/* ============================================================
   EduPlatform — clean, professional, gamified UI
   Light theme by default, dark via [data-theme="dark"]
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,500;12..96,700;12..96,800&family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');

:root {
  --bg: #f5f6fb;
  --bg-soft: #eef0f8;
  --surface: #ffffff;
  --surface-2: #fbfbfe;
  --border: #e6e8f1;
  --text: #1c1d2b;
  --text-soft: #5b5d72;
  --muted: #8a8ca3;

  --primary: #ea580c;          /* red-orange */
  --primary-soft: #ffece1;
  --primary-dark: #c2410c;
  --accent: #0d9488;           /* blue-green / teal */
  --accent-soft: #d6f5f0;
  --green: #0d9488;
  --green-soft: #d6f5f0;
  --red: #dc2626;
  --red-soft: #fde7e7;
  --blue: #0d9488;             /* "blue" pills render blue-green */

  --shadow-sm: 0 1px 2px rgba(20,22,50,.05);
  --shadow: 0 4px 18px rgba(28,29,60,.08);
  --shadow-lg: 0 18px 48px rgba(28,29,60,.14);
  --radius: 16px;
  --radius-sm: 10px;
  --font-display: 'Bricolage Grotesque', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;
}

[data-theme="dark"] {
  --bg: #0e0f1a;
  --bg-soft: #15162552;
  --surface: #181a2a;
  --surface-2: #1f2235;
  --border: #2a2d44;
  --text: #ecedf6;
  --text-soft: #a9abc4;
  --muted: #777a96;
  --primary: #fb7a45;
  --primary-soft: #3a1d10;
  --primary-dark: #ea580c;
  --accent: #2dd4bf;
  --accent-soft: #0c2e2a;
  --green-soft: #0c2e2a;
  --red-soft: #3a1414;
  --shadow: 0 4px 22px rgba(0,0,0,.4);
  --shadow-lg: 0 18px 48px rgba(0,0,0,.55);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background .25s, color .25s;
}
h1,h2,h3,h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.15; letter-spacing: -.01em; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: none; }

/* ---------- Layout ---------- */
.app { display: flex; min-height: 100vh; }
.sidebar {
  width: 248px; flex-shrink: 0; background: var(--surface);
  border-right: 1px solid var(--border); padding: 22px 16px;
  display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 10px 22px; }
.brand-logo {
  width: 38px; height: 38px; border-radius: 11px; overflow: hidden;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid; place-items: center; color: #fff; font-family: var(--font-display);
  font-weight: 800; font-size: 20px; box-shadow: var(--shadow); flex-shrink: 0;
}
.brand-logo img { width: 100%; height: 100%; object-fit: cover; }
.brand-name { font-family: var(--font-display); font-weight: 800; font-size: 19px; }
.brand-name small { display: block; font-size: 11px; color: var(--muted); font-weight: 500; font-family: var(--font-body); letter-spacing: .04em; text-transform: uppercase; }

.nav { display: flex; flex-direction: column; gap: 3px; margin-top: 6px; }
.nav a {
  display: flex; align-items: center; gap: 12px; padding: 10px 13px;
  border-radius: var(--radius-sm); color: var(--text-soft); font-weight: 500;
  font-size: 14.5px; transition: all .15s; text-decoration: none;
}
.nav a:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.nav a.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.nav a svg { width: 19px; height: 19px; flex-shrink: 0; }
.nav-label { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); padding: 16px 13px 6px; font-weight: 600; }
.sidebar-footer { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--border); }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  height: 64px; background: var(--surface); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; position: sticky; top: 0; z-index: 20;
}
.topbar h2 { font-size: 18px; }
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.content { padding: 28px; max-width: 1180px; width: 100%; margin: 0 auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px;
  border-radius: var(--radius-sm); border: 1px solid transparent; font-weight: 600;
  font-size: 14px; cursor: pointer; font-family: var(--font-body); transition: all .15s;
  background: var(--primary); color: #fff; text-decoration: none;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text-soft); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg-soft); color: var(--text); }
.btn-accent { background: var(--accent); color: #4a2d00; }
.btn-accent:hover { background: #e08e07; }
.btn-danger { background: var(--red); }
.btn-danger:hover { background: #c01840; }
.btn-success { background: var(--green); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; justify-content: center; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 11px; border: 1px solid var(--border);
  background: var(--surface); display: grid; place-items: center; cursor: pointer;
  color: var(--text-soft); position: relative; transition: all .15s;
}
.icon-btn:hover { background: var(--bg-soft); color: var(--text); }
.icon-btn svg { width: 19px; height: 19px; }
.dot {
  position: absolute; top: 7px; right: 8px; width: 8px; height: 8px;
  background: var(--red); border-radius: 50%; border: 2px solid var(--surface);
}

