/**
 * DAF学院 - 通用组件库
 * 现代化UI组件系统
 */

/* ========================================
   1. 按钮组件
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 按钮尺寸 */
.btn-xs {
    padding: 2px var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* 主要按钮 */
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, #667eea 100%);
    color: white;
    border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, #5a67d8 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.3);
    /* color: wheat; */
}

/* 次要按钮 */
.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-secondary);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* 成功按钮 */
.btn-success {
    background: linear-gradient(135deg, var(--color-success) 0%, #38a169 100%);
    color: white;
    border-color: var(--color-success);
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, #2f855a 0%, #276749 100%);
}

/* 危险按钮 */
.btn-danger {
    background: linear-gradient(135deg, var(--color-danger) 0%, #e53e3e 100%);
    color: white;
    border-color: var(--color-danger);
}

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, #c53030 0%, #9b2c2c 100%);
}

/* 警告按钮 */
.btn-warning {
    background: linear-gradient(135deg, var(--color-warning) 0%, #ed8936 100%);
    color: white;
    border-color: var(--color-warning);
}

/* 强调色按钮 */
.btn-accent {
    background: linear-gradient(135deg, var(--color-accent) 0%, #ffb347 100%);
    color: #8b4513;
    border-color: var(--color-accent);
}

/* 轮廓按钮 */
.btn-outline-primary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline-primary:hover:not(:disabled) {
    background: var(--color-primary);
    color: white;
}

/* 文字按钮 */
.btn-text {
    background: transparent;
    color: var(--color-primary);
    border-color: transparent;
    padding: var(--spacing-xs) var(--spacing-sm);
}

.btn-text:hover:not(:disabled) {
    background: var(--color-primary-50);
}

/* 图标按钮 */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--border-radius);
}

.btn-icon.round {
    border-radius: var(--border-radius-full);
}

/* ========================================
   2. 卡片组件
======================================== */
.card {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color-light);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color-light);
    background: var(--bg-tertiary);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color-light);
    background: var(--bg-tertiary);
}

/* 可点击卡片 */
.card-clickable {
    cursor: pointer;
}

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

/* 高亮卡片 */
.card-highlight {
    border-color: var(--color-primary);
    border-width: 2px;
}

/* ========================================
   3. 表单组件
======================================== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

.form-label.required::after {
    content: '*';
    color: var(--color-danger);
    margin-left: 4px;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-50);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-tertiary);
}

.form-input.error,
.form-textarea.error,
.form-select.error {
    border-color: var(--color-danger);
}

.form-input.success,
.form-textarea.success {
    border-color: var(--color-success);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-hint {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

.form-error {
    font-size: var(--font-size-xs);
    color: var(--color-danger);
    margin-top: var(--spacing-xs);
}

/* 复选框和单选框 */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.form-check-input {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.form-check-label {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    cursor: pointer;
}

/* 开关 */
.form-switch {
    position: relative;
    width: 44px;
    height: 24px;
}

.form-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.form-switch-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: var(--transition-fast);
    border-radius: 24px;
}

.form-switch-slider::before {
    position: absolute;
    content: '';
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: var(--transition-fast);
    border-radius: 50%;
}

.form-switch input:checked + .form-switch-slider {
    background-color: var(--color-primary);
}

.form-switch input:checked + .form-switch-slider::before {
    transform: translateX(20px);
}

/* ========================================
   4. 徽章组件
======================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: 11px;
    font-weight: var(--font-weight-medium);
    line-height: 1.4;
    border-radius: var(--border-radius);
    white-space: nowrap;
}

.badge-primary {
    background: linear-gradient(135deg, #ffd700 0%, #ffb347 50%, #ff8c00 100%);
    background-size: 200% 200%;
    color: #8b4513;
    font-weight: var(--font-weight-bold);
    border: 1px solid rgba(255, 215, 0, 0.5);
    box-shadow: 
        0 2px 8px rgba(255, 215, 0, 0.4),
        0 0 12px rgba(255, 215, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
    animation: badgePrimaryGlow 2s ease-in-out infinite, badgePrimaryShine 3s linear infinite;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.badge-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: badgeShine 3s ease-in-out infinite;
}

.badge-primary:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 
        0 4px 16px rgba(255, 215, 0, 0.6),
        0 0 20px rgba(255, 215, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.badge-secondary {
    background: linear-gradient(135deg, #4a90e2 0%, #5ba3f5 50%, #6bb6ff 100%);
    background-size: 200% 200%;
    color: #ffffff;
    font-weight: var(--font-weight-bold);
    border: 1px solid rgba(74, 144, 226, 0.6);
    box-shadow: 
        0 2px 8px rgba(74, 144, 226, 0.4),
        0 0 12px rgba(74, 144, 226, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
    animation: badgeSecondaryGlow 2s ease-in-out infinite, badgeSecondaryShine 3s linear infinite;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.badge-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: badgeShine 3s ease-in-out infinite;
}

