/* 知识卡片 - 网格视图 */
.knowledge-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.knowledge-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.15s ease;
}

.knowledge-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.knowledge-card.selected {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.05);
}

.knowledge-card-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    word-break: break-all;
    overflow-wrap: break-word;
}

.knowledge-card-excerpt {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-size: 0.85rem;
    word-break: break-all;
    overflow-wrap: break-word;
}

.knowledge-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.knowledge-card-date {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.knowledge-card-category {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
}

/* 知识卡片操作按钮 */
.knowledge-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.25rem;
}

.knowledge-card-actions {
    display: none;
    align-items: center;
    gap: 0.25rem;
    margin-left: 0.5rem;
    flex-shrink: 0;
}

.knowledge-card:hover .knowledge-card-actions {
    display: flex;
}

.action-btn {
    padding: 0.25rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.action-btn.favorite-btn.favorited {
    color: #ef4444;
}

.action-btn.favorite-btn.favorited:hover {
    color: #dc2626;
}

/* 通用弹窗样式 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    transition: all 0.3s ease;
}

.modal-content {
    position: relative;
    background: var(--bg-primary);
    border-radius: 16px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    width: 90%;
    max-width: 520px;
    max-height: 90dvh;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transform: scale(0.95) translateY(-20px);
    transition: all 0.3s ease;
}

.modal.show .modal-content {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    padding: 0.5rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.15s ease;
}

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

.modal-body {
    padding: 2rem;
    max-height: calc(90dvh - 200px);
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border-top: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
}

.form-label-text {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-required {
    color: #ef4444;
    margin-left: 0.25rem;
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.15s ease;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

/* 会员徽章 */
.membership-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.membership-badge.vip {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: #B8860B;
}

.membership-badge.normal {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.crown-icon {
    color: #FFD700;
}

/* 头部用户信息 */
.header-user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: background-color 0.2s;
}

.header-user-info:hover {
    background-color: var(--bg-secondary);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 1rem;
}

.user-details {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.user-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
    line-height: 1;
}

.user-level {
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    line-height: 1;
}

.user-level.vip {
    color: #FFD700;
    font-weight: 500;
}

.user-level.normal {
    color: var(--text-secondary);
}

.user-level .crown-icon {
    color: #FFD700;
}

/* 工具类 */
.hidden {
    display: none !important;
}

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

.mt-4 {
    margin-top: 1rem;
}

.mb-4 {
    margin-bottom: 1rem;
}