/* ---------------------------------------------
   GradeFlow brand tokens (brandguidelines.md)
---------------------------------------------- */
:root {
  --gradeflow-blue: #2563EB;
  --gradeflow-blue-dark: #1D4ED8;
  --academic-navy: #1E3A5F;
  --success-green: #059669;
  --warning-amber: #D97706;
  --error-red: #DC2626;
  --soft-gray: #F3F4F6;
  --medium-gray: #9CA3AF;
  --light-blue: #DBEAFE;
  --white: #FFFFFF;

  --tint-green: rgba(5, 150, 105, 0.12);
  --tint-amber: rgba(217, 119, 6, 0.12);
  --tint-red: rgba(220, 38, 38, 0.12);
  --tint-blue: rgba(37, 99, 235, 0.10);

  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--soft-gray);
  color: var(--academic-navy);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0;
  color: var(--academic-navy);
  font-family: var(--font-ui);
}

h1 { font-size: 32px; font-weight: 600; line-height: 1.2; }
h2 { font-size: 24px; font-weight: 600; line-height: 1.3; }
h3 { font-size: 20px; font-weight: 500; line-height: 1.4; }
h4 { font-size: 16px; font-weight: 500; line-height: 1.4; margin: 0 0 4px; }

p { margin: 0; }

.small { font-size: 12px; line-height: 1.4; color: var(--medium-gray); }

a { color: var(--gradeflow-blue); }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Accessible focus state everywhere */
:focus-visible {
  outline: 2px solid var(--gradeflow-blue);
  outline-offset: 2px;
}

/* ---------------------------------------------
   Header
---------------------------------------------- */
.app-header {
  background: var(--white);
  border-bottom: 1px solid var(--soft-gray);
}

.app-header-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 24px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--gradeflow-blue);
}

.brand-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--gradeflow-blue);
}

/* ---------------------------------------------
   Page layout
---------------------------------------------- */
.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.page-intro {
  margin-bottom: 24px;
}

.page-subtitle {
  margin-top: 8px;
  max-width: 640px;
  color: var(--academic-navy);
  opacity: 0.75;
  font-size: 14px;
}

/* ---------------------------------------------
   Cards (brand component pattern)
---------------------------------------------- */
.card {
  background: var(--white);
  border: 1px solid var(--medium-gray);
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  padding: 16px;
}

/* ---------------------------------------------
   Summary strip
---------------------------------------------- */
.summary-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--white);
  border: 1px solid var(--medium-gray);
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  padding: 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.stat-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-icon.icon-red { background: var(--tint-red); color: var(--error-red); }
.stat-icon.icon-amber { background: var(--tint-amber); color: var(--warning-amber); }
.stat-icon.icon-green { background: var(--tint-green); color: var(--success-green); }

.stat-value {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--academic-navy);
}

.stat-label {
  font-size: 12px;
  color: var(--medium-gray);
  margin-top: 2px;
}

/* ---------------------------------------------
   Buttons (brand component pattern)
---------------------------------------------- */
.btn {
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
  padding: 10px 16px;
  min-width: 80px;
  min-height: 44px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--gradeflow-blue);
  color: var(--white);
  border-color: var(--gradeflow-blue);
}
.btn-primary:hover { background: var(--gradeflow-blue-dark); border-color: var(--gradeflow-blue-dark); }

.btn-secondary {
  background: var(--white);
  color: var(--gradeflow-blue);
  border-color: var(--gradeflow-blue);
}
.btn-secondary:hover { background: var(--light-blue); }

.btn-sm {
  min-width: 0;
  min-height: 36px;
  padding: 6px 12px;
  font-size: 13px;
}

/* ---------------------------------------------
   Table section / toolbar
---------------------------------------------- */
.table-section { padding: 0; overflow: hidden; }

.table-toolbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding: 16px;
  border-bottom: 1px solid var(--soft-gray);
  flex-wrap: wrap;
}

.toolbar-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toolbar-field label {
  font-size: 12px;
  font-weight: 500;
  color: var(--academic-navy);
}

.toolbar-field select {
  font-family: var(--font-ui);
  font-size: 14px;
  padding: 8px 10px;
  border: 1px solid var(--medium-gray);
  border-radius: 6px;
  background: var(--white);
  color: var(--academic-navy);
  min-height: 40px;
}

.table-scroll {
  overflow-x: auto;
}

/* ---------------------------------------------
   Table (brand component pattern)
---------------------------------------------- */
table {
  width: 100%;
  border-collapse: collapse;
  min-width: 780px;
}

thead th {
  background: var(--soft-gray);
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--academic-navy);
  padding: 10px 12px;
  white-space: nowrap;
  border-bottom: 1px solid var(--medium-gray);
}

thead th.align-right { text-align: right; }

.th-sort {
  background: none;
  border: none;
  font: inherit;
  font-weight: 600;
  color: var(--academic-navy);
  cursor: pointer;
  padding: 2px 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-height: 0;
}

