/* main.css - 主样式文件 */

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础变量 */
:root {
    /* 颜色 - 苹果风格 */
    --primary-color: #0071e3;
    --primary-hover: #0077ed;
    --secondary-color: #86868b;
    --text-color: #1d1d1f;
    --light-text: #86868b;
    --background-color: #ffffff;
    --section-bg: #f5f5f7;
    --border-color: #d2d2d7;
    --overlay-color: rgba(0, 0, 0, 0.7);
    --success-color: #28cd41;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* 边框圆角 */
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 18px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
    
    /* 过渡效果 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 基础标签样式 */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-hover);
}

img {
    max-width: 100%;
    height: auto;
}

button {
    cursor: pointer;
    font-family: inherit;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 布局样式 */
.header {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    color: var(--text-color);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.main-container {
    position: relative;
    min-height: 70vh;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

/* iframe嵌入区域样式 */
.iframe-container {
    width: 100%;
    height: 600px;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    background-color: white;
    box-shadow: var(--shadow-md);
    position: relative;
    margin: var(--spacing-md) 0;
}

.iframe-container iframe {
    width: 100%;
    height: 100%;
    border: none;
    position: relative;
    z-index: 1;
}

.iframe-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 0;
}

.iframe-error {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: var(--section-bg);
    z-index: 2;
    padding: var(--spacing-lg);
    text-align: center;
}

.iframe-error h3 {
    margin-bottom: var(--spacing-md);
    color: #ff3b30;
}

.iframe-error button {
    margin-top: var(--spacing-md);
}

.editor-section {
    padding: var(--spacing-lg) 0;
}

.editor-container {
    text-align: center;
    position: relative;
}

.editor-description {
    max-width: 600px;
    margin: 0 auto var(--spacing-md);
    color: var(--light-text);
}

/* 提示卡片区域样式 */
.tips-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--section-bg);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.tip-card {
    background-color: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    text-align: center;
}

.tip-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.tip-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 113, 227, 0.1);
    border-radius: 50%;
}

.tip-icon img, 
.tip-icon svg {
    width: 30px;
    height: 30px;
}

.tip-card h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 1.2rem;
}

.tip-card p {
    color: var(--light-text);
    font-size: 0.95rem;
    margin: 0;
}

/* 上传区域样式 */
.upload-section {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 60vh;
    min-height: 400px;
}

.upload-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 600px;
    padding: var(--spacing-xl);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    background-color: var(--section-bg);
    transition: all var(--transition-normal);
    text-align: center;
}

.upload-container.drag-over {
    border-color: var(--primary-color);
    background-color: rgba(0, 113, 227, 0.05);
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-md);
    opacity: 0.7;
}

.upload-container h2 {
    margin-bottom: var(--spacing-sm);
}

.upload-container p {
    color: var(--light-text);
    margin-bottom: var(--spacing-md);
}

/* 编辑区域样式 */
.editor-section {
    padding: var(--spacing-md) 0;
}

.editor-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.toolbar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background-color: var(--section-bg);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.tool-group {
    display: flex;
    gap: var(--spacing-xs);
}

.tool-button {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 1px solid transparent;
    background-color: transparent;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all var(--transition-fast);
}

.tool-button img {
    width: 24px;
    height: 24px;
}

.tool-button:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.tool-button.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.tool-button.active img {
    filter: brightness(10);
}

.size-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.size-label {
    color: var(--light-text);
    font-weight: 500;
}

input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
}

.size-value {
    min-width: 40px;
    text-align: right;
    font-weight: 500;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.canvas-container {
    width: 100%;
    height: 60vh;
    min-height: 400px;
    background-color: var(--section-bg);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-md);
}

.canvas-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

#drawing-canvas {
    z-index: 2;
}

#image-canvas {
    z-index: 1;
    background-color: white;
}

/* 结果区域样式 */
.result-section {
    padding: var(--spacing-md) 0;
}

.result-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.result-comparison {
    display: flex;
    width: 100%;
    gap: var(--spacing-md);
}

.original-image,
.processed-image {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.image-wrapper {
    width: 100%;
    height: 350px;
    background-color: var(--section-bg);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-wrapper img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

/* 加载动画样式 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--overlay-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 200;
}

.loader {
    width: 60px;
    height: 60px;
    border: 5px solid rgba(0, 113, 227, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: var(--spacing-md);
}

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

.loading-overlay p {
    color: white;
    font-size: 1.2rem;
}

/* 如何工作区域样式 */
.how-it-works {
    background-color: var(--section-bg);
    padding: var(--spacing-xl) var(--spacing-md);
}

.section-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.steps-container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.step {
    flex: 1;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.step-icon {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 113, 227, 0.1);
    border-radius: 50%;
}

.step-icon img {
    width: 40px;
    height: 40px;
}

/* 关于区域样式 */
.about {
    padding: var(--spacing-xl) var(--spacing-md);
}

.about p {
    max-width: 800px;
    margin: var(--spacing-md) auto;
    text-align: center;
    color: var(--light-text);
    font-size: 1.1rem;
    line-height: 1.6;
}

.attribution {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--light-text);
}

/* 页脚样式 */
.footer {
    background-color: var(--section-bg);
    padding: var(--spacing-md) var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer p {
    color: var(--light-text);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--light-text);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .iframe-container {
        height: 500px;
    }
    
    .steps-container {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-menu ul {
        gap: var(--spacing-sm);
    }
    
    .iframe-container {
        height: 400px;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
}