:root {
    --bg: #f4f6fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --ok: #16a34a;
    --bad: #dc2626;
    --warn: #f59e0b;
    --shadow: 0 2px 8px rgba(0,0,0,0.05);
    --radius: 10px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 15px;
    line-height: 1.5;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    display: flex; justify-content: space-between; align-items: center;
}
.topbar .brand { font-weight: 600; font-size: 18px; color: var(--text); }
.topbar nav a { margin-left: 16px; color: var(--muted); }

.container {
    max-width: 960px;
    margin: 24px auto;
    padding: 0 16px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}
.card.narrow { max-width: 480px; margin-left: auto; margin-right: auto; }

h1 { margin: 0 0 16px; font-size: 24px; }
h2 { margin: 0 0 12px; font-size: 18px; }
.muted { color: var(--muted); font-size: 14px; }
.muted.center { text-align: center; }
.small { font-size: 12px; }

.form { display: flex; flex-direction: column; gap: 14px; }
.form label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; }
.form input[type=text], .form input[type=email], .form input[type=number],
.form input[type=password], .form select, .form textarea {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font: inherit;
    background: #fff;
}
.form input:focus, .form select:focus, .form textarea:focus {
    outline: 2px solid var(--primary);
    outline-offset: -1px;
    border-color: var(--primary);
}
.req { color: var(--bad); }

.btn {
    display: inline-block;
    padding: 9px 16px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: #fff;
    cursor: pointer;
    font: inherit;
    color: var(--text);
    text-decoration: none;
}
.btn:hover { background: #f9fafb; text-decoration: none; }
.btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn.primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn.danger { color: var(--bad); border-color: #fecaca; }
.btn.danger:hover { background: #fef2f2; }
.btn.small { padding: 4px 10px; font-size: 13px; }
.btn.ghost { background: transparent; }

.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: 14px; }
.alert.error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert.ok { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }

/* Тест */
.test-card .test-head {
    display: flex; justify-content: space-between; align-items: center;
    border-bottom: 1px solid var(--border); padding-bottom: 16px; margin-bottom: 16px;
    gap: 16px;
}
.test-head.sticky-head {
    position: sticky;
    top: 0;
    background: #fff;
    padding-top: 16px;
    z-index: 10;
    margin: -24px -24px 16px;
    padding-left: 24px; padding-right: 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.timer-wrap { text-align: right; }
.timer {
    font-size: 28px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--primary);
}
.timer.warn { color: var(--warn); }
.timer.danger { color: var(--bad); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: 0.5; } }

/* По одному вопросу на экран */
.question {
    display: none;
    padding: 8px 0;
}
.question.active {
    display: block;
    animation: fadeIn .2s ease-out;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.q-num { font-size: 12px; color: var(--muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: .04em; }
.q-text { font-size: 16px; font-weight: 500; margin-bottom: 12px; }
.options { display: flex; flex-direction: column; gap: 8px; }
.option {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: background .1s, border-color .1s;
}
.option:hover { background: #f9fafb; }
.option input { margin-top: 4px; }
.option input:checked ~ .bullet { background: var(--primary); color: #fff; border-color: var(--primary); }
.option:has(input:checked) { background: #eff6ff; border-color: var(--primary); }
.bullet {
    display: inline-flex; align-items: center; justify-content: center;
    width: 24px; height: 24px;
    border-radius: 50%;
    border: 1px solid var(--border);
    font-size: 12px; font-weight: 600;
    background: #fff; flex-shrink: 0;
}
.opt-text { flex: 1; }

.submit-bar {
    position: sticky; bottom: 0;
    background: #fff;
    padding: 16px 0;
    margin-top: 16px;
    border-top: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: center;
}

/* Навигация Назад/Далее */
.nav-bar {
    display: flex; align-items: center; gap: 12px;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}
.nav-bar #progress { flex: 1; text-align: center; }
.nav-bar .btn:disabled { opacity: .4; cursor: not-allowed; }

/* Точки-индикаторы вопросов */
.dots {
    display: flex; flex-wrap: wrap; gap: 6px;
    margin-top: 16px; justify-content: center;
}
.dots .dot {
    width: 32px; height: 32px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: #fff;
    cursor: pointer;
    font-size: 12px; font-weight: 600;
    color: var(--muted);
    transition: all .15s;
    padding: 0;
}
.dots .dot:hover { background: #f3f4f6; }
.dots .dot.answered {
    background: #dcfce7;
    color: var(--ok);
    border-color: #86efac;
}
.dots .dot.current {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    transform: scale(1.1);
}
.dots .dot.current.answered {
    background: var(--primary);
    color: #fff;
}

/* Результат */
.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin: 20px 0;
}
.result-box, .stat {
    background: #f9fafb;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
}
.big { font-size: 28px; font-weight: 700; margin-top: 4px; }

/* Админка */
.admin-nav {
    display: flex; gap: 6px; flex-wrap: wrap;
    margin-bottom: 16px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px;
}
.admin-nav a {
    padding: 8px 14px;
    border-radius: 6px;
    color: var(--text);
}
.admin-nav a:hover { background: #f3f4f6; text-decoration: none; }
.admin-nav a.active { background: var(--primary); color: #fff; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
}

.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td {
    padding: 8px 10px; text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}
.table th { background: #f9fafb; font-weight: 600; font-size: 13px; }
.table tr:hover td { background: #f9fafb; }

.kv { width: 100%; border-collapse: collapse; }
.kv th { width: 180px; text-align: left; padding: 6px 0; color: var(--muted); font-weight: 500; }
.kv td { padding: 6px 0; }

.inline-form {
    display: flex; gap: 8px; align-items: center;
    margin-bottom: 16px;
}
.inline-form input[type=text] {
    padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px;
    flex: 1; max-width: 320px; font: inherit;
}

.row-between { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }

.answer-block {
    border-left: 4px solid var(--border);
    padding: 12px 16px;
    margin-bottom: 12px;
    background: #f9fafb;
    border-radius: 0 8px 8px 0;
}
.answer-block.ok   { border-color: var(--ok);   background: #f0fdf4; }
.answer-block.bad  { border-color: var(--bad);  background: #fef2f2; }
.answer-block.skip { border-color: var(--warn); background: #fffbeb; }

.opts { list-style: none; padding: 0; margin: 8px 0 0; }
.opts li {
    padding: 6px 0; display: flex; align-items: center; gap: 8px;
}
.opts li.right { color: var(--ok); font-weight: 500; }
.opts li.wrong { color: var(--bad); text-decoration: line-through; }
.tag {
    font-size: 11px;
    padding: 2px 6px;
    background: var(--primary); color: #fff;
    border-radius: 4px; margin-left: 4px;
}
.tag.right-tag { background: var(--ok); }

.footer {
    text-align: center; padding: 16px; color: var(--muted);
}

@media (max-width: 600px) {
    .test-head { flex-direction: column; align-items: flex-start; gap: 8px; }
    .timer-wrap { text-align: left; }
    .table { font-size: 13px; }
    .table th, .table td { padding: 6px 8px; }
}