:root {
  /* Colors */
  --primary-red: #D32F2F;      /* お正月らしい赤 */
  --primary-gold: #FFD700;     /* 金色 */
  --accent-pink: #F8BBD0;      /* 桜色 */
  --text-dark: #1A237E;        /* 濃紺 */
  --bg-white: #FAFAFA;         /* 背景色 */
  --card-bg: #FFFFFF;
  --border-common: #E0E0E0;
  --border-rare: #FFD700;
  
  /* Text Colors */
  --text-main: #333333;
  --text-light: #757575;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 16px rgba(0,0,0,0.2);
  
  /* Animation */
  --transition-speed: 0.3s;
}

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

body {
  font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  background-color: var(--bg-white);
  color: var(--text-main);
  background-image: 
    radial-gradient(var(--accent-pink) 2px, transparent 2px),
    radial-gradient(var(--accent-pink) 2px, transparent 2px);
  background-size: 50px 50px;
  background-position: 0 0, 25px 25px;
  min-height: 100vh;
}

/* Header */
header {
  background: linear-gradient(135deg, var(--primary-red), #B71C1C);
  color: white;
  padding: 1rem 0;
  text-align: center;
  position: relative;
  box-shadow: var(--shadow-md);
  margin-bottom: 2rem;
}

.new-year-banner {
  font-size: 0.9rem;
  letter-spacing: 2px;
  margin-bottom: 0.5rem;
  opacity: 0.9;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header-status {
  position: absolute;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  background: rgba(255,255,255,0.2);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  backdrop-filter: blur(5px);
}

/* Controls */
.controls-container {
  max-width: 1200px;
  margin: 0 auto 2rem;
  padding: 0 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.search-bar input {
  width: 100%;
  padding: 1rem;
  font-size: 1.1rem;
  border: 2px solid var(--border-common);
  border-radius: 50px;
  outline: none;
  transition: border-color var(--transition-speed);
}

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

.filters {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  background: white;
  padding: 1rem;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.filter-group {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.filter-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-common);
  border-radius: 20px;
  background: white;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn.active {
  background: var(--text-dark);
  color: white;
  border-color: var(--text-dark);
}

select {
  padding: 0.5rem 2rem 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-common);
  font-size: 1rem;
  cursor: pointer;
}

/* Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto 3rem;
  padding: 0 1rem;
}

/* Base Card */
.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  position: relative;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
  border: 2px solid var(--border-common);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

/* Rarity Styles */
.card.common {
  border-color: #BDBDBD;
}

.card.rare {
  border-color: #FFD700;
  box-shadow: 0 0 10px rgba(255, 215, 0, 0.2);
}

.card.legendary {
  border: 2px solid transparent;
  background-image: linear-gradient(white, white), 
                    linear-gradient(45deg, #FFD700, #FF4081, #00B0FF, #FFD700);
  background-origin: border-box;
  background-clip: content-box, border-box;
  box-shadow: 0 0 15px rgba(255, 215, 0, 0.4);
  animation: shimmer 3s infinite linear;
}

@keyframes shimmer {
  0% { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(360deg); }
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
}

.card-no {
  font-size: 0.8rem;
  color: var(--text-light);
  font-family: monospace;
}

.fav-btn {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: #E0E0E0;
  transition: color 0.2s, transform 0.2s;
}

.fav-btn.active {
  color: #FF4081;
  transform: scale(1.1);
}

.card-title {
  font-size: 1.4rem;
  font-weight: bold;
  margin: 0.5rem 0 0.2rem;
}

.card-reading {
  font-size: 0.8rem;
  color: var(--text-light);
}

.card-tags {
  display: flex;
  gap: 0.5rem;
  margin-top: auto;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: #F5F5F5;
  color: #616161;
}

.difficulty {
  color: #FF9800;
  font-size: 0.9rem;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  backdrop-filter: blur(3px);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: white;
  width: 90%;
  max-width: 600px;
  border-radius: 16px;
  padding: 2rem;
  position: relative;
  transform: scale(0.9);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.open .modal-content {
  transform: scale(1);
}

.close-btn {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-light);
}

.modal-header {
  text-align: center;
  border-bottom: 2px solid #F5F5F5;
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.modal-section {
  margin-bottom: 1.5rem;
}

.modal-section h3 {
  font-size: 1rem;
  color: var(--text-light);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.text-content {
  line-height: 1.6;
  font-size: 1.1rem;
}

.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: white;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: transform 0.2s;
  z-index: 1010;
}

.nav-btn:hover {
  transform: translateY(-50%) scale(1.1);
}

.prev-btn { left: -60px; }
.next-btn { right: -60px; }

/* Responsive */
@media (max-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .filters {
    flex-direction: column;
    align-items: stretch;
  }
  
  .prev-btn { left: 10px; }
  .next-btn { right: 10px; }
  
  .nav-btn {
    background: rgba(255,255,255,0.8);
  }
}

@media (max-width: 480px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  h1 { font-size: 1.5rem; }
  
  .header-status {
    position: static;
    display: inline-block;
    margin-top: 1rem;
    transform: none;
  }
  
  .modal-content {
    padding: 1.5rem;
    width: 95%;
  }
}

/* Utility */
.hidden { display: none !important; }