.badge-secondary:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 
        0 4px 16px rgba(74, 144, 226, 0.6),
        0 0 20px rgba(74, 144, 226, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

/* 院长标签动画 */
@keyframes badgePrimaryGlow {
    0%, 100% {
        box-shadow: 
            0 2px 8px rgba(255, 215, 0, 0.4),
            0 0 12px rgba(255, 215, 0, 0.3),
            inset 0 1px 0 rgba(255, 255, 255, 0.3);
        background-position: 0% 50%;
    }
    50% {
        box-shadow: 
            0 4px 16px rgba(255, 215, 0, 0.6),
            0 0 20px rgba(255, 215, 0, 0.5),
            inset 0 1px 0 rgba(255, 255, 255, 0.4);
        background-position: 100% 50%;
    }
}

@keyframes badgePrimaryShine {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 管理员标签动画 */
@keyframes badgeSecondaryGlow {
    0%, 100% {
        box-shadow: 
            0 2px 8px rgba(74, 144, 226, 0.4),
            0 0 12px rgba(74, 144, 226, 0.3),
            inset 0 1px 0 rgba(255, 255, 255, 0.3);
        background-position: 0% 50%;
    }
    50% {
        box-shadow: 
            0 4px 16px rgba(74, 144, 226, 0.6),
            0 0 20px rgba(74, 144, 226, 0.5),
            inset 0 1px 0 rgba(255, 255, 255, 0.4);
        background-position: 100% 50%;
    }
}

@keyframes badgeSecondaryShine {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 通用闪光动画 */
@keyframes badgeShine {
    0% {
        left: -100%;
    }
    50%, 100% {
        left: 100%;
    }
}

/* 暗色主题适配 */
[data-theme="dark"] .badge-primary {
    background: linear-gradient(135deg, #ffd700 0%, #ffb347 50%, #ff8c00 100%);
    color: #5a3a1a;
    box-shadow: 
        0 2px 8px rgba(255, 215, 0, 0.5),
        0 0 15px rgba(255, 215, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .badge-primary:hover {
    box-shadow: 
        0 4px 16px rgba(255, 215, 0, 0.7),
        0 0 25px rgba(255, 215, 0, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

[data-theme="dark"] .badge-secondary {
    background: linear-gradient(135deg, #5ba3f5 0%, #6bb6ff 50%, #7bc9ff 100%);
    color: #ffffff;
    box-shadow: 
        0 2px 8px rgba(74, 144, 226, 0.5),
        0 0 15px rgba(74, 144, 226, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .badge-secondary:hover {
    box-shadow: 
        0 4px 16px rgba(74, 144, 226, 0.7),
        0 0 25px rgba(74, 144, 226, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.badge-success {
    background: rgba(72, 187, 120, 0.15);
    color: var(--color-success);
}

.badge-danger {
    background: rgba(245, 101, 101, 0.15);
    color: var(--color-danger);
}

.badge-warning {
    background: rgba(237, 137, 54, 0.15);
    color: var(--color-warning);
}

.badge-info {
    background: rgba(66, 153, 225, 0.15);
    color: var(--color-info);
}

.badge-accent {
    background: rgba(245, 166, 35, 0.2);
    color: #8b4513;
}

/* 圆形徽章 */
.badge-dot {
    width: 8px;
    height: 8px;
    padding: 0;
    border-radius: 50%;
}

/* 计数徽章 */
.badge-count {
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: 9px;
    font-size: 10px;
}

/* ========================================
   5. 标签组件
======================================== */
.tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: var(--font-size-xs);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--border-radius-full);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--color-primary-50);
    color: var(--color-primary);
}

.tag-primary {
    background: var(--color-primary-50);
    color: var(--color-primary);
}

.tag-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 14px;
    height: 14px;
    font-size: 10px;
    cursor: pointer;
    border-radius: 50%;
    transition: background var(--transition-fast);
}

.tag-close:hover {
    background: rgba(0, 0, 0, 0.1);
}

/* ========================================
   6. 头像组件
======================================== */
.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-full);
    overflow: hidden;
    background: var(--bg-tertiary);
    flex-shrink: 0;
}

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

.avatar-xs { width: 24px; height: 24px; }
.avatar-sm { width: 32px; height: 32px; }
.avatar-md { width: 40px; height: 40px; }
.avatar-lg { width: 48px; height: 48px; }
.avatar-xl { width: 64px; height: 64px; }
.avatar-2xl { width: 80px; height: 80px; }

.avatar-square {
    border-radius: var(--border-radius);
}

/* 头像组 */
.avatar-group {
    display: flex;
}

.avatar-group .avatar {
    border: 2px solid var(--bg-card);
    margin-left: -8px;
}

.avatar-group .avatar:first-child {
    margin-left: 0;
}

/* ========================================
   7. 进度条组件
======================================== */
.progress {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), #667eea);
    border-radius: var(--border-radius-full);
    transition: width var(--transition-normal);
}

.progress-bar.success {
    background: linear-gradient(90deg, var(--color-success), #38a169);
}

