/* ──────────────────────────────────────────────────────────────────────
   SharedFiles module — stylesheet
   File: /assets/sharedfiles/sharedfiles.css
   Scope: every selector is prefixed .sf- AND lives under #viewer-body,
          so it can never bleed into other parts of the portal.
   ────────────────────────────────────────────────────────────────────── */

#viewer-body .sf-root {
  --sf-bg: #fafbfc;
  --sf-card: #ffffff;
  --sf-border: #e5e7eb;
  --sf-border-strong: #cbd5e1;
  --sf-text: #0f172a;
  --sf-muted: #64748b;
  --sf-accent: #2563eb;
  --sf-accent-soft: #dbeafe;
  --sf-danger: #dc2626;
  --sf-danger-soft: #fee2e2;
  --sf-success: #059669;
  --sf-shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 4px 14px rgba(15, 23, 42, 0.05);
  --sf-shadow-hover: 0 4px 10px rgba(15, 23, 42, 0.08), 0 12px 28px rgba(15, 23, 42, 0.08);
  --sf-radius: 14px;
  --sf-radius-sm: 10px;

  box-sizing: border-box;
  width: 100%;
  min-height: 100%;
  padding: 18px 20px 40px;
  background: var(--sf-bg);
  color: var(--sf-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.45;
}

#viewer-body .sf-root *,
#viewer-body .sf-root *::before,
#viewer-body .sf-root *::after {
  box-sizing: border-box;
}

/* ── Toolbar ────────────────────────────────────────────────────────── */
#viewer-body .sf-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

#viewer-body .sf-search {
  flex: 1 1 240px;
  min-width: 180px;
  position: relative;
}

#viewer-body .sf-search input {
  width: 100%;
  height: 38px;
  padding: 0 14px 0 36px;
  border: 1px solid var(--sf-border);
  border-radius: 999px;
  background: #fff;
  font-size: 14px;
  color: var(--sf-text);
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
#viewer-body .sf-search input:focus {
  border-color: var(--sf-accent);
  box-shadow: 0 0 0 3px var(--sf-accent-soft);
}
#viewer-body .sf-search::before {
  content: "";
  position: absolute;
  left: 13px; top: 50%; transform: translateY(-50%);
  width: 14px; height: 14px;
  background: center/contain no-repeat
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'><circle cx='11' cy='11' r='7'/><path d='m20 20-3.5-3.5'/></svg>");
  opacity: .8;
}

#viewer-body .sf-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

#viewer-body .sf-filter-btn {
  appearance: none;
  border: 1px solid var(--sf-border);
  background: #fff;
  color: var(--sf-muted);
  padding: 0 14px;
  height: 34px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background .12s ease, color .12s ease, border-color .12s ease;
}
#viewer-body .sf-filter-btn:hover {
  border-color: var(--sf-border-strong);
  color: var(--sf-text);
}
#viewer-body .sf-filter-btn.is-active {
  background: var(--sf-text);
  border-color: var(--sf-text);
  color: #fff;
}

/* ── Teacher actions row ───────────────────────────────────────────── */
#viewer-body .sf-manage {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-left: auto;
}

#viewer-body .sf-btn {
  appearance: none;
  border: 1px solid var(--sf-border);
  background: #fff;
  color: var(--sf-text);
  padding: 0 14px;
  height: 36px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background .12s ease, border-color .12s ease, transform .06s ease;
}
#viewer-body .sf-btn:hover { border-color: var(--sf-border-strong); }
#viewer-body .sf-btn:active { transform: translateY(1px); }
#viewer-body .sf-btn--primary {
  background: var(--sf-accent);
  border-color: var(--sf-accent);
  color: #fff;
}
#viewer-body .sf-btn--primary:hover { background: #1d4ed8; border-color: #1d4ed8; }
#viewer-body .sf-btn--danger {
  background: #fff;
  border-color: var(--sf-danger);
  color: var(--sf-danger);
}
#viewer-body .sf-btn--danger:hover { background: var(--sf-danger-soft); }
#viewer-body .sf-btn--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--sf-muted);
}
#viewer-body .sf-btn--ghost:hover { color: var(--sf-text); background: #f1f5f9; }

