:root {
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-color: #1e293b;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --border-color: #e2e8f0;
  --input-bg: #ffffff;
  --shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --excel-color: #166534;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-color: #f1f5f9;
  --accent-color: #38bdf8;
  --accent-hover: #7dd3fc;
  --border-color: #334155;
  --input-bg: #0f172a;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: 'Pretendard', sans-serif;
  margin: 0;
  padding: 0;
  transition: all 0.3s ease;
  line-height: 1.6;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
}

.logo-link { text-decoration: none; color: inherit; }
.logo { font-size: 1.8rem; font-weight: 800; margin: 0; }

/* 카테고리 그리드 */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.category-card {
  background-color: var(--card-bg);
  padding: 30px;
  border-radius: 20px;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.category-card:hover {
  transform: translateY(-10px);
  border-color: var(--accent-color);
}

.category-card .icon { font-size: 3rem; margin-bottom: 15px; }
.category-card h3 { margin: 0 0 10px 0; font-size: 1.4rem; }
.category-card p { margin: 0; font-size: 0.95rem; opacity: 0.8; }

/* 상세 페이지 공통 */
.page-card {
  background-color: var(--card-bg);
  padding: 40px;
  border-radius: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  margin-bottom: 30px;
}

.back-link {
  display: inline-block;
  margin-bottom: 20px;
  text-decoration: none;
  color: var(--accent-color);
  font-weight: 600;
}

/* 엑셀 전용 스타일 */
.excel-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}
.excel-table th, .excel-table td {
  padding: 12px;
  border: 1px solid var(--border-color);
  text-align: left;
}
.excel-table th { background-color: rgba(22, 101, 52, 0.1); color: var(--excel-color); }
.shortcut-key {
  background: #e2e8f0;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  font-weight: bold;
}

.main-btn {
  background-color: var(--accent-color);
  color: white;
  border: none;
  padding: 16px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 700;
  width: 100%;
  transition: all 0.2s;
}

.main-footer {
  margin-top: 60px;
  text-align: center;
  padding: 40px 0;
  opacity: 0.6;
  font-size: 0.9rem;
}
.footer-links a { margin: 0 10px; text-decoration: none; color: inherit; font-weight: 600; }

#theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
}

#recommendation-display, #info-display {
  padding: 25px;
  margin: 20px 0;
  background-color: var(--bg-color);
  border-radius: 12px;
  border-left: 5px solid var(--accent-color);
  font-size: 1.2rem;
  font-weight: 600;
}

.map-btn {
  display: block;
  background-color: #fee500;
  color: #191919;
  text-decoration: none;
  padding: 14px;
  border-radius: 12px;
  font-weight: 700;
  text-align: center;
  margin-top: 15px;
}