:root {
    --brand-deep-green: #4a6741;
    --brand-light-green: #a5c259;
    --brand-red: #e53935;
    --brand-gold: #d4af37; /* Plus系列專用金 */
    --bg-cream: #fdfdfb;
    --white: #ffffff;
    --text-dark: #2c3e50;
}

* { box-sizing: border-box; scroll-behavior: smooth; }
body {
    font-family: "Helvetica Neue", "PingFang TC", "Microsoft JhengHei", sans-serif;
    margin: 0; color: var(--text-dark); background-color: var(--bg-cream); line-height: 1.8;
}

/* 導覽列 */
nav {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 6%; background: rgba(255, 255, 255, 0.98);
    position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.logo-container { display: flex; align-items: center; text-decoration: none; }
.logo-img { height: 90px; margin-right: 12px; }
.logo-text { font-size: 1.8rem; font-weight: 800; color: var(--brand-deep-green); }

.nav-links { display: flex; gap: 25px; }
.nav-links a { text-decoration: none; color: var(--brand-deep-green); font-weight: 600; font-size: 1rem; transition: 0.3s; }
.nav-links a:hover { color: var(--brand-red); }

/* 通用設定 */
.section { padding: 60px 10%; }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { font-size: 2.2rem; color: var(--brand-deep-green); margin: 0; }
.line { width: 50px; height: 3px; background: var(--brand-red); margin: 15px auto; }

/* 產品卡片通用樣式 */
.product-card { 
    background: white; border-radius: 15px; overflow: hidden; 
    box-shadow: 0 5px 15px rgba(0,0,0,0.05); margin-bottom: 30px; 
    display: grid; grid-template-columns: 300px 1fr;
}
.p-img { width: 100%; height: 100%; object-fit: cover; }
.p-content { padding: 30px; }
.efficacy-box { background: #f9fbf7; padding: 15px; border-radius: 8px; border-left: 4px solid var(--brand-light-green); margin: 15px 0; font-size: 0.9rem; }
.btn { display: inline-block; padding: 10px 20px; border-radius: 5px; text-decoration: none; font-weight: bold; font-size: 0.85rem; }

footer { background: #2c3e2d; color: #adb5bd; text-align: center; padding: 40px 0; margin-top: 50px; }
.footer-logo { height: 40px; margin-bottom: 15px; }

@media (max-width: 768px) {
    .product-card { grid-template-columns: 1fr; }
    .section { padding: 40px 5%; }
}