:root {
  --bg: #0b0f14;
  --card: #121824;
  --muted: #9aa4b2;
  --text: #e8ecf1;
  --brand: #dc2626;
  --accent: #2563eb;
  --success: #22c55e;
}

header {
  position: sticky;
  top: 0;
  background: rgba(11, 15, 20, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #1b2233;
  z-index: 1000;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 70px;
}
.brand a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  transition: opacity 0.2s;
}

.brand a:hover {
  opacity: 0.9;
}

.brand img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--accent);
  background: rgba(37, 99, 235, 0.1);
}

.nav-link.active {
  color: var(--accent);
  background: rgba(37, 99, 235, 0.15);
  font-weight: 600;
}

.nav-link.cart-link {
  color: var(--success);
  font-weight: 600;
}

.nav-icon {
  width: 16px;
  height: 16px;
}

.user-slot {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.03);
}

.user-slot span {
  color: var(--accent);
  font-weight: 500;
  font-size: 14px;
}

.logout-btn {
  color: var(--brand);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  padding: 3px 8px;
  border: 1px solid var(--brand);
  border-radius: 6px;
  transition: all 0.2s;
}

.logout-btn:hover {
  background: var(--brand);
  color: white;
}
.hamburger-menu {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.hamburger-menu span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--text);
  border-radius: 3px;
  transition: all 0.3s ease;
  transform-origin: center;
}
.hamburger-menu.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.hamburger-menu.active span:nth-child(2) {
  opacity: 0;
  transform: scale(0);
}

.hamburger-menu.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}
.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  width: 320px;
  height: 100vh;
  background: var(--card);
  border-left: 1px solid #1b2233;
  z-index: 1001;
  transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55);
  overflow-y: auto;
  overflow-x: hidden;
  box-shadow: -5px 0 30px rgba(0, 0, 0, 0.3);
  transform: translateX(100%);
  display: none;
}

.mobile-nav.active {
  transform: translateX(0);
  display: block;
}

.mobile-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px;
  border-bottom: 1px solid #1b2233;
  background: rgba(11, 15, 20, 0.9);
  position: sticky;
  top: 0;
  z-index: 1;
}

.mobile-nav-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
}

.mobile-close-btn {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  transition: all 0.2s;
}

.mobile-close-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.1);
}

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

.mobile-nav-links {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: calc(100vh - 80px);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  color: var(--text);
  text-decoration: none;
  border-radius: 10px;
  transition: all 0.2s;
  font-size: 15px;
  font-weight: 500;
}

.mobile-nav-link:hover {
  background: rgba(255, 255, 255, 0.05);
}

.mobile-nav-link.active {
  color: var(--accent);
  background: rgba(37, 99, 235, 0.15);
  font-weight: 600;
}

.mobile-nav-icon {
  width: 18px;
  height: 18px;
  color: var(--muted);
}

.mobile-nav-link.active .mobile-nav-icon {
  color: var(--accent);
}

.mobile-nav-link.cart-link {
  color: var(--success);
}

.mobile-user-info {
  margin-top: 20px;
  padding: 20px;
  background: rgba(11, 15, 20, 0.5);
  border-radius: 10px;
  border: 1px solid #1b2233;
}

.user-greeting {
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 12px;
  font-size: 14px;
}

.logout-link {
  background: rgba(220, 38, 38, 0.1);
  border: 1px solid var(--brand);
}
.mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(3px);
  z-index: 1000;
}

.mobile-overlay.active {
  display: block;
}
body.mobile-menu-open {
  overflow: hidden;
}
.add-btn {
  background: var(--brand);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  font-size: 13px;
  transition: .2s;
  min-height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.add-btn:hover { 
  background: #b91c1c; 
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  .desktop-nav {
    display: none;
  }
  
  .hamburger-menu {
    display: flex;
  }
  
  .brand a {
    font-size: 1.1rem;
  }
  
  .brand img {
    width: 35px;
    height: 35px;
  }
  
  .nav {
    min-height: 60px;
  }
  .grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 12px !important;
  }
  .card {
    margin-bottom: 0;
    height: 100%;
  }
  