/* ── Drop zone ─────────────────────────────────────────────────────── */
#viewer-body .sf-dropzone {
  border: 2px dashed var(--sf-border-strong);
  border-radius: var(--sf-radius);
  background: #fff;
  padding: 22px;
  margin-bottom: 18px;
  text-align: center;
  color: var(--sf-muted);
  font-size: 13px;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
#viewer-body .sf-dropzone.is-hover {
  background: var(--sf-accent-soft);
  border-color: var(--sf-accent);
  color: var(--sf-accent);
}
#viewer-body .sf-dropzone b { color: var(--sf-text); font-weight: 600; }
#viewer-body .sf-dropzone-actions {
  margin-top: 10px;
  display: inline-flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ── Progress list ─────────────────────────────────────────────────── */
#viewer-body .sf-progress-list { margin-bottom: 14px; display: grid; gap: 8px; }
#viewer-body .sf-progress {
  background: #fff;
  border: 1px solid var(--sf-border);
  border-radius: var(--sf-radius-sm);
  padding: 10px 12px;
  font-size: 13px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: center;
}
#viewer-body .sf-progress-name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#viewer-body .sf-progress-pct { color: var(--sf-muted); font-variant-numeric: tabular-nums; }
#viewer-body .sf-progress-bar {
  grid-column: 1 / -1;
  height: 6px; background: #e5e7eb; border-radius: 999px; overflow: hidden;
}
#viewer-body .sf-progress-bar > i {
  display: block; height: 100%; background: var(--sf-accent);
  transition: width .15s ease;
}
#viewer-body .sf-progress.is-error .sf-progress-pct { color: var(--sf-danger); }
#viewer-body .sf-progress.is-error .sf-progress-bar > i { background: var(--sf-danger); }
#viewer-body .sf-progress.is-done .sf-progress-bar > i { background: var(--sf-success); }

/* ── Grid ──────────────────────────────────────────────────────────── */
#viewer-body .sf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
  gap: 16px;
}

#viewer-body .sf-card {
  position: relative;
  background: var(--sf-card);
  border: 1px solid var(--sf-border);
  border-radius: var(--sf-radius);
  padding: 14px 10px 12px;
  text-align: center;
  cursor: pointer;
  box-shadow: var(--sf-shadow);
  transition: transform .12s ease, box-shadow .18s ease, border-color .15s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-height: 160px;
}
#viewer-body .sf-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--sf-shadow-hover);
  border-color: var(--sf-border-strong);
}
#viewer-body .sf-card.is-hidden-row { opacity: .55; }
#viewer-body .sf-card.is-featured { border-color: #facc15; background: linear-gradient(180deg, #fffbeb 0%, #ffffff 100%); }

#viewer-body .sf-card-icon {
  width: 64px; height: 64px;
  border-radius: 999px;
  display: flex; align-items: center; justify-content: center;
  flex: 0 0 auto;
  background: #f1f5f9;
  color: #475569;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: .5px;
  user-select: none;
  pointer-events: none;
}
#viewer-body .sf-card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--sf-text);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  word-break: break-word;
  line-height: 1.3;
  max-width: 100%;
}
#viewer-body .sf-card-meta {
  font-size: 11px;
  color: var(--sf-muted);
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
}
#viewer-body .sf-badge {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .4px;
  text-transform: uppercase;
  background: #e2e8f0;
  color: #334155;
}
#viewer-body .sf-badge--pdf      { background:#fee2e2; color:#b91c1c; }
#viewer-body .sf-badge--audio    { background:#ede9fe; color:#6d28d9; }
#viewer-body .sf-badge--image    { background:#d1fae5; color:#047857; }
#viewer-body .sf-badge--youtube  { background:#fee2e2; color:#b91c1c; }
#viewer-body .sf-badge--link     { background:#dbeafe; color:#1d4ed8; }
#viewer-body .sf-badge--doc      { background:#fef3c7; color:#92400e; }
#viewer-body .sf-badge--star     { background:#fde68a; color:#78350f; }
#viewer-body .sf-badge--new      { background:#cffafe; color:#155e75; }
#viewer-body .sf-badge--hidden   { background:#e2e8f0; color:#475569; }

