/* ===== Generator page — sticky header + left preview + right card panel ===== */
.gen-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--color-bg);
  background-image:
    linear-gradient(var(--color-line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-line-soft) 1px, transparent 1px);
  background-size: 60px 60px;
  background-position: -1px -1px;
  padding-top: 64px; /* room for sticky topbar */
  padding-bottom: 48px;
}

/* Holds preview + panel in one centered row */
.gen-layout {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 0;
  width: 100%;
}

/* ===== Topbar (sticky) ===== */
.gen-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: rgba(250, 248, 243, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--color-line);
}
.gen-topbar__left {
  display: flex;
  align-items: center;
  gap: 18px;
}
.gen-topbar__back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-ink-soft);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  transition: background 0.18s, color 0.18s;
}
.gen-topbar__back:hover { background: var(--color-bg-soft); color: var(--color-ink); }
.gen-topbar__brand {
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--color-ink);
  letter-spacing: 0.04em;
}
@media (max-width: 768px) {
  .gen-topbar { padding: 0 16px; }
  .gen-topbar__brand { display: none; }
}

/* ===== Preview area =====
 *
 * Bottom padding is intentionally small — the .gen-disclaimer below
 * uses its own margin-top to control the gap to the paper. The old
 * padding-bottom: 64px was a visual buffer when .gen-preview was the
 * last element; with the disclaimer now below it, that padding
 * became dead space that pushed the disclaimer visually far away.
 */
.gen-preview {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 32px 12px 0;
  flex: 0 0 auto;
  max-width: none;
}
.gen-preview__inner {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}
.gen-preview__paper {
  background: var(--color-paper);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-line);
  /* width/height are set inline by GridRenderer to A4 physical size
     (210mm × 297mm), so screen preview matches print 1:1. */
}
.gen-sheet__footer {
  margin-top: auto;
  padding-top: 6px;
  text-align: center;
  font-size: 11px;
  color: var(--color-ink-mute);
  letter-spacing: 0.1em;
}

/* ===== Right panel (card) =====
 *
 * Sticky so it stays in view while the user scrolls through a multi-page
 * copybook on the left. top:64px == .gen-page's padding-top, so at rest
 * the panel doesn't jump. padding-top:32px matches .gen-preview's 32px so
 * the card's top edge lines up with the first A4 sheet's top edge.
 * If the panel is taller than the viewport it scrolls internally.
 */
.gen-panel {
  padding: 32px 24px;
  position: sticky;
  top: 64px;
  align-self: flex-start;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
}
.gen-panel__card {
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.gen-panel__title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-ink);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line-soft);
}

.gen-panel__top {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.gen-btn-action {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 14px;
  border-radius: var(--radius-md);
  font-size: 13px;
  letter-spacing: 0.05em;
  transition: background 0.2s, color 0.2s, transform 0.2s var(--ease-out), border-color 0.2s;
  border: 1px solid var(--color-line);
  font-weight: 500;
}
.gen-btn-action--compact { padding: 7px 14px; font-size: 13px; }
.gen-btn-action--ghost { background: var(--color-paper); color: var(--color-ink-soft); }
.gen-btn-action--ghost:hover { background: var(--color-bg-soft); color: var(--color-ink); border-color: var(--color-ink-mute); }
.gen-btn-action--primary { background: var(--color-ink); color: #fff; border-color: var(--color-ink); }
.gen-btn-action--primary:hover { background: var(--color-accent-deep); border-color: var(--color-accent-deep); }

/* ===== Text preview card ===== */
.gen-panel__text-card {
  background: var(--color-bg-soft);
  border: 1px dashed var(--color-line);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 16px;
  cursor: pointer;
  min-height: 56px;
  display: flex;
  align-items: center;
  transition: background 0.2s, border-color 0.2s;
}
.gen-panel__text-card:hover { background: var(--color-paper); border-color: var(--color-ink-mute); }
.gen-panel__text-content {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.15em;
  color: var(--color-ink);
  width: 100%;
  word-break: break-all;
  line-height: 1.4;
  /* Cap the preview so a 1000-char input can't blow up the panel's
     intrinsic height. The script writes a truncated string with a
     "…共 N 字" suffix, so the ellipsis here only matters for the
     middle of a single long line. */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}
.gen-panel__text-content.is-shrunk { color: var(--color-ink-soft); }
.gen-panel__text-suffix { color: var(--color-ink-mute); font-size: 12px; letter-spacing: 0.05em; margin-left: 4px; }
.gen-panel__text-content.is-empty {
  color: var(--color-ink-mute);
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.05em;
}
.gen-panel__text-content.is-empty::before { content: '点击输入要练习的汉字'; }

