:root {
  --ink: #16203A;
  --ink-light: #4A5578;
  --paper: #FFFFFF;
  --bg: #F5F6FA;
  --line: #E3E6F0;
  --accent: #2F5EFF;
  --accent-dark: #1E43CC;
  --gold: #E8A33D;
  --sold: #E15C5C;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
}

a { color: inherit; text-decoration: none; }

/* Header */
.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 20px;
}
.logo { font-size: 20px; font-weight: 800; color: var(--accent); }
.search-form { display: flex; flex: 1; max-width: 420px; }
.search-form input {
  flex: 1;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius) 0 0 var(--radius);
  outline: none;
}
.search-form button {
  padding: 9px 16px;
  border: none;
  background: var(--ink);
  color: #fff;
  border-radius: 0 var(--radius) var(--radius) 0;
  cursor: pointer;
}
.main-nav { display: flex; align-items: center; gap: 14px; font-size: 14px; white-space: nowrap; }
.nav-user { color: var(--ink-light); }

.category-bar {
  display: flex;
  gap: 18px;
  padding: 10px 20px;
  font-size: 14px;
  overflow-x: auto;
}
.category-bar a { color: var(--ink-light); padding: 4px 0; border-bottom: 2px solid transparent; }
.category-bar a.active, .category-bar a:hover { color: var(--accent); border-color: var(--accent); }

/* Buttons */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
}
.btn-primary:hover { background: var(--accent-dark); }
.btn-primary:disabled { background: #B7BDD4; cursor: not-allowed; }
.btn-outline {
  display: inline-block;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 9px 18px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14px;
}
.btn-small { padding: 6px 14px; font-size: 13px; }

/* Hero */
.hero { padding: 48px 0 28px; max-width: 640px; }
.hero h1 { font-size: 32px; line-height: 1.25; margin: 0 0 10px; }
.hero p { color: var(--ink-light); font-size: 15px; }

/* Product grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  padding: 10px 0 60px;
}
.product-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow .15s, transform .15s;
}
.product-card:hover { box-shadow: 0 8px 24px rgba(22,32,58,0.08); transform: translateY(-2px); }
.thumb { position: relative; aspect-ratio: 16/10; background: #EDEFF6; overflow: hidden; }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.badge {
  position: absolute; top: 10px; right: 10px;
  font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: 999px;
  color: #fff; text-transform: uppercase;
}
.badge-sold { background: var(--sold); }
.product-info { padding: 14px 16px 16px; }
.category-tag {
  font-size: 11px; text-transform: uppercase; letter-spacing: .04em;
  color: var(--accent); font-weight: 700;
}
.product-info h3 { margin: 6px 0 4px; font-size: 16px; }
.tech-stack { font-size: 12.5px; color: var(--ink-light); margin: 0 0 12px; }
.price-row { display: flex; justify-content: space-between; align-items: center; }
.price { font-weight: 800; color: var(--gold); }
.view-link { font-size: 13px; color: var(--ink-light); }
.empty-state { color: var(--ink-light); padding: 40px 0; }

/* Product detail */
.product-detail { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; padding: 40px 0 70px; }
.product-media img { width: 100%; border-radius: var(--radius); border: 1px solid var(--line); margin-bottom: 14px; }
.product-main h1 { font-size: 28px; margin: 8px 0 6px; }
.description { color: var(--ink-light); line-height: 1.7; margin: 18px 0; }
.buy-box {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; display: flex; align-items: center; justify-content: space-between;
  background: var(--paper);
}
.price-large { font-size: 24px; font-weight: 800; color: var(--gold); }

@media (max-width: 800px) {
  .product-detail { grid-template-columns: 1fr; }
}

/* Auth */
.auth-box, .checkout-box, .purchases {
  max-width: 420px; margin: 50px auto; background: var(--paper);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 30px;
}
.auth-box h1, .checkout-box h1, .purchases h1 { font-size: 22px; margin-top: 0; }
.auth-box form { display: flex; flex-direction: column; gap: 14px; }
.auth-box label { font-size: 13px; color: var(--ink-light); display: flex; flex-direction: column; gap: 6px; }
.auth-box input {
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px; color: var(--ink);
}
.auth-box p { font-size: 13px; margin-top: 16px; color: var(--ink-light); }
.error { color: var(--sold); font-size: 13px; }

/* Checkout */
.summary-row { display: flex; justify-content: space-between; padding: 8px 0; font-size: 14px; color: var(--ink-light); }
.summary-row.total { border-top: 1px dashed var(--line); margin-top: 6px; padding-top: 12px; font-weight: 700; color: var(--ink); }
.checkout-box form { margin: 18px 0 10px; }
.checkout-box .btn-primary { width: 100%; }
.note { font-size: 12px; color: var(--ink-light); line-height: 1.5; }

/* Purchases */
.purchase-list { list-style: none; padding: 0; margin: 16px 0 0; display: flex; flex-direction: column; gap: 10px; }
.purchase-list li { display: flex; justify-content: space-between; align-items: center; font-size: 14px; }

/* Admin */
.admin-body { background: var(--bg); }
.admin-header { display: flex; justify-content: space-between; align-items: center; padding-top: 30px; }
.sales-total { color: var(--ink-light); margin-bottom: 20px; }
.admin-table { width: 100%; border-collapse: collapse; background: var(--paper); border-radius: var(--radius); overflow: hidden; margin-bottom: 60px; }
.admin-table th, .admin-table td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); font-size: 14px; }
.admin-table th { background: #EEF0F8; font-size: 12px; text-transform: uppercase; color: var(--ink-light); }
.admin-form {
  display: flex; flex-direction: column; gap: 14px; max-width: 520px;
  background: var(--paper); padding: 24px; border-radius: var(--radius); border: 1px solid var(--line); margin-bottom: 60px;
}
.admin-form label { font-size: 13px; color: var(--ink-light); display: flex; flex-direction: column; gap: 6px; }
.admin-form input, .admin-form select, .admin-form textarea {
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px; font-family: inherit; color: var(--ink);
}

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 24px 0; margin-top: 20px; }
.site-footer p { color: var(--ink-light); font-size: 13px; margin: 0; }