:root {
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #172033;
    --muted: #6b7280;
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --border: #e5e7eb;
    --success: #15803d;
    --danger: #dc2626;
    --shadow: 0 10px 30px rgba(20, 30, 60, .07);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Tahoma, Arial, sans-serif;
    line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 32px)); margin: auto; }

.site-header {
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 20;
}
.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.brand { font-size: 22px; font-weight: 800; color: var(--primary); }
nav { display: flex; gap: 18px; color: var(--muted); }
nav a:hover { color: var(--primary); }

.hero {
    padding: 52px 0 32px;
}
.hero h1 { margin: 0 0 10px; font-size: clamp(30px, 5vw, 48px); }
.hero p { margin: 0; color: var(--muted); max-width: 720px; }

.quiz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 22px;
    padding: 20px 0 60px;
}
.quiz-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform .2s, box-shadow .2s;
}
.quiz-card:hover { transform: translateY(-4px); box-shadow: 0 18px 40px rgba(20,30,60,.11); }
.quiz-card img { width: 100%; height: 170px; object-fit: cover; display: block; }
.quiz-body { padding: 18px; }
.quiz-body h3 { margin: 0 0 8px; }
.muted { color: var(--muted); }
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.badge {
    background: #eef2ff;
    color: #4338ca;
    border-radius: 999px;
    padding: 4px 10px;
    font-size: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 11px 17px;
    border-radius: 10px;
    border: 0;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    font-size: 15px;
}
.btn:hover { background: var(--primary-dark); }
.btn.secondary { background: #eef2ff; color: #3730a3; }
.btn.danger { background: #fee2e2; color: #991b1b; }

.quiz-wrap {
    max-width: 780px;
    margin: 40px auto 70px;
}
.quiz-top {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 20px;
    margin-bottom: 18px;
}
.progress {
    height: 8px;
    background: #e5e7eb;
    border-radius: 99px;
    overflow: hidden;
}
.progress > div { height: 100%; background: var(--primary); transition: width .2s; }
.timer {
    font-weight: 800;
    color: var(--primary);
    font-size: 20px;
}
.question-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 26px;
    box-shadow: var(--shadow);
}
.question-number { color: var(--muted); font-size: 14px; }
.question-text { font-size: 24px; font-weight: 800; margin: 8px 0 22px; }
.option {
    display: block;
    padding: 14px;
    margin: 10px 0;
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
}
.option:hover { border-color: var(--primary); background: #fafaff; }
.option input { margin-left: 8px; }
.quiz-actions { display: flex; justify-content: space-between; gap: 12px; margin-top: 22px; }

.form-card, .admin-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 22px;
    margin: 25px 0;
}
label { display: block; font-weight: 700; margin: 13px 0 7px; }
input, textarea, select {
    width: 100%;
    padding: 12px 13px;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    background: #fff;
    font: inherit;
}
textarea { min-height: 120px; resize: vertical; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: right; padding: 12px; border-bottom: 1px solid var(--border); }
.actions { display: flex; flex-wrap: wrap; gap: 8px; }

.result {
    text-align: center;
    padding: 40px 20px;
}
.score { font-size: 52px; font-weight: 900; color: var(--primary); }

.site-footer {
    padding: 30px 0;
    border-top: 1px solid var(--border);
    color: var(--muted);
    background: #fff;
    margin-top: 40px;
}

.alert {
    padding: 12px 15px;
    border-radius: 10px;
    margin: 15px 0;
    background: #fff7ed;
    color: #9a3412;
}

@media (max-width: 700px) {
    .grid-2 { grid-template-columns: 1fr; }
    .header-inner { align-items: flex-start; padding: 15px 0; }
    nav { flex-wrap: wrap; }
    .question-text { font-size: 20px; }
}

.quiz-controls{display:flex;gap:10px;justify-content:center;align-items:center;flex-wrap:wrap;margin:20px 0;padding:14px;border-top:1px solid #e5e7eb}.question-progress{font-weight:700;min-width:120px;text-align:center}.btn-danger{background:#dc2626!important;color:#fff!important}.result-page{max-width:900px;margin:40px auto}.result-card{background:#fff;border-radius:18px;padding:28px;box-shadow:0 8px 30px rgba(15,23,42,.08)}.result-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}.result-summary>div{background:#f8fafc;padding:16px;border-radius:12px;text-align:center}.result-summary strong{display:block;font-size:28px}.wrong-answer-card{background:#fff7f7;border:1px solid #fecaca;border-radius:14px;padding:16px;margin:14px 0}.correct-answer{background:#f0fdf4;color:#166534;padding:10px;border-radius:8px}.success-box{background:#ecfdf5;color:#065f46;padding:16px;border-radius:12px}.result-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}

.account-nav-user{font-weight:800;color:var(--primary)}