/* ---------- Cards ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm);
}
.card-hd { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.card-hd h3 { font-size: 16px; }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3,.grid-4 { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 600px) { .grid-2,.grid-3,.grid-4 { grid-template-columns: 1fr; } }

/* ---------- Stat tiles ---------- */
.stat {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column; gap: 4px;
}
.stat .label { font-size: 12.5px; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .05em; }
.stat .value { font-family: var(--font-display); font-size: 30px; font-weight: 800; }
.stat .ic { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; margin-bottom: 6px; }

/* ---------- Forms ---------- */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 6px; color: var(--text-soft); }
input, select, textarea {
  width: 100%; padding: 11px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-family: var(--font-body); font-size: 14.5px; background: var(--surface-2); color: var(--text);
  transition: border .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft);
}
textarea { resize: vertical; min-height: 90px; }
.checks { display: flex; flex-wrap: wrap; gap: 8px; }
.check {
  display: flex; align-items: center; gap: 8px; padding: 8px 14px; border: 1px solid var(--border);
  border-radius: 999px; cursor: pointer; font-size: 14px; background: var(--surface-2);
}
.check input { width: auto; }

/* ---------- Tables ---------- */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; padding: 11px 14px; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); border-bottom: 1px solid var(--border); }
td { padding: 13px 14px; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--bg-soft); }

/* ---------- Badges / pills ---------- */
.pill { display: inline-flex; align-items: center; gap: 5px; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.pill-green { background: var(--green-soft); color: var(--green); }
.pill-amber { background: var(--accent-soft); color: #b45309; }
.pill-red { background: var(--red-soft); color: var(--red); }
.pill-blue { background: var(--primary-soft); color: var(--primary); }
.pill-gray { background: var(--bg-soft); color: var(--text-soft); }

/* ---------- XP / Level ---------- */
.xp-card {
  background: linear-gradient(135deg, var(--primary), #6d5ef0 60%, #8b6cf0);
  color: #fff; border-radius: var(--radius); padding: 24px; position: relative; overflow: hidden;
  box-shadow: var(--shadow);
}
.xp-card::after {
  content: ""; position: absolute; right: -40px; top: -40px; width: 180px; height: 180px;
  background: radial-gradient(circle, rgba(255,255,255,.18), transparent 70%); border-radius: 50%;
}
.xp-card h2 { color: #fff; font-size: 22px; }
.xp-card .lvl-title { opacity: .85; font-size: 14px; }
.xp-bar { height: 12px; background: rgba(255,255,255,.25); border-radius: 999px; overflow: hidden; margin: 14px 0 6px; }
.xp-bar span { display: block; height: 100%; background: var(--accent); border-radius: 999px; transition: width .8s ease; }
.xp-meta { display: flex; justify-content: space-between; font-size: 13px; opacity: .9; }

.streak-chip { display: inline-flex; align-items: center; gap: 6px; background: var(--accent-soft); color: #b45309; padding: 6px 12px; border-radius: 999px; font-weight: 700; font-size: 14px; }

/* ---------- Progress bar ---------- */
.progress { height: 8px; background: var(--bg-soft); border-radius: 999px; overflow: hidden; }
.progress span { display: block; height: 100%; background: var(--primary); border-radius: 999px; transition: width .6s; }

