:root { --main: #ff9f43; --sec: #54a0ff; --dark: #2d3436; --bg: #f4f7f6; }
* { box-sizing: border-box; }
body { font-family: 'Sarabun', sans-serif; margin: 0; background: var(--bg); color: var(--dark); line-height: 1.6; }
header { background: #fff; padding: 15px 0; border-bottom: 2px solid #eee; position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }
.nav-container { max-width: 1200px; margin: auto; display: flex; justify-content: space-between; align-items: center; padding: 0 20px; }
.logo { font-size: 24px; font-weight: bold; color: var(--main); text-decoration: none; }
nav a { text-decoration: none; color: var(--dark); margin-left: 15px; font-size: 14px; font-weight: bold; transition: 0.3s; }
nav a:hover { color: var(--main); }
.container { max-width: 1100px; margin: 20px auto; padding: 40px 20px; background: #fff; border-radius: 15px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); }
h1, h2 { color: var(--main); text-align: center; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-top: 30px; }
.card { background: #fff; padding: 20px; border: 1px solid #eee; border-radius: 15px; text-align: center; }
.buy-btn { background: #2ecc71; color: #fff; border: none; padding: 12px 25px; border-radius: 5px; cursor: pointer; font-weight: bold; text-align: center; display: inline-block; text-decoration: none; margin-top: 10px; }
.buy-btn:hover { background: #27ae60; }
footer { background: var(--dark); color: #fff; padding: 30px 0; text-align: center; margin-top: 50px; }
.line-float { position: fixed; bottom: 20px; right: 20px; background: #00b900; color: white; padding: 15px 25px; border-radius: 50px; text-decoration: none; font-weight: bold; z-index: 1000; box-shadow: 0 4px 10px rgba(0,0,0,0.2); }