/*
 * style.css
 * Kindleコミックセール速報
 * モバイルファースト設計 / Amazon風オレンジアクセント
 */

/* ===== リセット・ベース ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-amazon-orange: #FF9900;
  --color-amazon-orange-dark: #E47911;
  --color-amazon-blue: #146EB4;
  --color-discount-red: #C0392B;
  --color-discount-bg: #E74C3C;
  --color-text: #111111;
  --color-text-secondary: #555555;
  --color-text-muted: #888888;
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F7F7F7;
  --color-bg-header: #131921;
  --color-bg-footer: #232F3E;
  --color-border: #DDDDDD;
  --color-card-shadow: rgba(0, 0, 0, 0.12);
  --border-radius: 6px;
  --border-radius-lg: 10px;
  --font-base: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.18s ease;
  --max-width: 1280px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-amazon-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  color: var(--color-amazon-orange-dark);
}

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

ul, ol {
  list-style: none;
}

/* ===== レイアウト共通 ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 12px;
}

@media (min-width: 768px) {
  .container {
    padding: 0 20px;
  }
}

.main-content {
  flex: 1;
  padding: 16px 0 40px;
}

/* ===== ヘッダー ===== */
.site-header {
  background-color: var(--color-bg-header);
  color: #FFFFFF;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 12px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 700;
  white-space: nowrap;
  flex-shrink: 0;
}

.site-logo:hover {
  color: var(--color-amazon-orange);
  text-decoration: none;
}

.site-logo .logo-icon {
  font-size: 1.4rem;
}

.header-tagline {
  font-size: 0.7rem;
  color: #AAAAAA;
  display: none;
}

@media (min-width: 600px) {
  .header-tagline {
    display: block;
  }
}

/* ===== フッター ===== */
.site-footer {
  background-color: var(--color-bg-footer);
  color: #CCCCCC;
  padding: 24px 0;
  font-size: 0.8rem;
  margin-top: auto;
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .site-footer .container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-associate {
  color: #FFDD99;
  font-size: 0.75rem;
  line-height: 1.5;
}

.footer-copyright {
  color: #999999;
}

/* ===== パンくず ===== */
.breadcrumb {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 8px 0;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

.breadcrumb li + li::before {
  content: '›';
  margin-right: 4px;
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-amazon-blue);
}

/* ===== ページタイトルエリア ===== */
.page-title-area {
  background: var(--color-bg);
  padding: 16px 0 12px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 16px;
}

.page-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

@media (min-width: 768px) {
  .page-title {
    font-size: 1.6rem;
  }
}

.page-subtitle {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 6px;
}

/* ===== セクションヘッダー ===== */
.section-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.section-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  border-left: 4px solid var(--color-amazon-orange);
  padding-left: 10px;
}

/* ===== 更新日時 ===== */
.updated-at {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

/* ===== セール一覧カード（トップページ） ===== */
.sale-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 500px) {
  .sale-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .sale-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.sale-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: 16px;
  cursor: pointer;
  transition: box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
}

.sale-card:hover {
  box-shadow: 0 4px 16px var(--color-card-shadow);
  transform: translateY(-2px);
  text-decoration: none;
  color: inherit;
}

.sale-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}

.sale-publisher {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-bg);
  background: var(--color-amazon-blue);
  padding: 2px 8px;
  border-radius: 20px;
  white-space: nowrap;
}

.sale-card-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
  flex: 1;
}

.sale-card-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.78rem;
  color: var(--color-text-secondary);
}

.sale-card-meta .meta-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.sale-card-meta .icon {
  width: 14px;
  text-align: center;
  flex-shrink: 0;
}

.sale-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-border);
  padding-top: 10px;
  margin-top: auto;
}

.sale-book-count {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}

.sale-book-count span {
  color: var(--color-discount-red);
  font-size: 1.1rem;
}

.sale-discount-badge {
  display: inline-block;
  background: var(--color-discount-bg);
  color: #FFFFFF;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
}

.sale-period-badge {
  font-size: 0.72rem;
  color: var(--color-text-muted);
}

.sale-remaining {
  font-size: 0.78rem;
  font-weight: 600;
}

.sale-remaining.urgent {
  color: var(--color-discount-red);
}

.sale-remaining.soon {
  color: #E67E22;
}

.sale-remaining.normal {
  color: var(--color-text-secondary);
}

.sale-arrow {
  font-size: 1rem;
  color: var(--color-amazon-orange);
}

/* ===== 空状態 ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
}

.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

/* ===== フィルタバー（sale.php） ===== */
.filter-bar {
  background: var(--color-bg);
  border-bottom: 2px solid var(--color-amazon-orange);
  padding: 10px 0;
  position: sticky;
  top: 56px; /* ヘッダー高さ分 */
  z-index: 90;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