/* ---------- Badge grid ---------- */
.badge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px,1fr)); gap: 14px; }
.badge-item { text-align: center; padding: 18px 10px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface-2); }
.badge-item.locked { opacity: .45; filter: grayscale(1); }
.badge-ic { width: 52px; height: 52px; margin: 0 auto 10px; border-radius: 14px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); }
.badge-ic svg { width: 26px; height: 26px; }
.badge-item.locked .badge-ic { background: var(--bg-soft); color: var(--muted); }
.badge-name { font-weight: 700; font-size: 14px; }
.badge-desc { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ---------- Leaderboard ---------- */
.lb-row { display: flex; align-items: center; gap: 14px; padding: 12px 14px; border-radius: var(--radius-sm); }
.lb-row + .lb-row { margin-top: 2px; }
.lb-row.me { background: var(--primary-soft); }
.lb-rank { width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center; font-weight: 800; font-family: var(--font-display); background: var(--bg-soft); color: var(--text-soft); }
.lb-rank.r1 { background: linear-gradient(135deg,#ffd86b,#f59e0b); color: #5a3c00; }
.lb-rank.r2 { background: linear-gradient(135deg,#e3e7ef,#b6bccb); color: #3a3f4d; }
.lb-rank.r3 { background: linear-gradient(135deg,#f0c08a,#cd7f32); color: #4a2a00; }
.lb-avatar { width: 38px; height: 38px; border-radius: 50%; background: var(--primary-soft); color: var(--primary); display: grid; place-items: center; font-weight: 700; }
.lb-name { font-weight: 600; flex: 1; }
.lb-xp { font-weight: 800; font-family: var(--font-display); color: var(--accent); }

/* ---------- Flash ---------- */
.flashes { position: fixed; top: 18px; right: 18px; z-index: 1000; display: flex; flex-direction: column; gap: 10px; max-width: 360px; }
.flash {
  padding: 13px 18px; border-radius: var(--radius-sm); box-shadow: var(--shadow-lg);
  font-size: 14px; font-weight: 500; background: var(--surface); border-left: 4px solid var(--primary);
  animation: slideIn .3s ease;
}
.flash.success { border-color: var(--green); }
.flash.error { border-color: var(--red); }
.flash.warning { border-color: var(--accent); }
@keyframes slideIn { from { transform: translateX(40px); opacity: 0; } to { transform: none; opacity: 1; } }

/* ---------- Auth pages ---------- */
.auth-wrap { min-height: 100vh; display: grid; grid-template-columns: 1fr 1fr; }
@media (max-width: 880px) { .auth-wrap { grid-template-columns: 1fr; } .auth-side { display: none; } }
.auth-side {
  background: linear-gradient(150deg, var(--primary) 0%, #5b4fe0 45%, #7c5cf0 100%);
  color: #fff; padding: 56px; display: flex; flex-direction: column; justify-content: center; position: relative; overflow: hidden;
}
.auth-side::before { content:""; position:absolute; inset:0; background: radial-gradient(circle at 80% 20%, rgba(255,255,255,.15), transparent 50%); }
.auth-side h1 { color: #fff; font-size: 40px; position: relative; }
.auth-side p { opacity: .9; margin-top: 14px; font-size: 16px; max-width: 420px; position: relative; }
.auth-feats { margin-top: 34px; display: flex; flex-direction: column; gap: 14px; position: relative; }
.auth-feat { display: flex; align-items: center; gap: 12px; font-size: 15px; }
.auth-feat .fic { width: 36px; height: 36px; border-radius: 10px; background: rgba(255,255,255,.16); display: grid; place-items: center; }
.auth-form { display: flex; align-items: center; justify-content: center; padding: 40px; }
.auth-box { width: 100%; max-width: 400px; }
.auth-box h2 { font-size: 28px; margin-bottom: 6px; }
.auth-sub { color: var(--muted); margin-bottom: 26px; }
.tabs { display: flex; gap: 4px; background: var(--bg-soft); padding: 4px; border-radius: var(--radius-sm); margin-bottom: 22px; }
.tabs button { flex: 1; padding: 9px; border: none; background: transparent; border-radius: 8px; font-weight: 600; font-size: 13.5px; cursor: pointer; color: var(--text-soft); font-family: var(--font-body); }
.tabs button.active { background: var(--surface); color: var(--primary); box-shadow: var(--shadow-sm); }

