/* ============================================================
   STUDY METRICS — Student Dashboard
   css/dashboard.css  |  Phase 7.1
   Scoped to .db-* prefix. Zero overrides to existing rules.
   All values from existing CSS custom properties.
   ============================================================ */

/* ── Section nav ────────────────────────────────────────────── */
.db-section-nav {
  position: sticky;
  top: 68px;
  z-index: 40;
  background: color-mix(in oklch, var(--bg) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
}
.db-section-nav .wrap {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.db-section-nav .wrap::-webkit-scrollbar { display: none; }

.db-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 14px 18px;
  font-size: var(--step-sm);
  font-weight: 500;
  color: var(--ink-3);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
  background: none;
  border-radius: 0;
  cursor: pointer;
}
.db-nav-btn svg { width: 14px; height: 14px; }
.db-nav-btn:hover { color: var(--ink); }
.db-nav-btn.active {
  color: var(--accent-strong);
  border-bottom-color: var(--accent-strong);
}

/* ── Page body ──────────────────────────────────────────────── */
.db-body {
  padding: var(--s7) 0 var(--s9);
  display: flex;
  flex-direction: column;
  gap: var(--s7);
}

/* ── Section wrappers ───────────────────────────────────────── */
.db-section {
  scroll-margin-top: 120px;
}
.db-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--s5);
  gap: var(--s4);
}
.db-section-head h2 {
  font-size: var(--step-lg);
  letter-spacing: -.02em;
}
.db-section-head .db-section-link {
  font-size: var(--step-sm);
  font-weight: 600;
  color: var(--accent-strong);
  display: flex;
  align-items: center;
  gap: 4px;
}
.db-section-head .db-section-link svg { width: 13px; height: 13px; }
.db-section-head .db-section-link:hover { opacity: .75; }

/* ── Welcome card ───────────────────────────────────────────── */
.db-welcome-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  overflow: hidden;
  position: relative;
}
.db-welcome-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-dim) 0%, transparent 55%);
  pointer-events: none;
}
.db-welcome-inner {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--s6);
  padding: var(--s7);
  flex-wrap: wrap;
}
.db-welcome-text { flex: 1; min-width: 240px; }
.db-greeting {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-xl);
  letter-spacing: -.025em;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: var(--s3);
  flex-wrap: wrap;
}
.db-name { color: var(--accent-strong); }
.db-name-edit {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  color: var(--ink-3);
  border-radius: var(--r-sm);
  transition: color .15s, background .15s;
}
.db-name-edit svg { width: 15px; height: 15px; }
.db-name-edit:hover { color: var(--accent-strong); background: var(--accent-dim); }
.db-date {
  font-size: var(--step-sm);
  color: var(--ink-3);
  margin-top: var(--s2);
}
.db-motivation {
  font-size: var(--step-sm);
  color: var(--ink-2);
  margin-top: var(--s4);
  padding: var(--s3) var(--s4);
  background: var(--surface-2);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-md);
  display: inline-block;
}

/* ── Stat cards (in welcome) ────────────────────────────────── */
.db-stats-bar {
  display: flex;
  gap: var(--s4);
  align-items: flex-start;
  flex-wrap: wrap;
}
.db-stat-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--s4) var(--s5);
  display: flex;
  align-items: center;
  gap: var(--s4);
  min-width: 200px;
}
.db-stat-ring {
  position: relative;
  flex-shrink: 0;
  width: 72px;
  height: 72px;
}
.db-stat-ring svg {
  width: 72px;
  height: 72px;
}
.db-stat-ring-val {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.db-stat-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -.02em;
  color: var(--ink);
}
.db-stat-info { flex: 1; }
.db-stat-label {
  font-size: var(--step-sm);
  font-weight: 600;
  color: var(--ink);
}
.db-stat-sub {
  font-size: var(--step-xs);
  color: var(--ink-3);
  margin-top: 3px;
}
.db-stat-badge {
  font-size: var(--step-xs);
  font-weight: 600;
  margin-top: var(--s2);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.db-stat-empty {
  display: flex;
  align-items: center;
}

/* ── Two-column layout ──────────────────────────────────────── */
.db-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s5);
  align-items: start;
}

