphics, while
 * the canvas receives all pointer/touch input and user-drawn strokes.
 *
 * Without an explicit z-index, some browsers can place the SVG above the
 * canvas in the stacking order, causing drawing interactions to stop
 * working even though the canvas remains visible.
 *
 * Layer order:
 *
 *   1. #writing-kanji-svg-host      (kanji background / guides)
 *   2. .writing-kanji-canvas        (user drawing surface)
 *   3. #writing-kanji-dots-overlay  (start/end tracing markers)
 */
.writing-kanji-canvas {
  z-index: var(--z-index-writing-kanji-canvas-layer);
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border-radius: var(--border-radius-medium);
  cursor: crosshair;

  /* Prevents browser scrolling so pointermove can fire */
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

#writing-kanji-dots-overlay {
  z-index: var(--z-index-writing-kanji-dots-layer);
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.writing-kanji-modal {
  position: relative;
  width: 100%;
  max-width: var(--writing-kanji-modal-max-width);
  padding: var(--writing-kanji-modal-padding);
  display: flex;
  flex-direction: column;
  align-items: center;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

.writing-kanji-close {
  position: absolute;
  top: 0.55em;
  right: 0.55em;
  z-index: 2;
}

/* In stacked layouts, unwrap the side panel so header/canvas/buttons can be ordered cleanly. */
.writing-kanji-side-panel {
  display: contents;
}

.writing-kanji-header {
  order: 1;
  width: min(100%, var(--writing-kanji-canvas-size));
  margin: 0 0 0.75em;
  padding-right: 0;
  line-height: 1.5;
  text-align: center;
}

.writing-kanji-title {
  color: var(--color-light-theme-text-default);
  font-size: var(--writing-kanji-title-size);
  font-weight: 700;
  margin-bottom: 0.3em;
  text-align: left;
}

.writing-kanji-subtitle {
  color: #666;
  font-size: var(--writing-kanji-subtitle-size);
  font-weight: 600;
}

.dark-mode .writing-kanji-title {
  color: var(--color-dark-theme-text-default);
}

.dark-mode .writing-kanji-subtitle {
  color: var(--color-dark-theme-text-muted);
}

/*
 * Creates an isolated stacking context so the kanji SVG, drawing canvas,
 * and tracing-dot overlay maintain a predictable z-index ordering.
 */
.writing-kanji-svg-container {
  order: 2;
  contain: layout paint;
  position: relative;
  isolation: isolate;
  width: var(--writing-kanji-canvas-size);
  height: var(--writing-kanji-canvas-size);
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background-color: var(--color-light-theme-sunken);
  border-radius: var(--border-radius-medium);
  border: var(--border-thin-light-theme);
}

.dark-mode .writing-kanji-svg-container {
  background-color: var(--color-dark-theme-background-default);
  border: var(--border-thin-dark-theme);
}

.writing-kanji-controls {
  order: 3;
  display: flex;
  justify-content: center;
  gap: 0.6em;
  width: min(100%, var(--writing-kanji-canvas-size));
  margin-top: 0.75em;
}

.writing-kanji-controls button:focus-visible {
  outline: none;
}

.writing-kanji-controls > * {
  flex: 1 1 0;
  min-width: 0;
}

.writing-kanji-controls button {
  width: 100%;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
}

/* Hidden mnemonic button takes no space; no wrapper div needed. */
.writing-kanji-mnemonic-btn[hidden] {
  display: none;
}

.writing-kanji-guide-btn:disabled {
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

.writing-kanji-message {
  order: 4;
  width: min(100%, var(--writing-kanji-canvas-size));
  text-align: center;
  min-height: 1.4em;
  font-size: var(--writing-kanji-message-size);
  font-family: inherit;
  font-weight: 600;
  margin: 0.75em 0 0;
  line-height: 1.35;
  transition: none;
}

.writing-kanji-message[data-type="success"] {
  color: var(--writing-message-success);
}

.writing-kanji-message[data-type="error"] {
  color: var(--writing-message-error);
}

.writing-kanji-mnemonic-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  padding: 0.45em 1em;
  font: inherit;
  font-size: var(--writing-kanji-mnemonic-font-size);
  font-weight: 600;
  color: var(--color-light-theme-accent);
  background: transparent;
  border: var(--border-thin-accent-light-theme);
  border-radius: var(--border-radius-medium);
  cursor: pointer;
  appearance: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.dark-mode .writing-kanji-mnemonic-btn {
  color: var(--modal-button-color-dark);
  border: var(--border-thin-dark-theme);
}