.progress-bar.warning {
    background: linear-gradient(90deg, var(--color-warning), #ed8936);
}

.progress-bar.danger {
    background: linear-gradient(90deg, var(--color-danger), #e53e3e);
}

/* 带文字的进度条 */
.progress-lg {
    height: 20px;
}

.progress-lg .progress-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: white;
    font-weight: 500;
}

/* ========================================
   8. 提示组件
======================================== */
.alert {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
}

.alert-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
}

.alert-content {
    flex: 1;
}

.alert-title {
    font-weight: var(--font-weight-semibold);
    margin-bottom: 4px;
}

.alert-info {
    background: rgba(66, 153, 225, 0.1);
    border-left: 3px solid var(--color-info);
    color: #2b6cb0;
}

.alert-success {
    background: rgba(72, 187, 120, 0.1);
    border-left: 3px solid var(--color-success);
    color: #276749;
}

.alert-warning {
    background: rgba(237, 137, 54, 0.1);
    border-left: 3px solid var(--color-warning);
    color: #c05621;
}

.alert-danger {
    background: rgba(245, 101, 101, 0.1);
    border-left: 3px solid var(--color-danger);
    color: #c53030;
}

/* ========================================
   9. 弹窗/模态框组件
======================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

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

.modal {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    transform: translateY(-20px);
    transition: transform var(--transition-fast);
}

.modal-overlay.show .modal {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color-light);
}

.modal-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color-light);
}

/* ========================================
   10. Toast 通知组件
======================================== */
.toast-container {
    position: fixed;
    top: calc(var(--header-height) + var(--spacing-md));
    right: var(--spacing-md);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 280px;
    max-width: 400px;
    animation: toastSlideIn 0.3s ease;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.toast-close {
    padding: 4px;
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
}

.toast-success {
    border-left: 3px solid var(--color-success);
}

.toast-error {
    border-left: 3px solid var(--color-danger);
}

.toast-warning {
    border-left: 3px solid var(--color-warning);
}

.toast-info {
    border-left: 3px solid var(--color-info);
}

/* ========================================
   11. 分页组件
======================================== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.pagination-item {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.pagination-item:hover:not(.disabled):not(.active) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.pagination-item.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.pagination-item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========================================
   12. 标签页组件
======================================== */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color-light);
    overflow-x: auto;
}

.tab-item {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    white-space: nowrap;
    cursor: pointer;
}

.tab-item:hover {
    color: var(--color-primary);
}

.tab-item.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.tab-content {
    padding: var(--spacing-lg) 0;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* ========================================
   13. 下拉菜单组件
======================================== */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: var(--bg-card);
    border: 1px solid var(--border-color-light);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-dropdown);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
}

.dropdown.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(4px);
}

.dropdown-menu-right {
    left: auto;
    right: 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    text-decoration: none;
    transition: background var(--transition-fast);
    cursor: pointer;
}

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

.dropdown-item.danger {
    color: var(--color-danger);
}

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

/* ========================================
   14. 加载组件
======================================== */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.spinner-lg {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

/* ========================================
   15. 空状态组件
======================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
    opacity: 0.3;
}

.empty-state-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.empty-state-desc {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   16. 工具类
======================================== */
/* 文字颜色 */
.text-primary { color: var(--color-primary) !important; }
.text-success { color: var(--color-success) !important; }
.text-danger { color: var(--color-danger) !important; }
.text-warning { color: var(--color-warning) !important; }
.text-muted { color: var(--text-tertiary) !important; }

/* 文字大小 */
.text-xs { font-size: var(--font-size-xs) !important; }
.text-sm { font-size: var(--font-size-sm) !important; }
.text-base { font-size: var(--font-size-base) !important; }
.text-lg { font-size: var(--font-size-lg) !important; }
.text-xl { font-size: var(--font-size-xl) !important; }

/* 文字粗细 */
.font-normal { font-weight: var(--font-weight-normal) !important; }
.font-medium { font-weight: var(--font-weight-medium) !important; }
.font-semibold { font-weight: var(--font-weight-semibold) !important; }
.font-bold { font-weight: var(--font-weight-bold) !important; }

/* 间距 */
.m-0 { margin: 0 !important; }
.mt-auto { margin-top: auto !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }

/* 显示 */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }

/* Flex */
.flex-1 { flex: 1 !important; }
.flex-wrap { flex-wrap: wrap !important; }
.items-center { align-items: center !important; }
.justify-between { justify-content: space-between !important; }
.justify-center { justify-content: center !important; }
.gap-1 { gap: var(--spacing-xs) !important; }
.gap-2 { gap: var(--spacing-sm) !important; }
.gap-3 { gap: var(--spacing-md) !important; }

/* 圆角 */
.rounded { border-radius: var(--border-radius) !important; }
.rounded-lg { border-radius: var(--border-radius-lg) !important; }
.rounded-full { border-radius: var(--border-radius-full) !important; }

/* 阴影 */
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }

/* 截断文字 */
.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}