/* ==========================================================================
   Tech Verse Exam — design system
   ONE flat, strong, dark language for every student-facing page.
   No glow · no blur · no gradients · no heavy shadows.

     1  Tokens (colour · spacing · radius · type · layout · motion)
     2  Base / reset
     3  Layout   container → page → page-head → section → card / grid / list
     4  Buttons   5  Cards   6  Badges   7  Forms   8  States   9  Stat tile   10 Tabs
     11 Modal · toast · table (shared with the admin panel — keep those selectors)
     12 Navigation: top bar · notification panel · drawer · bottom bar
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+Bengali:wght@600;700&family=Hind+Siliguri:wght@400;500;600;700&family=Noto+Sans+Bengali:wght@400;500;600&display=swap');

/* ==========================================================================
   1. Tokens
   ========================================================================== */
:root {
  /* surfaces & text */
  --bg: #0B0C12;
  --bg-elevated: #14151E;
  --bg-elevated-2: #1B1D29;
  --text-primary: #F2F1F8;
  --text-muted: #9B98B8;
  --border: rgba(230, 225, 255, 0.12);
  --border-strong: rgba(230, 225, 255, 0.22);

  /* ONE accent + four semantic colours */
  --accent: #6C5CE7;
  --accent-soft: #8B7CFF;
  --accent-teal: #1F9E8C;
  --accent-coral: #E15F52;
  --accent-green: #22A862;
  --accent-amber: #E8A33D;
  --green-text: #3FC283;   /* readable on its own tint */
  --teal-text: #35B8A5;

  /* tints (badge / highlight backgrounds) */
  --tint-accent: rgba(108, 92, 231, 0.16);
  --tint-coral: rgba(225, 95, 82, 0.14);
  --tint-amber: rgba(232, 163, 61, 0.14);
  --tint-green: rgba(34, 168, 98, 0.14);
  --tint-teal: rgba(31, 158, 140, 0.14);

  /* spacing scale — use ONLY these */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 20px; --sp-6: 24px; --sp-7: 32px;

  /* radius scale */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* typography */
  --font-display: 'Noto Serif Bengali', Georgia, serif;
  --font-body: 'Hind Siliguri', 'Segoe UI', sans-serif;
  --font-utility: 'Noto Sans Bengali', 'Hind Siliguri', sans-serif;
  --fs-xs: 0.75rem;     /* badge, metadata label            12px */
  --fs-sm: 0.8125rem;   /* metadata                          13px */
  --fs-md: 0.875rem;    /* supporting text, small buttons    14px */
  --fs-base: 0.9375rem; /* body copy inside cards            15px */
  --fs-lg: 1rem;        /* card title                        16px */
  --fs-xl: 1.125rem;    /* section title                     18px */
  --fs-stat: 1.5rem;    /* big numbers                       24px */
  --fs-page: 1.5rem;    /* page title (phones)               24px */

  /* layout */
  --container: 1180px;
  --gutter: 16px;
  --page-gap: 24px;
  --nav-h: 56px;
  --bottom-nav-h: 60px;

  /* motion */
  --t-fast: 0.14s;
}
@media (max-width: 360px) { :root { --gutter: 12px; } }
@media (min-width: 600px) { :root { --gutter: 24px; } }
@media (min-width: 901px) { :root { --gutter: 32px; --page-gap: 32px; --nav-h: 64px; --fs-page: 1.875rem; } }

/* ==========================================================================
   2. Base / reset
   ========================================================================== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  background: var(--bg); color: var(--text-primary);
  font-family: var(--font-body); font-size: 1rem; line-height: 1.6;
  min-height: 100vh; min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, select, textarea { font-family: inherit; font-size: 1rem; }   /* 16px: no zoom-on-focus on iOS */
ul, ol { list-style: none; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.3; overflow-wrap: break-word; }
[hidden] { display: none !important; }
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.mt-8 { margin-top: var(--sp-2); } .mt-16 { margin-top: var(--sp-4); } .mt-24 { margin-top: var(--sp-6); }
.mb-16 { margin-bottom: var(--sp-4); }

/* one focus ring for everything */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible,
summary:focus-visible, [tabindex]:focus-visible { outline: 2px solid var(--accent-soft); outline-offset: 2px; }

/* ==========================================================================
   3. Layout — container → page → page-head → section → card / grid / list
   ========================================================================== */
.site-body { padding-top: calc(var(--nav-h) + env(safe-area-inset-top, 0px)); }