/* ---------- Video player ---------- */
.player-layout { display: grid; grid-template-columns: 1fr 340px; gap: 20px; }
@media (max-width: 1000px) { .player-layout { grid-template-columns: 1fr; } }
.player-shell { background: #000; border-radius: var(--radius); overflow: hidden; position: relative; aspect-ratio: 16/9; }
.player-shell iframe { width: 100%; height: 100%; border: 0; pointer-events: none; }
.player-overlay { position: absolute; inset: 0; cursor: pointer; }
.player-controls {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 14px 16px 12px;
  background: linear-gradient(transparent, rgba(0,0,0,.78)); display: flex; flex-direction: column; gap: 8px;
  opacity: 0; transition: opacity .2s;
}
.player-shell:hover .player-controls { opacity: 1; }
.seek { width: 100%; height: 6px; background: rgba(255,255,255,.3); border-radius: 999px; cursor: pointer; position: relative; }
.seek-fill { height: 100%; background: var(--accent); border-radius: 999px; width: 0; }
.ctrl-row { display: flex; align-items: center; gap: 14px; color: #fff; }
.ctrl-row button { background: none; border: none; color: #fff; cursor: pointer; display: grid; place-items: center; }
.ctrl-row svg { width: 20px; height: 20px; }
.ctrl-time { font-size: 13px; font-variant-numeric: tabular-nums; }
.ctrl-spacer { flex: 1; }

.notes-panel { display: flex; flex-direction: column; height: 100%; }
.note-input { display: flex; gap: 8px; margin-bottom: 12px; }
.note-list { display: flex; flex-direction: column; gap: 8px; max-height: 460px; overflow-y: auto; }
.note {
  border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 12px;
  background: var(--surface-2); cursor: pointer; transition: border .15s;
}
.note:hover { border-color: var(--primary); }
.note-time { font-size: 12px; font-weight: 700; color: var(--primary); font-variant-numeric: tabular-nums; }
.note-text { font-size: 13.5px; margin-top: 3px; }

/* ---------- Monitor / live ---------- */
.monitor-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px,1fr)); gap: 12px; }
.mon-card { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 14px; background: var(--surface); display: flex; align-items: center; gap: 10px; }
.mon-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--green); }
.mon-dot.away { background: var(--red); }
.feed { display: flex; flex-direction: column; gap: 6px; max-height: 420px; overflow-y: auto; }
.feed-item { font-size: 13px; padding: 8px 12px; border-radius: 8px; background: var(--bg-soft); }

/* ---------- Misc ---------- */
.empty { text-align: center; padding: 48px 20px; color: var(--muted); }
.empty svg { width: 46px; height: 46px; margin-bottom: 10px; opacity: .5; }
.page-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 22px; flex-wrap: wrap; gap: 12px; }
.page-head h1 { font-size: 26px; }
.page-head p { color: var(--muted); font-size: 14px; }
.row { display: flex; gap: 12px; align-items: center; }
.muted { color: var(--muted); }
.mt { margin-top: 18px; } .mb { margin-bottom: 18px; }
.tag-live { display:inline-flex; align-items:center; gap:6px; color: var(--red); font-weight:700; font-size:12px; }
.tag-live::before { content:""; width:8px; height:8px; border-radius:50%; background: var(--red); animation: pulse 1.2s infinite; }
@keyframes pulse { 0%,100%{opacity:1;} 50%{opacity:.3;} }

.toast-pop {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--bg); padding: 14px 24px; border-radius: 999px;
  font-weight: 700; box-shadow: var(--shadow-lg); opacity: 0; transition: all .3s; z-index: 2000;
  display: flex; align-items: center; gap: 10px;
}
.toast-pop.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============================================================
   Additional components (dashboard, player extras, exams, etc.)
   ============================================================ */

/* Notification bell dot */
.notif-dot {
  position: absolute; top: -4px; right: -4px; min-width: 17px; height: 17px;
  padding: 0 4px; border-radius: 999px; background: var(--red); color: #fff;
  font-size: 11px; font-weight: 700; display: grid; place-items: center; line-height: 1;
}

