/* ZGZSNet - Health Knowledge Portal */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #1a5f4a;
    --secondary: #2d8a6e;
    --accent: #3cb371;
    --highlight: #20b2aa;
    --text: #333333;
    --text-light: #666666;
    --bg-light: #f8faf9;
    --card-bg: #ffffff;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-light);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
}

.navbar {
    background: var(--primary);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: #fff;
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-links a {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 6px;
    transition: background 0.3s;
    font-size: 0.95rem;
}

.nav-links a:hover, .nav-links a.active {
    background: rgba(255,255,255,0.2);
    color: #fff;
}

.hero {
    background: linear-gradient(135deg, #1a5f4a 0%, #2d8a6e 100%);
    padding: 60px 20px;
    text-align: center;
    color: #fff;
}

.hero h1 { font-size: 2.5rem; margin-bottom: 0.5rem; }
.hero p { font-size: 1.1rem; opacity: 0.9; max-width: 600px; margin: 0 auto; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
}

.tests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.test-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s;
    border-left: 4px solid var(--accent);
    text-decoration: none;
    color: inherit;
    display: block;
}

.test-card:hover {
    transform: translateY(-5px);
}

.test-card h3 { color: var(--primary); margin-bottom: 8px; font-size: 1.1rem; }
.test-card p { color: var(--text-light); font-size: 0.9rem; margin-bottom: 10px; }
.test-card .tag {
    display: inline-block;
    background: #e8f5e9;
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
}

.category-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.category-tab {
    background: var(--card-bg);
    border: 2px solid var(--accent);
    color: var(--primary);
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.95rem;
}

.category-tab:hover, .category-tab.active {
    background: var(--accent);
    color: #fff;
}

.articles-list {
    display: grid;
    gap: 20px;
}

.article-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    border-left: 4px solid var(--accent);
}

.article-card h2 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.article-card h2 a { color: var(--primary); text-decoration: none; }
.article-card p { color: var(--text-light); }

.article-meta {
    display: flex;
    gap: 15px;
    font-size: 0.85rem;
    color: #888;
}

.content {
    max-width: 800px;
    margin: 0 auto;
    padding: 30px 20px;
}

.content h1 { font-size: 2rem; color: var(--primary); margin-bottom: 1rem; }
.content h2 { font-size: 1.5rem; color: #2d5a45; margin: 1.5rem 0 0.8rem; }
.content h3 { font-size: 1.2rem; color: #3d6a55; margin: 1.2rem 0 0.6rem; }
.content p { font-size: 1rem; line-height: 1.8; margin-bottom: 1rem; color: var(--text); }

.content img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    margin: 1rem 0;
    display: block;
}

.content a { color: var(--secondary); }
.content ul, .content ol { margin: 1rem 0 1.5rem 1.5rem; }
.content li { margin-bottom: 0.5rem; color: var(--text); }

.related-content {
    background: #e8f5e9;
    padding: 20px;
    border-radius: 10px;
    margin-top: 2rem;
}

.related-content h3 { color: var(--primary); margin-bottom: 1rem; }
.related-content ul { list-style: none; margin: 0; }
.related-content li { margin-bottom: 0.5rem; }
.related-content a { color: var(--secondary); text-decoration: none; }

.test-wrapper {
    max-width: 800px;
    margin: 0 auto;
    padding: 30px 20px;
}

.test-question {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

.test-question h3 { color: var(--primary); margin-bottom: 15px; font-size: 1.1rem; }

.option {
    display: block;
    padding: 14px 18px;
    margin-bottom: 10px;
    background: #f8faf9;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.option:hover { border-color: var(--accent); background: #e8f5e9; }
.btn {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1rem;
    margin-top: 20px;
}
.btn:hover { background: var(--secondary); }

footer {
    background: var(--primary);
    color: rgba(255,255,255,0.9);
    padding: 30px 20px;
    text-align: center;
    margin-top: 40px;
}

footer a { color: #fff; text-decoration: none; }

.adsense-placeholder {
    background: #f0f0f0;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    margin: 20px 0;
    color: #999;
}

@media (max-width: 768px) {
    .nav-container { flex-direction: column; text-align: center; }
    .nav-links { justify-content: center; }
    .hero h1 { font-size: 1.8rem; }
    .hero p { font-size: 1rem; }
    .tests-grid { grid-template-columns: 1fr; }
    .content h1 { font-size: 1.6rem; }
}

.option.correct { background: #d4edda !important; border-color: #28a745 !important; color: #155724; }
.option.incorrect { background: #f8d7da !important; border-color: #dc3545 !important; color: #721c24; }