/* 思悟数学 - UI组件库 */

/* ==================== 加载动画组件 ==================== */
.loading-spinner {
    display: inline-block;
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-spinner-sm {
    width: 24px;
    height: 24px;
    border-width: 3px;
}

.loading-spinner-lg {
    width: 64px;
    height: 64px;
    border-width: 5px;
}

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-4);
    padding: var(--spacing-12);
}

.loading-text {
    color: var(--color-gray-600);
    font-size: var(--text-base);
    font-weight: 500;
}

/* 脉冲加载动画 */
.loading-dots {
    display: flex;
    gap: var(--spacing-2);
}

.loading-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-primary);
    animation: pulse 1.4s ease-in-out infinite;
}

.loading-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.loading-dot:nth-child(3) {
    animation-delay: 0.4s;
}

/* ==================== Toast通知组件 ==================== */
.toast {
    position: fixed;
    top: var(--spacing-6);
    right: var(--spacing-6);
    min-width: 300px;
    max-width: 500px;
    padding: var(--spacing-4) var(--spacing-6);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    animation: slideInRight 0.3s ease-out;
    z-index: 9999;
    border-left: 4px solid var(--color-primary);
}

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

.toast-error {
    border-left-color: var(--color-error);
}

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

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

.toast-icon {
    font-size: var(--text-2xl);
    flex-shrink: 0;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-1);
}

.toast-message {
    color: var(--color-gray-600);
    font-size: var(--text-sm);
}

.toast-close {
    background: none;
    border: none;
    color: var(--color-gray-400);
    cursor: pointer;
    padding: var(--spacing-1);
    font-size: var(--text-xl);
    transition: color var(--transition-fast);
}

.toast-close:hover {
    color: var(--color-gray-600);
}

/* ==================== 模态框组件 ==================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
    animation: fadeIn 0.2s ease-out;
}

.modal {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    animation: scaleIn 0.3s ease-out;
}

.modal-header {
    padding: var(--spacing-6);
    border-bottom: 1px solid var(--color-gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-gray-900);
}

.modal-close {
    background: none;
    border: none;
    color: var(--color-gray-400);
    cursor: pointer;
    padding: var(--spacing-2);
    font-size: var(--text-2xl);
    line-height: 1;
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
}

.modal-close:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-600);
}

.modal-body {
    padding: var(--spacing-6);
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.modal-footer {
    padding: var(--spacing-6);
    border-top: 1px solid var(--color-gray-200);
    display: flex;
    gap: var(--spacing-3);
    justify-content: flex-end;
}

/* ==================== 徽章组件 ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-primary {
    background: var(--color-primary-100);
    color: var(--color-primary-dark);
}

.badge-success {
    background: #D1FAE5;
    color: #065F46;
}

.badge-warning {
    background: #FEF3C7;
    color: #92400E;
}

.badge-error {
    background: #FEE2E2;
    color: #991B1B;
}

.badge-info {
    background: #DBEAFE;
    color: #1E40AF;
}

/* ==================== 进度条组件 ==================== */
.progress {
    width: 100%;
    height: 8px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

/* ==================== 空状态组件 ==================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-16) var(--spacing-8);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-4);
    opacity: 0.5;
}

.empty-state-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-2);
}

.empty-state-description {
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-6);
}

/* ==================== 功能卡片组件 ==================== */
.feature-card {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary-100);
}

.feature-card-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-3xl);
    margin-bottom: var(--spacing-4);
    background: linear-gradient(135deg, var(--color-primary-50), var(--color-primary-100));
}

.feature-card-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-2);
}

.feature-card-description {
    color: var(--color-gray-600);
    line-height: 1.6;
}