.container {
  width: 100%; max-width: var(--container); margin-inline: auto;
  padding-inline: calc(var(--gutter) + env(safe-area-inset-left, 0px)) calc(var(--gutter) + env(safe-area-inset-right, 0px));
}
/* every student page is   <div class="container page"> … </div>   — same start line, same rhythm */
.page { display: flex; flex-direction: column; gap: var(--page-gap); padding-block: var(--sp-5) var(--sp-7); min-width: 0; }
.page > * { min-width: 0; }

/* page header: title + one-line description (+ optional action) */
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--sp-3) var(--sp-4); flex-wrap: wrap; }
.page-head-text { min-width: 0; flex: 1 1 260px; }
.page-head .page-title { font-size: var(--fs-page); line-height: 1.25; margin: 0; }
.page-head .page-desc { margin: var(--sp-1) 0 0; max-width: 64ch; font-size: var(--fs-md); color: var(--text-muted); }
.page-actions { display: flex; gap: var(--sp-2); flex-wrap: wrap; align-items: center; }

/* section: heading row + content */
.section { min-width: 0; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--sp-3); margin-bottom: var(--sp-3); }
.section-head-text { min-width: 0; }
.section-title { display: flex; align-items: center; gap: var(--sp-2); font-size: var(--fs-xl); line-height: 1.3; }
.section-title i { color: var(--accent-soft); font-size: 0.85em; }
.section-sub { margin-top: 2px; font-size: var(--fs-md); color: var(--text-muted); }
.section-link { display: inline-flex; align-items: center; gap: 6px; min-height: 36px; font-size: var(--fs-md); font-weight: 700; color: var(--accent-soft); white-space: nowrap; }
.section-link:hover { text-decoration: underline; }
.section-link i { font-size: 0.8em; }
.stack-sm { display: flex; flex-direction: column; gap: var(--sp-2); }
.stack-md { display: flex; flex-direction: column; gap: var(--sp-3); }

/* legacy admin header (admin.css re-declares it; kept compatible) */
.page-head h1 { margin-bottom: var(--sp-1); }
.page-head p { color: var(--text-muted); }

/* footer */
.site-footer { border-top: 1px solid var(--border); padding: var(--sp-4) 0; color: var(--text-muted); font-size: var(--fs-sm); }
.footer-inner { display: flex; justify-content: center; text-align: center; }

/* ==========================================================================
   4. Buttons  — one height, one radius, one weight
   ========================================================================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2);
  min-height: 44px; padding: 10px var(--sp-5);
  border: 1.5px solid transparent; border-radius: var(--radius-sm);
  font-size: var(--fs-base); font-weight: 700; line-height: 1.3; text-align: center;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}
.btn i { flex: none; font-size: 0.95em; }
.btn-block { width: 100%; }
.btn-sm { min-height: 36px; padding: 6px var(--sp-4); font-size: var(--fs-md); }
.site-body .btn-sm { min-height: 40px; }
.btn-icon { width: 44px; padding: 0; }
.btn-icon.btn-sm { width: 36px; }
.site-body .btn-icon.btn-sm { width: 40px; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #5B4BD6; }
.btn-secondary { background: var(--bg-elevated-2); border-color: var(--border-strong); color: var(--text-primary); }
.btn-secondary:hover { border-color: var(--accent-soft); }
.btn-outline { background: transparent; border-color: var(--border-strong); color: var(--text-primary); }
.btn-outline:hover { border-color: var(--accent-soft); color: var(--accent-soft); }
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { background: var(--bg-elevated-2); color: var(--text-primary); }
.btn-danger { background: transparent; border-color: rgba(225, 95, 82, 0.5); color: var(--accent-coral); }
.btn-danger:hover { background: var(--tint-coral); border-color: var(--accent-coral); }
.btn-teal { background: var(--accent-teal); color: #fff; }
.btn-teal:hover { background: #197F71; }
.btn-coral { background: var(--accent-coral); color: #fff; }
.btn-coral:hover { background: #C94E42; }
.btn:disabled, .btn[disabled], .btn[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; pointer-events: none; }
.spinner { width: 16px; height: 16px; border-radius: 50%; border: 2px solid rgba(255, 255, 255, 0.4); border-top-color: #fff; display: inline-block; animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ==========================================================================
   5. Cards — one background, one border, one radius, one padding
   ========================================================================== */
.card { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-md); padding: var(--sp-4); min-width: 0; }
@media (min-width: 600px) { .card { padding: var(--sp-5); } }
.card--flush { padding: 0; overflow: hidden; }
.card--interactive { transition: border-color var(--t-fast); }
.card--interactive:hover { border-color: var(--accent-soft); }
.card--highlight { border-color: rgba(139, 124, 255, 0.4); box-shadow: inset 0 3px 0 var(--accent); }
.card--danger { border-color: rgba(225, 95, 82, 0.45); }
.card--success { border-color: rgba(34, 168, 98, 0.45); }
.card--warning { border-color: rgba(232, 163, 61, 0.5); }
.card-head { display: flex; align-items: center; gap: var(--sp-3); margin-bottom: var(--sp-4); }
.card-title { font-size: var(--fs-lg); line-height: 1.3; }
.card-sub { font-size: var(--fs-sm); color: var(--text-muted); }
.card-icon { flex: none; width: 36px; height: 36px; display: grid; place-items: center; border-radius: var(--radius-sm); background: var(--tint-accent); color: var(--accent-soft); font-size: 0.95rem; }
.card-icon--amber { background: var(--tint-amber); color: var(--accent-amber); }
.card-icon--coral { background: var(--tint-coral); color: var(--accent-coral); }
.card-icon--green { background: var(--tint-green); color: var(--green-text); }
.card-icon--teal { background: var(--tint-teal); color: var(--teal-text); }
/* list group: rows separated by hairlines inside one card */
.list-card { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-md); overflow: hidden; }
.list-card > * + * { border-top: 1px solid var(--border); }

