/* 通用样式设置 */
:root {
    --primary-color: #007aff;
    --primary-hover: #0062cc;
    --secondary-color: #8e8e93;
    --light-gray: #f2f2f7;
    --medium-gray: #e5e5ea;
    --dark-gray: #8e8e93;
    --text-color: #1d1d1f;
    --background-color: #ffffff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --border-radius: 10px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--background-color);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

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

h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.8rem;
}

h3 {
    font-size: 1.4rem;
}

h4 {
    font-size: 1.2rem;
}

p {
    margin-bottom: 1rem;
}

ul {
    list-style: none;
}

button, .btn {
    cursor: pointer;
    border: none;
    border-radius: var(--border-radius);
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    font-family: inherit;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
}

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

.btn.secondary {
    background-color: var(--light-gray);
    color: var(--text-color);
}

.btn.secondary:hover {
    background-color: var(--medium-gray);
}

section {
    padding: 60px 0;
}

/* 头部样式 */
header {
    background-color: rgba(255, 255, 255, 0.98);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

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

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 30px;
}

nav a {
    color: var(--text-color);
    font-weight: 500;
}

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

/* 英雄区域样式 */
.hero {
    background: linear-gradient(to right, #f2f2f7, #ffffff);
    text-align: center;
    padding: 80px 0;
}

.hero h2 {
    font-size: 2.5rem;
    max-width: 700px;
    margin: 0 auto 1.5rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
    color: var(--secondary-color);
}

/* 上传区域样式 */
.upload-section {
    background-color: white;
    border-radius: var(--border-radius);
    margin-top: -40px;
    position: relative;
    box-shadow: var(--shadow);
}

.upload-container {
    padding: 40px;
    border: 2px dashed var(--medium-gray);
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    margin-bottom: 20px;
}

.upload-container.drag-over {
    border-color: var(--primary-color);
    background-color: rgba(0, 122, 255, 0.05);
}

.upload-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.upload-hint {
    color: var(--dark-gray);
    font-size: 0.9rem;
    margin-top: 15px;
}

.upload-preview {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.upload-item {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    position: relative;
}

.upload-item img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    display: block;
}

.upload-item-actions {
    position: absolute;
    top: 5px;
    right: 5px;
}

.upload-item-actions button {
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.upload-item-actions button:hover {
    background: rgba(255, 0, 0, 0.8);
}

/* 水印设置面板样式 */
.watermark-panel {
    background-color: var(--light-gray);
    padding: 40px 0;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.setting-group {
    margin-bottom: 20px;
}

.setting-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.setting-group input[type="text"],
.setting-group input[type="color"],
.setting-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--medium-gray);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
}

.setting-group input[type="range"] {
    width: 100%;
    margin-right: 10px;
}

.density-options {
    display: flex;
    gap: 15px;
}

.density-option {
    display: flex;
    align-items: center;
}

.density-option input[type="radio"] {
    margin-right: 5px;
}

.actions {
    display: flex;
    gap: 10px;
    justify-content: flex-start;
}

/* 预览区域样式 */
.preview-section {
    padding: 60px 0;
}

.preview-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.preview-item {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    background-color: white;
}

.preview-item-header {
    padding: 15px;
    background-color: var(--light-gray);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.preview-images {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
    background-color: var(--medium-gray);
}

.preview-image {
    position: relative;
}

.preview-image img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    display: block;
}

.preview-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 5px 10px;
    font-size: 0.8rem;
    text-align: center;
}

/* 下载区域样式 */
.download-section {
    background-color: var(--light-gray);
    padding: 60px 0;
}

.download-options {
    margin-bottom: 30px;
    display: flex;
    gap: 15px;
}

.watermarked-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.watermarked-item {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    background-color: white;
}

.watermarked-item img {
    width: 100%;
    aspect-ratio: 3/2;
    object-fit: cover;
    display: block;
}

.watermarked-item-footer {
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: white;
}

.watermarked-item-footer .filename {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 180px;
}

/* 如何使用区域样式 */
.how-it-works {
    text-align: center;
    padding: 80px 0;
}

.steps {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    margin-top: 40px;
}

.step {
    flex: 1;
    min-width: 200px;
    max-width: 250px;
    padding: 30px 20px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.step:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.step-icon {
    width: 70px;
    height: 70px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.8rem;
}

/* 常见问题样式 */
.faq {
    background-color: white;
    padding: 80px 0;
}

.faq h2 {
    text-align: center;
    margin-bottom: 40px;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--medium-gray);
}

.faq-item:last-child {
    border-bottom: none;
}

/* 页脚样式 */
footer {
    background-color: #f2f2f7;
    padding: 60px 0 20px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo img {
    height: 40px;
    margin-bottom: 15px;
}

.footer-links h4, 
.footer-contact h4 {
    margin-bottom: 20px;
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--medium-gray);
    color: var(--dark-gray);
}

/* 响应式样式 */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    nav ul {
        justify-content: center;
    }
    
    nav ul li {
        margin: 0 15px;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
    
    .preview-images {
        grid-template-columns: 1fr;
    }
    
    .steps {
        flex-direction: column;
        align-items: center;
    }
    
    .step {
        max-width: 100%;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 30px;
    }
}