* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #12151b;
  --bg-panel: #1a1f27;
  --bg-raised: #232a35;
  --border: #2e3745;
  --text: #e8ecf1;
  --text-dim: #93a0b0;
  --accent: #4da3ff;
  --accent-soft: rgba(77, 163, 255, 0.18);
  --warn: #ffaa3c;
  --radius: 10px;
}

html, body { height: 100%; }

/* Mobile browser chrome (address bar) makes 100% unreliable; dvh tracks it. */
@supports (height: 100dvh) {
  body { height: 100dvh; }
}

body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  overscroll-behavior: none;
}

/* ---------- Top bar ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 18px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}

.brand { display: flex; align-items: center; gap: 12px; }

.brand-logo {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  font-size: 20px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 9px;
}

.brand h1 { font-size: 17px; letter-spacing: 0.2px; }
.tagline { font-size: 12px; color: var(--text-dim); }

.topbar-controls { display: flex; align-items: center; gap: 14px; }

.engine-status {
  font-size: 12px;
  color: var(--warn);
}
.engine-status.ready { color: #62c98a; }

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 11px;
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: color 0.15s, border-color 0.15s;
}
.github-link:hover { color: var(--text); border-color: #3c4757; }

/* ---------- Controls ---------- */

.btn {
  background: var(--bg-raised);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 13px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.btn:hover:not(:disabled) { background: #2b3442; border-color: #3c4757; }
.btn:disabled { opacity: 0.45; cursor: default; }

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0b1622;
  font-weight: 600;
}
.btn.primary:hover:not(:disabled) { background: #6cb4ff; border-color: #6cb4ff; }

.btn.icon { font-size: 16px; padding: 6px 11px; }

.field { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; color: var(--text-dim); }

select {
  background: var(--bg-raised);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 8px;
  font-size: 13px;
}

/* ---------- Layout ---------- */

.layout {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 196px 1fr 300px;
  min-height: 0;
}

/* Mobile-only editor/preview segmented control. */
.view-toggle { display: none; }

/* ---------- Sidebar (pages) ---------- */

.sidebar {
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
}

.add-buttons { display: flex; flex-direction: column; gap: 8px; }
.add-btn {
  width: 100%;
  padding: 10px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
}
.add-btn .btn-icon { display: inline-flex; }
/* Camera capture is only meaningful on touch devices; shown via (pointer: coarse). */
.camera-btn { display: none; }

.pages-list {
  flex: 1 1 auto;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-item {
  position: relative;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-raised);
}
.page-item.selected { border-color: var(--accent); }
.page-item .thumb { display: block; width: 100%; height: auto; }

.page-item .page-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 7px;
  font-size: 11px;
  color: var(--text-dim);
}
.page-item .page-num { font-weight: 700; color: var(--text); }
.page-item .page-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1 1 auto;
  min-width: 0;
}
.page-item .badge {
  color: #1d1405;
  background: var(--warn);
  border-radius: 5px;
  padding: 1px 5px;
  font-weight: 600;
}
.page-item .spinner {
  width: 11px; height: 11px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.page-item .page-actions {
  position: absolute;
  top: 5px; right: 5px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.15s;
}
.page-item:hover .page-actions { opacity: 1; }
.page-actions button {
  width: 24px; height: 24px;
  display: grid; place-items: center;
  font-size: 12px;
  color: var(--text);
  background: rgba(10, 13, 18, 0.75);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
}
.page-actions button:hover { background: rgba(30, 38, 50, 0.95); }
.page-actions button:disabled { opacity: 0.35; cursor: default; }
.page-actions .del:hover { border-color: #c05050; color: #ff8f8f; }

/* ---------- Editor ---------- */

.editor-pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  flex-wrap: wrap;
}
.toolbar .sep { width: 1px; height: 22px; background: var(--border); }

.editor-wrap {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  overflow: hidden;
}

#editor-canvas {
  touch-action: none;
  border-radius: 6px;
  box-shadow: 0 6px 30px rgba(0, 0, 0, 0.45);
  cursor: crosshair;
}

.editor-hint {
  flex: 0 0 auto;
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
  padding: 0 14px 10px;
}

/* ---------- Dropzone ---------- */

.dropzone {
  cursor: pointer;
  width: min(560px, 90%);
  border: 2px dashed var(--border);
  border-radius: 14px;
  padding: 56px 32px;
  text-align: center;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone.dragover { border-color: var(--accent); background: var(--accent-soft); }
.dz-icon { font-size: 34px; color: var(--accent); margin-bottom: 12px; }
.dz-title { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.dz-sub { font-size: 13px; color: var(--text-dim); max-width: 400px; margin: 0 auto; }

/* ---------- Preview pane ---------- */

.preview-pane {
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 0;
}
.preview-pane h2 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--text-dim); }

