/* ============================================
   MossCutter v1.1.0 - 现代化UI设计
   设计理念：专业、现代、用户友好
   ============================================ */

/* 基础样式重置与变量定义 */
:root {
    /* 主色调 - 专业蓝紫色系 */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --primary-bg: #f5f3ff;
    
    /* 辅助色 */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    
    /* 中性色 */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    --bg-color: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* 过渡动画 */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #f5f3ff 0%, #e0e7ff 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-color);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    padding: 40px;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* 装饰性背景元素 */
.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color), var(--info-color));
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

/* 头部样式 */
header {
    text-align: center;
    margin-bottom: 48px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

header h1 {
    color: var(--text-primary);
    font-size: 2.75rem;
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.025em;
}

header h1 i {
    margin-right: 16px;
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    font-weight: 500;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ============================================
   上传区域 - 现代化设计
   ============================================ */
.upload-section {
    margin-bottom: 48px;
}

.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: var(--radius-xl);
    padding: 40px 32px;
    text-align: center;
    background: var(--bg-secondary);
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(99, 102, 241, 0.03) 0%,
        rgba(79, 70, 229, 0.03) 100%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.upload-area:hover::before {
    opacity: 1;
}

/* 点击反馈效果 */
.upload-area:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-dark);
}

.upload-area.click-feedback {
    animation: clickPulse 0.3s ease;
}

@keyframes clickPulse {
    0% {
        transform: scale(0.98);
        box-shadow: var(--shadow-sm);
    }
    50% {
        transform: scale(1.02);
        box-shadow: var(--shadow-lg);
    }
    100% {
        transform: scale(1);
        box-shadow: var(--shadow-md);
    }
}

.upload-area.drag-over {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.05);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { border-color: var(--success-color); }
    50% { border-color: var(--primary-color); }
}

.upload-icon {
    font-size: 3.5rem;
    color: var(--text-tertiary);
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
    transition: transform var(--transition-normal), color var(--transition-normal);
}

.upload-area:hover .upload-icon {
    color: var(--primary-color);
    transform: scale(1.1);
}

.upload-area h3 {
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 1.375rem;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 1rem;
    position: relative;
    z-index: 1;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* 简洁的点击提示 - 只在悬停时显示 */
.upload-area:hover p::after {
    content: "💡 整个区域都可点击";
    display: block;
    font-size: 0.85rem;
    color: var(--primary-color);
    margin-top: 4px;
    font-weight: 500;
    opacity: 0.8;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 0.8; transform: translateY(0); }
}
}

/* 预览区域 */
.preview-section {
    margin-top: 30px;
}

.preview-container {
    position: relative;
    width: 100%;
    margin: 20px 0;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    background: #f8f9fa;
    text-align: center;
    padding: 20px;
    box-sizing: border-box;
    min-height: 100px;
}

#previewCanvas {
    display: block;
    max-width: 100%;
    max-height: 500px;
    width: auto;
    height: auto;
    margin: 0 auto;
}

.grid-overlay {
    position: absolute;
    pointer-events: none;
    /* 位置由JavaScript动态设置 */
}

.image-info {
    text-align: center;
    margin-top: 10px;
    color: #4a5568;
    font-weight: 500;
}

/* ============================================
   切割结果预览区域
   ============================================ */
.preview-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.preview-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.preview-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
    text-align: center;
}

/* 预览网格容器 */
.preview-grid-container {
    background: linear-gradient(135deg, var(--bg-color), var(--bg-secondary));
    border-radius: var(--radius-xl);
    padding: 24px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

/* 预览网格 */
.preview-grid {
    display: grid;
    gap: 16px;
    justify-content: center;
}

/* 优化预览项 */
.preview-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    background: var(--bg-color);
    box-shadow: var(--shadow-sm);
}

.preview-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.preview-item.selected {
    border-color: var(--success-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* 预览复选框 */
.preview-checkbox {
    position: absolute;
    top: 12px;
    left: 12px;
    width: 24px;
    height: 24px;
    background: rgba(255, 255, 255, 0.95);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    z-index: 10;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-checkbox:hover {
    border-color: var(--primary-color);
}

.preview-checkbox.checked {
    background: var(--success-color);
    border-color: var(--success-color);
}

.preview-checkbox.checked::after {
    content: "✓";
    color: white;
    font-size: 14px;
    font-weight: bold;
}

/* 预览信息覆盖层 */
.preview-info-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.85), transparent);
    color: white;
    padding: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.preview-item:hover .preview-info-overlay {
    opacity: 1;
}

.preview-index {
    font-size: 0.85rem;
    font-weight: 600;
}

.preview-download-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    cursor: pointer;
    transition: background var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 6px;
}

.preview-download-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ZIP下载区域 */
.zip-download-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 32px;
    text-align: center;
    border: 1px solid var(--border-color);
    margin-top: 24px;
}

.grid-preview {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.download-info {
    margin-top: 12px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .preview-controls {
        flex-direction: column;
        gap: 16px;
        align-items: stretch;
    }
    
    .preview-actions {
        justify-content: center;
    }
    
    .preview-info {
        text-align: center;
    }
    
    .preview-grid {
        gap: 12px;
    }
    
    .preview-info-overlay {
        flex-direction: column;
        gap: 8px;
        text-align: center;
        padding: 8px;
    }
    
