/* 기본 리셋 및 폰트 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

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

:root {
  --primary: #4F6BED;
  --primary-light: #EEF1FD;
  --primary-dark: #3754D4;
  --text: #1A1A2E;
  --text-secondary: #6B7280;
  --bg: #F8F9FC;
  --card-bg: #FFFFFF;
  --border: #E5E7EB;
  --sidebar-width: 220px;
}

body {
  font-family: 'Noto Sans KR', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 14px;
}

/* 헤더 */
.header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.header-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-title span {
  font-size: 22px;
}

/* 검색창 */
.search-wrap {
  flex: 1;
  max-width: 400px;
  margin: 0 32px;
  position: relative;
}

.search-wrap input {
  width: 100%;
  padding: 8px 16px 8px 38px;
  border: 1.5px solid var(--border);
  border-radius: 24px;
  font-family: inherit;
  font-size: 13px;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.2s;
  outline: none;
}

.search-wrap input:focus {
  border-color: var(--primary);
  background: #fff;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  font-size: 15px;
}

.item-count-badge {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* 레이아웃 */
.layout {
  display: flex;
  margin-top: 60px;
  min-height: calc(100vh - 60px);
}

/* 사이드바 */
.sidebar {
  width: var(--sidebar-width);
  background: #fff;
  border-right: 1px solid var(--border);
  padding: 20px 12px;
  position: fixed;
  top: 60px;
  left: 0;
  bottom: 0;
  overflow-y: auto;
}

.sidebar-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0 8px;
  margin-bottom: 8px;
}

.category-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  margin-bottom: 2px;
  user-select: none;
}

.category-item:hover {
  background: var(--primary-light);
}

.category-item.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 500;
}

.category-item-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.category-icon {
  font-size: 15px;
}

.category-name {
  font-size: 13px;
}

.category-count {
  font-size: 11px;
  color: var(--text-secondary);
  background: var(--bg);
  padding: 1px 7px;
  border-radius: 10px;
  min-width: 24px;
  text-align: center;
}

.category-item.active .category-count {
  background: var(--primary);
  color: #fff;
}

/* 메인 콘텐츠 */
.main {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 28px 32px;
}

.section-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 카드 그리드 */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

/* 자료 카드 */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  transition: box-shadow 0.2s, transform 0.2s;
  cursor: default;
}

.card:hover {
  box-shadow: 0 4px 16px rgba(79,107,237,0.10);
  transform: translateY(-2px);
}

.card-clickable {
  cursor: pointer;
}

.card-clickable:hover {
  box-shadow: 0 6px 20px rgba(79,107,237,0.18);
  border-color: #4F6BED;
}

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

.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.card-category-badge {
  font-size: 11px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 8px;
  border-radius: 10px;
  white-space: nowrap;
  flex-shrink: 0;
}

.card-content {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.card-date {
  font-size: 11px;
  color: var(--text-secondary);
}

.card-tags {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.card-tag {
  font-size: 11px;
  color: var(--text-secondary);
  background: var(--bg);
  padding: 2px 7px;
  border-radius: 8px;
}

.card-url {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--primary);
  text-decoration: none;
  margin-top: 8px;
}

.card-url:hover {
  text-decoration: underline;
}

/* 빈 상태 */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-state .emoji {
  font-size: 48px;
  margin-bottom: 16px;
}

.empty-state p {
  font-size: 15px;
}

/* 반응형 */
@media (max-width: 768px) {
  .sidebar {
    display: none;
  }
  .main {
    margin-left: 0;
    padding: 20px 16px;
  }
  .header-title {
    font-size: 15px;
  }
  .search-wrap {
    margin: 0 12px;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
}