/* Quick-access tiles */
.quick {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 20px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface-2); color: var(--text); font-weight: 600; font-size: 14px;
  transition: transform .15s, border-color .15s, box-shadow .15s;
}
.quick:hover { transform: translateY(-3px); border-color: var(--primary); box-shadow: var(--shadow-sm); }
.quick-ic { font-size: 26px; }

/* Mission rows */
.mission { padding: 12px 0; border-bottom: 1px solid var(--border); }
.mission:last-child { border-bottom: 0; }

/* Choose-course screen */
.choose-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: var(--bg); }
.choose-box { width: 100%; max-width: 640px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 34px; box-shadow: var(--shadow); }
.choose-card { display: flex; align-items: center; gap: 14px; padding: 16px; border: 1px solid var(--border);
  border-radius: var(--radius-sm); background: var(--surface-2); transition: border-color .15s, transform .15s; }
.choose-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.choose-ic { width: 46px; height: 46px; border-radius: 12px; background: var(--primary); color: #fff;
  display: grid; place-items: center; font-weight: 800; font-size: 20px; flex-shrink: 0; }

/* Class / demo cards with thumbnails */
.class-card { padding: 0; overflow: hidden; transition: transform .15s, box-shadow .15s; }
.class-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.class-thumb { position: relative; aspect-ratio: 16/9; background: #000; overflow: hidden; }
.class-thumb img { width: 100%; height: 100%; object-fit: cover; }
.thumb-fallback { width: 100%; height: 100%; display: grid; place-items: center; font-size: 34px; background: var(--surface-2); }
.play-badge { position: absolute; inset: 0; margin: auto; width: 52px; height: 52px; border-radius: 50%;
  background: rgba(0,0,0,.55); color: #fff; display: grid; place-items: center; font-size: 20px; }

/* Note delete button */
.note-del { background: none; border: 0; color: var(--muted); font-size: 18px; line-height: 1;
  cursor: pointer; padding: 0 2px; }
.note-del:hover { color: var(--red); }

/* MCQ option */
.opt { display: flex; align-items: center; gap: 10px; padding: 11px 14px; border: 1px solid var(--border);
  border-radius: var(--radius-sm); cursor: pointer; transition: border-color .15s, background .15s; }
.opt:hover { border-color: var(--primary); }
.opt input { accent-color: var(--primary); }

/* Exam banner / anti-cheat */
.exam-banner { display: flex; justify-content: space-between; align-items: center; gap: 12px;
  background: var(--accent-soft); border: 1px solid var(--accent); color: var(--text);
  padding: 12px 16px; border-radius: var(--radius-sm); margin-bottom: 18px; font-weight: 600; font-size: 14px; }
.exam-banner.alarm { background: var(--red-soft); border-color: var(--red); }

/* Image previews / chips */
.img-preview { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.img-preview img { width: 110px; height: 110px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); }
.img-chip { display: inline-block; padding: 3px 8px; margin: 2px; border-radius: 6px;
  background: var(--primary-soft); color: var(--primary); font-size: 12px; font-weight: 600; }

/* Result hero */
.result-hero { display: flex; align-items: center; gap: 22px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-sm); }
.result-score { font-size: 52px; font-weight: 800; color: var(--primary); font-family: var(--font-display); line-height: 1; }
.result-score small { font-size: 22px; color: var(--muted); }

/* Demo iframe */
.demo-frame { width: 100%; height: 72vh; border: 0; background: #fff; }

/* Self-study */
.study-card { background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.study-timer { font-family: var(--font-display); font-size: 52px; font-weight: 800;
  font-variant-numeric: tabular-nums; margin: 6px 0; }
.study-state { font-size: 14px; opacity: .9; }
.study-card .btn { background: rgba(255,255,255,.16); color: #fff; border: 0; }

/* Profile avatar */
.profile-avatar { width: 64px; height: 64px; border-radius: 18px; background: rgba(255,255,255,.18);
  color: #fff; display: grid; place-items: center; font-size: 28px; font-weight: 800; font-family: var(--font-display); }

/* Badge lock overlay */
.badge-item { position: relative; }
.badge-lock { position: absolute; top: 8px; right: 10px; font-size: 14px; }

