:root {
  --primary: #1877F2;
  --primary-dark: #0c5dc7;
  --bg-body: #f0f2f5;
  --bg-white: #ffffff;
  --text-primary: #1a1a2e;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --accent-red: #E53935;
  --accent-gold: #F59E0B;
  --r-md: 12px;
  --r-lg: 18px;
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Be Vietnam Pro', sans-serif; background: var(--bg-body); color: var(--text-primary); line-height: 1.6; }

.topbar { background: #fff; border-bottom: 1px solid var(--border); padding: 12px 0; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 10px rgba(0,0,0,0.03); }
.topbar-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: flex; justify-content: space-between; align-items: center; }
.logo-link { text-decoration: none; display: flex; align-items: center; gap: 10px; }
.logo-link img { height: 45px; }
.back-home { color: var(--text-secondary); text-decoration: none; font-size: 13px; font-weight: 600; display: flex; align-items: center; gap: 6px; transition: color 0.2s; }
.back-home:hover { color: var(--primary); }

.checkout-container { max-width: 1200px; margin: 32px auto; padding: 0 20px; display: grid; grid-template-columns: 1fr 400px; gap: 30px; }

.ck-section { background: #fff; border-radius: var(--r-lg); border: 1px solid var(--border); padding: 24px; box-shadow: var(--shadow-lg); margin-bottom: 20px; }
.section-title { font-size: 18px; font-weight: 800; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; border-bottom: 1px solid var(--border); padding-bottom: 15px; }
.section-title i { color: var(--primary); }

/* Cart Items */
.cart-list { display: flex; flex-direction: column; gap: 16px; }
.cart-item { display: grid; grid-template-columns: 60px 1fr auto; gap: 20px; align-items: center; padding: 15px; border: 1px solid var(--border); border-radius: var(--r-md); transition: all 0.2s; }
.cart-item:hover { border-color: var(--primary); background: #f8fafc; }
.item-icon { width: 60px; height: 60px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 24px; color: #fff; }
.item-details h4 { font-size: 15px; font-weight: 700; margin-bottom: 4px; color: var(--text-primary); }
.item-details p { font-size: 12px; color: var(--text-secondary); }
.item-price { font-weight: 800; color: var(--primary); font-size: 16px; }

.item-actions { display: flex; align-items: center; gap: 15px; }
.qty-btn { width: 30px; height: 30px; border-radius: 8px; border: 1px solid var(--border); background: #fff; cursor: pointer; transition: all 0.2s; font-weight: 700; }
.qty-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.qty-val { font-weight: 700; min-width: 20px; text-align: center; }
.remove-btn { color: var(--accent-red); background: none; border: none; cursor: pointer; padding: 5px; font-size: 16px; transition: transform 0.2s; }
.remove-btn:hover { transform: scale(1.2); }

/* Payment Methods */
.pay-methods { display: grid; gap: 12px; }
.pay-method { border: 1.5px solid var(--border); border-radius: var(--r-md); padding: 16px; cursor: pointer; transition: all 0.2s; display: flex; align-items: center; gap: 15px; }
.pay-method:hover { border-color: var(--primary); }
.pay-method.active { border-color: var(--primary); background: rgba(24,119,242,0.05); }
.pay-method input { width: 18px; height: 18px; }
.pay-method i { font-size: 20px; color: var(--primary); width: 25px; text-align: center; }
.pay-method-info { display: flex; flex-direction: column; }
.pay-method-name { font-weight: 700; font-size: 14px; }
.pay-method-desc { font-size: 11px; color: var(--text-secondary); }

/* Summary Card */
.summary-card { position: sticky; top: 100px; }
.summary-row { display: flex; justify-content: space-between; margin-bottom: 12px; font-size: 14px; }
.summary-row.total { border-top: 1px solid var(--border); margin-top: 15px; padding-top: 15px; font-size: 18px; font-weight: 800; }
.total-price { color: var(--accent-red); }

.buy-btn { width: 100%; padding: 16px; background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; border: none; border-radius: var(--r-md); font-size: 16px; font-weight: 800; cursor: pointer; transition: all 0.2s; box-shadow: 0 4px 15px rgba(24,119,242,0.3); margin-top: 20px; display: flex; align-items: center; justify-content: center; gap: 10px; }
.buy-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(24,119,242,0.4); }

/* Modal Payment */
.pay-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(8px); z-index: 2000; display: none; align-items: center; justify-content: center; padding: 20px; }
.pay-overlay.active { display: flex; animation: fadeIn 0.3s ease; }
.pay-modal { background: #fff; width: 100%; max-width: 500px; border-radius: var(--r-lg); overflow: hidden; box-shadow: 0 20px 50px rgba(0,0,0,0.3); }
.pm-header { background: var(--primary); color: #fff; padding: 18px 24px; display: flex; justify-content: space-between; align-items: center; }
.pm-body { padding: 24px; }
.qr-container { text-align: center; margin-bottom: 20px; padding: 20px; background: #f8fafc; border-radius: var(--r-md); }
.qr-container img { max-width: 200px; border-radius: 12px; border: 1px solid var(--border); }
.bank-info { text-align: center; margin-bottom: 20px; }
.bank-name { font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.bank-stk { font-size: 18px; font-weight: 900; letter-spacing: 1px; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

@media (max-width: 992px) {
  .checkout-container { grid-template-columns: 1fr; }
  .summary-card { position: static; }
}