:root {
  --shell: #1b1e23;
  --panel: #22262c;
  --panel-border: #33383f;
  --ink: #e9e7e1;
  --ink-dim: #9a9d9f;
  --brass: #c9a15a;
  --brass-dim: #8a7148;
  --paper: #fdfcf8;
  --paper-shadow: rgba(0, 0, 0, 0.55);
  --danger: #d16a5f;
  --radius: 5px;
  --font-serif: "Source Serif 4", Georgia, serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

/* The hidden attribute must beat any display rule set below */
[hidden] {
  display: none !important;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--shell);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ---------- Toolbar ---------- */

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 18px;
  height: 56px;
  flex-shrink: 0;
  background: var(--panel);
  border-bottom: 1px solid var(--panel-border);
  box-shadow: 0 1px 0 rgba(201, 161, 90, 0.12);
}

.brand {
  flex: 0 0 auto;
  min-width: 90px;
}

.brand-mark {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 600;
  font-size: 20px;
  letter-spacing: 0.2px;
  color: var(--ink);
  border-bottom: 1.5px solid var(--brass);
  padding-bottom: 2px;
}

.toolbar-center {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.toolbar-end {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-dim);
  cursor: pointer;
  transition:
    background 0.12s ease,
    color 0.12s ease,
    border-color 0.12s ease;
}

.icon-btn:hover:not(:disabled) {
  background: rgba(201, 161, 90, 0.1);
  border-color: var(--panel-border);
  color: var(--brass);
}

.icon-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

.icon-btn:focus-visible,
.text-btn:focus-visible,
#pageInput:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

.text-btn {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition:
    border-color 0.12s ease,
    color 0.12s ease;
  white-space: nowrap;
}

.text-btn:hover {
  border-color: var(--brass-dim);
  color: var(--brass);
}

.open-btn {
  background: var(--brass);
  border-color: var(--brass);
  color: #201a10;
  font-weight: 600;
}

.open-btn:hover {
  background: #d9ae66;
  border-color: #d9ae66;
  color: #201a10;
}

.page-field {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--ink-dim);
}

#pageInput {
  width: 40px;
  background: var(--shell);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 13px;
  text-align: center;
  padding: 5px 2px;
}

.page-sep {
  color: var(--ink-dim);
}

.zoom-level {
  min-width: 42px;
  text-align: center;
  font-size: 13px;
  color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
}

/* ---------- Viewer ---------- */

.viewer {
  position: relative;
  flex: 1 1 auto;
  overflow: auto;
  overflow-anchor: none; /* we restore scroll position ourselves when zooming */
  scrollbar-gutter: stable; /* keeps fit-width stable when the scrollbar appears */
  background:
    radial-gradient(
      ellipse 60% 50% at 50% 38%,
      rgba(201, 161, 90, 0.07),
      transparent 70%
    ),
    var(--shell);
}

/* ---------- Empty state ---------- */

.empty-state {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
  padding: 56px 64px;
  border: 1.5px dashed var(--panel-border);
  border-radius: 10px;
  color: var(--ink-dim);
  transition:
    border-color 0.15s ease,
    background 0.15s ease;
  max-width: 420px;
}

.dropzone.drag-over {
  border-color: var(--brass);
  background: rgba(201, 161, 90, 0.06);
}

.doc-icon {
  color: var(--brass-dim);
  margin-bottom: 10px;
}

.dropzone-title {
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--ink);
  margin: 4px 0 0;
}

.dropzone-sub {
  font-size: 13.5px;
  color: var(--ink-dim);
  margin: 0 0 18px;
}

/* ---------- Pages ---------- */

.viewer:focus {
  outline: none;
}

.stage-wrap {
  padding: 32px 24px 64px;
}

.pages {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  /* grows with the widest page so zoomed-in pages scroll sideways instead of
     being clipped, and stays centred when they're narrower than the viewer */
  width: max-content;
  min-width: 100%;
}

.page {
  flex: none;
  background: var(--paper);
  box-shadow:
    0 6px 24px rgba(0, 0, 0, 0.45),
    0 1px 4px rgba(0, 0, 0, 0.4);
  line-height: 0;
}

.page canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ---------- Loading ---------- */

.loading-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: var(--ink-dim);
  font-size: 13.5px;
  background: var(--shell);
}

.spinner {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2.5px solid var(--panel-border);
  border-top-color: var(--brass);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---------- Toast ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--ink);
  font-size: 13px;
  padding: 10px 16px;
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  z-index: 20;
}

.toast.error {
  border-color: var(--danger);
  color: #f0b8b1;
}

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
  .toolbar {
    padding: 0 10px;
    gap: 8px;
  }
  .brand-mark {
    font-size: 17px;
  }
  .zoom-group .text-btn {
    display: none;
  }
  .open-btn {
    padding: 6px 10px;
    font-size: 12.5px;
  }
  .dropzone {
    padding: 40px 28px;
  }
  .stage-wrap {
    padding: 20px 10px 40px;
  }
}