:root {
  /* Color Palette */
  --color-primary: #8CBA26;
  --color-primary-dark: #6e941e;
  --color-accent: #009900;
  --color-bg-body: #FFFCEA;
  --color-bg-white: #ffffff;
  --color-text-main: #333333;
  --color-text-light: #666666;
  --color-border: #e0e0e0;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Typography */
  --font-main: "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--color-bg-body);
  color: var(--color-text-main);
  line-height: 1.7;
  font-size: var(--text-md);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s, opacity 0.2s;
}

a:hover {
  opacity: 0.8;
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: 200;
  transition: top 0.3s;
  font-weight: bold;
  border-radius: 0 0 4px 4px;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

:is(a, button, input, .product-card):focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px var(--color-bg-body);
}

.close-modal:focus-visible {
  outline-offset: 4px;
}

ul {
  list-style: none;
}

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

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Header */
.site-header {
  background-color: var(--color-bg-white);
  border-bottom: 3px solid var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.logo {
  font-size: var(--text-xl);
  font-weight: bold;
  color: var(--color-accent);
}

.header-actions {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.btn-lang {
  background: none;
  border: 1px solid var(--color-border);
  padding: var(--spacing-xs) var(--spacing-sm);
  cursor: pointer;
  border-radius: 4px;
  font-size: var(--text-sm);
}

.btn-login {
  background: var(--color-primary);
  color: white;
  border: none;
  padding: var(--spacing-xs) var(--spacing-md);
  cursor: pointer;
  border-radius: 4px;
  font-weight: bold;
  font-size: var(--text-sm);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-primary);
  padding: var(--spacing-xs);
}

.main-nav {
  padding: var(--spacing-sm) 0;
  border-top: 1px solid var(--color-border);
}

.main-nav ul {
  display: flex;
  gap: var(--spacing-xl);
  justify-content: center;
}

.main-nav a {
  font-weight: 500;
  font-size: var(--text-sm);
  padding: var(--spacing-xs) 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s;
}

.main-nav a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-bg-white) 0%, #f5f5dc 100%);
  padding: var(--spacing-2xl) 0;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.hero h1 {
  color: var(--color-accent);
  font-size: var(--text-2xl);
  margin-bottom: var(--spacing-md);
}

.hero p {
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* Main Layout */
.app-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--spacing-xl);
  padding: var(--spacing-xl) 0;
}

/* Sidebar */
.sidebar {
  background-color: var(--color-bg-white);
  padding: var(--spacing-lg);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  height: fit-content;
  position: sticky;
  top: 100px;
}

.sidebar h3 {
  color: var(--color-primary);
  font-size: var(--text-md);
  border-bottom: 2px solid var(--color-primary);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-xs);
}

.sidebar-menu li {
  border-bottom: 1px solid #f0f0f0;
}

.sidebar-menu a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-xs);
  font-size: var(--text-sm);
  transition: background-color 0.2s, padding-left 0.2s;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
  color: var(--color-accent);
  background-color: rgba(140, 186, 38, 0.1);
  padding-left: var(--spacing-sm);
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.product-card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.product-image {
  aspect-ratio: 1;
  background-color: #f9f9f9;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-info {
  padding: var(--spacing-md);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.product-category {
  font-size: var(--text-xs);
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.product-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-main);
  line-height: 1.4;
}

.product-price {
  color: var(--color-accent);
  font-weight: bold;
  font-size: var(--text-md);
  margin-top: auto;
}

.product-price small {
  font-weight: normal;
  font-size: var(--text-xs);
  color: var(--color-text-light);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  padding: var(--spacing-lg);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-content {
  background-color: var(--color-bg-white);
  width: 100%;
  max-width: 700px;
  max-height: 85vh;
  overflow-y: auto;
  border-radius: 12px;
  position: relative;
  padding: var(--spacing-xl);
}

.close-modal {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: var(--color-bg-body);
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Login Modal Specifics */
#login-modal .modal-content {
  max-width: 400px;
  text-align: center;
}

#login-modal h2 {
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}

#login-modal label {
  display: block;
  text-align: left;
  font-size: var(--text-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

/* Space out the second label */
#login-modal label[for="password"] {
  margin-top: var(--spacing-sm);
}

