/* ============================================================
   NOVA — Premium Tech E-commerce
   Design System & Styles
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors */
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-accent: #0071e3;
  --color-accent-hover: #0077ED;
  --color-border: rgba(0, 0, 0, 0.08);
  --color-card-bg: #f5f5f7;
  --color-dark: #1d1d1f;
  --color-dark-surface: #161617;
  --color-dark-text: #f5f5f7;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --font-size-sm: clamp(0.8rem, 0.75rem + 0.3vw, 0.9rem);
  --font-size-base: clamp(0.9rem, 0.85rem + 0.3vw, 1rem);
  --font-size-md: clamp(1rem, 0.9rem + 0.5vw, 1.2rem);
  --font-size-lg: clamp(1.25rem, 1rem + 1vw, 1.75rem);
  --font-size-xl: clamp(1.75rem, 1.25rem + 2vw, 3rem);
  --font-size-hero: clamp(2.5rem, 2rem + 4vw, 5.5rem);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 6rem;
  --space-2xl: 10rem;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 52px;

  /* Transitions */
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.2s var(--ease-smooth);
  --transition-medium: 0.4s var(--ease-out);
  --transition-slow: 0.6s var(--ease-out);

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 980px;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul {
  list-style: none;
}

/* ---------- Utility ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: rgba(250, 250, 250, 0.72);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: var(--nav-height);
}

.nav-logo {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
  transition: opacity var(--transition-fast);
}

.nav-logo:hover {
  opacity: 0.7;
}

.nav-menu {
  display: flex;
  gap: var(--space-lg);
}

.nav-menu a {
  font-size: var(--font-size-xs);
  font-weight: 400;
  color: var(--color-text);
  opacity: 0.8;
  transition: opacity var(--transition-fast);
  letter-spacing: 0.01em;
}

.nav-menu a:hover {
  opacity: 1;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Cart toggle */
.cart-toggle {
  position: relative;
  color: var(--color-text);
  padding: 4px;
  transition: opacity var(--transition-fast);
}

.cart-toggle:hover {
  opacity: 0.7;
}

.cart-count {
  position: absolute;
  top: -4px;
  right: -8px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.6rem;
  font-weight: 600;
  min-width: 16px;
  height: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.cart-count.show {
  opacity: 1;
  transform: scale(1);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 100vh;
  padding: calc(var(--nav-height) + var(--space-lg)) var(--space-md) var(--space-lg);
  gap: var(--space-lg);
  overflow: hidden;
}

.hero-content {
  max-width: 680px;
}

.hero-eyebrow {
  font-size: var(--font-size-md);
  font-weight: 400;
  color: var(--color-accent);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-xs);
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.hero-subtitle {
  font-size: var(--font-size-md);
  font-weight: 300;
  color: var(--color-text-secondary);
  line-height: 1.5;
  max-width: 460px;
  margin: 0 auto var(--space-md);
}

.hero-cta {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-image {
  position: relative;
  width: 100%;
  max-width: 560px;
}

.hero-image img {
  width: 100%;
  transition: transform 1.2s var(--ease-out);
}

.hero-image:hover img {
  transform: scale(1.04) rotate(1deg);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-pill);
  padding: 0.75em 2em;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: scale(1.04);
  box-shadow: 0 4px 24px rgba(0, 113, 227, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}

.btn-secondary:hover {
  background: var(--color-accent);
  color: #fff;
  transform: scale(1.04);
}

.btn-add {
  background: var(--color-dark);
  color: #fff;
  font-size: var(--font-size-xs);
  padding: 0.6em 1.6em;
}

.btn-add:hover {
  background: #000;
  transform: scale(1.04);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
}

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.section-eyebrow {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-xs);
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--color-text);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

/* ============================================================
   PRODUCTS
   ============================================================ */
.products-section {
  padding: var(--space-xl) var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Filter bar */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.filter-btn {
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 0.55em 1.5em;
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--color-border);
  background: transparent;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--color-text);
  border-color: var(--color-text);
}