.preview-wrap {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  place-items: center;
  background: #0d1015;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
  overflow: hidden;
}
#preview-canvas {
  max-width: 100%;
  max-height: 100%;
  border-radius: 3px;
  box-shadow: 0 3px 16px rgba(0, 0, 0, 0.5);
}
.preview-hint { font-size: 11px; color: var(--text-dim); text-align: center; }

/* ---------- Footer ---------- */

.footer {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 8px 18px;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
}

.footer-links { display: flex; gap: 16px; }
.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--accent); }

/* ---------- Export overlay ---------- */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(8, 10, 14, 0.72);
  display: grid;
  place-items: center;
  z-index: 50;
}
.overlay-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 26px 34px;
  min-width: 300px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.progress {
  height: 8px;
  background: var(--bg-raised);
  border-radius: 5px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: 5px;
  transition: width 0.2s;
}

/* ---------- Touch devices (phones and tablets, any width) ---------- */

@media (hover: none) {
  /* Hover-revealed page actions are unreachable on touch — keep them visible. */
  .page-item .page-actions { opacity: 1; }
  .page-actions button { width: 30px; height: 30px; font-size: 13px; }
  /* iOS Safari zooms into focused controls with font-size < 16px. */
  select { font-size: 16px; }
  .btn, select, .page-item { touch-action: manipulation; }
}

@media (pointer: coarse) {
  .camera-btn { display: inline-flex; }
}

/* ---------- Mobile layout (single-panel with editor/preview toggle) ---------- */

@media (max-width: 767px) {
  /* Top bar: compact enough for 320px-wide screens. */
  .topbar { padding: calc(8px + env(safe-area-inset-top)) 10px 8px; gap: 10px; }
  .tagline { display: none; }
  .brand { gap: 8px; }
  .brand-logo { width: 30px; height: 30px; font-size: 16px; }
  .brand h1 { font-size: 15px; }
  .topbar-controls { gap: 8px; }
  .engine-status { display: none; }
  .topbar .field > span { display: none; }
  /* The select sizes itself to the longest option ("Auto (fit sheet)"). */
  .topbar select { max-width: 84px; }
  .github-link { padding: 6px; }
  .github-link span { display: none; }

  .footer { display: none; }

  .layout { display: flex; flex-direction: column; }

  /* Sidebar becomes a horizontal thumbnail strip with add/camera tiles. */
  .sidebar {
    flex: 0 0 auto;
    flex-direction: row;
    gap: 8px;
    padding: 8px;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .add-buttons { gap: 6px; flex: 0 0 auto; }
  .add-buttons .btn { flex: 1 1 auto; width: 52px; padding: 0; font-size: 20px; }
  .add-buttons .btn-label { display: none; }
  .pages-list {
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    gap: 8px;
  }
  .page-item { flex: 0 0 100px; }
  .page-item .thumb { width: 100%; height: 64px; object-fit: cover; }
  .page-item .page-name { display: none; }
  .page-item .page-meta { padding: 4px 6px; }

  /* Editor/preview segmented control. */
  .view-toggle {
    display: flex;
    justify-content: center;
    padding: 8px;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border);
  }
  .view-toggle .seg {
    flex: 0 1 140px;
    padding: 8px 0;
    font-size: 13px;
    background: var(--bg-raised);
    color: var(--text-dim);
    border: 1px solid var(--border);
    cursor: pointer;
  }
  .view-toggle .seg:first-child { border-radius: 8px 0 0 8px; }
  .view-toggle .seg:last-child { border-radius: 0 8px 8px 0; border-left: 0; }
  .view-toggle .seg.active {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
  }

  /* Editor fills the screen; toolbar moves to the bottom, above the home bar. */
  .editor-pane { flex: 1 1 auto; min-height: 0; }
  .editor-wrap { order: 1; padding: 8px; }
  .toolbar {
    order: 2;
    border-bottom: 0;
    border-top: 1px solid var(--border);
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
    justify-content: center;
    gap: 8px;
  }
  .toolbar .btn { min-height: 44px; }
  .editor-hint { display: none; }
  .dropzone { padding: 32px 16px; }

  /* Preview replaces the editor when toggled. */
  .preview-pane {
    display: none;
    border-left: 0;
    padding-bottom: calc(14px + env(safe-area-inset-bottom));
  }
  .layout.show-preview .editor-pane { display: none; }
  .layout.show-preview .preview-pane { display: flex; flex: 1 1 auto; }
}

@media (max-width: 359px) {
  .github-link { display: none; }
}

/* Landscape phones: reclaim vertical space. */
@media (max-width: 900px) and (max-height: 500px) and (orientation: landscape) {
  .page-item .thumb { height: 44px; }
  .page-item .page-meta { display: none; }
  .view-toggle { padding: 4px 8px; }
  .view-toggle .seg { padding: 5px 0; }
}

[hidden] { display: none !important; }