/* ===== 全局变量 ===== */
:root {
    --bg-primary: #f8f5f0;
    --bg-card: #ffffff;
    --bg-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --text-primary: #2c2416;
    --text-secondary: #6b5d4f;
    --text-light: #9b8e80;
    --accent: #c17b4a;
    --accent-light: #e8a87c;
    --accent-dark: #a05c2c;
    --border: #e8e0d4;
    --shadow: 0 2px 12px rgba(44, 36, 22, 0.08);
    --shadow-hover: 0 8px 24px rgba(44, 36, 22, 0.15);
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-icon {
    font-size: 24px;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.nav-link:hover {
    color: var(--accent);
    background: rgba(193, 123, 74, 0.08);
}

.nav-link.active {
    color: var(--accent);
    background: rgba(193, 123, 74, 0.12);
}

.nav-update {
    font-size: 12px;
    color: var(--text-light);
}

/* ===== Hero 区 ===== */
.hero-section {
    position: relative;
    padding: 80px 0 60px;
    overflow: hidden;
    background: var(--bg-hero);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M50 25 L55 40 L70 40 L58 50 L63 65 L50 55 L37 65 L42 50 L30 40 L45 40 Z'/%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.6;
}

.hero-content {
    position: relative;
    text-align: center;
    color: #fff;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

.hero-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: 2px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
}

.hero-stat-value {
    font-size: 42px;
    font-weight: 800;
    line-height: 1.2;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.hero-stat-label {
    font-size: 14px;
    opacity: 0.85;
    margin-top: 4px;
}

/* ===== 统计卡片 ===== */
.stats-cards-section {
    padding: 40px 0 20px;
    margin-top: -40px;
    position: relative;
    z-index: 10;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    text-align: center;
    border: 1px solid var(--border);
}

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

.stat-card-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.stat-card-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--accent-dark);
    margin-bottom: 4px;
}

.stat-card-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.stat-card-sub {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

/* ===== Section 标题 ===== */
.section-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 32px;
    color: var(--text-primary);
    text-align: center;
}

/* ===== 图表区 ===== */
.charts-section {
    padding: 60px 0;
}

.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.chart-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.chart-card.large {
    grid-column: 1 / -1;
}

.chart-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.chart-container {
    width: 100%;
    height: 320px;
}

/* ===== 读书排行 ===== */
.top-books-section {
    padding: 60px 0;
    background: rgba(193, 123, 74, 0.04);
}

.top-books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.top-book-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--border);
    cursor: pointer;
}

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

.top-book-rank {
    position: absolute;
    top: 8px;
    left: 8px;
    background: rgba(0, 0, 0, 0.7);
    color: #ffd700;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    z-index: 5;
}

.top-book-cover {
    position: relative;
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--bg-primary);
}

.top-book-info {
    padding: 14px 16px;
}

.top-book-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.top-book-author {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.top-book-time {
    font-size: 13px;
    color: var(--accent);
    font-weight: 600;
}

.top-book-tags {
    margin-top: 6px;
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.top-book-tag {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
    background: rgba(193, 123, 74, 0.12);
    color: var(--accent-dark);
}

/* ===== 书架 ===== */
.shelf-section {
    padding: 60px 0;
}

.shelf-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.shelf-filters {
    display: flex;
    align-items: center;
    gap: 16px;
}

.shelf-search {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    width: 200px;
    background: var(--bg-card);
    color: var(--text-primary);
}

.shelf-search:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(193, 123, 74, 0.15);
}

.filter-checkbox {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
}

.shelf-info {
    font-size: 13px;
    color: var(--text-light);
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.book-card {
    cursor: pointer;
    transition: transform 0.2s;
}

.book-card:hover {
    transform: translateY(-4px);
}

.book-cover-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 3 / 4;
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow);
    background: var(--bg-primary);
}

.book-cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.book-card:hover .book-cover-img {
    transform: scale(1.05);
}

.book-finished-badge {
    position: absolute;
    top: 6px;
    right: 6px;
    background: #4caf50;
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.book-top-badge {
    position: absolute;
    top: 6px;
    left: 6px;
    background: rgba(255, 215, 0, 0.9);
    color: #5d4037;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.book-title {
    font-size: 13px;
    font-weight: 500;
    margin-top: 8px;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.book-author {
    font-size: 11px;
    color: var(--text-light);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ===== 分页 ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 32px;
}

.page-btn {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.page-btn:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
}

.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.page-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.page-info {
    font-size: 13px;
    color: var(--text-light);
    margin: 0 8px;
}

/* ===== 笔记区 ===== */
.notes-section {
    padding: 60px 0;
    background: rgba(193, 123, 74, 0.04);
}

.notes-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.note-stat {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.note-stat-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--accent-dark);
}

.note-stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.notebooks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.notebook-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 16px;
    display: flex;
    gap: 14px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.notebook-cover {
    width: 60px;
    height: 80px;
    border-radius: 6px;
    object-fit: cover;
    flex-shrink: 0;
    box-shadow: var(--shadow);
}

.notebook-info {
    flex: 1;
    min-width: 0;
}

.notebook-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.notebook-author {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.notebook-stats {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.notebook-stat-item {
    font-size: 12px;
    color: var(--text-secondary);
}

.notebook-stat-item strong {
    color: var(--accent-dark);
}

.notebook-progress {
    margin-top: 8px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.notebook-progress-bar {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.3s;
}