.user-avatar {
  flex: none; width: var(--av, 40px); height: var(--av, 40px); display: grid; place-items: center;
  border-radius: var(--radius-sm); background: var(--accent); color: #fff;
  font-family: var(--font-display); font-weight: 700; font-size: calc(var(--av, 40px) * 0.4); line-height: 1; letter-spacing: 0;
}

/* ==========================================================================
   6. Badges — ONE badge system. Status colours are defined here and nowhere else.
      LIVE · SOON · UPCOMING · OPEN · DONE · CLOSED  (+ pass / fail / accent / muted)
   ========================================================================== */
.badge {
  display: inline-flex; align-items: center; gap: 6px; min-height: 22px; padding: 2px var(--sp-2);
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--bg-elevated-2); color: var(--text-muted);
  font-size: var(--fs-xs); font-weight: 700; line-height: 1.4; letter-spacing: 0.2px; white-space: nowrap;
}
.badge i { font-size: 0.9em; }
.badge-live, .badge-coral, .badge-fail { color: var(--accent-coral); background: var(--tint-coral); border-color: rgba(225, 95, 82, 0.42); }
.badge-soon, .badge-amber { color: var(--accent-amber); background: var(--tint-amber); border-color: rgba(232, 163, 61, 0.42); }
.badge-upcoming, .badge-accent { color: var(--accent-soft); background: var(--tint-accent); border-color: rgba(139, 124, 255, 0.42); }
.badge-open, .badge-green, .badge-pass { color: var(--green-text); background: var(--tint-green); border-color: rgba(34, 168, 98, 0.45); }
.badge-done, .badge-teal { color: var(--teal-text); background: var(--tint-teal); border-color: rgba(31, 158, 140, 0.45); }
.badge-closed, .badge-muted { color: var(--text-muted); background: var(--bg-elevated-2); border-color: var(--border-strong); }
.badge-dot { display: inline-block; width: 8px; height: 8px; flex: none; border-radius: 50%; background: currentColor; animation: live-pulse 1.8s ease-out infinite; }
@keyframes live-pulse {
  0% { box-shadow: 0 0 0 0 rgba(225, 95, 82, 0.5); }
  70% { box-shadow: 0 0 0 6px rgba(225, 95, 82, 0); }
  100% { box-shadow: 0 0 0 0 rgba(225, 95, 82, 0); }
}

