:root {
    --primary: #276749;
    --primary-light: #38a169;
    --bg: #f4f7f5;
    --card-bg: #ffffff;
    --text: #1a202c;
    --text-muted: #4a5568;
    --border: #e2e8f0;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.65; }
header { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.nav-container { max-width: 1100px; margin: 0 auto; padding: 15px 20px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
.logo { font-size: 1.5rem; font-weight: 800; color: var(--primary); text-decoration: none; display: flex; align-items: center; gap: 8px; }
nav a { margin-left: 22px; text-decoration: none; color: var(--text-muted); font-weight: 500; transition: color 0.2s; }
nav a:hover, nav a.active { color: var(--primary); }
.hero { background: linear-gradient(135deg, #22543d 0%, #2f855a 100%); color: #fff; padding: 60px 20px; text-align: center; }
.hero h1 { font-size: 2.5rem; margin-bottom: 15px; }
.hero p { font-size: 1.15rem; max-width: 650px; margin: 0 auto 25px; opacity: 0.92; }
.btn { display: inline-block; background: #fff; color: var(--primary); padding: 12px 24px; border-radius: 6px; font-weight: 600; text-decoration: none; cursor: pointer; border: none; transition: transform 0.15s; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--primary); color: #fff; }
.container { max-width: 1100px; margin: 40px auto; padding: 0 20px; }
.filters { display: flex; gap: 10px; margin-bottom: 25px; flex-wrap: wrap; }
.filter-btn { padding: 8px 16px; border: 1px solid var(--border); background: #fff; border-radius: 20px; cursor: pointer; font-size: 0.9rem; color: var(--text-muted); }
.filter-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 25px; }
.card { background: var(--card-bg); border-radius: 10px; overflow: hidden; border: 1px solid var(--border); display: flex; flex-direction: column; transition: box-shadow 0.2s; }
.card:hover { box-shadow: 0 10px 20px rgba(0,0,0,0.06); }
.card-banner { height: 140px; background: #e6fffa; display: flex; align-items: center; justify-content: center; font-size: 3rem; }
.card-body { padding: 22px; flex-grow: 1; display: flex; flex-direction: column; }
.tag { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.5px; color: var(--primary-light); font-weight: 700; margin-bottom: 8px; }
.card h3 { font-size: 1.25rem; margin-bottom: 10px; color: var(--text); }
.card p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 18px; flex-grow: 1; }
.card-footer { font-size: 0.85rem; color: #718096; display: flex; justify-content: space-between; align-items: center; border-top: 1px solid var(--border); padding-top: 12px; }
.article-box { background: #fff; padding: 35px; border-radius: 10px; border: 1px solid var(--border); margin-bottom: 30px; }
.article-box h2 { color: var(--primary); margin-bottom: 12px; font-size: 1.7rem; }
.article-box h3 { margin: 20px 0 10px; color: var(--text); }
.article-box p { margin-bottom: 14px; color: var(--text-muted); }
.article-box ul { margin: 10px 0 18px 22px; color: var(--text-muted); }
.calc-form { background: #fff; padding: 30px; border-radius: 10px; border: 1px solid var(--border); max-width: 600px; margin: 0 auto; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; }
.form-group select, .form-group input { width: 100%; padding: 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 1rem; }
.result-box { margin-top: 20px; padding: 18px; background: #ebf8ff; border-left: 4px solid #3182ce; border-radius: 4px; display: none; }
.newsletter { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 35px; text-align: center; margin-top: 50px; }
.newsletter form { display: flex; gap: 10px; max-width: 450px; margin: 20px auto 0; }
.newsletter input { flex-grow: 1; padding: 10px 14px; border: 1px solid var(--border); border-radius: 6px; }
footer { background: #1a202c; color: #a0aec0; padding: 40px 20px; margin-top: 60px; font-size: 0.9rem; }
.footer-inner { max-width: 1100px; margin: 0 auto; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 20px; }