  .img-box {
    height: 140px !important;
    margin: 8px !important;
    padding: 10px !important;
  }
  
  .details {
    padding: 12px !important;
  }
  
  .details h3 {
    font-size: 14px !important;
    margin: 0 0 6px 0 !important;
    line-height: 1.3;
  }
  
  .details p {
    font-size: 12px !important;
    margin: 0 0 10px 0 !important;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  
  .badge {
    font-size: 9px !important;
    padding: 3px 6px !important;
    margin-bottom: 8px !important;
  }
  
  .price {
    font-size: 16px !important;
    font-weight: 700;
  }
  
  .price-row {
    margin-top: 8px !important;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .add-btn {
    padding: 12px 16px !important;
    font-size: 14px !important;
    border-radius: 8px !important;
    font-weight: 700;
    min-height: 44px;
    width: 100%;
    margin-top: 4px;
  }
  
  .product-info .add-btn {
    padding: 16px 24px !important;
    font-size: 16px !important;
    min-height: 50px;
    font-weight: 700;
  }
  
  button[type="submit"], 
  .checkout-wrapper .add-btn,
  .form-card button,
  .summary-card button {
    padding: 16px !important;
    font-size: 16px !important;
    min-height: 50px;
    font-weight: 700;
  }
  .about-hero {
    grid-template-columns: 1fr !important;
    padding: 20px 0 !important;
    gap: 20px !important;
  }
  
  .mission-grid {
    grid-template-columns: 1fr !important;
    gap: 12px !important;
    margin-top: 16px !important;
  }
  
  .mission-box {
    padding: 15px !important;
  }
  
  .mission-box h4 {
    font-size: 14px !important;
    margin-bottom: 8px !important;
  }
  
  .mission-box p {
    font-size: 12px !important;
  }
  
  .about-card {
    padding: 20px !important;
  }
  
  .warning-banner {
    padding: 16px !important;
    margin-top: 20px !important;
  }
  .product {
    grid-template-columns: 1fr !important;
    gap: 20px !important;
    margin-top: 20px !important;
  }
  
  .product-img {
    padding: 15px !important;
    border-radius: 12px !important;
  }
  
  .product-info h1 {
    font-size: 24px !important;
  }
  
  .product-info .price {
    font-size: 22px !important;
  }
  
  .product-info .desc {
    font-size: 14px !important;
  }
  
  .product-info .add-btn {
    margin-top: 20px;
    width: 100%;
  }
  .checkout-wrapper {
    grid-template-columns: 1fr !important;
    gap: 20px !important;
    padding: 15px !important;
  }
  
  .summary-card,
  .form-card {
    padding: 20px !important;
  }
  
  .item-list li {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 6px !important;
    padding: 12px 0 !important;
  }
  
  .qty-tag {
    margin-left: 0 !important;
    margin-top: 4px !important;
  }
  input, textarea {
    padding: 14px !important;
    font-size: 16px !important;
    min-height: 48px;
  }
  
  button[type="submit"] {
    padding: 16px !important;
    font-size: 16px !important;
    min-height: 56px;
  }
  .form-content {
    padding: 20px !important;
  }
  
  .auth-side-panel img {
    width: 80px !important;
  }
  
  .btn {
    padding: 16px !important;
    font-size: 16px !important;
    min-height: 56px;
  }
  h1 {
    font-size: 24px !important;
    margin-bottom: 8px !important;
  }
  
  h2 {
    font-size: 20px !important;
  }
  
  h3 {
    font-size: 18px !important;
  }
  
  .subtitle {
    font-size: 14px !important;
    margin-bottom: 25px !important;
  }
  footer {
    padding: 25px 0 !important;
    margin-top: 30px !important;
  }
  
  footer p {
    font-size: 11px !important;
  }
}

@media (max-width: 480px) {
  .mobile-nav {
    width: 100%;
  }
  
  .brand a {
    font-size: 1rem;
    gap: 8px;
  }
  
  .brand img {
    width: 30px;
    height: 30px;
  }
  
  .hamburger-menu {
    width: 26px;
    height: 18px;
  }
  
  .hamburger-menu span {
    height: 2.5px;
  }
  
  .mobile-nav-header {
    padding: 20px;
  }
  
  .mobile-nav-links {
    padding: 16px;
  }
  
  .mobile-nav-link {
    padding: 12px 16px;
    font-size: 14px;
    min-height: 48px;
  }
  .grid {
    gap: 10px !important;
  }
  
