/* ==========================================================================
   Base Styles & Variables
   ========================================================================== */
:root {
  /* Color Palette */
  --color-primary: #0b4c3e; /* 深緑 */
  --color-secondary: #d4af37; /* ゴールド */
  --color-text-main: #333333;
  --color-text-light: #666666;
  --color-bg-base: #f9f9f9; /* 薄グレー */
  --color-bg-white: #ffffff;
  --color-border: #e0e0e0;
  
  /* Status Colors (JRA Style Popularity) */
  --color-pop-1: #ffcdd2; /* 1番人気: 薄いピンク・赤紫系（よくある1番人気色） */
  --color-pop-2: #bbdefb; /* 2番人気: 薄い青系 */
  --color-pop-3: #c8e6c9; /* 3番人気: 薄い緑系 */
  --color-pop-mid: #fff59d; /* 4〜6番人気: 薄い黄色系 */
  --color-pop-low: #eeeeee; /* 7番人気以降: 薄いグレー系 */

  /* Typography */
  --font-family-base: 'Noto Sans JP', sans-serif;
  --font-size-base: 16px; /* スマホ16px基準 */
  
  /* Layout */
  --container-width: 1000px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  
  /* Utility */
  --radius-sm: 4px;
  --radius-md: 8px;
  --shadow-sm: 0 2px 5px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 10px rgba(0,0,0,0.1);
  --transition-fast: 0.2s ease;
}

html {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  color: var(--color-text-main);
  background-color: var(--color-bg-base);
  line-height: 1.6;
  scroll-behavior: smooth; /* スムーススクロール */
}

body {
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

*, *::before, *::after {
  box-sizing: border-box;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-secondary);
}

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  background-color: var(--color-primary);
  color: var(--color-bg-white);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

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

.site-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.header-logo {
  height: 40px;
  width: auto;
  border-radius: 4px;
  background-color: var(--color-bg-white); /* 透過時の見えにくさ解消のため白背景付与 */
  padding: 2px;
}

.site-title a {
  color: var(--color-bg-white);
}

.site-title a:hover {
  color: var(--color-secondary);
}

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

.main-nav a {
  color: var(--color-bg-white);
  font-weight: 500;
  font-size: 0.9rem;
}

.main-nav a:hover {
  color: var(--color-secondary);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  background-color: var(--color-bg-white);
  padding: var(--spacing-lg) 0;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-lg);
}

.hero-logo {
  max-width: 250px;
  margin: 0 auto var(--spacing-md) auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: block;
}

.hero p {
  margin: 0;
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 700px;
  margin: 0 auto;
}

/* ==========================================================================
   Typography & Sections
   ========================================================================== */
.section {
  margin-bottom: var(--spacing-xl);
  background-color: var(--color-bg-white);
  padding: var(--spacing-lg) var(--spacing-sm);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.section-title {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  font-size: 1.5rem;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-secondary);
  padding-bottom: var(--spacing-xs);
  display: inline-block;
}

.subsection-title {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
  color: var(--color-primary);
  border-left: 4px solid var(--color-secondary);
  padding-left: var(--spacing-xs);
}

/* ==========================================================================
   Cards & Layouts
   ========================================================================== */
/* Grid for Cards (Mobile: 1 col) */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-sm);
}

.race-card {
  display: block;
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  color: var(--color-text-main);
  box-shadow: var(--shadow-sm);
}

.race-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--color-text-main);
  border-color: var(--color-secondary);
}

.race-card-title {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: 1.25rem;
  color: var(--color-primary);
}

.race-card-meta {
  display: flex;
  gap: var(--spacing-sm);
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
  align-items: center;
  flex-wrap: wrap;
}

.race-grade {
  color: var(--color-bg-white);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: bold;
  font-size: 0.8rem;
}
.grade-g1 { background-color: #d4af37; } /* ゴールド */
.grade-g2 { background-color: #e74c3c; } /* 赤 */
.grade-g3 { background-color: #2ecc71; } /* 緑 */

.race-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-primary);
  font-weight: 500;
  display: flex;
  align-items: center;
}

.race-card p::after {
  content: "→";
  margin-left: 5px;
  color: var(--color-secondary);
}

/* Grid for Links (Mobile: 1 col) */
.race-list-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-sm);
}

.race-list-item {
  display: block;
  padding: var(--spacing-sm);
  background-color: var(--color-bg-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 500;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.race-list-item:hover {
  background-color: var(--color-primary);
  color: var(--color-bg-white);
}

/* Accordion (Details/Summary) styles */
.grade-section details {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  overflow: hidden;
}

.grade-section summary {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  background-color: var(--color-bg-base);
  list-style: none; /* Hide default arrow */
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color var(--transition-fast);
}

.grade-section summary::-webkit-details-marker {
  display: none; /* Hide arrow in Safari */
}

.grade-section summary:hover {
  background-color: #f0f0f0;
}

.grade-section summary::after {
  content: "＋";
  font-size: 1.5rem;
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.grade-section details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

