.checkout-layout { display: grid; grid-template-columns: 1fr 1.1fr; gap: var(--space-12); align-items: start; padding-top: calc(var(--nav-height) + 48px); padding-bottom: var(--space-24); }
.checkout-sidebar { position: sticky; top: calc(var(--nav-height) + 32px + 48px); }
.checkout-sidebar__title { font-size: var(--text-2xl); font-weight: var(--weight-bold); margin-bottom: var(--space-2); }
.checkout-sidebar__sub { font-size: var(--text-sm); color: var(--color-text-secondary); margin-bottom: var(--space-8); line-height: var(--leading-relaxed); }

/* Step Indicator */
.step-indicator { display: flex; flex-direction: column; gap: 0; margin-bottom: var(--space-8); }
.step-indicator__item {
  display: flex; align-items: flex-start; gap: var(--space-4); position: relative; padding-bottom: var(--space-6);
}
.step-indicator__item:last-child { padding-bottom: 0; }
.step-indicator__item::before {
  content: ''; position: absolute; left: 15px; top: 32px;
  width: 2px; height: calc(100% - 16px);
  background: var(--color-border);
}
.step-indicator__item:last-child::before { display: none; }
.step-indicator__item.active::before { background: linear-gradient(to bottom, var(--color-accent), var(--color-border)); }
.step-indicator__item.done::before { background: var(--color-accent); }
.step-indicator__dot {
  width: 32px; height: 32px; flex-shrink: 0; border-radius: var(--radius-full);
  background: white; border: 2px solid var(--color-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-family: var(--font-mono); font-weight: var(--weight-bold);
  color: var(--color-text-muted); transition: all var(--transition-base);
}
.step-indicator__item.active .step-indicator__dot {
  background: var(--color-accent); border-color: var(--color-accent);
  color: white; box-shadow: 0 0 16px rgba(255,107,43,0.5);
}
.step-indicator__item.done .step-indicator__dot { background: rgba(255,107,43,0.15); border-color: var(--color-accent); color: var(--color-accent); }
.step-indicator__text strong { display: block; font-size: var(--text-sm); font-weight: var(--weight-semibold); }
.step-indicator__text span { font-size: var(--text-xs); color: var(--color-text-muted); }

/* Form Panel */
.checkout-panel {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
}
.checkout-panel__title { font-size: var(--text-xl); font-weight: var(--weight-bold); margin-bottom: var(--space-6); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.form-group { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-4); }
.form-group label { font-size: var(--text-xs); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: var(--tracking-widest); color: var(--color-text-muted); }
.form-group input, .form-group select, .form-group textarea {
  background: white; border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm); font-family: var(--font-sans); color: var(--color-text-primary);
  outline: none; transition: all var(--transition-fast); width: 100%;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--color-border-accent); background: rgba(255,107,43,0.04);
}
.form-group select option { background: var(--color-bg-elevated); }
.form-group textarea { resize: vertical; min-height: 100px; }

/* Cart Summary */
.cart-summary { background: rgba(255,107,43,0.04); border: 1px solid var(--color-border-accent); border-radius: var(--radius-xl); padding: var(--space-5); margin-bottom: var(--space-6); }
.cart-summary__title { font-size: var(--text-xs); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: var(--tracking-widest); color: var(--color-accent); margin-bottom: var(--space-4); }
.cart-item { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3) 0; border-bottom: 1px solid var(--color-border); }
.cart-item:last-child { border-bottom: none; }
.cart-item__img { width: 48px; height: 48px; object-fit: contain; filter: drop-shadow(0 4px 8px rgba(0,0,0,0.4)); }
.cart-item__info { flex: 1; }
.cart-item__name { font-size: var(--text-sm); font-weight: var(--weight-semibold); }
.cart-item__lot { font-size: 11px; font-family: var(--font-mono); color: var(--color-text-muted); }

/* Lot selector */
.lot-selector { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-bottom: var(--space-4); }
.lot-btn {
  padding: var(--space-2) var(--space-4); font-size: var(--text-xs); font-family: var(--font-mono);
  background: white; border: 1px solid var(--color-border);
  border-radius: var(--radius-md); color: var(--color-text-muted); cursor: pointer; transition: all var(--transition-fast);
}
.lot-btn:hover { border-color: var(--color-border-accent); color: var(--color-accent); }
.lot-btn.active { background: rgba(255,107,43,0.12); border-color: var(--color-accent); color: var(--color-accent); }

/* PCI Badge */
.pci-badge {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: rgba(34,197,94,0.05); border: 1px solid rgba(34,197,94,0.2);
  border-radius: var(--radius-lg); margin-bottom: var(--space-4);
  font-size: var(--text-xs); color: #4ade80;
}
.pci-badge svg { flex-shrink: 0; }

/* Payment mock */
.payment-field-mock {
  background: white; border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-4); margin-bottom: var(--space-3);
  font-size: var(--text-sm); font-family: var(--font-mono); color: var(--color-text-muted);
  letter-spacing: 0.1em;
}

/* Verified Badge */
.verified-badge {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(34,197,94,0.08); border: 1px solid rgba(34,197,94,0.25);
  border-radius: var(--radius-full); font-size: var(--text-xs); color: #4ade80;
  font-family: var(--font-mono); font-weight: var(--weight-semibold);
  margin-bottom: var(--space-6);
}
.verified-badge::before { content: '●'; color: #4ade80; font-size: 8px; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.3} }

@media (max-width: 900px) { .checkout-layout { grid-template-columns: 1fr; } .checkout-sidebar { position: static; } .form-row { grid-template-columns: 1fr; } }

/* ── Light mode overrides ── */
.checkout-panel { background:white; border-color:var(--color-border); box-shadow:var(--shadow-card); }
.checkout-panel .form-group input,
.checkout-panel .form-group select,
.checkout-panel .form-group textarea { background:var(--color-grey-100); border-color:var(--color-border); color:var(--color-ink); }
.checkout-panel .form-group input:focus,
.checkout-panel .form-group select:focus,
.checkout-panel .form-group textarea:focus { background:white; border-color:rgba(255,107,43,0.4); box-shadow:0 0 0 3px rgba(255,107,43,0.08); }
.checkout-panel .form-group label { color:var(--color-text-muted); }
.checkout-sidebar__title { color:var(--color-ink); }
.step-indicator__dot { background:var(--color-grey-100); border-color:var(--color-border); color:var(--color-grey-400); }
.step-indicator__item::before { background:var(--color-border); }
.cart-summary { background:rgba(255,107,43,0.04); }
.payment-field-mock { background:var(--color-grey-100); border-color:var(--color-border); color:var(--color-grey-400); }