:root {
  --bg: #f4f5fb;
  --surface: #ffffff;
  --surface-2: #f7f8fc;
  --border: #e4e6f0;
  --text: #1c1f33;
  --muted: #6b7090;
  --primary: #5b5bf7;
  --primary-2: #8b5cf6;
  --primary-soft: #ececff;
  --success: #16a34a;
  --success-soft: #e3f7ea;
  --danger: #dc2626;
  --danger-soft: #fdeaea;
  --warn: #d97706;
  --warn-soft: #fff4e0;
  --shadow: 0 1px 2px rgba(20,22,50,.04), 0 8px 24px rgba(20,22,50,.06);
  --radius: 16px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1020; --surface: #181a2e; --surface-2: #1f2238; --border: #2c2f4a;
    --text: #eceefe; --muted: #9a9ec0; --primary: #7c7cff; --primary-2: #a78bfa; --primary-soft: #26285a;
    --success: #34d399; --success-soft: #133a2c; --danger: #f87171; --danger-soft: #3d1a1f;
    --warn: #fbbf24; --warn-soft: #3a2d10;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.5; min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
button { font: inherit; }
[hidden] { display: none !important; }
.container { max-width: 920px; margin: 0 auto; padding: 24px 16px 64px; }
h1, h2, h3 { margin: 0 0 8px; line-height: 1.2; }
h1 { font-size: 28px; font-weight: 800; letter-spacing: -.02em; }
h2 { font-size: 20px; font-weight: 700; }
h3 { font-size: 16px; font-weight: 600; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.stack > * + * { margin-top: 16px; }

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 16px;
  padding: 12px 20px; background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: blur(12px); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; cursor: pointer; }
.logo {
  width: 32px; height: 32px; border-radius: 10px; display: grid; place-items: center; color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-2)); font-weight: 800;
}
.nav { display: flex; gap: 4px; flex: 1; }
.nav-btn { background: none; border: 0; color: var(--muted); padding: 8px 12px; border-radius: 10px; cursor: pointer; font-weight: 600; }
.nav-btn:hover { background: var(--surface-2); color: var(--text); }
.nav-btn.active { background: var(--primary-soft); color: var(--primary); }
.user { display: flex; align-items: center; gap: 10px; }
.avatar {
  width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; font-size: 13px;
  font-weight: 700; color: var(--primary); background: var(--primary-soft);
}
@media (max-width: 600px) { .user-name, #brandTitle { display: none; } .topbar { padding: 10px 12px; gap: 8px; } .nav-btn { padding: 8px 10px; } }

/* Cards */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.card.pad-sm { padding: 16px; }
.hero {
  position: relative; overflow: hidden; color: #fff; border: 0;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
}
.hero::after {
  content: ''; position: absolute; right: -60px; top: -60px; width: 220px; height: 220px; border-radius: 50%;
  background: rgba(255,255,255,.12);
}
.hero .muted { color: rgba(255,255,255,.8); }
.hero h1 { font-size: 32px; }
.hero .btn.primary { background: #fff; color: var(--primary); }
.hero .btn.primary:hover { background: #f0f0ff; }
.eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; opacity: .85; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid transparent;
  padding: 11px 18px; border-radius: 12px; font-weight: 600; cursor: pointer; transition: .15s ease;
  background: var(--surface-2); color: var(--text); border-color: var(--border);
}
.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn.primary { background: var(--primary); color: #fff; border-color: transparent; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; border-color: var(--border); }
.btn.danger { background: var(--danger-soft); color: var(--danger); border-color: transparent; }
.btn.sm { padding: 6px 12px; font-size: 13px; border-radius: 10px; }
.btn.block { width: 100%; }
.link { background: none; border: 0; color: var(--primary); cursor: pointer; padding: 0; font-weight: 600; }

/* Badges */
.badge { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge.active { background: var(--success-soft); color: var(--success); }
.badge.ended { background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); }
.badge.upcoming { background: var(--warn-soft); color: var(--warn); }
.badge.done { background: var(--primary-soft); color: var(--primary); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }

