/* ==========================================
   Base & Variables
   ========================================== */
:root {
  --bg-color: #0f1117;          /* ダークサイバーな背景 */
  --card-bg: #1a1d26;          /* カードの背景 */
  --accent-color: #19cc00;      /* Halo・Nexusカラー（蛍光グリーン） */
  --accent-hover: #15ad00;
  --auction-color: #ff3b30;     /* オークション強調のレッド */
  --text-main: #f0f2f5;
  --text-sub: #8e95a5;
  --border-color: #2a2e3d;
  --header-bg: rgba(15, 17, 23, 0.85);
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
}

/* ==========================================
   Header
   ========================================== */
.header {
  position: sticky;
  top: 0;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
}

.header-container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-mark {
  font-size: 1.5rem;
  color: var(--accent-color);
}

.site-name {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: #fff;
}

.search-bar {
  flex: 1;
  max-width: 500px;
}

.search-bar input {
  width: 100%;
  padding: 10px 16px;
  background-color: #242836;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: #fff;
  outline: none;
}

.search-bar input:focus {
  border-color: var(--accent-color);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-links a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.cart-btn span {
  color: var(--accent-color);
}

/* ==========================================
   Main Layout
   ========================================== */
.main-container {
  max-width: 1300px;
  margin: 30px auto;
  padding: 0 24px;
  display: flex;
  gap: 32px;
}

/* サイドバー */
.sidebar {
  width: 220px;
  flex-shrink: 0;
}

.sidebar h3 {
  font-size: 0.95rem;
  color: var(--text-sub);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.category-list {
  list-style: none;
  margin-bottom: 30px;
}

.category-list li a {
  display: block;
  padding: 8px 12px;
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.9rem;
  border-radius: 6px;
  transition: background-color 0.2s;
}

.category-list li a:hover,
.category-list li a.active {
  background-color: #242836;
  color: var(--accent-color);
  font-weight: 600;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  background-color: #242836;
  color: var(--text-sub);
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 12px;
  cursor: pointer;
}

.tag:hover {
  color: #fff;
  background-color: var(--accent-color);
}

/* 商品エリア */
.products-area {
  flex: 1;
}

.section-title-wrap {
  margin-bottom: 20px;
}

.section-title-wrap h2 {
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  gap: 12px;
}

.subtitle {
  font-size: 0.85rem;
  color: var(--text-sub);
  font-weight: 400;
}

/* Grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 50px;
}

/* Card Common */
.product-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s, border-color 0.2s;
}

.product-card:hover {
  transform: translateY(-4px);
  border-color: #3b4258;
}

.image-wrapper {
  position: relative;
  width: 100%;
  height: 160px;
  background-color: #12141c;
}

.image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.tags {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
}

.tag-mini {
  font-size: 0.7rem;
  background-color: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text-sub);
}

.product-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 12px;
  height: 2.8em;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.data-density {
  font-size: 0.8rem;
  color: var(--text-sub);
  margin-bottom: 12px;
}

.data-density strong {
  color: var(--accent-color);
}

/* % 選択ボタン */
.density-selector {
  margin-bottom: 12px;
}

.selector-label {
  font-size: 0.75rem;
  color: var(--text-sub);
  display: block;
  margin-bottom: 4px;
}

.density-options {
  display: flex;
  gap: 4px;
}

.option {
  font-size: 0.7rem;
  padding: 4px 6px;
  background-color: #242836;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-sub);
}

.option.active {
  background-color: rgba(25, 204, 0, 0.15);
  border-color: var(--accent-color);
  color: var(--accent-color);
  font-weight: 600;
}

.price-row {
  margin-top: auto;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.price {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}

.price-sub {
  font-size: 0.75rem;
  color: var(--text-sub);
  font-weight: 400;
}

.stock-info {
  font-size: 0.75rem;
  margin-top: 8px;
}

.status-ok { color: var(--text-sub); }
.status-few { color: #ff9500; font-weight: 600; }

/* ==========================================
   Auction Special Styles
   ========================================== */
.auction-card {
  border-color: rgba(255, 59, 48, 0.3);
}

.auction-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background-color: var(--auction-color);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  z-index: 2;
}

.timer-overlay {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  color: #ff453a;
}

.seller-type {
  font-size: 0.7rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.seller-type.official { color: #0a84ff; }
.seller-type.pro { color: #bf5af2; }

.auction-info {
  margin-top: auto;
  display: flex;
  flex-direction: column;
}

.price-label {
  font-size: 0.7rem;
  color: var(--text-sub);
}

/* レスポンシブ対応 */
@media (max-width: 900px) {
  .main-container {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
  }
}