/* ==========================================================================
   7. Forms
   ========================================================================== */
.field { margin-bottom: var(--sp-4); min-width: 0; }
.field label { display: block; font-size: var(--fs-sm); font-weight: 600; color: var(--text-muted); margin-bottom: 6px; }
.field input, .field select, .field textarea {
  width: 100%; background: var(--bg-elevated-2); border: 1.5px solid var(--border-strong); color: var(--text-primary);
  padding: 10px var(--sp-3); border-radius: var(--radius-sm); transition: border-color var(--t-fast);
}
.site-body .field input, .site-body .field select { min-height: 44px; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--accent-soft); }
.field input::placeholder, .field textarea::placeholder { color: var(--text-muted); opacity: 0.65; }
.field input:disabled, .field input[readonly] { color: var(--text-muted); cursor: not-allowed; opacity: 0.75; }
.form-hint { display: block; font-size: var(--fs-xs); color: var(--text-muted); margin-top: 6px; }
/* read-only value: dashed border + lock, clearly "not editable" */
.field--readonly input { background: transparent; border-style: dashed; opacity: 1; padding-inline-end: 38px; }
.field-lock { position: relative; }
.field-lock > i { position: absolute; inset-inline-end: var(--sp-3); top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: 0.8rem; pointer-events: none; }
/* input + action side by side (Roll number → Sync) */
.input-group { display: flex; align-items: stretch; gap: var(--sp-2); }
.input-group > .field-lock, .input-group > input { flex: 1; min-width: 0; }
.input-group > .btn { flex: none; }
.input-group--tight { gap: var(--sp-1); }

/* ==========================================================================
   8. States — loading / empty / error look the same on every page
   ========================================================================== */
.ui-state, .exs-empty {
  display: flex; flex-direction: column; align-items: center; gap: var(--sp-2); padding: var(--sp-7) var(--sp-4); text-align: center;
  background: var(--bg-elevated); border: 1px dashed var(--border-strong); border-radius: var(--radius-md); color: var(--text-muted);
}
.ui-state > i, .exs-empty > i { font-size: 1.75rem; opacity: 0.8; margin: 0; }
.ui-state p, .exs-empty p { color: var(--text-primary); font-weight: 600; max-width: 46ch; }
.ui-state--error > i { color: var(--accent-coral); opacity: 1; }
.exs-loading { display: flex; align-items: center; justify-content: center; gap: var(--sp-3); color: var(--text-muted); padding: var(--sp-7) var(--sp-4); }
.exs-spinner { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--border-strong); border-top-color: var(--accent-soft); animation: spin 0.7s linear infinite; }
.exs-muted { color: var(--text-muted); }
.exs-small { font-size: var(--fs-sm); }
.exs-mt-8 { margin-top: var(--sp-2); }

.ui-skeleton { position: relative; overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius-md); background: var(--bg-elevated); }
.ui-skeleton::after { content: ""; position: absolute; inset: 0; transform: translateX(-100%); background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.045), transparent); animation: sk-shimmer 1.4s infinite; }
@keyframes sk-shimmer { to { transform: translateX(100%); } }
.ui-skeleton--hero { height: 220px; }
.ui-skeleton--card { height: 150px; margin-top: var(--sp-4); }
.ui-skeleton--row { height: 58px; margin-top: var(--sp-3); }

/* maintenance banner on the exam list */
.exs-site-notice { display: flex; gap: var(--sp-3); align-items: flex-start; margin: 0 0 var(--sp-4); padding: var(--sp-3) var(--sp-4); border-radius: var(--radius-md); background: var(--bg-elevated); border: 1px solid var(--accent-amber); border-inline-start-width: 4px; }
.exs-site-notice > i { color: var(--accent-amber); font-size: 1.1rem; margin-top: 2px; }
.exs-site-notice b { display: block; margin-bottom: 2px; }
.exs-site-notice p { color: var(--text-muted); font-size: var(--fs-md); line-height: 1.5; margin: 0; }

/* ==========================================================================
   9. Stat tile — the one "number + label" pattern (profile, performance, activity)
   ========================================================================== */
.stat-grid { display: grid; gap: var(--sp-3); grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (min-width: 900px) { .stat-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.stat-tile { display: flex; flex-direction: column; gap: 2px; min-width: 0; padding: var(--sp-3) var(--sp-4); background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-md); }
.stat-tile--icon { flex-direction: row; align-items: center; gap: var(--sp-3); }
.stat-icon { flex: none; width: 40px; height: 40px; display: grid; place-items: center; border-radius: var(--radius-sm); background: var(--tint-accent); color: var(--accent-soft); font-size: 1rem; }
.stat-icon--green { background: var(--tint-green); color: var(--green-text); }
.stat-icon--amber { background: var(--tint-amber); color: var(--accent-amber); }
.stat-icon--teal { background: var(--tint-teal); color: var(--teal-text); }
.stat-text { display: flex; flex-direction: column; min-width: 0; }
.stat-value { font-family: var(--font-display); font-size: var(--fs-stat); font-weight: 700; line-height: 1.2; font-variant-numeric: tabular-nums; }
.stat-label { font-size: var(--fs-sm); font-weight: 600; color: var(--text-muted); line-height: 1.35; overflow-wrap: break-word; }
.stat-hint { font-size: var(--fs-xs); color: var(--text-muted); }
.stat-tile.is-good .stat-value { color: var(--green-text); }

