/* 
  StackVault Website Stylesheet
  Clean, modern, uncluttered design system.
*/

:root {
  --bg-color: #0b0c10;
  --header-bg: rgba(11, 12, 16, 0.9);
  --card-bg: #13151d;
  --card-hover: #181b26;
  --modal-bg: #141720;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.18);
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --secondary-bg: rgba(255, 255, 255, 0.06);
  --secondary-hover: rgba(255, 255, 255, 0.12);
  
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;

  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --max-width: 1140px;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

/* Header Topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 99;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  height: 68px;
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-mark {
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.1rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-name {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--text-main);
}

.telegram-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  transition: background 0.15s ease, transform 0.15s ease;
}

.telegram-link:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.telegram-link svg {
  width: 16px;
  height: 16px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  cursor: pointer;
}

.mobile-toggle svg {
  width: 24px;
  height: 24px;
}

/* Hero Section */
.hero {
  padding: 64px 0 48px;
  text-align: center;
}

.hero-content {
  max-width: 760px;
  margin: 0 auto;
}

.eyebrow {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 12px;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.18;
  margin-bottom: 16px;
  color: var(--text-main);
}

.subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

.btn.primary {
  background: var(--primary);
  color: #ffffff;
}

.btn.primary:hover {
  background: var(--primary-hover);
}

.btn.secondary {
  background: var(--secondary-bg);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn.secondary:hover {
  background: var(--secondary-hover);
  border-color: var(--border-hover);
}

.trust-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.trust-item svg {
  width: 15px;
  height: 15px;
  stroke: var(--accent-green);
}

/* Catalog Section */
.catalog-section {
  padding: 48px 0 64px;
}

.catalog-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.catalog-title-group h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.catalog-title-group p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Search Wrap */
.search-wrap {
  position: relative;
  width: 100%;
  max-width: 300px;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  stroke: var(--text-muted);
  pointer-events: none;
}

.search-wrap input {
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 9px 36px 9px 36px;
  color: var(--text-main);
  font-size: 0.88rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.search-wrap input:focus {
  border-color: var(--primary);
}

.search-clear {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
}

/* Categories Bar */
.categories-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
  margin-bottom: 28px;
}

.cat-btn {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 7px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.cat-btn:hover {
  color: var(--text-main);
  background: var(--secondary-hover);
}

.cat-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

/* Products Grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

/* Product Card */
.product-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.product-card:hover {
  border-color: var(--border-hover);
  background: var(--card-hover);
  transform: translateY(-2px);
}

.product-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.category-tag {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.product-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2px;
  margin-bottom: 8px;
}

.product-stock {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  font-weight: 500;
  white-space: nowrap;
}

.product-stock .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.product-stock.in { color: var(--accent-green); }
.product-stock.in .dot { background: var(--accent-green); }

.product-stock.low { color: var(--accent-amber); }
.product-stock.low .dot { background: var(--accent-amber); }

.product-stock.out { color: var(--accent-red); }
.product-stock.out .dot { background: var(--accent-red); }

.product-desc {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 18px;
}

.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

.price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.price .unit {
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--text-dim);
}

.card-btn-group {
  display: flex;
  gap: 8px;
}

.btn-buy-card {
  background: var(--primary);
  color: #ffffff;
  padding: 7px 14px;
  border-radius: var(--radius-md);
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s ease;
}

.btn-buy-card:hover {
  background: var(--primary-hover);
}

.btn-buy-card.disabled {
  background: var(--secondary-bg);
  color: var(--text-dim);
  pointer-events: none;
}

.btn-details {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 7px 12px;
  border-radius: var(--radius-md);
  font-size: 0.84rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-details:hover {
  color: var(--text-main);
  background: var(--secondary-hover);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

/* Help Section */
.help-section {
  padding: 48px 0 64px;
}

.help-box {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.help-text h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.help-text p {
  color: var(--text-muted);
  font-size: 0.92rem;
}



/* Footer */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding: 24px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-link {
  color: var(--text-main);
  text-decoration: none;
  font-weight: 500;
}

.footer-link:hover {
  text-decoration: underline;
}

/* Modal Backdrop */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--modal-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  padding: 28px;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
}

.modal-close:hover {
  color: var(--text-main);
}

/* Responsive */
@media (max-width: 768px) {
  .nav { display: none; }
  .mobile-toggle { display: block; }
  .hero h1 { font-size: 2.1rem; }
  .products-grid { grid-template-columns: 1fr; }
  .catalog-header { flex-direction: column; align-items: stretch; }
  .search-wrap { max-width: 100%; }
}