/* =====================================================================
   Design tokens
   - Single accent (indigo) for primary actions and active states.
   - Slate neutrals for text/borders so it reads as an internal tool,
     not a marketing site.
   - Small set of status colors: admin=indigo, viewer=slate, danger=rose,
     success=emerald. Used sparingly so the page doesn't feel busy.
   ===================================================================== */
:root {
  --c-bg:           #f5f6fa;
  --c-surface:      #ffffff;
  --c-surface-alt:  #f8fafc;
  --c-border:       #e5e7eb;
  --c-border-soft:  #eef0f4;
  --c-text:         #0f172a;
  --c-text-muted:   #64748b;
  --c-text-soft:    #94a3b8;

  --c-primary:      #4f46e5;       /* indigo-600 */
  --c-primary-hover:#4338ca;       /* indigo-700 */
  --c-primary-soft: #eef2ff;       /* indigo-50 */
  --c-primary-ring: rgba(79, 70, 229, 0.18);

  --c-admin-bg:     #eef2ff;
  --c-admin-fg:     #4338ca;
  --c-viewer-bg:    #f1f5f9;
  --c-viewer-fg:    #475569;
  --c-danger-bg:    #fef2f2;
  --c-danger-fg:    #b91c1c;
  --c-danger-border:#fecaca;
  --c-success-bg:   #ecfdf5;
  --c-success-fg:   #047857;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 14px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

/* =====================================================================
   Base
   ===================================================================== */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font: 14px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  color: var(--c-text);
  background:
    radial-gradient(1200px 600px at -10% -20%, rgba(79, 70, 229, 0.06), transparent 60%),
    radial-gradient(900px 500px at 110% 0%, rgba(14, 165, 233, 0.05), transparent 60%),
    var(--c-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { margin: 0 0 0.5rem; color: var(--c-text); }
h2 { font-size: 1.05rem; font-weight: 600; letter-spacing: -0.01em; }
.muted { color: var(--c-text-muted); }
.center { text-align: center; }
.error { color: var(--c-danger-fg); margin: 0.5rem 0 0; font-size: 13px; }
.loading { color: var(--c-text-muted); font-style: italic; }

/* Role badges — used in the navbar and on user rows */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--c-viewer-bg);
  color: var(--c-viewer-fg);
}
.badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.7;
}
.badge.admin  { background: var(--c-admin-bg);  color: var(--c-admin-fg); }
.badge.viewer { background: var(--c-viewer-bg); color: var(--c-viewer-fg); }

/* =====================================================================
   Auth (login page)
   ===================================================================== */
.auth-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background:
    radial-gradient(800px 500px at 50% 0%, rgba(79, 70, 229, 0.12), transparent 70%),
    var(--c-bg);
}
.auth-card {
  width: min(400px, 100%);
  padding: 2.25rem 2rem;
  background: var(--c-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--c-border-soft);
}
.auth-card .auth-logo {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 1rem;
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.3);
}
.auth-card h1 { font-size: 1.4rem; font-weight: 700; letter-spacing: -0.01em; }
.auth-card > .muted { margin-top: -0.25rem; margin-bottom: 1.25rem; }

/* =====================================================================
   Forms
   ===================================================================== */
form label {
  display: block;
  margin-top: 1rem;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-text-muted);
  text-transform: uppercase;
}
form input, form select, form button, .tab {
  font: inherit;
  margin-top: 0.35rem;
}
form input, form select,
.search-bar input, .search-bar select {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  background: var(--c-surface);
  color: var(--c-text);
  transition: border-color 0.15s, box-shadow 0.15s;
}
form input:focus, form select:focus,
.search-bar input:focus, .search-bar select:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px var(--c-primary-ring);
}
form input::placeholder { color: var(--c-text-soft); }

/* Primary button */
form button {
  margin-top: 1.25rem;
  padding: 0.6rem 1rem;
  border: 0;
  border-radius: var(--radius-sm);
  background: var(--c-primary);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
  transition: background 0.15s, transform 0.05s, box-shadow 0.15s;
}
form button:hover { background: var(--c-primary-hover); box-shadow: 0 6px 16px rgba(79, 70, 229, 0.3); }
form button:active { transform: translateY(1px); }
form button:disabled { background: #c7d2fe; box-shadow: none; cursor: not-allowed; }

.inline-form { display: flex; gap: 0.5rem; align-items: center; }
.inline-form input { flex: 1; }