/* ===== 页脚 ===== */
.footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-light);
    font-size: 13px;
    border-top: 1px solid var(--border);
    background: var(--bg-card);
}

.footer-hint {
    margin-top: 8px;
    font-size: 12px;
    opacity: 0.7;
}

/* ===== 加载动画 ===== */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 60px 0;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== 推荐发现区 ===== */
.discover-section {
    padding: 60px 0;
}

.discover-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 24px;
}

.discover-tab {
    padding: 8px 24px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.discover-tab.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.discover-controls {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 24px;
}

.btn-primary {
    padding: 8px 20px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--accent);
    color: #fff;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: var(--accent-dark);
}

.btn-secondary {
    padding: 8px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.search-box {
    display: flex;
    gap: 12px;
    max-width: 500px;
    margin: 0 auto 24px;
}

.search-input {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    background: var(--bg-card);
    color: var(--text-primary);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(193, 123, 74, 0.15);
}

.discover-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.discover-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

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

.discover-cover {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background: var(--bg-primary);
}

.discover-info {
    padding: 14px 16px;
}

.discover-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.discover-author {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 6px;
}

.discover-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.discover-rating {
    font-size: 13px;
    color: #e65100;
    font-weight: 600;
}

.discover-rating-label {
    font-size: 11px;
    padding: 2px 6px;
    border-radius: 4px;
    background: #fff3e0;
    color: #e65100;
}

.discover-reading-count {
    font-size: 11px;
    color: var(--text-light);
}

.discover-reason {
    margin-top: 6px;
    font-size: 12px;
    color: var(--accent);
    background: rgba(193, 123, 74, 0.08);
    padding: 4px 8px;
    border-radius: 4px;
}

.discover-category {
    font-size: 11px;
    color: var(--text-light);
    margin-top: 4px;
}

/* ===== 弹窗通用 ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: flex-start;
    padding: 40px 20px;
    overflow-y: auto;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius);
    max-width: 700px;
    width: 100%;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    margin-bottom: 40px;
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 28px;
    color: var(--text-light);
    cursor: pointer;
    z-index: 10;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 32px;
}

/* ===== 书籍详情弹窗 ===== */
.book-detail-modal .detail-header {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
}

.book-detail-modal .detail-cover {
    width: 120px;
    height: 160px;
    border-radius: 8px;
    object-fit: cover;
    box-shadow: var(--shadow);
    flex-shrink: 0;
}

.book-detail-modal .detail-meta {
    flex: 1;
}

.book-detail-modal .detail-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.book-detail-modal .detail-author {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.book-detail-modal .detail-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.book-detail-modal .detail-tag {
    font-size: 12px;
    padding: 2px 10px;
    border-radius: 10px;
    background: rgba(193, 123, 74, 0.1);
    color: var(--accent-dark);
}

.book-detail-modal .detail-progress-info {
    margin-top: 12px;
    padding: 12px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
}

.book-detail-modal .detail-progress-bar {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 8px;
}

.book-detail-modal .detail-progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 0.3s;
}

.book-detail-modal .detail-intro {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.book-detail-modal .detail-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 16px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.book-detail-modal .detail-info-item {
    font-size: 13px;
    color: var(--text-secondary);
}

.book-detail-modal .detail-info-item strong {
    color: var(--text-primary);
}

.book-detail-modal .detail-actions {
    margin-top: 20px;
    display: flex;
    gap: 12px;
}

/* ===== 笔记详情弹窗 ===== */
.notes-detail-modal {
    max-width: 800px;
}

.notes-detail-modal .notes-header {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.notes-detail-modal .notes-cover {
    width: 60px;
    height: 80px;
    border-radius: 6px;
    object-fit: cover;
    flex-shrink: 0;
    box-shadow: var(--shadow);
}

.notes-detail-modal .notes-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.notes-detail-modal .notes-author {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 4px;
}

.notes-detail-modal .notes-counts {
    display: flex;
    gap: 16px;
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.notes-detail-modal .notes-counts strong {
    color: var(--accent-dark);
}

.notes-detail-modal .notes-section-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 20px 0 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.notes-detail-modal .chapter-group {
    margin-bottom: 20px;
}

.notes-detail-modal .chapter-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-dark);
    margin-bottom: 8px;
    padding: 4px 0;
    border-left: 3px solid var(--accent);
    padding-left: 10px;
}

.notes-detail-modal .highlight-item {
    padding: 10px 14px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-primary);
    line-height: 1.7;
    border-left: 3px solid var(--accent-light);
}

.notes-detail-modal .highlight-date {
    font-size: 11px;
    color: var(--text-light);
    margin-top: 4px;
}

.notes-detail-modal .review-item {
    padding: 10px 14px;
    background: #fff8e1;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-primary);
    line-height: 1.7;
    border-left: 3px solid #ffc107;
}

.notes-detail-modal .review-meta {
    font-size: 11px;
    color: var(--text-light);
    margin-top: 4px;
}

.notes-detail-modal .review-star {
    color: #ff9800;
}

.notes-detail-modal .empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
    font-size: 14px;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hero-title {
        font-size: 24px;
    }
    .hero-stats {
        gap: 24px;
    }
    .hero-stat-value {
        font-size: 32px;
    }
    .charts-grid {
        grid-template-columns: 1fr;
    }
    .chart-card.large {
        grid-column: auto;
    }
    .book-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 12px;
    }
    .top-books-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }
}