.filter-btn.active {
  background: var(--color-dark);
  color: #fff;
  border-color: var(--color-dark);
}

/* Product grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
}

.product-card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

.product-card.hidden {
  display: none;
}

.product-card-image {
  overflow: hidden;
  padding: var(--space-lg) var(--space-md) var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-card-bg);
}

.product-card-image img {
  width: 75%;
  transition: transform 0.6s var(--ease-out);
}

.product-card:hover .product-card-image img {
  transform: scale(1.08);
}

.product-card-info {
  padding: var(--space-sm) var(--space-md) var(--space-md);
}

.product-card-info h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: 0.25em;
  letter-spacing: -0.01em;
}

.product-price {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

/* ============================================================
   FEATURES / IMMERSIVE
   ============================================================ */
.features-section {
  padding: var(--space-xl) var(--space-md) var(--space-2xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
  margin-bottom: var(--space-xl);
}

.feature-row-reverse {
  direction: rtl;
}

.feature-row-reverse > * {
  direction: ltr;
}

.feature-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.feature-image img {
  width: 100%;
  transition: transform 1s var(--ease-out);
}

.feature-image:hover img {
  transform: scale(1.06);
}

.feature-text h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.feature-text p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 440px;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-section {
  background: var(--color-dark);
  color: var(--color-dark-text);
  padding: var(--space-2xl) var(--space-md);
  text-align: center;
}

.about-inner {
  max-width: 720px;
  margin: 0 auto;
}

.about-section .section-eyebrow {
  color: rgba(255, 255, 255, 0.5);
}

.about-statement {
  font-size: var(--font-size-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: var(--space-md);
}

.about-body {
  font-size: var(--font-size-md);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-dark-surface);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-xl) var(--space-md) var(--space-md);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.03em;
}

.footer-brand p {
  font-size: var(--font-size-xs);
  margin-top: var(--space-xs);
  color: rgba(255, 255, 255, 0.4);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.footer-col h4 {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-sm);
}

.footer-col a {
  display: block;
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.5);
  padding: 0.3em 0;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: var(--space-md);
  text-align: center;
}

.footer-bottom p {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.3);
}

/* ============================================================
   CART DRAWER
   ============================================================ */
.cart-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-medium), visibility var(--transition-medium);
}

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

.cart-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 420px;
  height: 100%;
  background: var(--color-surface);
  z-index: 2001;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.5s var(--ease-out);
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.08);
}

.cart-drawer.open {
  transform: translateX(0);
}

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

.cart-header h2 {
  font-size: var(--font-size-md);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.cart-close {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.cart-items {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-sm) var(--space-md);
}

.cart-items::-webkit-scrollbar {
  width: 4px;
}

.cart-items::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

/* Cart item */
.cart-item {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: var(--space-sm);
  align-items: center;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  animation: cartItemIn 0.35s var(--ease-out);
}

@keyframes cartItemIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

.cart-item-image {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-sm);
  background: var(--color-card-bg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
}

.cart-item-image img {
  width: 100%;
}

.cart-item-details h4 {
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: 0.15em;
}

.cart-item-details .cart-item-price {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.cart-item-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.qty-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

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

.cart-item-qty {
  font-size: var(--font-size-sm);
  font-weight: 500;
  min-width: 20px;
  text-align: center;
}

/* Cart footer */
.cart-footer {
  padding: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.cart-total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.cart-total span:first-child {
  font-size: var(--font-size-base);
  font-weight: 500;
}

#cart-total-price {
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.btn-checkout {
  width: 100%;
  padding: 1em;
  font-size: var(--font-size-base);
}

.btn-checkout:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* Empty cart */
.cart-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  color: var(--color-text-secondary);
  gap: var(--space-sm);
}

