/* ═════════════════════════════════════════════════════════
   refresh.css — loaded after styles.css on every page.
   Overrides the flat look without moving any layout:
   · the page sits on a near-solid subject color with a live
     three.js scene (js/bg3d.js) instead of gradients
   · content surfaces are frosted panels with layered shadows;
     no one-sided accent strips — accents live in icon chips
   · text that sits directly on the scene is light
   ═════════════════════════════════════════════════════════ */
@font-face {
  font-family: 'Nunito';
  src: url('../vendor/nunito.woff2') format('woff2-variations'), url('../vendor/nunito.woff2') format('woff2');
  font-weight: 200 1000; font-style: normal; font-display: swap;
}
:root {
  --surface: rgba(255,255,255,0.93);
  --surface-strong: rgba(255,255,255,0.95);
  --surface-line: rgba(255,255,255,0.55);
  --radius: 18px;
  --shadow-1: 0 1px 2px rgba(6,20,40,0.10), 0 6px 18px -6px rgba(6,20,40,0.28);
  --shadow-2: 0 2px 4px rgba(6,20,40,0.10), 0 16px 34px -10px rgba(6,20,40,0.42);
  --on-scene: #F4F8FC;
  --on-scene-sub: rgba(236,244,252,0.8);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --muted: #8A9AA0;
}
html, body { font-family: 'Nunito', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; }
[hidden] { display: none !important; }
::selection { background: color-mix(in srgb, var(--accent) 30%, transparent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
* { scrollbar-width: thin; scrollbar-color: rgba(120,140,160,0.45) transparent; }
input, textarea, select { caret-color: var(--accent); }
input:focus, textarea:focus, select:focus { outline-color: var(--accent); }
.dash-stat-value, .stat-num, .ml-stat-val, .ac-chip-val, .table td { font-variant-numeric: tabular-nums; }

/* ── Scene host ── */
.ocean-bg, .main.ocean-host { background: #123F63; }
.live-bg { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.ocean-bg > .ocean-scene { position: fixed; inset: 0; }

/* ── Surfaces ── */
.card, .panel, .dash-stat, .dash-lesson-row, .dash-empty, .list-row, .ml-list-card, .ml-tip,
.ac-card, .ac-empty, .table, .settings-list, .app-card, .login-card {
  background: var(--surface);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--surface-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  color: var(--text);
}
.table { border-collapse: separate; border-spacing: 0; overflow: hidden; }
.table th { background: rgba(244,246,247,0.7); }
.modal, .dropdown-filter-panel {
  background: var(--surface-strong);
  -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px);
  border: 1px solid var(--surface-line);
  border-radius: 22px; box-shadow: var(--shadow-2);
}
.modal-overlay { background: rgba(4,14,30,0.5); -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px); }
.login-card { padding: 26px 24px; border-radius: 24px; background: var(--surface-strong); box-shadow: var(--shadow-2); }
.login-logo-circle { box-shadow: var(--shadow-2); }
.login-hint { color: var(--on-scene-sub); }
.field-icon { background: rgba(236,241,244,0.9); }
.field-icon input[type] { border: none; background: transparent; padding: 13px 0; outline: none; }
.login-tagline { display: flex; align-items: center; justify-content: center; gap: 6px; }
#loginTaglineEmoji { display: inline-flex; width: auto; }

/* Interactive surfaces lift; everything presses. */
.dash-stat, .dash-lesson-row, .list-row, .ac-card, .app-card, .ml-row {
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out), background-color .2s ease;
}
.dash-lesson-row:hover, .list-row:hover, .ac-card:hover, .app-card:hover, .dash-stat:hover {
  transform: translateY(-3px); box-shadow: var(--shadow-2);
}
.btn, .btn-pill, .dash-hero-btn, .dash-lesson-btn, .dash-empty-btn, .ac-empty-btn, .ml-fab, .ac-fab, .tab, .nav-item {
  transition: transform .15s var(--ease-out), background-color .2s ease, box-shadow .2s ease, color .2s ease;
}
.btn:active, .btn-pill:active, .dash-hero-btn:active, .dash-lesson-btn:active, .dash-empty-btn:active,
.ac-empty-btn:active, .ml-fab:active, .ac-fab:active, .tab:active { transform: scale(0.96); }
.btn { border-radius: 10px; }
.btn-primary { background: var(--accent); }
.btn-primary:hover { background: var(--accent-dark); }
.ml-fab, .ac-fab { background: var(--accent); box-shadow: var(--shadow-2); }
.ml-fab:hover, .ac-fab:hover { background: var(--accent-dark); transform: translateY(-2px); }

