* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, 'Microsoft YaHei', sans-serif; background: #f5f5f5; color: #333; }

/* Home page centered layout */
body.center-page { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.center-box { text-align: center; padding: 20px; }
.logo-row { display: flex; align-items: center; justify-content: center; gap: 14px; }
.logo-img { width: 96px; height: 96px; border-radius: 20px; }
.site-title { font-size: 44px; color: #fff; margin: 0; }
.site-subtitle { font-size: 18px; color: rgba(255,255,255,0.85); margin-top: 10px; }
.nav-row { margin-top: 28px; display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.nav-btn { display: inline-block; padding: 10px 28px; background: rgba(255,255,255,0.2); color: #fff; text-decoration: none; border-radius: 24px; font-size: 16px; transition: background 0.2s; }
.nav-btn:hover { background: rgba(255,255,255,0.35); }

/* Other pages */
.header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: #fff; text-align: center; padding: 30px 20px; }
.back-link { color: #fff; text-decoration: underline; font-size: 13px; display: inline-block; margin-top: 8px; }
.container { max-width: 900px; margin: 0 auto; padding: 20px; }
.footer { text-align: center; padding: 30px 20px; color: rgba(255,255,255,0.6); font-size: 13px; }
.back-link { color: #fff; text-decoration: underline; font-size: 13px; display: inline-block; margin-top: 8px; }
.brand-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; margin-top: 10px; }
.brand-card { background: #fff; border-radius: 12px; padding: 20px; text-decoration: none; color: inherit; box-shadow: 0 2px 8px rgba(0,0,0,0.08); transition: transform 0.2s, box-shadow 0.2s; }
.brand-card:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(0,0,0,0.12); }
.brand-card-body h2 { font-size: 20px; margin-bottom: 6px; color: #333; }
.brand-card-body p { font-size: 13px; color: #666; line-height: 1.5; }
.coupon-badge { display: inline-block; margin-top: 10px; background: #ff6b6b; color: #fff; padding: 3px 12px; border-radius: 20px; font-size: 12px; }
.coupon-list { display: flex; flex-direction: column; gap: 16px; margin-top: 10px; }
.coupon-card { background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.coupon-main { background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%); padding: 20px; text-align: center; }
.coupon-discount { font-size: 24px; font-weight: bold; color: #e74c3c; margin-bottom: 4px; }
.coupon-title { font-size: 14px; color: #666; }
.coupon-code-section { background: #fff; padding: 15px 20px; text-align: center; border-bottom: 1px dashed #ddd; }
.coupon-code-label { font-size: 12px; color: #999; }
.coupon-code { font-size: 28px; font-weight: bold; letter-spacing: 4px; color: #2c3e50; font-family: monospace; margin-top: 4px; }
.coupon-details { padding: 15px 20px; font-size: 13px; color: #666; line-height: 1.8; }
/* Admin */
.admin-login { max-width: 400px; margin: 40px auto; background: #fff; padding: 30px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.admin-section { background: #fff; border-radius: 12px; padding: 20px; margin-bottom: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.admin-section form { display: flex; flex-direction: column; gap: 10px; margin: 15px 0; }
.admin-section input, .admin-section select, .admin-section textarea { padding: 10px; border: 1px solid #ddd; border-radius: 8px; font-size: 14px; }
.admin-section button { padding: 10px; background: #667eea; color: #fff; border: none; border-radius: 8px; font-size: 14px; cursor: pointer; }
.admin-section button:hover { background: #5a6fd6; }
.admin-list { display: flex; flex-direction: column; gap: 8px; }
.admin-item { display: flex; justify-content: space-between; align-items: center; padding: 10px; background: #f9f9f9; border-radius: 8px; font-size: 13px; }
.admin-item strong { min-width: 120px; }
.admin-item span { flex: 1; color: #666; }
.btn-small { padding: 4px 10px !important; font-size: 12px !important; }
.btn-danger { background: #e74c3c !important; }
.btn-danger:hover { background: #c0392b !important; }
.success { background: #d4edda; color: #155724; padding: 10px; border-radius: 8px; margin-bottom: 15px; }
.error { background: #f8d7da; color: #721c24; padding: 10px; border-radius: 8px; margin-bottom: 15px; }

@media (max-width: 600px) {
  .site-title { font-size: 28px; }
  .logo-img { width: 64px; height: 64px; }
  .nav-btn { padding: 8px 20px; font-size: 14px; }
  .brand-grid { grid-template-columns: 1fr; }
  .coupon-code { font-size: 22px; }
}