/* ==========================================================================
   10. Tabs (segmented, scroll sideways inside themselves — never the page)
   ========================================================================== */
.seg-tabs { display: flex; gap: var(--sp-2); overflow-x: auto; padding: 2px; scrollbar-width: none; max-width: 100%; }
.seg-tabs::-webkit-scrollbar { display: none; }
.seg-tab {
  flex: none; display: inline-flex; align-items: center; gap: var(--sp-2); min-height: 40px; padding: 0 var(--sp-4);
  border: 1.5px solid var(--border-strong); border-radius: var(--radius-sm);
  font-size: var(--fs-md); font-weight: 700; color: var(--text-muted);
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}
.seg-tab:hover { color: var(--text-primary); }
.seg-tab.is-on { background: var(--accent); border-color: var(--accent); color: #fff; }
.seg-tab em { padding: 0 7px; border-radius: var(--radius-sm); background: rgba(255, 255, 255, 0.14); font-size: var(--fs-xs); font-style: normal; line-height: 1.6; }

/* ==========================================================================
   11. Modal · toast · table  (the admin panel uses these — selectors kept)
   ========================================================================== */
.modal-overlay { position: fixed; inset: 0; z-index: 80; background: rgba(6, 6, 12, 0.72); display: flex; align-items: flex-start; justify-content: center; overflow-y: auto; padding: var(--sp-7) var(--sp-4); }
.modal-box { width: 100%; max-width: 640px; margin: auto; }
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--sp-4); }
.modal-close-btn { font-size: 1.1rem; color: var(--text-muted); }
.modal-close-btn:hover { color: var(--text-primary); }
.confirm-msg { color: var(--text-muted); margin-bottom: var(--sp-5); line-height: 1.6; }
.confirm-actions { display: flex; gap: var(--sp-3); }

#toast-root { position: fixed; bottom: var(--sp-5); right: var(--sp-5); z-index: 200; display: flex; flex-direction: column; gap: var(--sp-2); }
.toast { background: var(--bg-elevated-2); border: 1px solid var(--border-strong); border-inline-start: 3px solid var(--accent); color: var(--text-primary); padding: var(--sp-3) var(--sp-4); border-radius: var(--radius-sm); font-size: var(--fs-md); min-width: 220px; }
.toast.success { border-inline-start-color: var(--accent-green); }
.toast.error { border-inline-start-color: var(--accent-coral); }

.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-md); overflow: hidden; }
.data-table th, .data-table td { padding: var(--sp-3) 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.88rem; }
.data-table th { color: var(--text-muted); font-weight: 700; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.3px; background: var(--bg-elevated-2); }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover td { background: var(--bg-elevated-2); }
.empty-state { text-align: center; padding: 40px var(--sp-4); color: var(--text-muted); }
.empty-state .icon { font-size: 1.8rem; margin-bottom: var(--sp-2); color: var(--border-strong); }
.cell-title .t { font-weight: 600; }
.row-actions { display: flex; gap: 6px; justify-content: flex-end; }
.icon-btn { width: 32px; height: 32px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong); display: inline-flex; align-items: center; justify-content: center; color: var(--text-muted); }
.icon-btn:hover { color: var(--text-primary); border-color: var(--accent-soft); }
.icon-btn.danger:hover { color: #fff; background: var(--accent-coral); border-color: var(--accent-coral); }
@media (max-width: 700px) {
  .table-wrap { overflow: visible; }
  .data-table thead { display: none; }
  .data-table, .data-table tbody, .data-table tr, .data-table td { display: block; width: 100%; }
  .data-table tbody tr { border: 1px solid var(--border); border-radius: var(--radius-md); padding: 4px 14px; margin-bottom: var(--sp-3); background: var(--bg-elevated); }
  .data-table td { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 10px 0; border-bottom: 1px solid var(--border); }
  .data-table td:last-child { border-bottom: none; }
  .data-table td::before { content: attr(data-label); font-size: 0.72rem; font-weight: 700; color: var(--text-muted); }
  .data-table td[data-label=""]::before { display: none; }
  .data-table td[data-label=""] { justify-content: flex-end; }
}