/* Card manage overlay (teachers) */
#viewer-body .sf-card-actions {
  position: absolute;
  top: 6px; right: 6px;
  display: flex; gap: 4px;
  opacity: 0;
  transition: opacity .12s ease;
}
#viewer-body .sf-card:hover .sf-card-actions,
#viewer-body .sf-card:focus-within .sf-card-actions { opacity: 1; }
#viewer-body .sf-icon-btn {
  appearance: none;
  width: 28px; height: 28px;
  border-radius: 8px;
  border: 1px solid var(--sf-border);
  background: #fff;
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--sf-muted);
  transition: background .12s, color .12s, border-color .12s;
  padding: 0;
}
#viewer-body .sf-icon-btn:hover { color: var(--sf-text); border-color: var(--sf-border-strong); background: #f8fafc; }
#viewer-body .sf-icon-btn--danger:hover { color: var(--sf-danger); border-color: var(--sf-danger); background: var(--sf-danger-soft); }

/* Drag handle (teachers) */
#viewer-body .sf-drag-handle {
  position: absolute;
  top: 6px; left: 6px;
  width: 22px; height: 22px;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  color: #94a3b8;
  cursor: grab;
  opacity: 0;
  transition: opacity .12s ease;
}
#viewer-body .sf-card:hover .sf-drag-handle { opacity: 1; }
#viewer-body .sf-card.is-dragging { opacity: .5; }
#viewer-body .sf-card.is-drag-over { outline: 2px dashed var(--sf-accent); outline-offset: -4px; }

/* ── Empty / loading / error states ────────────────────────────────── */
#viewer-body .sf-empty,
#viewer-body .sf-loading,
#viewer-body .sf-error {
  text-align: center;
  padding: 48px 20px;
  color: var(--sf-muted);
  font-size: 14px;
  background: #fff;
  border: 1px dashed var(--sf-border);
  border-radius: var(--sf-radius);
}
#viewer-body .sf-error {
  border-color: var(--sf-danger);
  background: var(--sf-danger-soft);
  color: var(--sf-danger);
}
#viewer-body .sf-empty-title { font-size: 16px; font-weight: 600; color: var(--sf-text); margin-bottom: 6px; }

#viewer-body .sf-skeleton {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
  gap: 16px;
}
#viewer-body .sf-skeleton-card {
  height: 160px;
  background: linear-gradient(90deg, #f1f5f9 0%, #e2e8f0 50%, #f1f5f9 100%);
  background-size: 200% 100%;
  border-radius: var(--sf-radius);
  animation: sf-shimmer 1.4s linear infinite;
}
@keyframes sf-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Viewer overlay (inline, within #viewer-body only) ─────────────── */
#viewer-body .sf-viewer {
  position: absolute;
  inset: 0;
  background: #fff;
  z-index: 2;
  display: flex;
  flex-direction: column;
  border-radius: 0;
  animation: sf-fade-in .16s ease;
}
@keyframes sf-fade-in { from { opacity: 0; } to { opacity: 1; } }

#viewer-body .sf-viewer-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--sf-border);
  background: #fff;
  flex: 0 0 auto;
  min-height: 52px;
}
#viewer-body .sf-viewer-title {
  font-weight: 600;
  font-size: 14px;
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#viewer-body .sf-viewer-tools {
  display: flex;
  gap: 6px;
  flex: 0 0 auto;
}
#viewer-body .sf-viewer-body {
  flex: 1 1 auto;
  min-height: 0;
  position: relative;
  background: #1e293b;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* PDF viewer */
#viewer-body .sf-pdf-frame {
  width: 100%; height: 100%; border: 0;
  display: block;
  background: #fff;
}

/* YouTube viewer */
#viewer-body .sf-yt-wrap {
  width: 100%; max-width: 1200px;
  aspect-ratio: 16/9;
  background: #000;
}
#viewer-body .sf-yt-wrap iframe { width: 100%; height: 100%; border: 0; display: block; }

/* Image viewer */
#viewer-body .sf-img-wrap {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  overflow: auto;
}
#viewer-body .sf-img-wrap img {
  max-width: 100%; max-height: 100%;
  transition: transform .15s ease;
  transform-origin: center center;
  user-select: none;
  -webkit-user-drag: none;
}
#viewer-body .sf-img-wrap.is-fit img { max-width: 100%; max-height: 100%; }

