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

:root {
  --primary: #1a1a2e;
  --secondary: #6b7280;
  --bg: #f5f5f7;
  --white: #ffffff;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
  --radius: 16px;
  --radius-sm: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Hiragino Sans', sans-serif;
  background: var(--bg);
  color: var(--primary);
  min-height: 100vh;
  line-height: 1.6;
}

/* Header */
header {
  background: var(--white);
  padding: 2rem;
  text-align: center;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--secondary);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* Filters */
.filters {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.5rem 1rem;
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.filter-btn {
  padding: 0.6rem 1.25rem;
  border: none;
  background: var(--white);
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow);
  color: var(--secondary);
}

.filter-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.filter-btn.active {
  background: var(--primary);
  color: var(--white);
}

/* Cards Grid */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* Card */
.card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.card-emoji {
  font-size: 3rem;
}

.card-body {
  padding: 1.25rem;
}

.card-category {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 1rem;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.card-date {
  font-size: 0.8rem;
  color: var(--secondary);
  margin-bottom: 0.5rem;
}

.card-memo {
  font-size: 0.875rem;
  color: var(--secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.hidden {
  display: none;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--white);
  border-radius: var(--radius);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.2);
}

.modal .close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  background: var(--bg);
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--secondary);
  transition: all 0.2s ease;
  z-index: 10;
}

.modal .close-btn:hover {
  background: var(--primary);
  color: var(--white);
}

.modal-body {
  padding: 2rem;
}

.modal .category-badge {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 1rem;
}

.modal .place-name {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.modal .visit-date {
  color: var(--secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.modal .place-image {
  margin-bottom: 1.5rem;
}

.modal .place-image img {
  width: 100%;
  border-radius: var(--radius-sm);
  max-height: 300px;
  object-fit: cover;
}

.modal .place-memo {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.modal .place-address {
  color: var(--secondary);
  font-size: 0.875rem;
  padding-top: 1rem;
  border-top: 1px solid var(--bg);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--secondary);
}

.empty-state-emoji {
  font-size: 3rem;
  margin-bottom: 1rem;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--secondary);
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 640px) {
  header {
    padding: 1.5rem 1rem;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .filters {
    padding: 1rem 0.75rem;
    gap: 0.4rem;
  }

  .filter-btn {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
  }

  .cards-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .modal-body {
    padding: 1.5rem;
  }
}