/* ── Topbar + sidebar ── */
.topbar-translucent {
  background: rgba(255,255,255,0.8);
  -webkit-backdrop-filter: blur(18px) saturate(160%); backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid rgba(255,255,255,0.5);
}
.topbar h1 { font-weight: 900; letter-spacing: -0.01em; }
.nav-item { border-radius: 10px; }
.nav-item.active { box-shadow: 0 4px 12px -4px rgba(0,0,0,0.45); }

/* ── Dashboard: hero, stats with icon chips (no strips) ── */
.dash-hero, .ml-statsbar {
  background: rgba(6,18,38,0.42);
  -webkit-backdrop-filter: blur(16px) saturate(140%); backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius); box-shadow: var(--shadow-1);
}
.dash-hero-eyebrow { color: var(--on-scene); font-size: 15px; font-weight: 800; }
.dash-hero-btn { color: var(--accent-dark); }
.dash-stat-strip, .dash-lesson-accent { display: none; }
.dash-stat { text-align: left; padding: 16px; display: grid; grid-template-columns: auto 1fr; column-gap: 14px; align-items: center; }
.dash-stat-icon {
  grid-row: span 3; width: 46px; height: 46px; border-radius: 14px; margin: 0;
  display: grid; place-items: center;
  background: color-mix(in srgb, currentColor 14%, transparent);
}
.dash-stat-label { margin: 0; letter-spacing: 0.05em; }
.dash-stat-value { font-size: 26px; line-height: 1.15; }
.dash-stat-sub { margin: 0; }
@media (max-width: 640px) {
  .dash-stats-row { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .dash-stat { grid-template-columns: 1fr; text-align: center; padding: 12px 6px; justify-items: center; row-gap: 2px; }
  .dash-stat-icon { grid-row: auto; width: 36px; height: 36px; border-radius: 12px; margin-bottom: 4px; }
  .dash-stat-label { font-size: 9.5px; }
  .dash-stat-value { font-size: 22px; }
}
.dash-mini-stats, .mini-stats { gap: 8px; }
.mini-stat {
  color: var(--on-scene-sub); background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.16); border-radius: 999px; padding: 6px 12px;
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.mini-stat b { color: var(--on-scene); }
.card .mini-stat, .modal .mini-stat { color: var(--sub); background: var(--bg); border-color: var(--border); }
.card .mini-stat b, .modal .mini-stat b { color: var(--text); }
.dash-section-hdr, .section-title, .settings-section-label, .section-group-count, .view > .loading { color: var(--on-scene); }
.card .section-title, .modal .section-title, .settings-list .section-title { color: var(--text); }
.dash-section-hdr a { color: var(--on-scene); display: inline-flex; align-items: center; gap: 2px; white-space: nowrap; opacity: .9; }
.dash-section-hdr a:hover { opacity: 1; }
.dash-lesson-row { padding: 12px 14px; }
.dash-lesson-icon { border-radius: 12px; }
.dash-lesson-btn { border-radius: 999px; }
.dash-empty { padding: 36px 20px; }
.dash-empty-btn, .ac-empty-btn { display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; border-radius: 999px; }

.dash-section-hdr span { color: var(--on-scene); }

/* ── Dashboard layout: hero band, stat cards, then panels ──
   Wide screens use the width: a main column of grouped lists beside a
   side column. Below 1024px everything stacks into the phone layout. */
.dash-hero-split { display: grid; gap: 16px; padding: 22px 24px; margin-bottom: 18px; }
.dash-hero-title { margin: 0; color: var(--on-scene); font-size: 26px; font-weight: 900; letter-spacing: -0.01em; line-height: 1.15; }
.dash-hero-sub { margin: 4px 0 0; color: var(--on-scene-sub); font-size: 14px; font-weight: 700; }
.dash-hero-split .stu-continue { margin: 0; }
.dash-hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.dash-hero-btn-ghost { background: rgba(255,255,255,0.14); color: var(--on-scene); border: 1px solid rgba(255,255,255,0.3); }
.dash-hero-btn-ghost:hover { background: rgba(255,255,255,0.24); }
.dash-stats-row { gap: 14px; margin-bottom: 18px; }

