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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #f0f2f5, #e0e4e9);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 页头部分 */
header {
    text-align: center;
    padding: 40px 0 20px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
}

.logo i {
    font-size: 36px;
    color: #1a73e8;
    margin-right: 15px;
}

h1 {
    color: #1a73e8;
    font-size: 32px;
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.subtitle {
    color: #5f6368;
    font-size: 18px;
    margin-bottom: 20px;
}

/* 上传容器 */
.upload-container {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    transition: all 0.3s;
    margin: 20px 0 40px;
    flex: 1;
}

.upload-container:hover {
    box-shadow: 0 12px 40px rgba(0,0,0,0.2);
}

/* 上传区域 */
.upload-box {
    border: 2px dashed #1a73e8;
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    background: rgba(248, 249, 255, 0.8);
    margin-bottom: 25px;
}

.upload-box:hover {
    transform: translateY(-5px);
    background: #f0f7ff;
}

.upload-box.dragover {
    background: #e8f0fe;
    border-color: #1557b0;
    transform: scale(1.03);
    box-shadow: 0 10px 25px rgba(26, 115, 232, 0.2);
}

.upload-icon {
    margin-bottom: 15px;
}

.upload-icon i {
    font-size: 60px;
    color: #1a73e8;
    opacity: 0.8;
    transition: all 0.3s;
}

.upload-box:hover .upload-icon i {
    opacity: 1;
    transform: scale(1.1);
}

#fileInput {
    display: none;
}

.upload-info span {
    color: #1a73e8;
    font-weight: 600;
    font-size: 20px;
    display: block;
    margin-bottom: 10px;
}

.upload-info p {
    color: #5f6368;
}

/* 上传按钮 */
#uploadBtn {
    display: block;
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #1a73e8, #1557b0);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

#uploadBtn i {
    margin-right: 10px;
}

#uploadBtn:hover {
    background: linear-gradient(135deg, #1557b0, #1a73e8);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(26, 115, 232, 0.4);
}

#uploadBtn:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px rgba(26, 115, 232, 0.4);
}

/* 结果区域 */
.result-container {
    margin-top: 30px;
    transition: all 0.3s;
}

/* 加载动画 */
.loading-spinner {
    font-size: 40px;
    color: #1a73e8;
    display: block;
    text-align: center;
    margin: 30px auto;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 成功消息 */
.success-box {
    background: #e8f6ec;
    border: 1px solid #34a853;
    border-radius: 12px;
    padding: 25px;
    animation: fadeIn 0.5s ease-out;
    box-shadow: 0 5px 15px rgba(52, 168, 83, 0.15);
}

.success-box h3 {
    color: #34a853;
    font-size: 20px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.success-box h3:before {
    content: '✅';
    margin-right: 10px;
    font-size: 24px;
}

/* 缩略图 */
.thumbnail {
    display: flex;
    justify-content: center;
    margin: 20px 0;
}

.thumbnail img {
    max-width: 300px;
    max-height: 200px;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: all 0.3s;
    border: 2px solid white;
}

.thumbnail img:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* URL 框 */
.url-box {
    margin-top: 20px;
    background: rgba(255, 255, 255, 0.8);
    padding: 15px;
    border-radius: 8px;
}

.url-box label {
    display: block;
    color: #5f6368;
    margin: 10px 0 5px;
    font-weight: 500;
}

.url-box span {
    display: block;
    padding: 8px 0;
    color: #1a73e8;
    font-weight: 500;
}

.url-box input {
    width: calc(100% - 100px);
    padding: 12px;
    border: 1px solid #dadce0;
    border-radius: 6px;
    font-size: 14px;
    transition: all 0.3s;
}

.url-box input:focus {
    border-color: #1a73e8;
    outline: none;
    box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
}

.url-box button {
    padding: 10px 20px;
    margin-left: 10px;
    background: #1a73e8;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

.url-box button:hover {
    background: #1557b0;
    transform: translateY(-2px);
}

/* 错误消息 */
.error-box {
    background: #fce8e6;
    border: 1px solid #d93025;
    border-radius: 12px;
    padding: 25px;
    animation: fadeIn 0.5s ease-out;
    box-shadow: 0 5px 15px rgba(217, 48, 37, 0.15);
}

.error-box h3 {
    color: #d93025;
    font-size: 20px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.error-box h3:before {
    content: '❌';
    margin-right: 10px;
    font-size: 24px;
}

.error-box p {
    color: #5f6368;
    line-height: 1.6;
}

/* 页脚 */
footer {
    text-align: center;
    padding: 20px 0;
    color: #5f6368;
    font-size: 14px;
}

footer a {
    color: #1a73e8;
    text-decoration: none;
    transition: color 0.3s;
}

footer a:hover {
    color: #1557b0;
    text-decoration: underline;
}

/* 动画 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    h1 {
        font-size: 24px;
    }
    
    .subtitle {
        font-size: 16px;
    }
    
    .upload-box {
        padding: 25px;
    }
    
    .upload-icon i {
        font-size: 40px;
    }
    
    .upload-info span {
        font-size: 18px;
    }
    
    #uploadBtn {
        font-size: 16px;
        padding: 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    header {
        padding: 20px 0 10px;
    }
    
    .logo i {
        font-size: 24px;
    }
    
    h1 {
        font-size: 20px;
    }
    
    .upload-container {
        padding: 20px;
        margin: 10px 0 20px;
    }
    
    .upload-box {
        padding: 20px;
    }
    
    .upload-icon i {
        font-size: 32px;
    }
    
    .upload-info span {
        font-size: 16px;
    }
    
    .url-box input {
        width: 100%;
        margin-bottom: 10px;
    }
    
    .url-box button {
        display: block;
        width: 100%;
        margin-left: 0;
    }
}