/* ==========================================================
   SN Tools — Design tokens & base
   ========================================================== */

:root {
  --ink-950: #0B1220;
  --paper-50: #FBFAF7;
  --signal-500: #D98A22;
  --blueprint-600: #2E5AAC;
  color-scheme: light;
}
html.dark { color-scheme: dark; }

::selection {
  background-color: rgba(217, 138, 34, 0.28);
  color: inherit;
}

body {
  font-feature-settings: "ss01" on;
}

/* ==========================================================
   Scrollbar
   ========================================================== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(148, 152, 166, 0.45);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(148, 152, 166, 0.7); }

/* ==========================================================
   Tab transitions
   ========================================================== */
.tab-content { animation: fadeIn 0.22s ease-out; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .tab-content { animation: none; }
}

/* ==========================================================
   Hero — blueprint grid backdrop (subject-grounded decoration)
   ========================================================== */
.blueprint-grid {
  background-image:
    linear-gradient(to right, rgba(46, 90, 172, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 90, 172, 0.09) 1px, transparent 1px);
  background-size: 22px 22px;
}
html.dark .blueprint-grid {
  background-image:
    linear-gradient(to right, rgba(94, 134, 201, 0.14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(94, 134, 201, 0.14) 1px, transparent 1px);
}

/* ==========================================================
   Dropzones
   ========================================================== */
.drag-active {
  border-color: var(--blueprint-600) !important;
  background-color: rgba(46, 90, 172, 0.06) !important;
}

/* ==========================================================
   Split PDF — thumbnail selection with checkmark badge
   ========================================================== */
.page-thumb { position: relative; }
.page-thumb .thumb-check {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 20px;
  height: 20px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blueprint-600);
  color: #fff;
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.15s ease, transform 0.15s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.25);
}
.page-thumb.is-selected .thumb-check {
  opacity: 1;
  transform: scale(1);
}
.page-thumb .thumb-check svg { width: 12px; height: 12px; stroke-width: 3; }

/* ==========================================================
   QR camera viewport
   ========================================================== */
#cameraPlaceholder.hidden { display: none !important; }

#reader {
  min-height: 280px;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  position: absolute !important;
  inset: 0;
}
#cameraPlaceholder { position: relative; z-index: 10; }
#reader img { position: relative !important; z-index: 20 !important; border-radius: 12px; }
#reader video { border-radius: 12px; }

/* ==========================================================
   Sticky notes — index card style
   ========================================================== */
.note-card {
  position: relative;
  border-left-width: 4px;
  border-left-style: solid;
}
.note-card textarea::placeholder { opacity: 0.55; }

/* ==========================================================
   Focus visibility (accessibility floor)
   ========================================================== */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--signal-500);
  outline-offset: 2px;
}