.dash-layout { display: grid; gap: 18px; align-items: start; }
.dash-side { display: grid; gap: 18px; }
.panel { overflow: hidden; }
.panel-hdr { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 20px 12px; }
.panel-hdr h2 { margin: 0; font-size: 15px; font-weight: 900; color: var(--text); display: inline-flex; align-items: center; gap: 8px; }
.panel-hdr h2 svg { color: var(--accent); }
.panel-hdr a { color: var(--accent-dark); font-size: 13px; font-weight: 800; text-decoration: none; display: inline-flex; align-items: center; gap: 2px; white-space: nowrap; }
.panel-hdr a:hover { text-decoration: underline; text-underline-offset: 3px; }
.panel-body { padding: 0 20px 20px; }
.panel-big { font-size: 13.5px; font-weight: 700; color: var(--sub); margin-bottom: 12px; }
.panel-big b { display: block; font-size: 32px; font-weight: 900; line-height: 1.1; color: var(--text); font-variant-numeric: tabular-nums; }
.panel-empty { margin: 0; padding: 4px 20px 20px; color: var(--sub); font-size: 13.5px; }
.panel-empty-inline { margin: 0 0 12px; color: var(--sub); font-size: 13.5px; }
/* Rows inside a panel read as one divided list, not separate floating cards. */
.panel .dash-lesson-row, .panel .notif {
  background: transparent; border: 0; border-top: 1px solid var(--border); border-radius: 0;
  box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; margin: 0; padding: 13px 20px;
}
.panel .dash-lesson-row:hover, .panel .notif:hover { transform: none; box-shadow: none; background: color-mix(in srgb, var(--accent) 6%, transparent); }
.glance-row {
  display: flex; align-items: center; gap: 12px; padding: 13px 20px; border-top: 1px solid var(--border);
  color: var(--text); text-decoration: none; transition: background-color .2s ease;
}
.glance-row:hover { background: color-mix(in srgb, var(--accent) 6%, transparent); }
.glance-icon {
  width: 34px; height: 34px; border-radius: 11px; flex-shrink: 0; display: grid; place-items: center;
  background: color-mix(in srgb, currentColor 14%, transparent);
}
.glance-label { flex: 1; font-size: 14px; font-weight: 700; }
.glance-row b { font-size: 18px; font-weight: 900; font-variant-numeric: tabular-nums; }
.glance-row.is-due b { color: #D9472F; }
@media (min-width: 1024px) {
  .dash-hero-split { grid-template-columns: minmax(0, 1fr) auto; align-items: center; padding: 26px 28px; }
  .dash-hero-split:has(.stu-continue) { grid-template-columns: minmax(0, 1fr) minmax(360px, 1.15fr); }
  .dash-hero-title { font-size: 30px; }
  .dash-layout { grid-template-columns: minmax(0, 1.7fr) minmax(300px, 1fr); }
}
.page-tabs { border-bottom-color: rgba(255,255,255,0.18); }
.page-tab { color: var(--on-scene-sub); }
.page-tab.active, .page-tab.push-right { color: var(--on-scene); border-bottom-color: var(--on-scene); }
.section-group-header { color: var(--on-scene-sub); }
.section-group-count { background: rgba(255,255,255,0.16); color: var(--on-scene); }
.search-box { border-radius: 999px; box-shadow: var(--shadow-1); }

/* Tabs / switchers on the scene */
.tab { border-radius: 999px; background: var(--surface); border-color: var(--surface-line); color: var(--sub); }
.tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.toast { border-radius: 14px; box-shadow: var(--shadow-2); }

/* Profile photos fill their round avatar; initials show when there's none. */
.topbar-avatar, .profile-avatar-lg, .post-avatar { overflow: hidden; }
.topbar-avatar img, .profile-avatar-lg img, .post-avatar img { width: 100%; height: 100%; object-fit: cover; display: block; }
.photo-controls { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin: 4px 0 12px; }
.photo-controls .btn { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }

/* Admin console: a teacher's sections */
.section-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.section-chips:empty { display: none; }
.section-chip {
  display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 0 12px;
  border: 1.5px solid var(--border); border-radius: 999px; background: #fff;
  font-size: 13px; font-weight: 700; color: var(--text); cursor: pointer;
}
.section-chip:has(input:checked) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, #fff); }
.section-chip input { margin: 0; accent-color: var(--accent); }
.section-add { display: flex; gap: 8px; }
.section-add input { flex: 1; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}