:root {
    --ncs-primary: #0369a1;
    --ncs-primary-dark: #075985;
    --ncs-accent: #10b981;
    --ncs-danger: #dc2626;
    --ncs-soft: #f0f9ff;
}

body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: #1e293b; background: #fafbfc; }
.navbar-brand small { font-size: 0.75rem; }
.btn-primary { background: var(--ncs-primary); border-color: var(--ncs-primary); }
.btn-primary:hover { background: var(--ncs-primary-dark); border-color: var(--ncs-primary-dark); }

.hero {
    background: linear-gradient(135deg, #e0f2fe 0%, #f0fdf4 100%);
    padding: 80px 0;
    text-align: center;
}
.hero h1 { font-size: 2.8rem; font-weight: 800; color: #0f172a; }
.hero p.lead { font-size: 1.2rem; color: #475569; }

.feature-card {
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 24px;
    height: 100%;
    transition: transform .15s, box-shadow .15s;
    background: #fff;
}
.feature-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(3,105,161,.08); }
.feature-icon { font-size: 2rem; color: var(--ncs-primary); }

.pricing-card {
    border: 2px solid #e2e8f0;
    border-radius: 16px;
    padding: 32px 24px;
    height: 100%;
    background: #fff;
    position: relative;
}
.pricing-card.popular { border-color: var(--ncs-primary); }
.pricing-card.popular::before {
    content: 'Most Popular';
    position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
    background: var(--ncs-primary); color: #fff; padding: 4px 16px; border-radius: 20px; font-size: 0.8rem; font-weight: 600;
}
.price { font-size: 2.5rem; font-weight: 800; color: var(--ncs-primary); }
.price small { font-size: 1rem; color: #64748b; font-weight: 500; }

.stat-card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    border: 1px solid #e2e8f0;
}
.stat-value { font-size: 1.8rem; font-weight: 700; color: var(--ncs-primary); }
.stat-label { color: #64748b; font-size: 0.9rem; }

.question-card {
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    border: 1px solid #e2e8f0;
    margin-bottom: 16px;
}

.option-btn {
    display: block;
    width: 100%;
    text-align: left;
    padding: 12px 16px;
    margin-bottom: 8px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
    transition: all .15s;
}
.option-btn:hover { border-color: var(--ncs-primary); background: var(--ncs-soft); }
.option-btn.selected { border-color: var(--ncs-primary); background: var(--ncs-soft); font-weight: 600; }
.option-btn.correct { border-color: var(--ncs-accent); background: #ecfdf5; }
.option-btn.incorrect { border-color: var(--ncs-danger); background: #fef2f2; }

@media (max-width: 768px) {
    .hero { padding: 50px 0; }
    .hero h1 { font-size: 2rem; }
}