/* ============================================================
   semester.css — Semester list, history, and GPA sidebar styles
   ============================================================ */

/* ----------------------------------------------------------
   Page containers
   ---------------------------------------------------------- */

.semester-list-page {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--spacing-6) var(--spacing-4);
}

.semester-history-page {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--spacing-6) var(--spacing-4);
}

/* ----------------------------------------------------------
   Page header
   ---------------------------------------------------------- */

.page-header {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-6);
  gap: var(--spacing-3);
}

/* ----------------------------------------------------------
   Cumulative GPA banner
   ---------------------------------------------------------- */

.cumulative-gpa-banner {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--spacing-4);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4) var(--spacing-6);
  margin-bottom: var(--spacing-6);
}

.cumulative-label {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.cumulative-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1;
}

/* ----------------------------------------------------------
   Semesters grid
   ---------------------------------------------------------- */

.semesters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-4);
}

/* ----------------------------------------------------------
   Semester card
   ---------------------------------------------------------- */

.semester-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.semester-card:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.12);
}

.semester-card--active {
  border-color: var(--color-primary);
}

/* ----------------------------------------------------------
   Semester card header
   ---------------------------------------------------------- */

.semester-card-header {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--spacing-2);
}

.semester-name {
  font-weight: 600;
  color: var(--color-text-primary);
  font-size: 1rem;
}

.semester-meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-1);
}

.semester-gpa {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-align: right;
  white-space: nowrap;
}

/* ----------------------------------------------------------
   Goal progress bar (inside semester card)
   ---------------------------------------------------------- */

.goal-bar-wrap {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--spacing-2);
  margin-top: var(--spacing-3);
}

.goal-bar-track {
  flex: 1;
  height: 6px;
  background: var(--color-bg-elevated);
  border-radius: 9999px;
  overflow: hidden;
}

.goal-bar-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 9999px;
  transition: width 0.4s ease;
}

.goal-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* ----------------------------------------------------------
   Semester card actions
   ---------------------------------------------------------- */

.semester-card-actions {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-2);
  margin-top: var(--spacing-3);
}

/* ----------------------------------------------------------
   Skeleton card (shimmer animation handled externally)
   ---------------------------------------------------------- */

.skeleton-card {
  /* shimmer animation is applied via global utility class */
}

/* ----------------------------------------------------------
   History summary card
   ---------------------------------------------------------- */

.history-summary-card {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  gap: var(--spacing-6);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4) var(--spacing-6);
  margin-bottom: var(--spacing-4);
  flex-wrap: wrap;
}

.history-stat {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.history-stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.history-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1;
}

/* ----------------------------------------------------------
   History chart card
   ---------------------------------------------------------- */

.history-chart-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4) var(--spacing-6);
  margin-bottom: var(--spacing-4);
}

.history-chart-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-4);
}

.history-chart {
  display: flex;
  flex-direction: row;
  align-items: flex-end;
  gap: var(--spacing-3);
  height: 160px;
  overflow-x: auto;
  padding-bottom: var(--spacing-1);
}

.history-bar-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
}

.history-bar-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  justify-content: flex-end;
  position: relative;
}

.history-bar-value {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  white-space: nowrap;
}

.history-bar {
  min-height: 4px;
  width: 28px;
  border-radius: 4px 4px 0 0;
  background: var(--color-primary);
  transition: height 0.4s ease;
}

/* Grade-colored bars */
.history-bar.grade-a {
  background: #34D399;
  color: inherit;
}

.history-bar.grade-b {
  background: #60A5FA;
  color: inherit;
}

.history-bar.grade-c {
  background: #FBBF24;
  color: inherit;
}

.history-bar.grade-d {
  background: #FB923C;
  color: inherit;
}

.history-bar.grade-f {
  background: #F87171;
  color: inherit;
}

/* Support nesting: parent has grade class, child is .history-bar */
.grade-a .history-bar {
  background: #34D399;
}

.grade-b .history-bar {
  background: #60A5FA;
}

.grade-c .history-bar {
  background: #FBBF24;
}

.grade-d .history-bar {
  background: #FB923C;
}

.grade-f .history-bar {
  background: #F87171;
}

.history-bar-label {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  margin-top: 4px;
  white-space: nowrap;
  text-align: center;
}

/* ----------------------------------------------------------
   History table card
   ---------------------------------------------------------- */

.history-table-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4) var(--spacing-6);
  margin-bottom: var(--spacing-4);
}

.history-table-header {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-2);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding-bottom: var(--spacing-3);
  border-bottom: 1px solid var(--color-border);
}

.history-table-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-2);
  padding: var(--spacing-3) 0;
  border-bottom: 1px solid var(--color-border);
  transition: background 0.15s ease;
  border-radius: var(--radius-sm);
}

.history-table-row:last-child {
  border-bottom: none;
}

.history-table-row:hover {
  background: var(--color-bg-elevated);
}

.history-sem-name {
  font-weight: 500;
  color: var(--color-text-primary);
}

.history-gpa {
  font-weight: 600;
  color: var(--color-text-primary);
}

.history-goal {
  color: var(--color-text-muted);
}

.history-empty {
  text-align: center;
  color: var(--color-text-muted);
  padding: var(--spacing-8) var(--spacing-4);
  font-size: 0.875rem;
}

/* ----------------------------------------------------------
   GPA sidebar — semester section
   ---------------------------------------------------------- */

.gpa-semester-section {
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border);
}

/* ----------------------------------------------------------
   GPA goal bar (sidebar)
   ---------------------------------------------------------- */

.gpa-goal-bar-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  margin-top: var(--spacing-2);
}

.gpa-goal-label {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.gpa-goal-track {
  height: 6px;
  background: var(--color-bg-elevated);
  border-radius: 9999px;
  overflow: hidden;
}

.gpa-goal-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 9999px;
  transition: width 0.4s ease;
}

.gpa-goal-fill.gpa-goal-green {
  background: var(--color-success);
}

.gpa-goal-fill.gpa-goal-yellow {
  background: var(--color-warning);
}

.gpa-goal-fill.gpa-goal-red {
  background: var(--color-danger);
}

.gpa-goal-pct {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-align: right;
}

/* ----------------------------------------------------------
   Form utilities (modal)
   ---------------------------------------------------------- */

.form-row {
  display: flex;
  flex-direction: row;
  gap: var(--spacing-3);
  align-items: flex-start;
}

.form-row > * {
  flex: 1;
}

.form-label-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  display: inline;
  margin-left: var(--spacing-1);
}