:root {
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 80px;
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    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);
    overflow-x: hidden;
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: var(--transition);
    overflow-y: auto;
    overflow-x: hidden;
}

/* 侧边栏收缩按钮 */
.sidebar-toggle-btn {
    position: fixed;
    left: calc(var(--sidebar-width) - 1px);
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 56px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    z-index: 1001;
    transition: left 0.3s ease, background 0.2s ease;
    opacity: 0.7;
}

.sidebar-toggle-btn:hover {
    background: var(--primary-color);
    color: white;
    opacity: 1;
}

.sidebar-toggle-btn i {
    font-size: 12px;
    transition: transform 0.3s ease;
}

body.sidebar-collapsed .sidebar-toggle-btn {
    left: 0;
}

/* 侧边栏收缩状态 - 完全隐藏 */
.sidebar.collapsed {
    width: 0;
    padding: 0;
    overflow: hidden;
    border-right: none;
}

body.sidebar-collapsed .sidebar-toggle-btn i {
    transform: rotate(180deg);
}

/* 主内容区域适配 */
.main-content {
    transition: margin-left 0.3s ease;
}

body.sidebar-collapsed .main-content {
    margin-left: 0;
}

/* 移动端隐藏收缩按钮 */
@media (max-width: 768px) {
    .sidebar-toggle-btn {
        display: none !important;
    }
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: #475569;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-secondary);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
}

.sidebar-logo img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
}

.brand-info h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.brand-info p {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 0;
}

.sidebar-toggle {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background: var(--primary-color);
    transform: scale(1.05);
}

.sidebar-user {
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(99, 102, 241, 0.05);
    cursor: pointer;
    transition: var(--transition);
}

.sidebar-user:hover {
    background: rgba(99, 102, 241, 0.1);
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff !important;
    font-size: 20px;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.user-details {
    flex: 1;
    overflow: hidden;
}

.user-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-identity {
    font-size: 12px;
    color: var(--text-secondary);
}

.user-menu-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition);
}

.user-menu-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-resources {
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    border-bottom: 1px solid var(--border-color);
}

.resource-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    transition: var(--transition);
    cursor: pointer;
}

.resource-item:hover {
    background: #3d4a5c;
}

.resource-item.expandable {
    position: relative;
}

.expand-icon {
    margin-left: auto;
    font-size: 12px;
    color: var(--text-tertiary);
    transition: var(--transition);
}

.resource-item.expanded .expand-icon {
    transform: rotate(180deg);
}

.resource-detail {
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.resource-detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 8px;
}

.detail-label {
    font-size: 12px;
    color: var(--text-tertiary);
}

.detail-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.resource-item i {
    font-size: 18px;
    color: var(--primary-light);
}

.resource-item .fa-crown {
    color: #fbbf24;
}

.resource-info {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 8px;
    flex: 1;
}

.resource-label {
    font-size: 11px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.resource-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-quick-actions {
    padding: 16px 20px;
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border-color);
}

.quick-action-btn {
    flex: 1;
    padding: 10px 8px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.quick-action-btn.recharge-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.quick-action-btn.recharge-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.quick-action-btn.invite-btn {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.quick-action-btn.invite-btn:hover {
    background: var(--secondary-color);
    color: white;
}

.quick-action-btn.message-btn {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.quick-action-btn.message-btn:hover {
    background: var(--primary-color);
    color: white;
}

.quick-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    background: var(--danger-color);
    color: white;
    border-radius: 9px;
    font-size: 10px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--primary-color);
    transform: scaleY(0);
    transition: var(--transition);
}

.nav-item:hover,
.nav-item.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--text-primary);
}

.nav-item.active::before {
    transform: scaleY(1);
}

.nav-item i {
    font-size: 18px;
    width: 20px;
    text-align: center;
}

.nav-item span:first-of-type {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
}

.nav-badge {
    padding: 2px 8px;
    background: var(--primary-color);
    color: white;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
}

.nav-badge.notification-badge {
    background: var(--danger-color);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.footer-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
    font-size: 14px;
}

.footer-link:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.footer-link.logout-link:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: var(--transition);
}

.content-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 32px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 24px;
    backdrop-filter: blur(10px);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-action-btn {
    padding: 10px 16px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.header-action-btn.api-btn {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.header-action-btn.api-btn:hover {
    background: var(--primary-color);
    color: #ffffff !important;
}