/* Non-hanzi input notice (字帖仅支持汉字) */
.gen-panel__hint {
  margin: -10px 0 16px;
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 1.4;
  color: var(--color-accent-deep);
}

/* ===== Field row ===== */
.gen-field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 10px 0;
  border-bottom: 1px solid var(--color-line-soft);
}
.gen-field:last-child { border-bottom: 0; }
.gen-field__label {
  font-size: 13px;
  color: var(--color-ink-soft);
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.gen-field__control {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
  justify-content: flex-end;
}

/* ===== Toggle switch ===== */
.gen-toggle {
  width: 36px;
  height: 20px;
  background: var(--color-line);
  border-radius: 999px;
  position: relative;
  cursor: pointer;
  transition: background 0.25s;
  flex-shrink: 0;
  outline: none;
}
.gen-toggle::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: left 0.25s var(--ease-out);
  box-shadow: 0 1px 2px rgba(0,0,0,0.15);
}
.gen-toggle.is-on { background: var(--color-ink); }
.gen-toggle.is-on::after { left: 18px; }

/* ===== Select dropdown ===== */
.gen-select {
  position: relative;
  min-width: 130px;
}
.gen-select__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--color-ink);
  transition: border-color 0.2s, background 0.2s;
}
.gen-select__trigger:hover { border-color: var(--color-ink-mute); }
.gen-select.is-open .gen-select__trigger { border-color: var(--color-ink); }
.gen-select__caret { font-size: 10px; opacity: 0.6; margin-left: 6px; }
.gen-select__menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 100%;
  max-height: 260px;
  overflow-y: auto;
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 4px;
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.15s, transform 0.15s var(--ease-out), visibility 0.15s;
}
.gen-select.is-open .gen-select__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.gen-select__item {
  padding: 8px 10px;
  font-size: 13px;
  color: var(--color-ink-soft);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  transition: background 0.12s, color 0.12s;
}
.gen-select__item:hover { background: var(--color-bg-soft); color: var(--color-ink); }
.gen-select__item.is-active { color: var(--color-accent); background: var(--color-accent-soft); }
.gen-select__item .check { opacity: 0; font-size: 11px; }
.gen-select__item.is-active .check { opacity: 1; }
.gen-select__divider {
  height: 1px;
  background: var(--color-line);
  margin: 4px 0;
}
.gen-select__upload-item { cursor: pointer; }
.gen-select__upload-item input[type=file] {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
  display: block !important;
}
.gen-select__upload-hint { font-size: 11px; color: var(--color-ink-mute); }

/* ===== Slider ===== */
.gen-slider {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
}
.gen-slider__input {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 2px;
  background: var(--color-line);
  border-radius: 1px;
  outline: none;
}
.gen-slider__input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--color-ink);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px var(--color-ink);
  transition: transform 0.15s;
}
.gen-slider__input::-webkit-slider-thumb:hover { transform: scale(1.15); }
.gen-slider__input::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--color-ink);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px var(--color-ink);
}
.gen-slider__value {
  font-size: 12px;
  color: var(--color-ink-mute);
  min-width: 44px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ===== Margin text input ===== */
.gen-margin-input {
  width: 100%;
  max-width: 160px;
  padding: 6px 10px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-family: 'SF Mono', Menlo, monospace;
  color: var(--color-ink);
  text-align: center;
  background: var(--color-paper);
  transition: border-color 0.2s;
}
.gen-margin-input:focus { outline: none; border-color: var(--color-ink); }

/* ===== Color picker ===== */
.gen-color {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--color-line);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}
.gen-color:hover { border-color: var(--color-ink-mute); transform: scale(1.05); }
.gen-color input[type=color] {
  position: absolute;
  inset: -4px;
  border: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
  width: calc(100% + 8px);
  height: calc(100% + 8px);
}

/* ===== Disclaimer (shown only for non-kai fonts) =====
 *
 * Sits at the page level, directly below the preview+panel row,
 * centered like the paper. Lives outside .gen-panel so the panel
 * layout never has to absorb it.
 */
.gen-disclaimer {
  width: min(1080px, 100%);
  margin: 8px 12px 0;
  padding: var(--space-3) var(--space-4);
  background: #fafafa;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-size: 12px;
  line-height: 1.7;
  color: var(--color-ink-soft);
  text-align: left;
}
.gen-disclaimer[hidden] { display: none; }
.gen-disclaimer__title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-ink);
  margin: 0 0 6px 0;
}
.gen-disclaimer p {
  margin: 0 0 4px 0;
}
.gen-disclaimer p:last-child { margin-bottom: 0; }