/* Forms */
.field { display: block; margin-bottom: 14px; }
.field > span { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--muted); }
input, textarea, select {
  width: 100%; padding: 11px 14px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text); font: inherit; outline: none; transition: .15s;
}
input:focus, textarea:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); }
textarea { resize: vertical; min-height: 60px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 600px) { .grid-2 { grid-template-columns: 1fr; } }

/* Login */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px 16px; }
.auth { width: 100%; max-width: 400px; }
.auth .logo { width: 52px; height: 52px; font-size: 24px; border-radius: 16px; margin: 0 auto 16px; }
.auth h1 { text-align: center; }
.auth .sub { text-align: center; margin-bottom: 24px; }
.tabs { display: flex; background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 4px; margin-bottom: 20px; }
.tab { flex: 1; border: 0; background: none; padding: 8px; border-radius: 9px; cursor: pointer; font-weight: 600; color: var(--muted); }
.tab.active { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }

/* Quiz list */
.quiz-list { display: grid; gap: 12px; }
.quiz-item { display: flex; align-items: center; flex-wrap: wrap; gap: 10px 16px; cursor: pointer; transition: .15s; }
.quiz-item:hover { border-color: var(--primary); transform: translateY(-1px); }
.quiz-icon {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; flex-shrink: 0;
  background: var(--primary-soft); color: var(--primary); font-weight: 800;
}
.quiz-item .info { flex: 1 1 180px; min-width: 0; }
.quiz-item .info h3 { margin: 0; overflow-wrap: anywhere; }
.quiz-item .actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
@media (max-width: 600px) { .quiz-item .actions { width: 100%; padding-left: 60px; } .h1-hero, .hero h1 { font-size: 26px; } .card { padding: 18px; } .q-text { font-size: 19px; } }

.countdown { display: flex; gap: 10px; margin: 18px 0; }
.cd-box { background: rgba(255,255,255,.16); border-radius: 12px; padding: 8px 12px; min-width: 62px; text-align: center; }
.cd-box b { display: block; font-size: 22px; font-weight: 800; }
.cd-box small { font-size: 11px; opacity: .85; text-transform: uppercase; letter-spacing: .06em; }

/* Quiz taking */
.progress { height: 8px; background: var(--surface-2); border-radius: 999px; overflow: hidden; border: 1px solid var(--border); }
.progress > div { height: 100%; background: linear-gradient(90deg, var(--primary), var(--primary-2)); transition: width .3s ease; }
.q-text { font-size: 22px; font-weight: 700; margin: 8px 0 20px; letter-spacing: -.01em; }
.options { display: grid; gap: 10px; }
.option {
  display: flex; align-items: center; gap: 14px; text-align: left; width: 100%; padding: 14px 16px;
  border-radius: 14px; border: 2px solid var(--border); background: var(--surface); color: var(--text);
  cursor: pointer; transition: .15s; font-weight: 500;
}
.option:hover { border-color: var(--primary); background: var(--primary-soft); }
.option.selected { border-color: var(--primary); background: var(--primary-soft); }
.option .letter {
  width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center; flex-shrink: 0;
  background: var(--surface-2); border: 1px solid var(--border); font-weight: 700; font-size: 14px;
}
.option.selected .letter { background: var(--primary); color: #fff; border-color: var(--primary); }
.q-dots { display: flex; gap: 6px; flex-wrap: wrap; }
.q-dot {
  width: 30px; height: 30px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface);
  font-size: 12px; font-weight: 700; cursor: pointer; color: var(--muted);
}
.q-dot.answered { background: var(--primary-soft); color: var(--primary); border-color: transparent; }
.q-dot.current { outline: 2px solid var(--primary); outline-offset: 1px; }

