/* ===== DESIGN TOKENS ===== */
:root {
  /* Primary - Trust Blue */
  --color-primary: #1a6dcc;
  --color-primary-dark: #0f4f99;
  --color-primary-light: #e8f1fb;

  /* Accent - Action Orange */
  --color-accent: #ff6a2b;
  --color-accent-dark: #e55a1f;

  /* Success */
  --color-success: #00b37a;

  /* Neutrals */
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-border: #e8eaed;

  /* Text */
  --color-text-primary: #1a1a2e;
  --color-text-secondary: #5f6368;
  --color-text-tertiary: #9aa0a6;
  --color-text-inverse: #ffffff;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-card: 0 1px 4px rgba(0,0,0,0.06);
  --shadow-card-hover: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-pill: 50px;
  --radius-card: 12px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Layout */
  --header-height: 56px;
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-size: 0.875rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== HEADER ===== */
header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: var(--color-surface);
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  z-index: 800;
}

.menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.menu-btn:hover,
.menu-btn:active {
  background: var(--color-primary-light);
}

.menu-btn__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
}

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

.site-logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  display: block;
}

.site-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

/* ===== SIDEBAR MENU ===== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  height: 100%;
  background: var(--color-surface);
  padding: 0;
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
  z-index: 1000;
  box-shadow: var(--shadow-lg);
  overflow-y: auto;
}

nav.active {
  transform: translateX(0);
}

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

.menu-header h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.menu-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.menu-close:hover {
  background: var(--color-bg);
}

nav ul {
  list-style: none;
  padding: var(--space-sm) 0;
}

nav ul li a {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: var(--space-md) var(--space-xl);
  transition: background var(--transition-fast), color var(--transition-fast);
  border-left: 3px solid transparent;
}

nav ul li a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

nav ul li a.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: 600;
}

.menu-icon {
  font-size: 1.25rem;
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

/* ===== OVERLAY ===== */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
  z-index: 900;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

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

/* ===== INSTALL BANNER ===== */
.install-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.8125rem;
  font-weight: 500;
  text-align: center;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--color-border);
}

.install-banner button {
  border: none;
  cursor: pointer;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  padding: var(--space-sm) var(--space-lg);
  transition: all var(--transition-fast);
}

#install-btn {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

#install-btn:hover {
  background: var(--color-primary-dark);
}

/* ===== CONTENT WRAPPER ===== */
.content-wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ===== TAGLINE (Category Title) ===== */
.tagline {
  padding: var(--space-xl) 0 var(--space-md);
  color: var(--color-text-primary);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: var(--space-md);
  display: inline-block;
}

.tagline__emoji {
  font-size: 1.25rem;
  vertical-align: middle;
}

/* ===== PRICE DISCLAIMER ===== */
.price-disclaimer {
  font-size: 0.6875rem;
  color: #ff0000;
  line-height: 1.5;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-border);
  margin-bottom: var(--space-sm);
}

/* ===== PRODUCT GRID ===== */
.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  padding: var(--space-lg);
}

/* ===== PRODUCT CARD ===== */
.card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border-radius: var(--radius-card);
  text-decoration: none;
  color: var(--color-text-primary);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.card:active {
  transform: scale(0.98);
  box-shadow: var(--shadow-sm);
}

.card-image {
  position: relative;
  width: 100%;
  padding-top: 100%;
  overflow: hidden;
  background: var(--color-bg);
}

.card-image img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card:hover .card-image img {
  transform: scale(1.04);
}

.card-info {
  display: flex;
  flex-direction: column;
  padding: var(--space-md);
  gap: var(--space-sm);
  flex: 1;
}

.card-name {
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--color-text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  min-height: calc(0.8125rem * 1.3 * 2);
}

.card-price {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  letter-spacing: -0.01em;
}

.card-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent);
  color: var(--color-text-inverse);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: background var(--transition-fast);
  margin-top: auto;
}

.card:hover .card-cta {
  background: var(--color-accent-dark);
}

/* ===== SKELETON LOADING ===== */
@keyframes skeleton-pulse {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton-card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.skeleton-image {
  width: 100%;
  padding-top: 100%;
  background: linear-gradient(90deg, #eee 25%, #f5f5f5 50%, #eee 75%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

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

.skeleton-line {
  height: 12px;
  border-radius: 4px;
  background: linear-gradient(90deg, #eee 25%, #f5f5f5 50%, #eee 75%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

.skeleton-line--short { width: 60%; }
.skeleton-line--price { height: 16px; width: 45%; }
.skeleton-line--cta { height: 32px; width: 100%; border-radius: var(--radius-sm); }

/* ===== SCROLL TO TOP ===== */
.scroll-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition-normal), visibility var(--transition-normal), transform var(--transition-normal), background var(--transition-fast);
  z-index: 700;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  background: var(--color-primary-dark);
}

.scroll-top:active {
  transform: scale(0.92);
}

/* ===== FOOTER ===== */
.site-footer {
  margin-top: var(--space-2xl);
  padding: var(--space-xl) var(--space-lg);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.footer-brand {
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--color-text-primary);
}

.footer-divider {
  color: var(--color-text-tertiary);
}

.footer-text {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 420px) {
  .site-logo { width: 28px; height: 28px; }
  .site-title { font-size: 1rem; }
}

@media (min-width: 600px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    padding: var(--space-xl);
  }
}

@media (min-width: 960px) {
  .grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-2xl);
  }

  .content-wrapper {
    padding: 0 var(--space-2xl);
  }

  .site-title { font-size: 1.25rem; }
  .card-name { font-size: 0.875rem; }
  .card-price { font-size: 1.0625rem; }
}

@media (min-width: 1280px) {
  .grid {
    grid-template-columns: repeat(5, 1fr);
  }
}