:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(31, 41, 55, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.35);
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: rgba(99, 102, 241, 0.15);
  --accent: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
  --accent-gradient-orange: linear-gradient(135deg, #f97316 0%, #ec4899 100%);
  
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.25);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Glassmorphism utility */
.glass {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: #374151;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Header & Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(20px);
}

.nav-container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.logo-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: #fff;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
}

.logo-text span {
  background: var(--accent-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-search {
  flex: 1;
  max-width: 460px;
  position: relative;
}

.nav-search input {
  width: 100%;
  padding: 0.65rem 1rem 0.65rem 2.75rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  font-size: 0.9rem;
  transition: var(--transition);
}

.nav-search input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.3);
  background: rgba(255, 255, 255, 0.08);
}

.nav-search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-btn {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.88rem;
  text-decoration: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--primary);
}

.cart-btn {
  position: relative;
  background: var(--accent-gradient);
  color: #fff;
  border: none;
}

.cart-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.cart-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  background: #ef4444;
  color: #fff;
  font-size: 0.72rem;
  font-weight: 800;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--bg-primary);
}

/* Hero Section */
.hero {
  position: relative;
  padding: 3.5rem 1.5rem 2.5rem;
  overflow: hidden;
  background: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, 0.18), transparent 70%);
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 3rem;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: 9999px;
  background: var(--primary-light);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #818cf8;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 1.2rem;
}

.hero h1 {
  font-size: 3.1rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.2rem;
  letter-spacing: -1px;
}

.hero h1 .highlight {
  background: var(--accent-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 1.5rem;
}

.stat-item h4 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
}

.stat-item p {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 0;
}

.hero-banner-card {
  position: relative;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-glow);
  transform: perspective(1000px) rotateY(-5deg) rotateX(4deg);
  transition: transform 0.4s ease;
}

.hero-banner-card:hover {
  transform: perspective(1000px) rotateY(0deg) rotateX(0deg) scale(1.02);
}

.hero-banner-card img {
  max-width: 100%;
  height: 280px;
  object-fit: contain;
  border-radius: var(--radius-md);
  filter: drop-shadow(0 15px 25px rgba(0,0,0,0.6));
}

/* Brands Carousel / Grid */
.brands-section {
  max-width: 1300px;
  margin: 1rem auto 2.5rem;
  padding: 0 1.5rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.brands-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}

.brand-pill {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.2rem 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition);
  cursor: pointer;
  text-align: center;
}

.brand-pill:hover, .brand-pill.active {
  background: var(--bg-card-hover);
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.brand-pill span {
  font-weight: 700;
  font-size: 0.95rem;
  margin-top: 0.3rem;
}

/* Main Store Catalog Layout */
.catalog-container {
  max-width: 1300px;
  margin: 0 auto 4rem;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2rem;
  align-items: start;
}

/* Filters Sidebar */
.filters-sidebar {
  padding: 1.5rem;
  border-radius: var(--radius-md);
  position: sticky;
  top: 5rem;
}

.filter-group {
  margin-bottom: 1.5rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--border-color);
}

.filter-group:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.filter-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.9rem;
  color: #fff;
  display: flex;
  justify-content: space-between;
}

.filter-option {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.filter-option:hover {
  color: #fff;
}

.filter-option input[type="checkbox"],
.filter-option input[type="radio"] {
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.price-slider-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.price-slider-wrap input[type="range"] {
  accent-color: var(--primary);
  width: 100%;
}

.price-values {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-reset-filters {
  width: 100%;
  padding: 0.6rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-reset-filters:hover {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border-color: #ef4444;
}

/* Products Grid */
.catalog-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.catalog-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 1.2rem;
  border-radius: var(--radius-sm);
}

.results-count {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.sort-select {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  cursor: pointer;
}

.sort-select:focus {
  outline: none;
  border-color: var(--primary);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

/* Phone Card */
.phone-card {
  border-radius: var(--radius-md);
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.phone-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}

.card-badges {
  position: absolute;
  top: 1rem;
  left: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  z-index: 2;
}

.badge {
  padding: 0.2rem 0.6rem;
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-5g {
  background: rgba(6, 182, 212, 0.2);
  color: #38bdf8;
  border: 1px solid rgba(6, 182, 212, 0.4);
}

