/* Glassroom Demo Dashboard — style.css */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:              #2D6CB4;
  --blue-light:        #4A90D9;
  --blue-dark:         #1e4d84;
  --text:              #1A1A2E;
  --text-secondary:    #4a4a5a;
  --text-muted:        #7a7a8a;
  --bg:                #FAFAFA;
  --bg-white:          #ffffff;
  --border:            #e4e4e8;
  --radius:            6px;

  /* Status badge colors — identical to Flask app */
  --status-assigned-bg:  #FEF3C7;
  --status-assigned-tx:  #92400E;
  --status-missing-bg:   #FEE2E2;
  --status-missing-tx:   #991B1B;
  --status-graded-bg:    #D1FAE5;
  --status-graded-tx:    #166534;
  --status-turned-in-bg: #DBEAFE;
  --status-turned-in-tx: #1E40AF;
  --status-done-bg:      #D1FAE5;
  --status-done-tx:      #166534;
  --status-unknown-bg:   #F3F4F6;
  --status-unknown-tx:   #6B7280;
}

html { font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ── Demo banner ── */
.demo-banner {
  background: var(--blue-dark);
  color: #fff;
  font-size: 0.875rem;
  padding: 0.6rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.demo-banner a { color: #93c5fd; text-underline-offset: 2px; }
.demo-banner strong { font-weight: 600; }
.demo-banner .demo-spacer { flex: 1; }

/* ── Nav ── */
nav {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  padding: 0 1.25rem;
  display: flex;
  align-items: stretch;
  gap: 0;
  height: 48px;
}
.nav-brand {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  padding-right: 1.5rem;
  letter-spacing: -0.02em;
}
.nav-links {
  display: flex;
  align-items: stretch;
  gap: 0;
}
.nav-link {
  display: flex;
  align-items: center;
  padding: 0 0.9rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.12s, border-color 0.12s;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
  font-family: inherit;
  height: 100%;
}
.nav-link:hover { color: var(--text); }
.nav-link.active { color: var(--blue); border-bottom-color: var(--blue); font-weight: 500; }
.nav-link.disabled { color: var(--text-muted); cursor: default; pointer-events: none; }
.nav-spacer { flex: 1; }

/* ── Layout ── */
.main { padding: 1.5rem 1.25rem; max-width: 1100px; margin: 0 auto; }
.page-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.page-header h1 { font-size: 1.4rem; font-weight: 700; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.45rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  font-family: inherit;
  transition: background 0.12s;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); }
.btn-secondary {
  background: var(--bg-white);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { background: #f0f0f0; }
.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.8rem; }

/* ── Class stat cards (summary row) ── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.stat-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  transition: box-shadow 0.15s, border-color 0.15s;
}
.stat-card:hover {
  border-color: #6366F1;
  box-shadow: 0 0 0 2px rgba(99,102,241,0.15);
}
.stat-card-name {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.stat-card-numbers {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-val { font-size: 1.2rem; font-weight: 700; display: block; line-height: 1.1; }
.stat-lbl { font-size: 0.7rem; color: var(--text-muted); }
.stat-missing .stat-val { color: #991B1B; }
.stat-todo .stat-val { color: #92400E; }
.stat-done .stat-val { color: #166534; }
.stat-zero .stat-val { color: #9CA3AF; }           /* grey = absent signal */
.stat-card-warn { border-color: #FCA5A5; background: #FFF5F5; }
.stat-card-warn .stat-card-name { color: #B91C1C; }

/* ── Class groups (collapsible) ── */
.class-group {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
}
.class-summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  cursor: pointer;
  user-select: none;
  list-style: none;
  flex-wrap: wrap;
}
.class-summary::-webkit-details-marker { display: none; }
.chevron {
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: transform 0.15s;
  flex-shrink: 0;
}
details[open] .chevron { transform: rotate(90deg); }
.class-summary h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  flex: 1;
  min-width: 180px;
}
.class-mini-stats {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}
.mini-stat {
  font-size: 0.78rem;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  white-space: nowrap;
}
.mini-stat.warn { background: var(--status-missing-bg); color: var(--status-missing-tx); border-color: #fca5a5; }
.mini-stat.amber { background: var(--status-assigned-bg); color: var(--status-assigned-tx); border-color: #fcd34d; }

/* ── Assignment table ── */
.card-body { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
thead th {
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  background: #fafafa;
}
tbody tr { border-bottom: 1px solid var(--border); }
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: #f9f9fb; }
td {
  padding: 0.45rem 0.75rem;
  vertical-align: middle;
  color: var(--text);
}
td.title-cell { max-width: 320px; }
td.title-cell a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}
td.title-cell a:hover { color: var(--blue); text-decoration: underline; }
td.nowrap { white-space: nowrap; color: var(--text-secondary); font-size: 0.8rem; }
td.muted { color: var(--text-muted); font-size: 0.82rem; }

/* ── Status badges ── */
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.badge-assigned  { background: var(--status-assigned-bg);  color: var(--status-assigned-tx); }
.badge-missing   { background: var(--status-missing-bg);   color: var(--status-missing-tx); }
.badge-graded    { background: var(--status-graded-bg);    color: var(--status-graded-tx); }
.badge-turned-in { background: var(--status-turned-in-bg); color: var(--status-turned-in-tx); }
.badge-done      { background: var(--status-done-bg);      color: var(--status-done-tx); }
.badge-unknown   { background: var(--status-unknown-bg);   color: var(--status-unknown-tx); }

/* ── Empty state ── */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ── Week label ── */
.week-separator td {
  background: #f8f8fa;
  padding: 0.3rem 0.75rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border);
}

/* ── To Do grouped view ── */
.todo-class-header {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.75rem 0.75rem 0.4rem;
  border-bottom: 1px solid var(--border);
}

/* ── Attachment chip ── */
.attach-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── Tooltip ── */
[title] { cursor: help; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .main { padding: 1rem 0.75rem; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .class-summary h2 { font-size: 0.9rem; }
  table { font-size: 0.8rem; }
  td, th { padding: 0.4rem 0.5rem; }
  .demo-banner { font-size: 0.8rem; }
}

/* ── Print (To Do view) ── */
@media print {
  .demo-banner, nav, .page-header .btn, .stats-row { display: none; }
  .class-group { border: none; box-shadow: none; page-break-inside: avoid; }
  .class-summary { background: none; padding: 0.25rem 0; }
  body { background: white; }
}