.cart-empty-icon {
  font-size: 3rem;
  opacity: 0.3;
}

.cart-empty p {
  font-size: var(--font-size-sm);
}

/* ============================================================
   TOAST
   ============================================================ */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-dark);
  color: #fff;
  padding: 0.8em 1.6em;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-sm);
  font-weight: 500;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  z-index: 3000;
  opacity: 0;
  transition: transform 0.4s var(--ease-out), opacity 0.4s var(--ease-out);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Tablet and up */
@media (min-width: 768px) {
  .hero {
    flex-direction: row;
    text-align: left;
    padding: 0 var(--space-lg);
    gap: var(--space-xl);
  }

  .hero-content {
    flex: 1;
  }

  .hero-cta {
    justify-content: flex-start;
  }

  .hero-image {
    flex: 1;
  }

  .hero-subtitle {
    margin-left: 0;
  }
}

/* Mobile */
@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(250, 250, 250, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-medium), visibility var(--transition-medium);
    z-index: 999;
  }

  .nav-menu.open {
    opacity: 1;
    visibility: visible;
  }

  .nav-menu a {
    font-size: var(--font-size-lg);
    font-weight: 500;
  }

  .hero-image {
    max-width: 340px;
  }

  .feature-row,
  .feature-row-reverse {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .feature-row-reverse {
    direction: ltr;
  }

  .feature-text p {
    max-width: none;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .footer-links {
    grid-template-columns: repeat(3, 1fr);
  }

  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--space-sm);
  }

  .product-card-image {
    padding: var(--space-md) var(--space-sm) var(--space-xs);
  }

  .product-card-info {
    padding: var(--space-xs) var(--space-sm) var(--space-sm);
  }
}

/* Small mobile */
@media (max-width: 380px) {
  .footer-links {
    grid-template-columns: 1fr 1fr;
  }

  .filter-bar {
    gap: 6px;
  }

  .filter-btn {
    padding: 0.45em 1em;
  }
}

/* Large screens */
@media (min-width: 1200px) {
  .hero-image {
    max-width: 620px;
  }
}

/* ============================================================
   PRODUCT DETAILS PAGE
   ============================================================ */
.pdp-section {
  padding: calc(var(--nav-height) + var(--space-xl)) var(--space-md) var(--space-2xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.back-link {
  display: inline-block;
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.pdp-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.pdp-gallery {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.pdp-main-image {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.pdp-main-image img {
  width: 100%;
  max-width: 500px;
}

.pdp-thumbnails {
  display: flex;
  gap: var(--space-sm);
}

.pdp-thumbnails .thumb {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--color-card-bg);
  cursor: pointer;
  transition: opacity var(--transition-fast);
  padding: 8px;
}

.pdp-thumbnails .thumb:hover {
  opacity: 0.7;
}

.pdp-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.pdp-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.pdp-price {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

.pdp-description {
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.btn-large {
  padding: 1em 2.5em;
  font-size: var(--font-size-md);
  margin-top: var(--space-md);
  width: fit-content;
}

/* ============================================================
   CHECKOUT PAGE
   ============================================================ */
.checkout-section {
  padding: calc(var(--nav-height) + var(--space-lg)) var(--space-md) var(--space-2xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.checkout-container {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--space-xl);
}

.checkout-form-area h3 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

.form-group {
  margin-bottom: var(--space-sm);
}

.form-group input {
  width: 100%;
  padding: 1em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: var(--font-size-base);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-group input:focus {
  border-color: var(--color-accent);
}

.form-row {
  display: flex;
  gap: var(--space-sm);
}

.form-row .form-group {
  flex: 1;
}

.payment-methods {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 1em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.radio-label:hover {
  background: var(--color-card-bg);
}

.checkout-summary-area {
  background: var(--color-card-bg);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  height: fit-content;
}

.checkout-summary-area h3 {
  font-size: var(--font-size-md);
  margin-bottom: var(--space-md);
}

.checkout-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.checkout-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.checkout-total {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-lg);
  font-weight: 700;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

@media (max-width: 767px) {
  .pdp-container, .checkout-container {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}