:root {
  --bg: #050705;
  --bg-2: #0c100e;
  --card: #121816;
  --card-2: #171d1a;
  --border: #243028;
  --border-soft: #1c2420;
  --text: #f3f6f4;
  --muted: #8b968f;
  --green: #39e26a;
  --green-2: #2bc85a;
  --green-dim: rgba(57, 226, 106, 0.15);
  --danger: #ff5c5c;
  --radius: 16px;
  --font: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 500px at 50% -10%, rgba(57, 226, 106, 0.08), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
}

a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
.hidden { display: none !important; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  border-bottom: 1px solid var(--border-soft);
  background: rgba(5, 7, 5, 0.85);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #fff;
}
.brand img {
  height: 34px;
  width: auto;
  display: block;
  /* Logo SVG paths are black — invert for dark checkout header */
  filter: brightness(0) invert(1);
}
.brand-text { font-size: 18px; color: #fff; }
.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  color: #fff;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 0;
}
.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
}
.top-nav {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.top-nav a {
  color: #d7e0da;
  font-size: 14px;
  font-weight: 600;
}
.top-nav a:hover { color: var(--green); }
.back-shop { color: #d7e0da; font-size: 14px; }
.back-shop:hover { color: var(--green); }

.checkout {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 80px;
}

.steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 34px;
}
.step {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}
.step .num {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid #3a4540;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  background: #0f1412;
}
.step .label { font-size: 14px; font-weight: 600; }
.step.active { color: var(--text); }
.step.active .num {
  background: var(--green);
  border-color: var(--green);
  color: #041208;
}
.step.done .num {
  background: var(--green-dim);
  border-color: var(--green);
  color: var(--green);
}
.step-line {
  width: 48px;
  height: 2px;
  background: #2a342f;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 24px;
  align-items: start;
}

.panel { display: flex; flex-direction: column; gap: 18px; }

.cart-item {
  display: grid;
  grid-template-columns: 88px 1fr auto;
  gap: 16px;
  padding: 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.cart-item img {
  width: 88px;
  height: 88px;
  object-fit: contain;
  background: #0a0e0c;
  border-radius: 12px;
}
.cart-item h4 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.35;
  font-weight: 700;
}
.stock {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--green);
  font-size: 13px;
  margin-bottom: 12px;
}
.stock::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(57, 226, 106, 0.18);
}
.meta-line {
  color: var(--muted);
  font-size: 12px;
  margin: -4px 0 10px;
}
.qty {
  display: inline-flex;
  align-items: center;
  background: #0a0e0c;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.qty button {
  width: 36px;
  height: 34px;
  border: 0;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
.qty span {
  min-width: 28px;
  text-align: center;
  font-weight: 600;
}
.item-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}
.item-price {
  font-size: 18px;
  font-weight: 700;
}
.remove-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  padding: 0;
}
.remove-btn:hover { color: var(--danger); }

.empty-cart {
  text-align: center;
  padding: 60px 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.empty-cart h2 { margin: 0 0 8px; }
.empty-cart p { color: var(--muted); margin: 0 0 22px; }

.btn-green {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--green);
  color: #041208;
  font-weight: 700;
  border: 0;
  border-radius: 12px;
  padding: 12px 18px;
  cursor: pointer;
}
.btn-green:hover { background: var(--green-2); }

.upsell h3 {
  margin: 8px 0 14px;
  font-size: 18px;
}
.upsell-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
.upsell-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 100%;
}
.upsell-card img {
  width: 100%;
  height: 90px;
  object-fit: contain;
  background: #0a0e0c;
  border-radius: 10px;
}
.upsell-card .t {
  font-size: 13px;
  line-height: 1.3;
  font-weight: 600;
  flex: 1;
}
.upsell-card .p {
  font-size: 14px;
  font-weight: 700;
}
.upsell-card button {
  border: 0;
  border-radius: 10px;
  background: var(--green);
  color: #041208;
  font-weight: 700;
  padding: 9px 10px;
  cursor: pointer;
}
.upsell-card button:hover { background: var(--green-2); }