.writing-kanji-mnemonic-pill.kanji-pill {
  width: 100%;
  min-width: 0;
  height: 32px;
  min-height: 32px;
  padding: 0;
  flex: 0 0 auto;
  color: var(--modal-button-color-light);
  border: none;
  background-color: var(--color-light-theme-surface);
}

.dark-mode .writing-kanji-mnemonic-pill.kanji-pill {
  border: none;
  background: var(--color-dark-theme-background-base);
}

.dark-mode .writing-kanji-mnemonic-pill .kanji-pill-glyph {
  color: var(--modal-button-color-dark);
}

.writing-kanji-mnemonic-pill .kanji-pill-glyph {
  font-size: calc(var(--writing-kanji-mnemonic-pill-size) * 0.52);
  color: var(--color-light-theme-accent);
}

.writing-kanji-mnemonic-btn .writing-kanji-mnemonic-pill.kanji-pill {
  pointer-events: none;
  background: transparent;
}

.writing-kanji-mnemonic-text {
  min-width: 0;
  line-height: 1.2;
  white-space: nowrap;
}

.writing-kanji-mnemonic-btn:focus-visible {
  outline: 2px solid var(--color-light-theme-accent);
  outline-offset: 2px;
}

.dark-mode .writing-kanji-mnemonic-btn:focus-visible {
  outline-color: var(--color-dark-theme-accent);
}

.writing-kanji-mnemonic-btn:active {
  background: rgb(0 0 0 / 6%);
}

.dark-mode .writing-kanji-mnemonic-btn:active {
  background: rgb(255 255 255 / 8%);
}

@media (hover: hover) {
  .writing-kanji-mnemonic-btn:hover {
    background: rgb(0 0 0 / 5%);
  }

  .dark-mode .writing-kanji-mnemonic-btn:hover {
    background: rgb(255 255 255 / 6%);
  }
}

/* Mobile portrait */
@media (max-width: 768px) and (orientation: portrait) {
  :root {
    --writing-kanji-modal-max-width: 92vw;
    --writing-kanji-modal-padding: calc(var(--modal-close-size) + 0.55em) 0.85em
      0.85em;
    --writing-kanji-canvas-size: min(76vw, 50dvh);
    --writing-kanji-title-size: 0.9rem;
    --writing-kanji-subtitle-size: 0.9rem;
    --writing-kanji-message-size: 1rem;
    --writing-kanji-mnemonic-pill-size: 38px;
    --writing-kanji-mnemonic-font-size: 0.82rem;
  }

  .writing-kanji-overlay {
    padding: calc(env(safe-area-inset-top) + 12px) 10px
      calc(env(safe-area-inset-bottom) + 12px);
  }
}

/* Mobile landscape */
@media (max-height: 768px) and (orientation: landscape) {
  :root {
    --writing-kanji-modal-max-width: min(90vw, 920px);
    --writing-kanji-modal-padding: 0.75em;
    --writing-kanji-canvas-size: min(64dvh, 38vw);
    --writing-kanji-title-size: 1.1rem;
    --writing-kanji-subtitle-size: 1.1rem;
    --writing-kanji-message-size: 1rem;
    --writing-kanji-mnemonic-pill-size: 44px;
    --writing-kanji-mnemonic-font-size: 0.78rem;
  }

  .writing-kanji-overlay {
    align-items: center;
    padding: calc(env(safe-area-inset-top) + 8px) 10px
      calc(env(safe-area-inset-bottom) + 8px);
  }

  .writing-kanji-modal {
    width: auto;
    max-width: var(--writing-kanji-modal-max-width);
    display: grid;
    grid-template-columns: var(--writing-kanji-canvas-size) minmax(220px, 1fr);
    grid-template-rows: auto auto;
    gap: 0.85em 1em;
    align-items: start;
  }

  .writing-kanji-svg-container {
    grid-column: 1;
    grid-row: 1;
  }

  .writing-kanji-side-panel {
    grid-column: 2;
    grid-row: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    padding-top: calc(var(--modal-close-size) + 0.35em);
  }

  .writing-kanji-header {
    width: 100%;
    margin: 0;
    text-align: left;
  }

  .writing-kanji-subtitle {
    text-align: left;
  }

  .writing-kanji-message {
    width: 100%;
    margin-top: 0.75em;
  }

  .writing-kanji-controls {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    margin: 0;
  }
}

/* Desktop */
@media (min-width: 1025px) {
  :root {
    --writing-kanji-modal-max-width: 560px;
    --writing-kanji-canvas-size: min(48vw, 58dvh, 430px);
  }
}