/* Notification rows */
.notif-row { display: flex; align-items: flex-start; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.notif-row:last-child { border-bottom: 0; }
.notif-ic { width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center;
  font-size: 18px; background: var(--primary-soft); flex-shrink: 0; }
.notif-badge { background: var(--accent-soft); }
.notif-level { background: var(--primary-soft); }
.notif-mission { background: var(--green-soft); }

/* Exam question builder block */
.qblock { padding: 14px; border: 1px dashed var(--border); border-radius: var(--radius-sm); margin-bottom: 12px; }
.qblock input, .qblock select, .qblock textarea { margin-bottom: 8px; }

/* global: kill underlines everywhere */
a, a:hover, a:focus { text-decoration: none !important; }

/* hamburger / mobile menu button (hidden on desktop) */
.menu-btn { display: none; background: none; border: 0; color: var(--text); cursor: pointer; padding: 6px; }
.menu-btn svg { width: 24px; height: 24px; }
.sidebar-backdrop { display: none; }

/* dashboard study widget */
.study-widget { display: flex; align-items: center; gap: 16px; background: linear-gradient(135deg, var(--accent), #0b7d73);
  color: #fff; border-radius: var(--radius); padding: 18px 22px; box-shadow: var(--shadow); }
.study-widget .sw-timer { font-family: var(--font-display); font-size: 30px; font-weight: 800; font-variant-numeric: tabular-nums; line-height: 1; }
.study-widget .sw-dot { width: 10px; height: 10px; border-radius: 50%; background: #fff; display: inline-block; margin-right: 6px; }
.study-widget.paused .sw-dot { background: #ffd9c2; }

/* ---------- Mobile responsive ---------- */
@media (max-width: 860px) {
  .menu-btn { display: inline-grid; place-items: center; }
  .sidebar {
    position: fixed; top: 0; left: 0; z-index: 60; height: 100vh; width: 250px;
    transform: translateX(-100%); transition: transform .25s ease; box-shadow: var(--shadow-lg);
  }
  .app.nav-open .sidebar { transform: translateX(0); }
  .app.nav-open .sidebar-backdrop {
    display: block; position: fixed; inset: 0; z-index: 55; background: rgba(0,0,0,.45);
  }
  .content { padding: 16px; }
  .topbar { padding: 0 14px; }
  .topbar h2 { font-size: 16px; }
  .page-head { flex-direction: column; align-items: flex-start; gap: 10px; }
  .player-layout { grid-template-columns: 1fr; }
  .study-widget { flex-direction: column; align-items: flex-start; }
  table { font-size: 13px; }
  .auth-wrap { grid-template-columns: 1fr; }
  .auth-side { display: none; }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .result-hero { flex-direction: column; text-align: center; }
  .study-timer { font-size: 40px; }
}

/* error page */
.err-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: var(--bg); }
.err-box { text-align: center; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 48px 40px; box-shadow: var(--shadow); max-width: 460px; }
.err-code { font-family: var(--font-display); font-size: 72px; font-weight: 800; color: var(--primary); line-height: 1; }

/* sidebar logout fix */
.logout-link { display: flex; align-items: center; gap: 12px; padding: 10px 13px; border-radius: var(--radius-sm);
  color: var(--red); font-weight: 600; font-size: 14.5px; background: var(--red-soft); }
.logout-link svg { width: 19px; height: 19px; flex-shrink: 0; }
.logout-link:hover { background: var(--red); color: #fff; }

/* ============ Design polish (eyebrow labels + gamified) ============ */
.eyebrow { display: inline-block; font-size: 11px; font-weight: 800; letter-spacing: .14em;
  text-transform: uppercase; color: var(--primary); margin-bottom: 6px; }
.page-head h1 { font-family: var(--font-display); font-size: 30px; font-weight: 800; line-height: 1.1; letter-spacing: -.01em; }
.page-head p { color: var(--muted); font-size: 14px; margin-top: 4px; max-width: 60ch; }

/* gamified stat tiles: accent top edge + lift */
.stat { position: relative; overflow: hidden; transition: transform .15s, box-shadow .15s; }
.stat::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent)); opacity: .9; }
.stat:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.stat .value { background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

