*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root, [data-theme="light"] {
  --accent: #5865F2;
  --accent-hover: #4752c4;
  --bg: #f5f5f5;
  --card-bg: #ffffff;
  --card-border: #e5e7eb;
  --input-bg: #f9fafb;
  --input-border: #d1d5db;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --hint-color: #9ca3af;
  --error-bg: rgba(239,68,68,0.06);
  --error-border: rgba(239,68,68,0.2);
  --error-text: #dc2626;
  --bot-bg: linear-gradient(135deg, rgba(88,101,242,0.06), rgba(88,101,242,0.02));
  --bot-border: rgba(88,101,242,0.2);
  --pay-bg: #f9fafb;
  --pay-border: #e5e7eb;
  --pay-active-bg: rgba(88,101,242,0.06);
  --pay-text: #6b7280;
  --secure-color: #9ca3af;
  --link-color: #6b7280;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --valid-color: #16a34a;
  --invalid-color: #dc2626;
  --warn-color: #ca8a04;
  --check-color: #6b7280;
  --server-info: #111827;
  --btn-shadow: 0 1px 3px rgba(88,101,242,0.2);
  --status-green-bg: rgba(22,163,74,0.08); --status-green: #16a34a;
  --status-yellow-bg: rgba(202,138,4,0.08); --status-yellow: #ca8a04;
  --status-red-bg: rgba(220,38,38,0.08); --status-red: #dc2626;
  --status-blue-bg: rgba(88,101,242,0.08); --status-blue: #5865F2;
}

[data-theme="dark"] {
  --bg: #0a0a0a;
  --card-bg: #161616;
  --card-border: #262626;
  --input-bg: #0a0a0a;
  --input-border: #333;
  --text-primary: #ffffff;
  --text-secondary: #888;
  --text-muted: #555;
  --hint-color: #555;
  --error-bg: rgba(239,68,68,0.1);
  --error-border: rgba(239,68,68,0.3);
  --error-text: #f87171;
  --bot-bg: linear-gradient(135deg, rgba(88,101,242,0.08), rgba(88,101,242,0.03));
  --bot-border: rgba(88,101,242,0.25);
  --pay-bg: #0a0a0a;
  --pay-border: #262626;
  --pay-active-bg: rgba(88,101,242,0.08);
  --pay-text: #aaa;
  --secure-color: #555;
  --link-color: #666;
  --shadow: none;
  --valid-color: #3ba55d;
  --invalid-color: #ed4245;
  --warn-color: #faa81a;
  --check-color: #8b8fa8;
  --server-info: #fff;
  --btn-shadow: 0 4px 14px rgba(88,101,242,0.3);
  --status-green-bg: rgba(34,197,94,0.15); --status-green: #22c55e;
  --status-yellow-bg: rgba(234,179,8,0.15); --status-yellow: #eab308;
  --status-red-bg: rgba(239,68,68,0.15); --status-red: #ef4444;
  --status-blue-bg: rgba(88,101,242,0.15); --status-blue: #5865F2;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg); color: var(--text-secondary);
  min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px;
}

.checkout-wrap, .container { width: 100%; max-width: 480px; }
.checkout-wrap { max-width: 920px; }
.logo-row { text-align: center; margin-bottom: 32px; }
.logo-row a { display: inline-block; text-decoration: none; }
.logo-img { height: 40px; width: auto; }

.checkout-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 24px; align-items: start; }
.section-title { font-size: 18px; font-weight: 600; color: var(--text-primary); margin-bottom: 20px; }
.required { color: var(--accent); }

.summary-card { position: sticky; top: 24px; }
.summary-product { display: flex; align-items: center; gap: 10px; padding: 16px 0; border-bottom: 1px solid var(--card-border); margin-bottom: 12px; }
.summary-product-name { flex: 1; font-size: 15px; font-weight: 600; color: var(--text-primary); }
.summary-product-qty { font-size: 12px; font-weight: 600; color: #fff; background: var(--accent); border-radius: 4px; padding: 1px 6px; }
.summary-product-price { font-size: 15px; font-weight: 600; color: var(--text-primary); }
.summary-row { display: flex; justify-content: space-between; padding: 10px 0; font-size: 14px; border-bottom: 1px solid var(--card-border); }
.summary-total { border-bottom: none; padding-top: 14px; }
.summary-total-amount { font-size: 20px; font-weight: 700; color: var(--accent); }
.payment-title { font-size: 14px; font-weight: 600; color: var(--text-primary); margin: 20px 0 10px; }

