/* O atributo `hidden` do HTML só é aplicado pela folha do navegador, e qualquer
   `display` declarado aqui vence essa regra. Sem esta linha, .toolbar, .loader
   e .drag-overlay ficariam sempre visíveis. */
[hidden] { display: none !important; }

/* ---------- Tokens ---------- */
:root {
  --bg: #f4f6fa;
  --surface: #ffffff;
  --surface-2: #eef1f7;
  --border: #d9dee9;
  --text: #161d29;
  --muted: #6b7687;
  --primary: #2f6df6;
  --primary-ink: #ffffff;
  --success: #12875a;
  --danger: #d03535;
  --accent-soft: #e6eeff;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1218;
    --surface: #171c25;
    --surface-2: #1e2531;
    --border: #2b3340;
    --text: #e8ecf3;
    --muted: #97a1b2;
    --primary: #4c84ff;
    --primary-ink: #ffffff;
    --success: #2bb27c;
    --danger: #ef5b5b;
    --accent-soft: #1d2a45;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

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

body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding-bottom: 48px;
}

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 28px; line-height: 1; }
.brand h1 { margin: 0; font-size: 17px; letter-spacing: -.01em; }
.brand p { margin: 2px 0 0; font-size: 12.5px; color: var(--muted); }

.actions { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---------- Buttons ---------- */
.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 9px 14px;
  border-radius: 9px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, border-color .15s, opacity .15s, transform .05s;
  white-space: nowrap;
}
.btn:hover:not(:disabled) { background: var(--surface-2); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-sm { padding: 7px 11px; font-size: 12.5px; }

.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn-primary:hover:not(:disabled) { filter: brightness(1.08); background: var(--primary); }

.btn-success { background: var(--success); border-color: var(--success); color: #fff; }
.btn-success:hover:not(:disabled) { filter: brightness(1.08); background: var(--success); }

.btn-danger { color: var(--danger); border-color: var(--danger); background: transparent; }
.btn-danger:hover:not(:disabled) { background: var(--danger); color: #fff; }

.linklike {
  background: none; border: 0; padding: 0;
  color: var(--primary); font: inherit; font-weight: 600;
  cursor: pointer; text-decoration: underline;
}

/* ---------- Toolbar ---------- */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  align-items: center;
  padding: 12px 20px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 73px;
  z-index: 15;
}
.tool-group { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.counter { font-size: 13px; color: var(--muted); }
.counter strong { color: var(--text); }

.input-range {
  width: 150px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
  color: var(--text);
  font-size: 12.5px;
}
.zoom { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--muted); }
.zoom input { width: 120px; }

/* ---------- Dropzone ---------- */
main { padding: 20px; }

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 16px;
  background: var(--surface);
  padding: 56px 20px;
  text-align: center;
  max-width: 720px;
  margin: 40px auto;
}
.dz-icon { font-size: 34px; display: block; margin-bottom: 10px; color: var(--primary); }
.dropzone h2 { margin: 0 0 6px; font-size: 20px; }
.dropzone p { margin: 0 0 14px; color: var(--muted); }
.dropzone small { color: var(--muted); font-size: 12px; }

/* ---------- Grid de páginas ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--card, 200px), 1fr));
  gap: 16px;
  align-content: start;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
  cursor: grab;
  transition: border-color .15s, box-shadow .15s, opacity .15s;
}
.card:active { cursor: grabbing; }
.card.selected { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary) inset; }
.card.dragging { opacity: .35; }
.card.drop-before { box-shadow: -3px 0 0 0 var(--primary); }
.card.drop-after { box-shadow: 3px 0 0 0 var(--primary); }

.thumb {
  aspect-ratio: 1 / 1;
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  overflow: hidden;
}
.thumb img {
  max-width: 100%;
  max-height: 100%;
  background: #fff;
  box-shadow: 0 1px 6px rgba(0, 0, 0, .18);
  transition: transform .2s ease;
  pointer-events: none;
}
.thumb .placeholder {
  width: 28px; height: 28px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

.meta {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-top: 1px solid var(--border);
  font-size: 12px;
}
.meta .num {
  background: var(--accent-soft);
  color: var(--primary);
  font-weight: 700;
  border-radius: 6px;
  padding: 2px 7px;
  flex: none;
}
.meta .src {
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-tools {
  position: absolute;
  top: 8px; right: 8px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity .15s;
}
.card:hover .card-tools, .card.selected .card-tools { opacity: 1; }
.card-tools button {
  width: 28px; height: 28px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow);
}
.card-tools button:hover { background: var(--surface-2); }
.card-tools .del:hover { background: var(--danger); color: #fff; border-color: var(--danger); }

.check {
  position: absolute;
  top: 8px; left: 8px;
  width: 22px; height: 22px;
  border-radius: 6px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  display: grid;
  place-items: center;
  font-size: 13px;
  color: transparent;
  box-shadow: var(--shadow);
}
.card.selected .check { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---------- Overlays ---------- */
.drag-overlay {
  position: fixed;
  inset: 0;
  background: rgba(47, 109, 246, .12);
  backdrop-filter: blur(2px);
  display: grid;
  place-items: center;
  z-index: 60;
  pointer-events: none;
}
.drag-overlay div {
  background: var(--surface);
  border: 2px dashed var(--primary);
  color: var(--primary);
  padding: 22px 34px;
  border-radius: 14px;
  font-size: 17px;
  font-weight: 700;
}

.loader {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .45);
  display: grid;
  place-items: center;
  z-index: 70;
}
.loader-box {
  background: var(--surface);
  border-radius: 14px;
  padding: 26px 34px;
  text-align: center;
  box-shadow: var(--shadow);
}
.loader-box p { margin: 12px 0 0; font-size: 13px; color: var(--muted); }
.spinner {
  width: 30px; height: 30px;
  margin: 0 auto;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 11px 18px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  z-index: 80;
  box-shadow: var(--shadow);
  max-width: min(90vw, 480px);
}
.toast.error { background: var(--danger); color: #fff; }

.footer {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  padding: 8px 20px;
  font-size: 11.5px;
  color: var(--muted);
  background: var(--surface);
  border-top: 1px solid var(--border);
  text-align: center;
}

/* ---------- Responsivo ---------- */
@media (max-width: 760px) {
  .topbar { position: static; }
  .toolbar { position: static; }
  .brand p { display: none; }
  main { padding: 14px; }
  .grid { --card: 140px !important; }
}