/* Results */
.score-ring { width: 96px; height: 96px; flex-shrink: 0; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.stat { background: var(--surface-2); border: 1px solid var(--border); border-radius: 14px; padding: 14px 16px; }
.stat b { display: block; font-size: 24px; font-weight: 800; }
.result-q h3 { font-size: 17px; margin-bottom: 14px; }
.bar-row { position: relative; border-radius: 12px; border: 1px solid var(--border); overflow: hidden; margin-bottom: 8px; background: var(--surface); }
.bar-fill { position: absolute; inset: 0 auto 0 0; background: var(--primary-soft); transition: width .6s ease; }
.bar-row.correct { border-color: var(--success); }
.bar-row.correct .bar-fill { background: var(--success-soft); }
.bar-row.wrong-mine { border-color: var(--danger); }
.bar-row.wrong-mine .bar-fill { background: var(--danger-soft); }
.bar-content { position: relative; display: flex; align-items: center; gap: 10px; padding: 11px 14px; }
.bar-content .txt { flex: 1; font-weight: 500; }
.bar-content .pct { font-weight: 800; font-variant-numeric: tabular-nums; }
.bar-content .cnt { font-size: 12px; color: var(--muted); min-width: 48px; text-align: right; }
.tag { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; }
.tag.ok { background: var(--success); color: #fff; }
.tag.me { background: var(--primary); color: #fff; }
.tag.bad { background: var(--danger); color: #fff; }

/* Table */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 14px; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { background: var(--surface-2); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); position: sticky; top: 0; }
tr:last-child td { border-bottom: 0; }
td.ans-ok { color: var(--success); font-weight: 700; }
td.ans-bad { color: var(--danger); font-weight: 600; }
.rank { width: 26px; height: 26px; border-radius: 50%; display: inline-grid; place-items: center; font-size: 12px; font-weight: 800; background: var(--surface-2); }
.rank.r1 { background: #fde68a; color: #92400e; }
.rank.r2 { background: #e5e7eb; color: #374151; }
.rank.r3 { background: #fed7aa; color: #9a3412; }

/* Admin editor */
.q-edit { border: 1px solid var(--border); border-radius: 14px; padding: 16px; background: var(--surface-2); }
.opt-edit { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.opt-edit input[type=radio] { width: 20px; height: 20px; accent-color: var(--success); flex-shrink: 0; }
.opt-edit input[type=text] { background: var(--surface); }
.icon-btn { border: 0; background: none; color: var(--muted); cursor: pointer; font-size: 18px; padding: 4px 8px; border-radius: 8px; }
.icon-btn:hover { background: var(--danger-soft); color: var(--danger); }

.empty { text-align: center; padding: 48px 24px; }
.empty .big { font-size: 44px; margin-bottom: 8px; }

/* Loader & toast */
.loader { position: fixed; inset: 0; background: rgba(15,16,32,.25); display: grid; place-items: center; z-index: 50; backdrop-filter: blur(2px); }
.spinner { width: 44px; height: 44px; border-radius: 50%; border: 4px solid var(--primary-soft); border-top-color: var(--primary); animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 60; max-width: calc(100% - 32px);
  background: var(--text); color: var(--bg); padding: 12px 18px; border-radius: 12px; font-weight: 600; box-shadow: var(--shadow);
  animation: pop .2s ease;
}
.toast.error { background: var(--danger); color: #fff; }
.toast.success { background: var(--success); color: #fff; }
@keyframes pop { from { opacity: 0; transform: translate(-50%, 8px); } }
.fade-in { animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } }

/* Postavke (admin) */
.setting { display: flex; align-items: center; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--border); cursor: pointer; }
.setting:last-of-type { border-bottom: 0; }
.setting-text { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.switch { position: relative; width: 48px; height: 28px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; position: absolute; }
.slider { position: absolute; inset: 0; background: var(--border); border-radius: 999px; transition: .2s; }
.slider::before { content: ''; position: absolute; width: 22px; height: 22px; left: 3px; top: 3px; background: #fff; border-radius: 50%; transition: .2s; box-shadow: 0 1px 3px rgba(0,0,0,.2); }
.switch input:checked + .slider { background: var(--primary); }
.switch input:checked + .slider::before { transform: translateX(20px); }
.switch input:focus-visible + .slider { box-shadow: 0 0 0 4px var(--primary-soft); }

/* Uvoz kviza */
.import-box summary { cursor: pointer; list-style: none; }
.import-box summary::-webkit-details-marker { display: none; }
.import-box summary::after { content: ' ▾'; color: var(--muted); }
.import-box[open] summary::after { content: ' ▴'; }
.import-box code { background: var(--surface-2); padding: 1px 6px; border-radius: 6px; font-size: 12px; overflow-wrap: anywhere; }