.th-sort:hover { color: var(--gradeflow-blue); }

.sort-arrow {
  font-size: 10px;
  color: var(--medium-gray);
}

.th-sort[aria-sort="ascending"] .sort-arrow,
.th-sort[aria-sort="descending"] .sort-arrow {
  color: var(--gradeflow-blue);
}

tbody tr.ta-row {
  background: var(--white);
  border-bottom: 1px solid var(--soft-gray);
}

tbody tr.ta-row:nth-child(4n+3) {
  background: var(--soft-gray);
}

tbody tr.ta-row.is-expanded {
  background: var(--light-blue);
}

td {
  padding: 12px;
  vertical-align: middle;
  font-size: 14px;
  color: var(--academic-navy);
}

td.align-right { text-align: right; font-variant-numeric: tabular-nums; }

.ta-name { font-weight: 500; }
.ta-course { color: var(--academic-navy); opacity: 0.8; }

.expand-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--medium-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  padding: 0;
}
.expand-toggle:hover { color: var(--gradeflow-blue); background: var(--tint-blue); }
.expand-toggle svg { transition: transform 0.15s ease; }
.expand-toggle[aria-expanded="true"] svg { transform: rotate(90deg); }

/* ---------------------------------------------
   Pace bar
---------------------------------------------- */
.pace-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 160px;
}

.pace-bar {
  position: relative;
  height: 8px;
  border-radius: 4px;
  background: var(--soft-gray);
  overflow: visible;
}

.pace-bar-fill {
  height: 100%;
  border-radius: 4px;
}

.pace-bar-fill.severity-onTrack { background: var(--success-green); }
.pace-bar-fill.severity-paceCheck { background: var(--warning-amber); }
.pace-bar-fill.severity-needsCheckin { background: var(--error-red); }
.pace-bar-fill.severity-checkedIn { background: var(--gradeflow-blue); }

.pace-bar-avg {
  position: absolute;
  top: -3px;
  width: 2px;
  height: 14px;
  background: var(--academic-navy);
  opacity: 0.5;
}

.pace-caption { font-size: 12px; color: var(--medium-gray); }

/* ---------------------------------------------
   Signal icon badges
---------------------------------------------- */
.signal-icons {
  display: flex;
  gap: 6px;
}

.signal-icon {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--soft-gray);
  color: var(--academic-navy);
}

.signal-icon svg { width: 15px; height: 15px; }

.signal-icon[data-signal="self-flag"] { background: var(--tint-red); color: var(--error-red); }
.signal-icon[data-signal="capacity"] { background: var(--tint-blue); color: var(--gradeflow-blue); }
.signal-icon[data-signal="contest"] { background: var(--tint-amber); color: var(--warning-amber); }
.signal-icon[data-signal="cold-start"] { background: var(--soft-gray); color: var(--medium-gray); }

.no-signals { color: var(--medium-gray); font-size: 12px; }

/* ---------------------------------------------
   Status badge
---------------------------------------------- */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
}

.status-badge svg { width: 14px; height: 14px; flex-shrink: 0; }

.status-badge.severity-onTrack { background: var(--tint-green); color: var(--success-green); }
.status-badge.severity-paceCheck { background: var(--tint-amber); color: var(--warning-amber); }
.status-badge.severity-needsCheckin { background: var(--tint-red); color: var(--error-red); }
.status-badge.severity-checkedIn { background: var(--tint-blue); color: var(--gradeflow-blue); }

/* ---------------------------------------------
   Detail row
---------------------------------------------- */
tr.detail-row td {
  background: var(--white);
  padding: 0;
  border-bottom: 1px solid var(--soft-gray);
}

.detail-panel {
  padding: 16px 16px 20px 56px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.detail-block h4 { margin-bottom: 6px; }

.detail-block p {
  font-size: 13px;
  color: var(--academic-navy);
  opacity: 0.85;
}

.note-block {
  background: var(--soft-gray);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px;
  font-style: italic;
}

.detail-actions {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 4px;
  border-top: 1px dashed var(--medium-gray);
  margin-top: 4px;
}

.checked-in-note {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--success-green);
  font-size: 13px;
  font-weight: 500;
}
.checked-in-note svg { width: 16px; height: 16px; }

/* ---------------------------------------------
   Responsive
---------------------------------------------- */
@media (max-width: 720px) {
  .summary-strip { grid-template-columns: 1fr; }
  .detail-panel { grid-template-columns: 1fr; padding-left: 16px; }
}