#login-modal input {
  width: 100%;
  margin: 0; /* Remove default margin */
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 1rem;
}

#login-modal .btn-primary {
  margin-top: 1rem;
}

#login-modal p {
  margin-top: 1.5rem;
  font-size: 0.875rem;
  color: #666;
}

#login-modal p a {
  color: var(--color-primary);
  text-decoration: underline;
}

#modal-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.modal-image img {
  border-radius: 8px;
  width: 100%;
}

.modal-info h2 {
  margin: var(--spacing-sm) 0;
}

.modal-price {
  color: var(--color-accent);
  font-size: var(--text-xl);
  font-weight: bold;
  margin: var(--spacing-md) 0;
}

.modal-description {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

.quantity-selector {
  background: var(--color-bg-body);
  padding: var(--spacing-md);
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.quantity-selector label {
  font-weight: 500;
}

.quantity-selector input {
  width: 60px;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  text-align: center;
}

.stock-status {
  color: var(--color-accent);
  font-size: var(--text-sm);
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  font-weight: bold;
  font-size: var(--text-md);
  border-radius: 8px;
  cursor: pointer;
  width: 100%;
  transition: background-color 0.2s;
}

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

/* Footer */
.site-footer {
  background-color: #2d2d2d;
  color: #ccc;
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  font-size: var(--text-md);
}

.footer-section p,
.footer-section li {
  font-size: var(--text-sm);
  line-height: 1.8;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid #444;
  color: #777;
  font-size: var(--text-xs);
}

@media (prefers-reduced-motion: no-preference) { :root { scroll-behavior: smooth; } }
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem;
  background-color: var(--color-primary-dark); color: white;
  width: 44px; height: 44px; border-radius: 50%; border: none;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2); z-index: 90;
  transition: opacity 0.3s, visibility 0.3s, transform 0.2s;
  opacity: 0; visibility: hidden;
}
.back-to-top.active { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-3px); }

/* ===============================
   RESPONSIVE - MOBILE FIRST
   =============================== */

@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
  }

  .sidebar h3 {
    grid-column: 1 / -1;
  }

  .sidebar-menu {
    display: contents;
  }

  .sidebar-menu li {
    border: 1px solid var(--color-border);
    border-radius: 4px;
  }

  .sidebar-menu a {
    text-align: center;
    padding: var(--spacing-sm);
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-bg-white);
    border-bottom: 2px solid var(--color-primary);
    padding: var(--spacing-md);
    display: none;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  }

  .main-nav.active {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .main-nav li {
    border-bottom: 1px solid var(--color-border);
  }

  .main-nav a {
    display: block;
    padding: var(--spacing-md);
    text-align: center;
  }

  .hero {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .hero h1 {
    font-size: var(--text-xl);
  }

  .hero p {
    font-size: var(--text-sm);
  }

  /* MOBILE WHITESPACE IMPROVEMENTS */
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }

  .product-card {
    border-radius: 6px;
  }

  .product-info {
    padding: var(--spacing-sm);
  }

  .product-title {
    font-size: var(--text-xs);
    -webkit-line-clamp: 2;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .product-price {
    font-size: var(--text-sm);
  }

  .product-category {
    display: none;
  }

  /* Modal Mobile */
  .modal-overlay {
    padding: var(--spacing-sm);
    align-items: flex-end;
  }

  .modal-content {
    max-height: 90vh;
    border-radius: 16px 16px 0 0;
    padding: var(--spacing-lg);
  }

  #modal-details {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .modal-image img {
    max-height: 200px;
    object-fit: contain;
  }

  .modal-price {
    font-size: var(--text-lg);
  }

  /* Sidebar Mobile */
  .sidebar {
    padding: var(--spacing-md);
    grid-template-columns: repeat(3, 1fr);
  }

  .sidebar-menu a {
    font-size: var(--text-xs);
    padding: var(--spacing-xs);
  }

  .footer-content {
    gap: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .header-actions {
    gap: var(--spacing-xs);
  }

  .btn-lang,
  .btn-login {
    padding: var(--spacing-xs);
    font-size: var(--text-xs);
  }

  .logo {
    font-size: var(--text-lg);
  }

  .product-grid {
    gap: var(--spacing-sm);
  }

  .sidebar {
    grid-template-columns: repeat(2, 1fr);
  }
}