/**
 * LoadingHelper CSS - 全局加载动画样式
 * 
 * 提供统一的加载动画样式
 * 包括Spinner、Overlay、Button Loading、Progress等组件
 * 
 * @version 1.0.0
 */

/* ========================================
   CSS变量定义
======================================== */

:root {
    --loading-spinner-color: var(--primary, #4F46E5);
    --loading-overlay-bg: rgba(0, 0, 0, 0.5);
    --loading-text-color: #666;
    --loading-spinner-size: 40px;
    --loading-spinner-border: 4px;
    --loading-transition: all 0.3s ease;
}

/* ========================================
   Spinner动画
======================================== */

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
}

@keyframes pulse {
    0% {
        transform: scale(0.8);
        opacity: 0.5;
    }

    50% {
        transform: scale(1.2);
        opacity: 1;
    }

    100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
}

@keyframes dots {

    0%,
    20% {
        content: ".";
    }

    40% {
        content: "..";
    }

    60%,
    100% {
        content: "...";
    }
}

/* ========================================
   Spinner组件 (默认圆圈)
======================================== */

.loading-spinner {
    width: var(--loading-spinner-size);
    height: var(--loading-spinner-size);
    border: var(--loading-spinner-border) solid var(--primary-container);
    border-top-color: var(--loading-spinner-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    /* 硬件加速 */
    transform: translateZ(0);
    will-change: transform;
}

/* ========================================
   Spinner变体支持 (后台配置)
======================================== */

/* 1. 圆圈 loading (circle - 前面已作为默认样式) */
.loading-spinner.spinner-circle {
    /* 继承默认样式 */
}

/* 2. 脉冲 loading (pulse) */
.loading-spinner.spinner-pulse {
    border: none;
    background-color: var(--loading-spinner-color);
    border-radius: 50%;
    animation: pulse 1s ease-in-out infinite;
    transform: translateZ(0);
}

/* 3. 点状 loading (dots) */
.loading-spinner.spinner-dots {
    border: none;
    background: transparent;
    border-radius: 0;
    animation: none;
    position: relative;
    width: auto;
}

.loading-spinner.spinner-dots::after {
    content: "...";
    animation: dots 1.5s infinite steps(1);
    font-size: 24px;
    font-weight: bold;
    color: var(--loading-spinner-color);
}

.loading-spinner.small.spinner-dots::after {
    font-size: 14px;
}

.loading-spinner.small {
    --loading-spinner-size: 20px;
    --loading-spinner-border: 2px;
}

.loading-spinner.large {
    --loading-spinner-size: 60px;
    --loading-spinner-border: 6px;
}

/* ========================================
   全屏Overlay组件
======================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--loading-overlay-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
    /* 硬件加速 */
    transform: translateZ(0);
    will-change: opacity;
}

.loading-overlay.show {
    opacity: 1;
}

.loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    background: white;
    padding: 32px 48px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: fadeIn 0.3s ease;
}

.loading-message {
    color: var(--loading-text-color);
    font-size: 16px;
    font-weight: 500;
    text-align: center;
    max-width: 300px;
}

/* ========================================
   按钮加载状态
======================================== */

.btn.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.8;
}

.btn-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
    /* 硬件加速 */
    transform: translateZ(0);
    will-change: transform;
}

.btn-text {
    vertical-align: middle;
}

/* 不同按钮类型的spinner颜色 */
.btn-outline.loading .btn-spinner {
    border-color: var(--primary-container);
    border-top-color: var(--primary);
}

.btn-secondary.loading .btn-spinner {
    border-color: rgba(255, 255, 255, 0.3);
    border-top-color: white;
}

/* ========================================
   区域加载组件
======================================== */

.loading-inline {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 24px;
    color: var(--loading-text-color);
    animation: fadeIn 0.3s ease;
}

.loading-text {
    font-size: 14px;
    color: var(--loading-text-color);
}

.loading-container {
    position: relative;
    min-height: 100px;
}

/* 表格加载状态 */
table .loading-inline {
    padding: 40px 20px;
}

/* 卡片加载状态 */
.card .loading-inline {
    padding: 60px 20px;
}

/* ========================================
   进度条组件
======================================== */

.loading-progress-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 32px 48px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    min-width: 400px;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.loading-progress-container.show {
    opacity: 1;
}

.progress-message {
    color: var(--loading-text-color);
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 16px;
    text-align: center;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #E5E7EB;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: var(--loading-spinner-color);
    border-radius: 4px;
    transition: width 0.3s ease;
    /* 硬件加速 */
    transform: translateZ(0);
    will-change: width;
}

.progress-text {
    text-align: center;
    color: var(--loading-text-color);
    font-size: 14px;
    font-weight: 600;
}

/* ========================================
   响应式设计
======================================== */

@media (max-width: 768px) {
    .loading-content {
        padding: 24px 32px;
        max-width: 90%;
    }

    .loading-message {
        font-size: 14px;
        max-width: 250px;
    }

    .loading-progress-container {
        min-width: 90%;
        padding: 24px 32px;
    }

    .loading-spinner {
        --loading-spinner-size: 32px;
        --loading-spinner-border: 3px;
    }
}

/* ========================================
   暗色主题支持
======================================== */

@media (prefers-color-scheme: dark) {
    :root {
        --loading-text-color: #9CA3AF;
        --loading-overlay-bg: rgba(0, 0, 0, 0.7);
    }

    .loading-content,
    .loading-progress-container {
        background: #1F2937;
        color: #F3F4F6;
    }

    .loading-message,
    .progress-message,
    .progress-text,
    .loading-text {
        color: #F3F4F6;
    }

    .progress-bar {
        background: #374151;
    }
}

/* ========================================
   打印样式
======================================== */

@media print {

    .loading-overlay,
    .loading-progress-container {
        display: none !important;
    }
}

/* ========================================
   无障碍增强
======================================== */

/* 减少动画 */
@media (prefers-reduced-motion: reduce) {

    .loading-spinner,
    .btn-spinner {
        animation: none;
        border-top-color: var(--loading-spinner-color);
        border-right-color: var(--loading-spinner-color);
    }

    .loading-overlay,
    .loading-progress-container,
    .loading-inline {
        animation: none;
        transition: none;
    }

    .progress-fill {
        transition: none;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    .loading-spinner {
        border-width: calc(var(--loading-spinner-border) + 1px);
    }

    .loading-content,
    .loading-progress-container {
        border: 2px solid currentColor;
    }
}

/* ========================================
   工具类
======================================== */

/* 隐藏加载状态 */
.loading-hidden {
    display: none !important;
}

/* 加载时禁用交互 */
.loading-disabled {
    pointer-events: none;
    opacity: 0.6;
}

/* 加载时的光标 */
.loading-cursor {
    cursor: wait !important;
}

/* ========================================
   动画性能优化
======================================== */

/* 使用GPU加速 */
.loading-spinner,
.btn-spinner,
.loading-overlay,
.progress-fill {
    backface-visibility: hidden;
    perspective: 1000px;
}

/* 优化重绘 */
.loading-overlay,
.loading-progress-container {
    contain: layout style paint;
}