  .img-box {
    height: 120px !important;
    margin: 6px !important;
    padding: 8px !important;
  }
  
  .details {
    padding: 10px !important;
  }
  
  .details h3 {
    font-size: 13px !important;
  }
  
  .details p {
    font-size: 11px !important;
    -webkit-line-clamp: 2;
  }
  
  .badge {
    font-size: 8px !important;
    padding: 2px 5px !important;
  }
  
  .price {
    font-size: 14px !important;
  }
  
  .add-btn {
    padding: 14px 16px !important;
    font-size: 15px !important;
    min-height: 48px;
  }
  
  .container {
    padding: 0 12px;
  }
}

@media (max-width: 768px) and (orientation: landscape) {
  .nav {
    flex-direction: row;
  }
  
  .mobile-nav {
    height: 100vh;
    overflow-y: auto;
  }
  .grid {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  
  .img-box {
    height: 120px !important;
  }
  
  .add-btn {
    min-height: 44px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .container {
    padding: 0 20px;
    max-width: 95%;
  }
  .nav {
    min-height: 65px;
  }
  .brand a {
    font-size: 1.2rem;
  }
  .brand img {
    width: 38px;
    height: 38px;
  }
  .desktop-nav {
    gap: 15px;
  }
  .nav-link {
    font-size: 13px;
    padding: 6px 12px;
  }
  .grid {
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 20px !important;
  }
  
  .img-box {
    height: 180px !important;
  }
  
  .add-btn {
    padding: 10px 16px !important;
    font-size: 14px !important;
    min-height: 40px;
  }
  .mission-grid {
    grid-template-columns: 1fr !important;
  }
  .about-hero {
    gap: 30px !important;
  }
  .product {
    grid-template-columns: 1fr !important;
    gap: 30px !important;
  }
  .checkout-wrapper {
    grid-template-columns: 1fr !important;
    gap: 30px !important;
    padding: 20px !important;
  }
  h1 {
    font-size: 36px !important;
  }
  h2 {
    font-size: 28px !important;
  }
  .subtitle {
    font-size: 1rem !important;
  }
}

@media (min-width: 1025px) {
  .container {
    max-width: 1100px;
  }
  .grid {
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 24px !important;
  }
  .img-box {
    height: 220px !important;
  }
}

@media (min-width: 1200px) {
  .container {
    max-width: 1200px;
  }
  .grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)) !important;
    gap: 30px !important;
  }
  .img-box {
    height: 240px !important;
  }
}

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .card {
    border: 0.5px solid #1b2233;
  }
}

@media print {
  header, 
  footer, 
  .add-btn, 
  nav, 
  .warning-banner,
  .hamburger-menu,
  .desktop-nav,
  .mobile-nav,
  .mobile-overlay {
    display: none !important;
  }
  body {
    background: white !important;
    color: black !important;
  }
  .container {
    max-width: 100% !important;
    padding: 10px !important;
  }
  .grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 15px !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
  .mobile-nav {
    transition: none;
  }
  .hamburger-menu span {
    transition: none;
  }
}

@media (hover: none) and (pointer: coarse) {
  .add-btn {
    min-height: 44px;
  }
  
  .nav-link,
  .mobile-nav-link {
    min-height: 44px;
  }
  
  input, 
  textarea, 
  select, 
  button {
    font-size: 16px !important;
  }
}

@media (prefers-contrast: high) {
  .add-btn {
    border: 2px solid white;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f14;
    --card: #121824;
    --muted: #9aa4b2;
    --text: #e8ecf1;
  }
}