/* ==========================================================================
   12. Navigation
   12a  Top bar      desktop: logo | Home Exams Schedule My Activity | bell · admin · profile
                     phone:   logo | bell · menu
   ========================================================================== */
.topnav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 60;
  background: var(--bg-elevated); border-bottom: 1px solid var(--border-strong);
  padding-top: env(safe-area-inset-top, 0px);
}
.topnav-inner { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: var(--sp-4); height: var(--nav-h); }
.brand { display: flex; align-items: center; justify-self: start; min-height: 44px; }
.brand-logo { height: 32px; width: auto; display: block; flex-shrink: 0; }
.nav-links { grid-column: 2; display: flex; align-items: center; gap: var(--sp-1); }
.nav-tools { grid-column: 3; justify-self: end; display: flex; align-items: center; gap: var(--sp-2); min-width: 0; }

/* one link style, one active style — used by desktop links, drawer items, profile chip */
.nav-link {
  display: inline-flex; align-items: center; height: 40px; padding: 0 var(--sp-4);
  border: 1px solid transparent; border-radius: var(--radius-sm);
  font-size: var(--fs-md); font-weight: 600; color: var(--text-muted); white-space: nowrap;
  transition: background var(--t-fast), color var(--t-fast);
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-elevated-2); }
.nav-link[aria-current="page"] { color: var(--accent-soft); background: var(--tint-accent); border-color: rgba(139, 124, 255, 0.3); }

/* square icon buttons: bell + menu */
.nav-icon-btn {
  position: relative; flex: none; width: 40px; height: 40px; display: grid; place-items: center;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: transparent;
  color: var(--text-muted); font-size: 1rem; transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}
.nav-icon-btn:hover, .nav-icon-btn[aria-expanded="true"] { color: var(--text-primary); border-color: var(--accent-soft); background: var(--bg-elevated-2); }
.nav-icon-btn.is-active { color: var(--accent-soft); border-color: rgba(139, 124, 255, 0.5); background: var(--tint-accent); }
.nav-bell-wrap { position: relative; }
.nav-bell-badge {
  position: absolute; top: -6px; right: -6px; min-width: 18px; height: 18px; padding: 0 5px;
  display: grid; place-items: center; border-radius: 999px; border: 2px solid var(--bg-elevated);
  background: var(--accent-coral); color: #fff; font-size: 0.6875rem; font-weight: 700; line-height: 1; pointer-events: none;
}
.nav-menu-btn { display: none; }

.nav-admin { gap: 6px; }
.nav-user-chip {
  display: inline-flex; align-items: center; gap: var(--sp-2); height: 40px; max-width: 200px; padding: 0 var(--sp-3) 0 6px;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: var(--bg-elevated-2);
  color: var(--text-muted); font-size: var(--fs-md); font-weight: 600; white-space: nowrap;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}
.nav-user-chip:hover { color: var(--text-primary); border-color: var(--accent-soft); }
.nav-user-chip[aria-current="page"] { color: var(--accent-soft); border-color: rgba(139, 124, 255, 0.5); background: var(--tint-accent); }
.nav-user-chip .user-avatar { --av: 28px; }
.nav-user-name { min-width: 0; overflow: hidden; text-overflow: ellipsis; }

@media (min-width: 901px) and (max-width: 1099px) {   /* compact desktop: avatar only */
  .nav-user-name, .nav-admin-label { display: none; }
  .nav-user-chip { padding: 0 6px; }
  .nav-admin { width: 40px; padding: 0; }
  .nav-link { padding: 0 var(--sp-3); }
}