.grade-section details .race-list-grid {
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   Race Page Specifics
   ========================================================================== */
.race-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.race-header-title {
  font-size: 1.8rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.race-header-meta {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  color: var(--color-text-light);
  font-size: 1rem;
}

/* Page Navigation Buttons */
.page-nav {
  display:flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
}

.page-nav-btn {
  display: block;
  text-align: center;
  padding: var(--spacing-sm);
  background-color: var(--color-primary);
  color: var(--color-bg-white);
  border-radius: var(--radius-md);
  font-weight: 700;
  border: 1px solid var(--color-primary);
}

.page-nav-btn:hover {
  background-color: var(--color-bg-white);
  color: var(--color-primary);
}

/* Tables */
.table-scroll {
  width: 100%;
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch; /* iOSスワイプ用 */
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px; /* 横スクロール確保用 */
}

.data-table th,
.data-table td {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.9rem;
}

.data-table th:last-child,
.data-table td:last-child {
  border-right: none;
}

.data-table th {
  background-color: var(--color-bg-base);
  color: var(--color-text-light);
  font-weight: 500;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:nth-child(even) {
  background-color: rgba(0,0,0,0.02);
}

/* Color Utilities for Popularity */
.pop-1 { 
  background-color: var(--color-pop-1); 
  color: #333; 
  font-weight: bold; 
  padding: 2px 6px; 
  border-radius: 4px;
}
.pop-2 { 
  background-color: var(--color-pop-2); 
  color: #333; 
  font-weight: bold; 
  padding: 2px 6px; 
  border-radius: 4px;
}
.pop-3 { 
  background-color: var(--color-pop-3); 
  color: #333; 
  font-weight: bold; 
  padding: 2px 6px; 
  border-radius: 4px;
}
.pop-mid { 
  background-color: var(--color-pop-mid); 
  color: #333; 
  font-weight: bold; 
  padding: 2px 6px; 
  border-radius: 4px;
}
.pop-low { 
  background-color: var(--color-pop-low); 
  color: #333; 
  font-weight: bold; 
  padding: 2px 6px; 
  border-radius: 4px;
}

/* Waku Colors (JRA Standard) */
.waku-1 { background-color: #ffffff; color: #333; border: 1px solid #ccc; }
.waku-2 { background-color: #333333; color: #fff; border: 1px solid #333333; }
.waku-3 { background-color: #e74c3c; color: #fff; border: 1px solid #e74c3c; }
.waku-4 { background-color: #3498db; color: #fff; border: 1px solid #3498db; }
.waku-5 { background-color: #f1c40f; color: #333; border: 1px solid #f1c40f; }
.waku-6 { background-color: #2ecc71; color: #fff; border: 1px solid #2ecc71; }
.waku-7 { background-color: #e67e22; color: #fff; border: 1px solid #e67e22; }
.waku-8 { background-color: #e84393; color: #fff; border: 1px solid #e84393; }

.waku-cell {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: bold;
  min-width: 36px;
  text-align: center;
}

/* Trends Text block */
.trend-box {
  background-color: var(--color-bg-base);
  border-left: 4px solid var(--color-secondary);
  padding: var(--spacing-md);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: var(--spacing-md);
}

.trend-box p {
  margin: 0 0 var(--spacing-xs) 0;
  display: flex;
  align-items: flex-start;
}
.trend-box p:last-child {
  margin: 0;
}
.trend-box p::before {
  content: "✓";
  color: var(--color-primary);
  margin-right: 8px;
  font-weight: bold;
}

/* Predictions */
.prediction-box {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xs);
  background-color: var(--color-bg-base);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.prediction-item {
  display: flex;
  align-items: center;
  font-size: 1.1rem;
  padding: var(--spacing-xs) 0;
  border-bottom: 1px dashed var(--color-border);
}
.prediction-item:last-child {
  border-bottom: none;
}

.prediction-mark {
  font-size: 1.5rem;
  color: var(--color-primary);
  width: 40px;
  text-align: center;
  font-weight: bold;
}

/* Ad Placeholders */
.ad-slot {
  width: 100%;
  padding: var(--spacing-md) 0;
  margin: var(--spacing-md) 0;
  background-color: #f0f0f0;
  border: 1px dashed #ccc;
  text-align: center;
  color: #999;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-primary);
  color: var(--color-bg-white);
  padding: var(--spacing-lg) 0;
  text-align: center;
  margin-top: var(--spacing-xl);
}

.site-footer p {
  margin: 0;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
}

/* ==========================================================================
   Media Queries (PC / Tablet)
   ========================================================================== */
@media (min-width: 768px) {
  .header-inner {
    flex-direction: row;
    justify-content: space-between;
  }
  
  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
  
  .race-list-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .page-nav {
    flex-direction: row;
    justify-content: center;
  }
  
  .page-nav-btn {
    flex: 1;
    max-width: 200px;
  }

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

@media (min-width: 992px) {
  .race-list-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}