.header-action-btn.recharge-btn {
    background: var(--primary-color);
    color: #ffffff !important;
}

.header-action-btn.recharge-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.header-action-btn.invite-btn {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.header-action-btn.invite-btn:hover {
    background: var(--secondary-color);
    color: white;
}

.header-action-btn.message-btn {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.header-action-btn.message-btn:hover {
    background: var(--primary-color);
    color: #ffffff !important;
}

.header-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    background: var(--danger-color);
    color: white;
    border-radius: 9px;
    font-size: 10px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.content-body {
    padding: 32px;
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 8px 0;
}

.section-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
}

.btn-primary,
.btn-secondary {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.btn-primary {
    background: var(--primary-color);
    color: #ffffff !important;
    box-shadow: var(--shadow-sm);
}

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--bg-card);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-icon.books {
    background: var(--primary-color);
    color: white;
}

.stat-icon.words {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.stat-icon.today {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
}

.stat-icon.chapters {
    background: linear-gradient(135deg, #ec4899 0%, #db2777 100%);
    color: white;
}

.stat-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.books-container,
.characters-container,
.knowledge-container,
.prompts-container,
.community-container,
.messages-container {
    margin-top: 24px;
}

.books-grid,
.characters-grid,
.knowledge-grid,
.prompts-grid,
.community-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
    padding: 20px 0;
}

.empty-state {
    text-align: center;
    padding: 80px 20px;
}

.empty-state i {
    font-size: 64px;
    color: var(--text-tertiary);
    margin-bottom: 24px;
}

.empty-state h3 {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
    color: var(--text-secondary);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-purple);
}

.tool-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 16px;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: white;
}

.tool-card h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.tool-card p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.tool-btn {
    width: 100%;
    padding: 10px 20px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.tool-btn:hover {
    background: var(--primary-color);
    color: #ffffff !important;
}

.user-dropdown {
    position: fixed;
    top: 180px;
    left: 20px;
    width: 240px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    padding: 8px 0;
    z-index: 2000;
    animation: dropdownFadeIn 0.2s ease;
}

@keyframes dropdownFadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-item {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
}

.dropdown-item.danger:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.dropdown-item i {
    width: 18px;
    text-align: center;
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 8px 0;
}

.book-card,
.character-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.book-card:hover,
.character-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-purple);
}

.book-cover {
    height: 140px;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

.book-cover i {
    font-size: 48px;
    color: rgba(255, 255, 255, 0.8);
}

.book-info {
    padding: 14px;
}

.book-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.book-description {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.book-meta {
    display: flex;
    gap: 12px;
    margin-bottom: 6px;
}

.book-meta span {
    font-size: 11px;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.book-updated {
    font-size: 11px;
    color: var(--text-tertiary);
}

.book-actions {
    padding: 10px 14px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 6px;
}

.book-btn {
    flex: 1;
    padding: 6px 10px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    transition: var(--transition);
}

.book-btn:hover {
    background: var(--primary-color);
    color: #ffffff !important;
}

.book-btn.primary {
    background: var(--primary-color);
    color: #ffffff !important;
}

.book-btn.primary:hover {
    opacity: 0.9;
}

.book-btn.danger:hover {
    background: var(--danger-color);
    color: white;
}

.character-avatar {
    height: 160px;
    background: linear-gradient(135deg, #ec4899 0%, #db2777 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.character-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.character-avatar i {
    font-size: 48px;
    color: rgba(255, 255, 255, 0.8);
}

.character-info {
    padding: 20px;
}

.character-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.character-role {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.character-description {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.character-actions {
    padding: 12px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 8px;
}

.char-btn {
    flex: 1;
    padding: 8px 12px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: var(--transition);
}

.char-btn:hover {
    background: var(--primary-color);
    color: #ffffff !important;
}

.char-btn.primary {
    background: var(--primary-color);
    color: #ffffff !important;
}

.char-btn.primary:hover {
    opacity: 0.9;
}

.messages-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }

    .section-title {
        font-size: 28px;
    }

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

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .content-header {
        padding: 16px 20px;
    }

    .content-body {
        padding: 20px;
    }

    .search-container {
        max-width: none;
    }

    .section-title {
        font-size: 24px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .books-grid,
    .characters-grid,
    .knowledge-grid,
    .prompts-grid,
    .tools-grid {
        grid-template-columns: 1fr;
    }
}