.form-card, .order-box {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: 12px; padding: 24px; margin-bottom: 20px; box-shadow: var(--shadow);
}

.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13px; font-weight: 500; color: var(--text-secondary); margin-bottom: 6px; }
.field input { width: 100%; padding: 12px 14px; background: var(--input-bg); border: 1px solid var(--input-border); border-radius: 8px; color: var(--text-primary); font-size: 15px; outline: none; }
.field input:focus { border-color: var(--accent); }
.field .hint { font-size: 12px; color: var(--hint-color); margin-top: 4px; }

.payment-options { display: grid; gap: 10px; margin-bottom: 20px; }
.pay-option { position: relative; }
.pay-option input { position: absolute; opacity: 0; }
.pay-option label { display: flex; flex-direction: row; align-items: center; gap: 6px; padding: 14px 16px; background: var(--pay-bg); border: 2px solid var(--pay-border); border-radius: 10px; cursor: pointer; font-size: 14px; color: var(--pay-text); }
.pay-option input:checked + label { border-color: var(--accent); background: var(--pay-active-bg); color: var(--text-primary); }

.error-msg { background: var(--error-bg); border: 1px solid var(--error-border); color: var(--error-text); padding: 12px 16px; border-radius: 8px; font-size: 14px; margin-bottom: 18px; }

.submit-btn { display: block; width: 100%; padding: 14px; background: var(--accent); color: #fff; border: none; border-radius: 10px; font-size: 16px; font-weight: 600; cursor: pointer; box-shadow: var(--btn-shadow); }
.submit-btn:hover { background: var(--accent-hover); }
.submit-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.secure-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--pay-active-bg);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-top: 8px;
}

.trust-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 20px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 16px;
}

.trust-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.trust-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: var(--pay-active-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.trust-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.trust-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.45;
}

.card-icons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
  opacity: 0.75;
}

.payment-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.pay-badge {
  font-size: 11px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text-muted);
}

.secure-note { text-align: center; margin-top: 16px; font-size: 12px; color: var(--secure-color); }
.back-link { text-align: center; margin-top: 20px; }
.back-link a { color: var(--link-color); text-decoration: none; font-size: 13px; }

.validate-status { margin-top: 8px; padding: 10px 14px; border-radius: 8px; font-size: 13px; }
.validate-valid { background: rgba(22,163,74,0.08); border: 1px solid var(--valid-color); color: var(--valid-color); }
.validate-invalid { background: rgba(220,38,38,0.08); border: 1px solid var(--invalid-color); color: var(--invalid-color); }
.validate-warning { background: rgba(202,138,4,0.08); border: 1px solid var(--warn-color); color: var(--warn-color); }
.input-valid { border-color: var(--valid-color) !important; }
.input-invalid { border-color: var(--invalid-color) !important; }

.check-icon { width: 64px; height: 64px; background: var(--status-green-bg); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 24px; font-size: 32px; color: var(--status-green); }
.container h1 { font-size: 24px; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; text-align: center; }
.subtitle { color: var(--text-secondary); font-size: 15px; margin-bottom: 28px; line-height: 1.5; text-align: center; }
.order-box .row { display: flex; justify-content: space-between; padding: 10px 0; font-size: 14px; }
.order-box .row:not(:last-child) { border-bottom: 1px solid var(--card-border); }
.status-badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; text-transform: uppercase; }
.status-processing { background: var(--status-green-bg); color: var(--status-green); }
.status-pending { background: var(--status-yellow-bg); color: var(--status-yellow); }

.back-btn, .btn { display: inline-block; padding: 12px 28px; border-radius: 8px; font-size: 14px; font-weight: 500; text-decoration: none; margin: 4px; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-secondary { background: var(--card-bg); border: 1px solid var(--card-border); color: var(--text-primary); }
.text-center { text-align: center; }

@media (max-width: 768px) {
  .checkout-grid { grid-template-columns: 1fr; }
  .checkout-wrap { max-width: 480px; }
  .summary-card { position: static; }
}