.filter-bar .container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.filter-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.filter-select {
  font-size: 0.82rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 5px 24px 5px 8px;
  appearance: none;
  background: var(--color-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23888' stroke-width='1.5' fill='none'/%3E%3C/svg%3E") no-repeat right 8px center;
  cursor: pointer;
  color: var(--color-text);
  min-width: 100px;
}

.filter-select:focus {
  outline: 2px solid var(--color-amazon-orange);
  outline-offset: 1px;
}

.filter-count {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  margin-left: auto;
  white-space: nowrap;
}

/* ===== 「Amazonでまとめて見る」ボタン ===== */
.btn-amazon {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-amazon-orange);
  color: #111111;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 10px 20px;
  border-radius: var(--border-radius);
  border: none;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-amazon:hover {
  background: var(--color-amazon-orange-dark);
  box-shadow: 0 2px 8px rgba(255, 153, 0, 0.4);
  color: #111111;
  text-decoration: none;
}

.btn-amazon .btn-icon {
  font-size: 1rem;
}

.btn-amazon-lg {
  padding: 12px 28px;
  font-size: 1rem;
}

/* ===== セールヘッダー（sale.php 上部情報エリア） ===== */
.sale-header-area {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: 16px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

@media (min-width: 768px) {
  .sale-header-area {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.sale-header-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sale-header-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
}

.badge-publisher {
  background: var(--color-amazon-blue);
  color: #FFFFFF;
}

.badge-period {
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.badge-count {
  background: var(--color-bg-secondary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.sale-remaining-large {
  font-size: 0.9rem;
  font-weight: 700;
}

.sale-remaining-large.urgent { color: var(--color-discount-red); }
.sale-remaining-large.soon   { color: #E67E22; }
.sale-remaining-large.normal { color: var(--color-text-secondary); }

/* ===== 書籍グリッド ===== */
.book-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

@media (min-width: 600px) {
  .book-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
  }
}

@media (min-width: 960px) {
  .book-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
}

/* ===== 書籍カード ===== */
.book-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}

.book-card:hover {
  box-shadow: 0 4px 14px var(--color-card-shadow);
  transform: translateY(-2px);
}

/* 割引率バッジ（カード左上） */
.book-discount-badge {
  position: absolute;
  top: 0;
  left: 0;
  background: var(--color-discount-bg);
  color: #FFFFFF;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 0 0 var(--border-radius) 0;
  z-index: 1;
  line-height: 1.3;
}

.book-cover-wrap {
  position: relative;
  background: #F0F0F0;
  aspect-ratio: 3 / 4;
  overflow: hidden;
}

.book-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

.book-card:hover .book-cover {
  transform: scale(1.03);
}

.book-cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 2rem;
  background: #E8E8E8;
}

.book-info {
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1;
}

.book-title {
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-author {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.book-genre {
  font-size: 0.68rem;
  color: var(--color-amazon-blue);
  background: #EBF4FB;
  display: inline-block;
  padding: 1px 6px;
  border-radius: 3px;
  align-self: flex-start;
}

.book-price-area {
  margin-top: auto;
  padding-top: 6px;
  border-top: 1px solid #F0F0F0;
}

.book-sale-price {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-discount-red);
}

.book-list-price {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  text-decoration: line-through;
}

.book-price-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
}

.book-amazon-link {
  display: block;
  text-align: center;
  background: var(--color-amazon-orange);
  color: #111111;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 8px;
  margin: 8px 10px 10px;
  border-radius: var(--border-radius);
  text-decoration: none;
  transition: background var(--transition);
}

.book-amazon-link:hover {
  background: var(--color-amazon-orange-dark);
  color: #111111;
  text-decoration: none;
}

/* ===== 価格注意書き ===== */
.price-notice {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  background: #FFFDE7;
  border: 1px solid #FFF176;
  border-radius: var(--border-radius);
  padding: 8px 12px;
  margin-top: 12px;
}

/* ===== アラート・お知らせ ===== */
.alert {
  border-radius: var(--border-radius);
  padding: 12px 16px;
  font-size: 0.85rem;
  margin-bottom: 16px;
}

.alert-warning {
  background: #FFF8E1;
  border: 1px solid #FFE082;
  color: #5D4037;
}

.alert-error {
  background: #FFEBEE;
  border: 1px solid #FFCDD2;
  color: var(--color-discount-red);
}

/* ===== ユーティリティ ===== */
.text-center { text-align: center; }
.mt-8  { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }

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