/* ── GPA / CGPA history panels ──────────────────────────────── */
.db-gpa-summary {
  display: flex;
  gap: var(--s5);
  align-items: flex-start;
  flex-wrap: wrap;
}
.db-gpa-ring-wrap {
  position: relative;
  flex-shrink: 0;
  width: 100px;
  height: 100px;
}
.db-gpa-ring-wrap svg {
  width: 100px;
  height: 100px;
}
.db-gpa-ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
}
.db-gpa-big {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -.03em;
  line-height: 1;
  color: var(--ink);
}
.db-gpa-sub {
  font-size: var(--step-xs);
  color: var(--ink-3);
}
.db-gpa-details { flex: 1; min-width: 0; }
.db-gpa-label-row {
  display: flex;
  align-items: center;
  gap: var(--s3);
  margin-bottom: var(--s3);
  flex-wrap: wrap;
}
.db-gpa-standing {
  font-weight: 700;
  font-size: var(--step-sm);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.db-gpa-meta {
  font-size: var(--step-xs);
  color: var(--ink-3);
}

/* Course rows */
.db-course-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.db-course-row {
  display: grid;
  grid-template-columns: 1fr 44px 1fr 44px;
  align-items: center;
  gap: var(--s2);
  font-size: var(--step-xs);
}
.db-course-name {
  color: var(--ink-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.db-course-grade {
  font-weight: 600;
  color: var(--ink);
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.db-course-bar {
  height: 6px;
  background: var(--border);
  border-radius: 20px;
  overflow: hidden;
}
.db-course-bar-fill {
  height: 100%;
  border-radius: 20px;
  transition: width .6s var(--ease);
}
.db-course-pts {
  font-variant-numeric: tabular-nums;
  color: var(--ink-3);
  text-align: right;
}
.db-course-more {
  font-size: var(--step-xs);
  color: var(--ink-3);
  text-align: center;
  padding: var(--s2) 0;
}
.db-panel-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: var(--step-sm);
  font-weight: 600;
  color: var(--accent-strong);
  margin-top: var(--s4);
  transition: gap .16s var(--ease);
}
.db-panel-link:hover { gap: 9px; }
.db-panel-link svg { width: 14px; height: 14px; }

/* ── Recent calculations grid ───────────────────────────────── */
.db-calcs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(220px, 100%), 1fr));
  gap: var(--s3);
}
.db-calc-card {
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: var(--s4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  transition: transform .18s var(--ease), border-color .18s, box-shadow .18s;
}
.db-calc-card:hover {
  transform: translateY(-2px);
  border-color: var(--ink-3);
  box-shadow: var(--shadow);
}
.db-calc-indicator {
  width: 4px;
  height: 44px;
  border-radius: 4px;
  flex-shrink: 0;
}
.db-calc-body { flex: 1; min-width: 0; }
.db-calc-tool {
  font-size: var(--step-xs);
  color: var(--ink-3);
  margin-bottom: 2px;
}
.db-calc-result {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-md);
  letter-spacing: -.02em;
  color: var(--ink);
}
.db-calc-sub {
  font-size: var(--step-xs);
  color: var(--ink-3);
  margin-top: 1px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.db-calc-arrow {
  color: var(--ink-3);
  flex-shrink: 0;
}
.db-calc-arrow svg { width: 14px; height: 14px; }

/* ── Recently visited ───────────────────────────────────────── */
.db-visits-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.db-visit-row {
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: 10px var(--s4);
  border-radius: var(--r-md);
  transition: background .15s;
}
.db-visit-row:hover { background: var(--surface-2); }
.db-visit-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}
.db-visit-name {
  flex: 1;
  font-size: var(--step-sm);
  font-weight: 500;
  color: var(--ink);
}
.db-visit-time {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--step-xs);
  color: var(--ink-3);
  flex-shrink: 0;
}
.db-visit-time svg { width: 12px; height: 12px; }
.db-visit-arrow {
  color: var(--border);
  flex-shrink: 0;
  transition: color .15s, transform .15s var(--ease);
}
.db-visit-arrow svg { width: 14px; height: 14px; }
.db-visit-row:hover .db-visit-arrow {
  color: var(--accent-strong);
  transform: translateX(3px);
}