.badge-offer {
  background: rgba(239, 68, 68, 0.2);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.badge-featured {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.phone-img-wrap {
  width: 100%;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  cursor: pointer;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.2);
}

.phone-img-wrap img {
  max-width: 90%;
  max-height: 90%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.phone-card:hover .phone-img-wrap img {
  transform: scale(1.08);
}

.phone-brand-tag {
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.phone-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: #fff;
  line-height: 1.3;
  text-decoration: none;
}

.phone-title:hover {
  color: var(--primary);
}

/* Mini specs pill list */
.specs-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.6rem 0 1rem;
}

.spec-pill {
  background: rgba(255, 255, 255, 0.05);
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: var(--text-muted);
}

.phone-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.8rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.price-wrap {
  display: flex;
  flex-direction: column;
}

.old-price {
  font-size: 0.82rem;
  color: var(--text-dim);
  text-decoration: line-through;
}

.current-price {
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
}

.btn-add-cart {
  background: var(--primary);
  color: #fff;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.btn-add-cart:hover {
  background: var(--primary-hover);
  transform: scale(1.08);
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.5);
}

/* Cart Drawer / Sidebar */
.cart-drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.cart-drawer-overlay.active {
  opacity: 1;
  visibility: visible;
}

.cart-drawer {
  position: fixed;
  top: 0;
  right: -450px;
  width: 100%;
  max-width: 420px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  z-index: 210;
  display: flex;
  flex-direction: column;
  transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
}

.cart-drawer.active {
  right: 0;
}

.cart-header {
  padding: 1.2rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.cart-header h3 {
  font-size: 1.2rem;
  font-weight: 700;
}

.btn-close-cart {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
}

.cart-items-list {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.cart-item {
  display: flex;
  gap: 1rem;
  padding: 0.9rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  align-items: center;
}

.cart-item img {
  width: 60px;
  height: 60px;
  object-fit: cover;
  border-radius: 6px;
}

.cart-item-info {
  flex: 1;
}

.cart-item-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.2rem;
}

.cart-item-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.cart-item-price {
  font-weight: 700;
  color: var(--accent);
  margin-top: 0.2rem;
  font-size: 0.95rem;
}

.cart-qty-ctrl {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.cart-qty-btn {
  width: 26px;
  height: 26px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #fff;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.cart-footer {
  padding: 1.5rem;
  border-top: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.2);
}

.cart-summary-line {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.cart-summary-line.total {
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px dashed var(--border-color);
}

.btn-checkout {
  width: 100%;
  padding: 0.9rem;
  background: var(--accent-gradient);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.btn-checkout:hover {
  opacity: 0.95;
  box-shadow: var(--shadow-glow);
}

/* Modal UI */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-md);
}

.modal-close {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Toast Notifications */
#toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 400;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  padding: 0.9rem 1.2rem;
  border-radius: var(--radius-sm);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: var(--shadow-md);
  animation: slideInRight 0.3s ease;
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Responsive */
@media (max-width: 900px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero p {
    margin: 0 auto 2rem;
  }
  .hero-stats {
    justify-content: center;
  }
  .catalog-container {
    grid-template-columns: 1fr;
  }
  .filters-sidebar {
    position: static;
  }
}

/* Auth Tabs & User Menu */
.auth-tab {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}
.auth-tab.active {
  background: var(--accent-gradient);
  color: #fff;
}
.auth-tab:not(.active):hover {
  color: #fff;
}

.nav-user-menu {
  position: relative;
}
.nav-user-menu .nav-btn {
  white-space: nowrap;
}
.user-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 220px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 12px 32px rgba(0,0,0,0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all 0.2s ease;
  z-index: 100;
  overflow: hidden;
}
.user-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.user-dropdown-header {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0.3rem;
}
.user-dropdown a {
  display: block;
  padding: 0.6rem 1rem;
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.9rem;
  transition: background 0.15s ease;
}
.user-dropdown a:hover {
  background: rgba(255,255,255,0.05);
  color: #fff;
}

/* Product Detail Page */
.spec-detail-box {
  background: rgba(255,255,255,0.04);
  padding: 0.8rem 1rem;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.05);
}
.spec-detail-box small {
  display: block;
  color: var(--text-dim);
  font-size: 0.78rem;
  margin-bottom: 0.2rem;
  text-transform: uppercase;
}
.spec-detail-box strong {
  color: #fff;
  font-size: 0.92rem;
}