/* ===== Modal ===== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 26, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: var(--space-4);
  opacity: 0;
}
.modal.is-open { display: flex; }
.modal__panel {
  background: var(--color-paper);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
}
.modal__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}
.modal__title {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.08em;
  color: var(--color-ink);
}
.modal__close {
  font-size: 24px;
  color: var(--color-ink-mute);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
}
.modal__close:hover { background: var(--color-bg-soft); color: var(--color-ink); }
.modal__desc {
  font-size: 13px;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-3);
  line-height: 1.6;
}
.modal__presets {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.modal__preset {
  padding: 6px 14px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: var(--color-bg-soft);
  color: var(--color-ink-soft);
  font-size: 13px;
  font-family: var(--font-display);
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background 0.18s, color 0.18s, border-color 0.18s;
}
.modal__preset:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-accent-deep);
}
.modal__textarea {
  width: 100%;
  min-height: 120px;
  padding: var(--space-3);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.1em;
  color: var(--color-ink);
  background: var(--color-bg);
  resize: vertical;
  transition: border-color 0.2s;
}
.modal__textarea:focus { outline: none; border-color: var(--color-ink); }
.modal__actions {
  display: flex;
  gap: var(--space-2);
  justify-content: flex-end;
  margin-top: var(--space-4);
}
.modal__btn {
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 13px;
  letter-spacing: 0.05em;
  transition: background 0.2s, color 0.2s;
}
.modal__btn--ghost { background: var(--color-bg-soft); color: var(--color-ink-soft); }
.modal__btn--ghost:hover { background: var(--color-line); color: var(--color-ink); }
.modal__btn--primary { background: var(--color-ink); color: #fff; }
.modal__btn--primary:hover { background: var(--color-accent-deep); }

/* ===== Print: only the copybook paper =====
 *
 * The paper's width/height are set in the base .gen-preview__paper
 * rule (210mm × 297mm) so screen preview and print output are 1:1.
 * Here we just strip the on-screen chrome.
 */
@media print {
  .gen-topbar,
  .gen-panel,
  .modal,
  .gen-disclaimer,
  .gen-fab,
  .gen-panel__backdrop,
  #__stroke_canvas__ {
    display: none !important;
  }

  html, body, .gen-page {
    background: #fff !important;
    background-image: none !important;
  }

  .gen-page { display: block; padding: 0 !important; }
  .gen-preview { padding: 0 !important; min-height: auto; flex: 0 0 auto; max-width: none; }
  .gen-preview__inner { display: block; gap: 0; }
  .gen-preview__paper {
    box-shadow: none;
    border: 0;
    border-radius: 0;
    margin: 0;
    /* Each sheet = one A4 page; force a page break after every
       sheet except the last so multi-page copybooks paginate cleanly. */
    page-break-after: always;
  }
  .gen-preview__paper:last-child { page-break-after: auto; }

  @page { margin: 0; size: A4 portrait; }
}

/* Disabled field (e.g. 显示笔顺 in vertical mode, where it has no effect) */
.gen-field.is-disabled {
  opacity: 0.4;
  pointer-events: none;
}

/* ===== Mobile drawer affordances (hidden on desktop) ===== */
.gen-fab,
.gen-panel__backdrop { display: none; }

/* ===== Responsive =====
 *
 * Below 1024px the two-column layout can't fit the 210mm-wide A4 sheet
 * beside the panel, so the panel becomes an off-canvas drawer toggled by
 * a floating button. The preview takes the full width and scrolls
 * horizontally if the sheet is wider than the viewport.
 */
@media (max-width: 1024px) {
  .gen-layout { display: block; }
  .gen-preview {
    padding: 20px 12px 0;
    min-height: auto;
    overflow-x: auto;
    justify-content: flex-start;
  }
  .gen-preview__inner {
    width: max-content;
    min-width: 100%;
    align-items: flex-start;
  }

  /* Panel → right-side drawer */
  .gen-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: auto;
    width: min(360px, 88vw);
    max-height: none;
    padding: 72px 16px 32px;
    background: var(--color-bg);
    box-shadow: -12px 0 32px rgba(26, 26, 26, 0.18);
    transform: translateX(100%);
    transition: transform 0.28s var(--ease-out);
    z-index: 60;
  }
  .gen-panel.is-open { transform: translateX(0); }

  .gen-panel__backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(26, 26, 26, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.28s var(--ease-out);
    z-index: 59;
  }
  .gen-panel__backdrop.is-open { opacity: 1; pointer-events: auto; }

  /* Floating toggle button */
  .gen-fab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    position: fixed;
    right: 16px;
    bottom: 16px;
    z-index: 55;
    padding: 12px 20px;
    border-radius: 999px;
    background: var(--color-ink);
    color: #fff;
    font-size: 14px;
    letter-spacing: 0.05em;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
  }
  .gen-fab:active { transform: scale(0.96); }
}

@media (max-width: 768px) {
  .gen-page { padding-top: 56px; }
}