/* 12b  Notification panel — dropdown on desktop, a sheet between the top bar and the bottom bar on phones */
.bell-panel {
  position: absolute; right: 0; top: calc(100% + var(--sp-3)); z-index: 90;
  width: min(380px, calc(100vw - 2 * var(--gutter))); max-height: min(70vh, 560px);
  display: flex; flex-direction: column; overflow: hidden;
  background: var(--bg-elevated); border: 1px solid var(--border-strong); border-radius: var(--radius-md);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4);
}
.bell-head { flex: none; display: flex; align-items: center; gap: var(--sp-2); padding: var(--sp-3) var(--sp-4); border-bottom: 1px solid var(--border); }
.bell-head b { font-family: var(--font-display); font-size: var(--fs-lg); margin-inline-end: auto; }
.bell-markall { min-height: 36px; padding: 0 var(--sp-2); font-size: var(--fs-sm); font-weight: 700; color: var(--accent-soft); }
.bell-markall:disabled { color: var(--text-muted); opacity: 0.6; cursor: default; }
.bell-list { flex: 1 1 auto; min-height: 0; overflow-y: auto; overscroll-behavior: contain; }
.bell-list .ui-skeleton { margin: var(--sp-3) var(--sp-4); }
.bell-item { position: relative; display: flex; gap: var(--sp-3); padding: var(--sp-3) var(--sp-4); border-bottom: 1px solid var(--border); }
.bell-item:hover { background: var(--bg-elevated-2); }
.bell-item.is-read { opacity: 0.65; }
.bell-ico { flex: none; width: 32px; height: 32px; display: grid; place-items: center; border-radius: var(--radius-sm); background: var(--bg-elevated-2); color: var(--accent-soft); font-size: 0.85rem; }
.bell-item--urgent .bell-ico, .bell-item--live .bell-ico { background: var(--accent-coral); color: #fff; }
.bell-item--important .bell-ico, .bell-item--soon .bell-ico { background: var(--tint-amber); color: var(--accent-amber); }
.bell-body { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.bell-body b { font-size: var(--fs-md); line-height: 1.35; overflow-wrap: break-word; }
.bell-body span { font-size: var(--fs-sm); color: var(--text-muted); overflow-wrap: break-word; }
.bell-body time { font-size: var(--fs-xs); color: var(--text-muted); }
.bell-unread { flex: none; align-self: center; width: 8px; height: 8px; border-radius: 50%; background: var(--accent-soft); }
.bell-empty { display: flex; flex-direction: column; align-items: center; gap: var(--sp-2); padding: var(--sp-7) var(--sp-4); color: var(--text-muted); text-align: center; font-size: var(--fs-md); }
.bell-empty i { font-size: 1.5rem; opacity: 0.7; }
.bell-foot { flex: none; display: flex; align-items: center; justify-content: center; gap: var(--sp-2); min-height: 48px; border-top: 1px solid var(--border); font-size: var(--fs-md); font-weight: 700; color: var(--accent-soft); }
.bell-foot:hover { background: var(--bg-elevated-2); }

/* 12c  Drawer — secondary navigation + account (Home/Exams/Schedule/Activity/Profile live in the bottom bar) */
.nav-drawer-backdrop { display: none; position: fixed; inset: 0; z-index: 70; background: rgba(6, 6, 14, 0.65); opacity: 0; transition: opacity 0.22s; }
.nav-drawer-backdrop.open { display: block; opacity: 1; }
.nav-drawer {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 75; width: min(320px, 88vw);
  display: flex; flex-direction: column; overflow: hidden;
  background: var(--bg-elevated); border-left: 1px solid var(--border-strong);
  padding-top: env(safe-area-inset-top, 0px);
  transform: translateX(100%); visibility: hidden;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), visibility 0s linear 0.25s;
}
.nav-drawer.open { transform: translateX(0); visibility: visible; transition-delay: 0s; }
.nav-drawer-head { flex: none; display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); padding: var(--sp-4); border-bottom: 1px solid var(--border); }
.nav-drawer-user { display: flex; align-items: center; gap: var(--sp-3); min-width: 0; flex: 1; }
.nav-drawer-user .user-avatar { --av: 44px; border-radius: var(--radius-md); }
.nav-drawer-user-info { min-width: 0; }
.nav-drawer-user-name { font-weight: 700; font-size: var(--fs-base); line-height: 1.3; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-drawer-user-email { font-size: var(--fs-sm); color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-drawer-nav { flex: 1; min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: var(--sp-3); display: flex; flex-direction: column; gap: 2px; }
.nav-drawer-label { margin: var(--sp-3) var(--sp-3) var(--sp-1); font-size: var(--fs-xs); font-weight: 700; letter-spacing: 0.6px; text-transform: uppercase; color: var(--text-muted); }
.nav-drawer-label:first-child { margin-top: var(--sp-1); }
.nav-drawer-item {
  display: flex; align-items: center; gap: var(--sp-3); min-height: 48px; padding: 6px var(--sp-3);
  border: 1px solid transparent; border-radius: var(--radius-sm);
  font-size: var(--fs-base); font-weight: 600; color: var(--text-primary);
  transition: background var(--t-fast), color var(--t-fast);
}
.nav-drawer-item:hover { background: var(--bg-elevated-2); }
.nav-drawer-item-icon { flex: none; width: 32px; height: 32px; display: grid; place-items: center; border-radius: var(--radius-sm); background: var(--bg-elevated-2); border: 1px solid var(--border); color: var(--text-muted); font-size: 0.85rem; }
.nav-drawer-item-arrow { margin-inline-start: auto; font-size: 0.7rem; color: var(--text-muted); }
.nav-drawer-item[aria-current="page"] { color: var(--accent-soft); background: var(--tint-accent); border-color: rgba(139, 124, 255, 0.3); }
.nav-drawer-item[aria-current="page"] .nav-drawer-item-icon { color: var(--accent-soft); border-color: transparent; background: transparent; }
.nav-drawer-footer { flex: none; padding: var(--sp-3) var(--sp-4) calc(var(--sp-4) + env(safe-area-inset-bottom, 0px)); border-top: 1px solid var(--border); }

