/* =========================================
   교과연계독서 - 공통 디자인 시스템
   reading-common.css
========================================= */

:root {
    --reading-green-50: #f0fdf4;
    --reading-green-100: #dcfce7;
    --reading-green-200: #bbf7d0;
    --reading-green-300: #86efac;
    --reading-green-400: #4ade80;
    --reading-green-500: #22c55e;
    --reading-green-600: #16a34a;
    --reading-green-700: #15803d;
}

/* ===== 왼쪽 사이드바 ===== */
.page-sidebar-left .sidebar-nav-header {
    background: linear-gradient(135deg, var(--reading-green-500) 0%, var(--reading-green-400) 100%) !important;
}

.page-sidebar-left .sidebar-nav-title,
.page-sidebar-left .sidebar-nav-subtitle {
    color: white !important;
}

.sidebar-nav-link.active {
    background: var(--reading-green-50) !important;
    border-left-color: var(--reading-green-500) !important;
    color: var(--reading-green-700) !important;
}

.sidebar-nav-link:hover {
    background: var(--reading-green-100) !important;
    color: var(--reading-green-700) !important;
}

.sidebar-nav-count {
    background: var(--reading-green-100) !important;
    color: var(--reading-green-700) !important;
}

/* ===== 섹션 헤더 ===== */
.section-header {
    border-bottom: 2px solid var(--reading-green-200) !important;
    padding-bottom: 12px;
    margin-bottom: 16px;
}

.section-title {
    color: var(--reading-green-700) !important;
}

/* ===== 통계 카드 (공통) ===== */
.stats-card {
    padding: 12px;
    text-align: center;
    border-bottom: 1px solid var(--reading-green-100);
}

.stats-card:last-child {
    border-bottom: none;
}

.stats-label {
    font-size: 0.75rem;
    color: #666;
    margin-bottom: 4px;
}

.stats-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--reading-green-600);
}

/* ===== 빈 상태 ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: var(--reading-green-50);
    border-radius: 12px;
}

.empty-state i {
    font-size: 3rem;
    color: var(--reading-green-300);
    margin-bottom: 16px;
}

.empty-state h4 {
    color: #666;
    margin-bottom: 8px;
}

.empty-state p {
    color: #999;
}