/* ── Favorites ──────────────────────────────────────────────── */
.db-fav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(200px, 100%), 1fr));
  gap: var(--s3);
}
.db-fav-card {
  display: flex;
  align-items: center;
  background: var(--accent-dim);
  border: 1px solid oklch(.6 .19 32 / .2);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: box-shadow .18s;
}
.db-fav-card:hover { box-shadow: 0 2px 12px oklch(.6 .19 32 / .15); }
.db-fav-link {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px var(--s4);
  min-width: 0;
}
.db-fav-name {
  font-size: var(--step-sm);
  font-weight: 600;
  color: var(--accent-strong);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.db-fav-arrow { color: var(--accent-strong); opacity: .5; }
.db-fav-arrow svg { width: 13px; height: 13px; }
.db-fav-star {
  padding: 11px var(--s3);
  color: var(--ink-3);
  flex-shrink: 0;
  transition: color .15s;
  border-left: 1px solid oklch(.6 .19 32 / .15);
}
.db-fav-star svg { width: 15px; height: 15px; }
.db-fav-star.active { color: var(--gold); }
.db-fav-star:hover { color: var(--accent-strong); }

/* ── Quick Access ───────────────────────────────────────────── */
.db-qa-group { margin-bottom: var(--s6); }
.db-qa-cat {
  font-size: var(--step-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--ink-3);
  margin-bottom: var(--s3);
}
.db-qa-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(180px, 100%), 1fr));
  gap: var(--s2);
}
.db-qa-card {
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color .15s, box-shadow .15s;
}
.db-qa-card:hover {
  border-color: var(--ink-3);
  box-shadow: 0 2px 8px oklch(.4 .02 55 / .06);
}
.db-qa-link {
  flex: 1;
  padding: 9px var(--s3);
  min-width: 0;
}
.db-qa-name {
  font-size: var(--step-sm);
  font-weight: 500;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}
.db-qa-star {
  padding: 9px var(--s3);
  color: var(--border);
  flex-shrink: 0;
  border-left: 1px solid var(--border-soft);
  transition: color .15s, background .15s;
}
.db-qa-star svg { width: 14px; height: 14px; }
.db-qa-star:hover { color: var(--gold); background: var(--surface-2); }
.db-qa-star.active { color: var(--gold); }

/* ── Empty state ────────────────────────────────────────────── */
.db-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--s3);
  padding: var(--s7) var(--s5);
  text-align: center;
}
.db-empty-icon {
  width: 40px;
  height: 40px;
  color: var(--border);
}
.db-empty-icon svg { width: 40px; height: 40px; }
.db-empty-msg {
  font-weight: 600;
  font-size: var(--step-md);
  color: var(--ink-2);
}
.db-empty-sub {
  font-size: var(--step-sm);
  color: var(--ink-3);
  max-width: 36ch;
  line-height: 1.5;
}

/* ── Settings strip ─────────────────────────────────────────── */
.db-settings-strip {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--s3);
  padding-top: var(--s4);
  border-top: 1px solid var(--border-soft);
  margin-top: var(--s7);
}
.db-settings-strip p {
  flex: 1;
  font-size: var(--step-sm);
  color: var(--ink-3);
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 860px) {
  .db-cols { grid-template-columns: 1fr; }
  .db-welcome-inner { padding: var(--s5); }
  .db-stats-bar { gap: var(--s3); }
  .db-stat-card { min-width: 0; flex: 1; }
  .db-greeting { font-size: var(--step-lg); }
}

@media (max-width: 560px) {
  .db-nav-btn { padding: 12px 12px; font-size: var(--step-xs); }
  .db-calcs-grid { grid-template-columns: 1fr; }
  .db-fav-grid { grid-template-columns: 1fr; }
  .db-qa-grid { grid-template-columns: 1fr 1fr; }
  .db-stat-card { min-width: 100%; }
  .db-stats-bar { flex-direction: column; }
  .db-gpa-summary { flex-direction: column; align-items: center; text-align: center; }
  .db-gpa-label-row { justify-content: center; }
}