/* =====================================================================
   Navbar
   ===================================================================== */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.5rem;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(8px);
}
.navbar-brand {
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.navbar-brand::before {
  content: '';
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  box-shadow: 0 2px 6px rgba(79, 70, 229, 0.35);
}
.navbar-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.navbar-user #user-email {
  font-size: 13px;
  color: var(--c-text);
  font-weight: 500;
}
.navbar-user button {
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--c-text);
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s;
}
.navbar-user button:hover { background: var(--c-surface-alt); border-color: #cbd5e1; }

/* =====================================================================
   Tabs
   ===================================================================== */
.tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--c-border);
  background: var(--c-surface);
}
.tab {
  border: 0;
  background: transparent;
  padding: 0.85rem 1rem;
  cursor: pointer;
  color: var(--c-text-muted);
  font-weight: 500;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s, border-color 0.15s;
}
.tab:hover { color: var(--c-text); }
.tab.active {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
}

main { padding: 1.75rem 1.5rem 3rem; max-width: 1200px; margin: 0 auto; }
.view { display: none; }
.view.active { display: block; animation: fadeIn 0.15s ease-out; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(2px); }
  to   { opacity: 1; transform: none; }
}

/* =====================================================================
   Search bar
   ===================================================================== */
.search-bar {
  display: grid;
  grid-template-columns: 2.4fr 1fr 1.5fr 1fr 1fr;
  gap: 0.6rem;
  margin-bottom: 1rem;
  padding: 0.85rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
@media (max-width: 900px) {
  .search-bar { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
  .search-bar { grid-template-columns: 1fr; }
}

.results-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0.5rem 0.25rem;
  font-size: 13px;
  color: var(--c-text-muted);
}

/* =====================================================================
   Results table
   ===================================================================== */
.results {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--c-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border-soft);
}
.results th, .results td {
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--c-border-soft);
  vertical-align: middle;
}
.results thead th {
  background: var(--c-surface-alt);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--c-text-muted);
}
.results tbody tr:last-child td { border-bottom: 0; }
.results tbody tr:hover { background: #fafbff; }

.results td.title-cell {
  font-weight: 600;
  color: var(--c-text);
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  margin: 0 3px 3px 0;
  background: var(--c-primary-soft);
  color: var(--c-primary);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.category-chip {
  display: inline-block;
  padding: 2px 8px;
  background: #f1f5f9;
  color: var(--c-text-muted);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.actions { display: flex; gap: 0.4rem; }
.icon-btn {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  color: var(--c-text);
  transition: background 0.15s, border-color 0.15s;
}
.icon-btn:hover { background: var(--c-surface-alt); border-color: #cbd5e1; }
.icon-btn.primary {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
}
.icon-btn.primary:hover { background: var(--c-primary-hover); border-color: var(--c-primary-hover); }
.icon-btn.danger {
  color: var(--c-danger-fg);
  border-color: var(--c-danger-border);
}
.icon-btn.danger:hover { background: var(--c-danger-bg); }

/* Empty state inside a results table */
.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--c-text-muted);
}
.empty-state-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 0.75rem;
  border-radius: 50%;
  background: var(--c-primary-soft);
  display: grid;
  place-items: center;
  color: var(--c-primary);
  font-size: 18px;
}

/* =====================================================================
   Admin sections
   ===================================================================== */
section h2 {
  font-size: 1rem;
  margin: 2rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text);
}

#category-list {
  list-style: none;
  padding: 0;
  margin: 0.6rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
#category-list li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text);
}
#category-list li.muted {
  background: transparent;
  border: 1px dashed var(--c-border);
  color: var(--c-text-muted);
}

/* Form cards on the admin page — wrap each <form> in a card-like surface */
#upload-form, #edit-form, #category-form, #user-form {
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.25rem 0.5rem;
  box-shadow: var(--shadow-sm);
  max-width: 640px;
}
#category-form {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
  padding: 1rem;
}
#category-form label {
  flex: 1;
  margin-top: 0;
}
#category-form button { margin-top: 0.6rem; flex-shrink: 0; }

/* Inline cancel button on the edit form */
#edit-cancel {
  background: transparent;
  color: var(--c-text-muted);
  box-shadow: none;
  margin-left: 0.5rem;
}
#edit-cancel:hover {
  background: var(--c-surface-alt);
  color: var(--c-text);
  box-shadow: none;
}