/* 12d  Phone bottom bar — Home · Exams · Schedule · Activity · Profile */
.bottom-nav { display: none; }

@media (max-width: 900px) {
  .topnav-inner { display: flex; justify-content: space-between; }
  .nav-links, .nav-user-chip, .nav-admin { display: none; }
  .nav-menu-btn { display: grid; }
  .nav-icon-btn { width: 44px; height: 44px; }

  .bell-panel {   /* sits between the top bar and the bottom bar: never behind it, never wider than the screen */
    position: fixed; top: calc(var(--nav-h) + env(safe-area-inset-top, 0px) + var(--sp-2));
    left: calc(var(--gutter) + env(safe-area-inset-left, 0px)); right: calc(var(--gutter) + env(safe-area-inset-right, 0px)); width: auto;
    max-height: calc(100vh - var(--nav-h) - var(--bottom-nav-h) - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px) - var(--sp-6));
    max-height: calc(100dvh - var(--nav-h) - var(--bottom-nav-h) - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px) - var(--sp-6));
  }

  .bottom-nav {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 55;
    display: grid; grid-template-columns: repeat(5, minmax(0, 1fr));
    background: var(--bg-elevated); border-top: 1px solid var(--border-strong);
    padding: 0 env(safe-area-inset-right, 0px) env(safe-area-inset-bottom, 0px) env(safe-area-inset-left, 0px);
  }
  .bn-item {
    position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
    min-height: var(--bottom-nav-h); padding: 6px 2px; font-size: var(--fs-xs); font-weight: 600; color: var(--text-muted);
    transition: color var(--t-fast);
  }
  .bn-icon { width: 40px; height: 26px; display: grid; place-items: center; border-radius: var(--radius-sm); font-size: 1.05rem; transition: background var(--t-fast); }
  .bn-item[aria-current="page"] { color: var(--accent-soft); }
  .bn-item[aria-current="page"] .bn-icon { background: var(--tint-accent); }
  .bn-item[aria-current="page"]::before { content: ""; position: absolute; top: 0; left: 24%; right: 24%; height: 3px; border-radius: 0 0 3px 3px; background: var(--accent-soft); }

  body.has-bottom-nav { padding-bottom: calc(var(--bottom-nav-h) + env(safe-area-inset-bottom, 0px)); }
  body.has-bottom-nav #toast-root { bottom: calc(var(--bottom-nav-h) + var(--sp-4) + env(safe-area-inset-bottom, 0px)); right: var(--sp-3); left: var(--sp-3); align-items: stretch; }
  /* while an exam is being taken nothing but the exam is tappable */
  body.exam-taking .bottom-nav { display: none; }
  body.exam-taking.has-bottom-nav { padding-bottom: 0; }
}

/* ==========================================================================
   Print + reduced motion
   ========================================================================== */
@media print {
  #topnav-root, .site-footer, .exs-no-print, #q-prev, #q-next { display: none !important; }
  body { background: #fff; color: #000; }
  .exs-review-list { color: #000; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}