.section-title {
  margin: 0 0 4px;
  font-size: 20px;
}

.option-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 22px;
}
.option-card {
  display: grid;
  grid-template-columns: 22px 1fr auto;
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  cursor: pointer;
}
.option-card.selected {
  border-color: #3d8f57;
  box-shadow: inset 0 0 0 1px rgba(57, 226, 106, 0.25);
}
.option-card input {
  margin-top: 3px;
  accent-color: #3b82f6;
}
.option-title { font-weight: 700; margin-bottom: 4px; }
.option-sub { color: var(--muted); font-size: 13px; line-height: 1.4; }
.option-price { font-weight: 700; white-space: nowrap; }
.option-price.free { color: var(--green); }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.form-grid label {
  display: flex;
  flex-direction: column;
  gap: 7px;
  font-size: 13px;
  color: var(--muted);
}
.form-grid .span-full { grid-column: 1 / -1; }
.form-grid .span-grow { grid-column: 1 / 2; }
.form-grid .span-narrow { grid-column: 2 / 3; }
.form-grid input {
  background: #0a0e0c;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 12px 14px;
  outline: none;
}
.form-grid input:focus {
  border-color: #3d8f57;
  box-shadow: 0 0 0 3px rgba(57, 226, 106, 0.12);
}

.secure-box {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 14px;
}
.secure-box .lock { font-size: 20px; filter: grayscale(0.2) sepia(1) hue-rotate(330deg) saturate(4); }
.secure-box strong { display: block; margin-bottom: 4px; }
.secure-box p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.4; }

.summary-card {
  position: sticky;
  top: 88px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.summary-card h3 {
  margin: 0 0 18px;
  font-size: 18px;
}
.summary-rows { display: flex; flex-direction: column; gap: 12px; margin-bottom: 16px; }
.row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 14px;
}
.row span:last-child, .row .total-stack { color: var(--text); font-weight: 600; }
.row.total {
  align-items: flex-start;
  padding-top: 10px;
  border-top: 1px solid var(--border-soft);
  color: var(--text);
  font-weight: 700;
}
.total-stack {
  text-align: right;
}
.total-stack strong {
  display: block;
  color: var(--green);
  font-size: 28px;
  line-height: 1.1;
}
.total-stack small {
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}
.discount-row span:last-child { color: var(--green); }

.promo {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  margin-bottom: 8px;
}
.promo input {
  background: #0a0e0c;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 11px 12px;
  outline: none;
}
.promo button {
  background: #1a221e;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 0 14px;
  cursor: pointer;
  font-weight: 600;
}
.promo button:hover { border-color: #3d8f57; }
.promo-msg {
  min-height: 18px;
  margin: 0 0 14px;
  font-size: 12px;
  color: var(--muted);
}
.promo-msg.ok { color: var(--green); }
.promo-msg.bad { color: var(--danger); }

.confirm-btn {
  width: 100%;
  border: 0;
  border-radius: 12px;
  background: var(--green);
  color: #041208;
  font-weight: 800;
  font-size: 16px;
  padding: 15px 16px;
  cursor: pointer;
  box-shadow: 0 0 24px rgba(57, 226, 106, 0.25);
}
.confirm-btn:hover { background: var(--green-2); }
.confirm-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.trust {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: #a7b3ab;
  font-size: 12px;
  line-height: 1.35;
}
.form-error {
  color: var(--danger);
  font-size: 13px;
  min-height: 18px;
  margin: 10px 0 0;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  display: grid;
  place-items: center;
  z-index: 100;
  padding: 20px;
}
.success-card {
  width: min(420px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 32px 24px;
  text-align: center;
}
.success-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: var(--green-dim);
  color: var(--green);
  display: grid;
  place-items: center;
  font-size: 28px;
  font-weight: 700;
}
.success-card h2 { margin: 0 0 8px; }
.success-card p { color: var(--muted); margin: 0 0 10px; }
.success-card .btn-green { margin-top: 12px; }

@media (max-width: 920px) {
  .layout { grid-template-columns: 1fr; }
  .summary-card { position: static; }
  .upsell-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step .label { display: none; }
  .form-grid .span-grow,
  .form-grid .span-narrow { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .cart-item {
    grid-template-columns: 72px 1fr;
  }
  .item-side {
    grid-column: 1 / -1;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
  .upsell-list { grid-template-columns: 1fr 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .checkout { width: min(100% - 20px, 1120px); }
  .topbar {
    padding: 14px 16px;
    flex-wrap: wrap;
    gap: 10px;
  }
  .menu-toggle { display: inline-flex; }
  .top-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 6px;
  }
  .topbar.nav-open .top-nav { display: flex; }
  .top-nav a {
    padding: 12px 4px;
    border-top: 1px solid var(--border-soft);
    color: #e8efea;
    font-size: 15px;
  }
}