/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 */
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    
    /* 背景色 */
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --bg-hover: #f0f0f0;
    
    /* 文字颜色 */
    --text-dark: #2d3748;
    --text-gray: #718096;
    --text-light: #a0aec0;
    
    /* 边框和阴影 */
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    --box-shadow-hover: 0 8px 16px rgba(0, 0, 0, 0.12);
    
    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
    --spacing-xl: 40px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ==================== 顶部导航 ==================== */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-md) 0;
    box-shadow: var(--box-shadow);
    margin-bottom: var(--spacing-lg);
}

.logo {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

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

/* ==================== 主容器 ==================== */
.main-container {
    padding: var(--spacing-lg) 0;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--spacing-lg);
    align-items: start;
}

/* ==================== 左侧面板 ==================== */
.left-panel {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow);
    min-height: 500px;
}

/* 上传区域 */
.upload-section {
    width: 100%;
}

.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-light);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
    transform: translateY(-2px);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
    transform: scale(1.02);
}

.upload-content {
    pointer-events: none;
    user-select: none;
}

.upload-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
}

.upload-area h3 {
    font-size: 20px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.upload-area p {
    color: var(--text-gray);
    margin-bottom: var(--spacing-xs);
}

.upload-tip {
    font-size: 13px;
    color: var(--text-light);
}

/* 预览区域 */
.preview-section {
    animation: fadeIn 0.4s ease;
}

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

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.preview-header h3 {
    font-size: 18px;
    color: var(--text-dark);
}

.preview-container {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    background: #f5f5f5;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    position: relative;
    overflow: hidden;
}

#previewCanvas {
    max-width: 100%;
    max-height: 600px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.preview-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-light);
    border-radius: 8px;
    font-size: 13px;
    color: var(--text-gray);
}

/* ==================== 右侧面板 ==================== */
.right-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.control-section {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--box-shadow);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.section-title .icon {
    font-size: 20px;
}

/* 证件照格式 */
.format-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.format-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-white);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 13px;
}

.format-btn:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
    transform: translateY(-2px);
}

.format-btn.active {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.format-name {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.format-size {
    font-size: 11px;
    color: var(--text-gray);
}

/* 背景移除 */
.bg-remove-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.api-config {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.api-config label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
}

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

.api-input {
    flex: 1;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s ease;
}

.api-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.api-tip {
    font-size: 12px;
    color: var(--text-gray);
    margin: 0;
}

.api-tip a {
    color: var(--primary-color);
    text-decoration: none;
}

.api-tip a:hover {
    text-decoration: underline;
}

.processing-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(102, 126, 234, 0.05);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-dark);
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 背景颜色 */
.color-options {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.color-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-white);
    cursor: pointer;
    transition: all 0.2s ease;
    flex: 1;
    min-width: 70px;
}

.color-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.color-btn.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.color-preview {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.color-name {
    font-size: 12px;
    color: var(--text-gray);
}

.custom-color {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    flex: 1;
    min-width: 70px;
}

.custom-color:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

#customColor {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    cursor: pointer;
}

.custom-color-label {
    font-size: 12px;
    color: var(--text-gray);
    cursor: pointer;
}

/* 照片调整 */
.adjustment-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.control-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.control-item label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
}

.position-controls,
.zoom-controls {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.btn-icon {
    width: 40px;
    height: 40px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-white);
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
    transform: scale(1.05);
}

.btn-icon:active {
    transform: scale(0.95);
}

#zoomLevel {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    min-width: 50px;
    text-align: center;
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-light);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.4);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.4);
}

/* 下载选项 */
.download-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.option-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.option-row label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    min-width: 70px;
}

.select-box {
    flex: 1;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-white);
    color: var(--text-dark);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.select-box:hover {
    border-color: var(--primary-color);
}

.select-box:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* 按钮样式 */
.btn-primary,
.btn-secondary {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: var(--bg-gradient);
    color: white;
    box-shadow: var(--box-shadow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-hover);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-white);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

.btn-large {
    width: 100%;
    padding: 16px 24px;
    font-size: 16px;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

/* ==================== 底部 ==================== */
.footer {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.help-tips {
    max-width: 800px;
    margin: 0 auto;
}

.help-tips h4 {
    font-size: 18px;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.help-tips ul {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.help-tips li {
    padding: var(--spacing-xs) 0;
    color: var(--text-gray);
    font-size: 14px;
}

.privacy-note {
    padding: var(--spacing-md);
    background: rgba(102, 126, 234, 0.05);
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
    color: var(--text-dark);
    font-size: 14px;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }
    
    .right-panel {
        order: 2;
    }
}

@media (max-width: 768px) {
    .format-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .color-options {
        justify-content: space-between;
    }
    
    .color-btn,
    .custom-color {
        min-width: 60px;
    }
    
    .position-controls,
    .zoom-controls {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 22px;
    }
    
    .format-grid {
        grid-template-columns: 1fr;
    }
    
    .help-tips li {
        font-size: 13px;
    }
}