/* cards a touch softer + cleaner */
.card { border-radius: var(--radius); }
.card-hd h3 { font-family: var(--font-display); font-weight: 800; }

/* quick-access tiles: gamified gradient hover */
.quick:hover .quick-ic { transform: scale(1.12); }
.quick-ic { transition: transform .15s; }

/* section card headers as eyebrow style on dashboards */
.card-hd { align-items: baseline; }

/* nicer live tag */
.tag-live { display: inline-flex; align-items: center; gap: 6px; background: var(--red-soft);
  color: var(--red); font-weight: 800; font-size: 12px; padding: 5px 11px; border-radius: 999px;
  text-transform: uppercase; letter-spacing: .06em; }
.tag-live::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--red);
  animation: livepulse 1.2s infinite; }
@keyframes livepulse { 0%,100% { opacity: 1; } 50% { opacity: .3; } }

/* demonstration fullscreen mode */
.demo-shell { display: flex; flex-direction: column; }
.demo-bar { display: none; align-items: center; justify-content: space-between;
  padding: 8px 14px; background: var(--surface-2); border-bottom: 1px solid var(--border); }
.demo-shell.is-fullscreen { background: var(--bg); border-radius: 0; }
.demo-shell.is-fullscreen .demo-bar { display: flex; }
.demo-shell.is-fullscreen .demo-frame { height: calc(100vh - 42px); }
.demo-shell:fullscreen { width: 100vw; height: 100vh; }

/* ===================================================================
   জ্ঞানজয় — Redesign layer (professional, bold, icon-based)
   =================================================================== */

/* Inline SVG icons inherit text size */
.ic { width: 1em; height: 1em; vertical-align: -0.14em; display: inline-block; flex-shrink: 0; }

/* Premium tokens */
:root{
  --radius: 18px; --radius-sm: 12px;
  --shadow-sm: 0 1px 2px rgba(20,22,50,.06);
  --shadow: 0 6px 24px rgba(28,29,60,.07);
  --shadow-lg: 0 24px 60px rgba(28,29,60,.16);
}
[data-theme="dark"]{ --shadow: 0 6px 26px rgba(0,0,0,.45); }

/* Typography — bolder, tighter (kuet-style) */
h1,h2,h3,h4{ font-weight: 800; letter-spacing: -.02em; }
.eyebrow{ font-size: 11px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; color: var(--primary); display:inline-block; margin-bottom: 8px; }
.page-head h1{ font-size: 32px; line-height: 1.05; }
.page-head p{ color: var(--muted); font-size: 14.5px; margin-top: 6px; max-width: 62ch; }

/* Brand logo — image-friendly, contained */
.brand-logo{ background: #fff; border: 1px solid var(--border); padding: 4px; }
[data-theme="dark"] .brand-logo{ background: #fff; }
.brand-logo img{ width: 100%; height: 100%; object-fit: contain; }

/* Sidebar nav — accent bar on active */
.nav a{ position: relative; border-radius: 12px; padding: 11px 14px; font-weight: 600; }
.nav a.active{ background: linear-gradient(90deg, var(--primary-soft), transparent); color: var(--primary); }
.nav a.active::before{ content:""; position:absolute; left:0; top:8px; bottom:8px; width:3px; border-radius:3px; background: var(--primary); }
.nav a .ic, .nav a svg{ width: 19px; height: 19px; }
.nav-label{ font-size:10.5px; letter-spacing:.14em; text-transform:uppercase; color:var(--muted); font-weight:800; padding:14px 14px 6px; }

/* Buttons & pills — inline-flex so icons align */
.btn{ display:inline-flex; align-items:center; gap:7px; font-weight:700; border-radius: 12px; }
.btn .ic{ width:1.05em; height:1.05em; }
.pill{ display:inline-flex; align-items:center; gap:5px; font-weight:700; }
.pill .ic{ width:13px; height:13px; }

/* Cards — cleaner, more air */
.card{ border-radius: var(--radius); padding: 22px; }
.card-hd h3{ font-size: 16px; letter-spacing: -.01em; }