/* Audio viewer */
#viewer-body .sf-audio-card {
  background: #fff;
  color: var(--sf-text);
  padding: 28px 28px 24px;
  border-radius: var(--sf-radius);
  box-shadow: 0 8px 30px rgba(0,0,0,.25);
  width: min(520px, 92vw);
  display: grid;
  gap: 16px;
}
#viewer-body .sf-audio-card h4 {
  margin: 0; font-size: 16px; font-weight: 600;
  word-break: break-word;
}
#viewer-body .sf-audio-seek {
  width: 100%;
  height: 6px;
  background: #e5e7eb;
  border-radius: 999px;
  position: relative;
  cursor: pointer;
}
#viewer-body .sf-audio-seek > i {
  display: block; height: 100%;
  background: var(--sf-accent);
  border-radius: 999px;
  transition: width .08s linear;
  width: 0%;
}
#viewer-body .sf-audio-times {
  display: flex; justify-content: space-between;
  font-size: 12px; color: var(--sf-muted);
  font-variant-numeric: tabular-nums;
}
#viewer-body .sf-audio-controls {
  display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap;
}
#viewer-body .sf-audio-controls .sf-btn { height: 40px; padding: 0 14px; }
#viewer-body .sf-audio-play {
  width: 54px; height: 54px; border-radius: 50%;
  font-size: 20px;
}
#viewer-body .sf-audio-speed {
  appearance: none;
  height: 36px;
  border: 1px solid var(--sf-border);
  border-radius: 10px;
  background: #fff;
  padding: 0 10px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
}

/* Link preview */
#viewer-body .sf-link-card {
  background: #fff;
  color: var(--sf-text);
  padding: 28px;
  border-radius: var(--sf-radius);
  width: min(520px, 92vw);
  text-align: center;
  box-shadow: 0 8px 30px rgba(0,0,0,.25);
  display: grid;
  gap: 12px;
}
#viewer-body .sf-link-url {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  color: var(--sf-muted);
  word-break: break-all;
  background: #f1f5f9;
  padding: 8px 10px;
  border-radius: 8px;
}

/* ── Inline meta editor (teacher) ──────────────────────────────────── */
#viewer-body .sf-meta-edit {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, .4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
  padding: 20px;
}
#viewer-body .sf-meta-edit-card {
  background: #fff;
  border-radius: var(--sf-radius);
  width: min(460px, 100%);
  padding: 20px;
  box-shadow: 0 20px 40px rgba(0,0,0,.2);
  display: grid;
  gap: 12px;
}
#viewer-body .sf-meta-edit-card h4 { margin: 0; font-size: 15px; }
#viewer-body .sf-meta-edit-card label {
  font-size: 12px; font-weight: 600; color: var(--sf-muted); text-transform: uppercase; letter-spacing: .4px;
  display: block; margin-bottom: 4px;
}
#viewer-body .sf-meta-edit-card input,
#viewer-body .sf-meta-edit-card textarea {
  width: 100%;
  border: 1px solid var(--sf-border);
  border-radius: 10px;
  padding: 9px 12px;
  font: inherit;
  background: #fff;
  color: var(--sf-text);
  outline: none;
}
#viewer-body .sf-meta-edit-card input:focus,
#viewer-body .sf-meta-edit-card textarea:focus {
  border-color: var(--sf-accent);
  box-shadow: 0 0 0 3px var(--sf-accent-soft);
}
#viewer-body .sf-meta-edit-card textarea { resize: vertical; min-height: 70px; }
#viewer-body .sf-meta-edit-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
}
#viewer-body .sf-meta-edit-check {
  display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--sf-text);
}

/* Toast */
#viewer-body .sf-toast {
  position: absolute;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  background: #0f172a;
  color: #fff;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  z-index: 10;
  box-shadow: 0 8px 24px rgba(0,0,0,.25);
  animation: sf-toast-in .2s ease;
}
#viewer-body .sf-toast.is-danger { background: var(--sf-danger); }
@keyframes sf-toast-in {
  from { transform: translate(-50%, 8px); opacity: 0; }
  to   { transform: translate(-50%, 0);   opacity: 1; }
}

/* ── Mobile ────────────────────────────────────────────────────────── */
@media (max-width: 720px) {
  #viewer-body .sf-root { padding: 14px 12px 60px; }
  #viewer-body .sf-grid,
  #viewer-body .sf-skeleton { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 12px; }
  #viewer-body .sf-card { min-height: 140px; padding: 12px 8px 10px; }
  #viewer-body .sf-card-icon { width: 54px; height: 54px; font-size: 22px; }
  #viewer-body .sf-toolbar { gap: 8px; }
  #viewer-body .sf-manage { margin-left: 0; width: 100%; }
}

/* Ensure #viewer-body is a positioning context for the inline viewer overlay. */
#viewer-body { position: relative; }