/* Stat tiles — gamified */
.stat{ padding: 20px; border-radius: var(--radius); }
.stat .value{ font-size: 32px; }

/* Quick-access tiles */
.quick{ border-radius: var(--radius); padding: 22px 14px; gap: 10px; }
.quick-ic{ width:44px; height:44px; border-radius:14px; display:grid; place-items:center;
  background: linear-gradient(135deg, var(--primary-soft), var(--accent-soft)); color: var(--primary); font-size: 22px; }
.quick-ic .ic{ width:22px; height:22px; }

/* XP / hero card */
.xp-card{ border-radius: 22px; padding: 26px; }
.streak-chip{ display:inline-flex; align-items:center; gap:6px; }
.streak-chip .ic{ width:15px; height:15px; }

/* Badges */
.badge-ic{ width:46px; height:46px; display:grid; place-items:center; font-size:24px; color: var(--primary); }
.badge-ic .ic{ width:26px; height:26px; }
.badge-item.locked .badge-ic{ color: var(--muted); opacity:.5; }
.badge-lock .ic{ width:14px; height:14px; }

/* Notifications */
.notif-ic{ font-size:18px; }
.notif-ic .ic{ width:19px; height:19px; }

/* Class / demo thumb icons */
.play-badge .ic{ width:20px; height:20px; }
.thumb-fallback{ color: var(--muted); }
.thumb-fallback .ic{ width:34px; height:34px; }

/* Auth feature icons */
.fic{ display:grid; place-items:center; }
.fic .ic{ width:20px; height:20px; }

/* Leaderboard medal icon */
.lb-rank .ic{ width:20px; height:20px; }

/* ============ Professional monitoring ============ */
.monitor-layout{ display:grid; grid-template-columns: 1.1fr .9fr; gap: 18px; align-items:start; }
.roster{ display:grid; grid-template-columns: repeat(auto-fill, minmax(190px,1fr)); gap: 12px; }
.roster-item{ display:flex; align-items:center; gap:12px; padding:13px; border:1px solid var(--border);
  border-radius:14px; background: var(--surface-2); }
.roster-item .ava{ width:38px; height:38px; border-radius:11px; display:grid; place-items:center;
  background: var(--primary-soft); color: var(--primary); flex-shrink:0; }
.roster-item .ava svg{ width:20px; height:20px; }
.ri-main{ min-width:0; }
.ri-main strong{ display:block; font-size:14px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.ri-flag{ margin-left:auto; color: var(--amber, #d97706); }
.ri-flag svg{ width:18px; height:18px; }
.status-chip{ display:inline-flex; align-items:center; gap:5px; font-size:12px; font-weight:700; margin-top:3px; }
.status-chip .sd{ width:8px; height:8px; border-radius:50%; }
.st-ok{ color: var(--green); } .st-ok .sd{ background: var(--green); box-shadow:0 0 0 3px var(--green-soft); }
.st-away{ color: var(--red); } .st-away .sd{ background: var(--red); box-shadow:0 0 0 3px var(--red-soft); animation: livepulse 1.1s infinite; }

.pro-feed{ max-height: 460px; overflow:auto; }
.fe{ display:flex; align-items:center; gap:11px; padding:11px 4px; border-bottom:1px solid var(--border); }
.fe:last-child{ border-bottom:0; }
.fe-ic{ width:30px; height:30px; border-radius:9px; display:grid; place-items:center; flex-shrink:0; background: var(--bg-soft); color: var(--text-soft); }
.fe-ic svg{ width:16px; height:16px; }
.fe.alert .fe-ic{ background: var(--red-soft); color: var(--red); }
.fe.enter .fe-ic{ background: var(--green-soft); color: var(--green); }
.fe.exit .fe-ic{ background: var(--bg-soft); color: var(--muted); }
.fe.shield .fe-ic{ background: var(--accent-soft); color: var(--accent); }
.fe-tx{ font-size:13.5px; flex:1; min-width:0; }
.fe-t{ font-size:11.5px; color: var(--muted); white-space:nowrap; }

@media (max-width: 860px){ .monitor-layout{ grid-template-columns: 1fr; } }