    .preview-controls, .preview-grid-container, .zip-download-section {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .preview-actions {
        flex-direction: column;
    }
    
    .preview-actions .btn {
        width: 100%;
    }
    
    .preview-grid {
        gap: 10px;
    }
}

/* 网格尺寸配置 */
.grid-size-1 { grid-template-columns: repeat(1, 1fr); }
.grid-size-2 { grid-template-columns: repeat(2, 1fr); }
.grid-size-3 { grid-template-columns: repeat(3, 1fr); }
.grid-size-4 { grid-template-columns: repeat(4, 1fr); }
.grid-size-5 { grid-template-columns: repeat(5, 1fr); }
.grid-size-6 { grid-template-columns: repeat(6, 1fr); }

/* 预览项尺寸配置 */
.preview-size-small { max-width: 120px; }
.preview-size-medium { max-width: 160px; }
.preview-size-large { max-width: 200px; }

/* ============================================
   控制区域 - 现代化设计
   ============================================ */
.controls-section {
    margin-bottom: 48px;
}

.controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

@media (max-width: 768px) {
    .controls-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

.grid-controls, .cutting-controls, .output-controls {
    background: var(--bg-secondary);
    padding: 32px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

/* 右列：上下两个区域 */
.right-column {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

@media (max-width: 768px) {
    .right-column {
        gap: 24px;
    }
}

/* 切割设置区特定样式 */
.cutting-controls {
    flex: 1;
}

/* 输出设置区特定样式 */
.output-controls {
    flex: 1;
}

.grid-controls::before, .output-controls::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    opacity: 0.8;
}

.grid-controls:hover, .output-controls:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.grid-controls h3, .output-controls h3 {
    color: var(--text-primary);
    margin-bottom: 24px;
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
}

.grid-controls h3 i, .output-controls h3 i {
    color: var(--primary-color);
    font-size: 1.375rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.grid-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
}

@media (max-width: 480px) {
    .grid-inputs {
        grid-template-columns: 1fr;
    }
}

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

.input-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9375rem;
    letter-spacing: 0.025em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-group label i {
    color: var(--primary-color);
    font-size: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-color);
    transition: all var(--transition-normal);
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

.input-group input:hover,
.input-group select:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    transform: translateY(-1px);
}

.input-group input::placeholder {
    color: var(--text-tertiary);
}

/* 数字输入框美化 */
.input-group input[type="number"] {
    -moz-appearance: textfield;
    font-variant-numeric: tabular-nums;
}

.input-group input[type="number"]::-webkit-inner-spin-button,
.input-group input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* 选择框美化 */
.input-group select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236366f1'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 20px;
    padding-right: 48px;
    cursor: pointer;
}

.input-group select option {
    padding: 12px;
    background: var(--bg-color);
    color: var(--text-primary);
}

/* 滑块美化 */
.input-group input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    outline: none;
    padding: 0;
    margin: 0;
}

.input-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.input-group input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.input-group input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
}

.input-group input[type="range"]::-moz-range-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

/* 预设按钮组 */
.preset-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 8px;
}

/* 智能推荐按钮占满一行 */
.preset-buttons .btn-outline[data-type="smart"] {
    grid-column: 1 / -1; /* 跨越所有列 */
    text-align: center;
}

@media (max-width: 480px) {
    .preset-buttons {
        grid-template-columns: 1fr;
    }
    
    .preset-buttons .btn-outline[data-type="smart"] {
        grid-column: 1; /* 移动端不需要特殊处理 */
    }
}

.preset-buttons .btn-outline {
    padding: 12px 16px;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1.5px solid var(--border-color);
    color: var(--text-secondary);
    background: var(--bg-color);
    transition: all var(--transition-normal);
}

.preset-buttons .btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.preset-buttons .btn-outline:active {
    transform: translateY(0);
}

/* ============================================
   按钮样式 - 现代化设计
   ============================================ */
.btn {
    padding: 14px 28px;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.025em;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn i {
    font-size: 1.125rem;
    transition: transform var(--transition-normal);
}

.btn:hover i {
    transform: translateY(-1px);
}

/* 主按钮 */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 轮廓按钮 */
.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    position: relative;
    z-index: 1;
}

.btn-outline::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.btn-outline:hover {
    color: white;
    border-color: transparent;
}

.btn-outline:hover::after {
    opacity: 1;
}

/* 成功按钮 */
.btn-success {
    background: linear-gradient(135deg, var(--success-color), #0da271);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-success:hover {
    background: linear-gradient(135deg, #0da271, var(--success-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 次要按钮 */
.btn-secondary {
    background: linear-gradient(135deg, var(--text-tertiary), #8b95a6);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #8b95a6, var(--text-tertiary));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 大按钮 */
.btn-large {
    padding: 18px 36px;
    font-size: 1.125rem;
    font-weight: 700;
    border-radius: var(--radius-xl);
}

/* 禁用状态 */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn:disabled::before,
.btn:disabled::after {
    display: none;
}

/* 操作区域 */
.action-section {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 40px;
}

/* 进度条 */
.progress-section {
    text-align: center;
    margin-bottom: 40px;
}

.progress-bar {
    height: 20px;
    background: #e2e8f0;
    border-radius: 10px;
    overflow: hidden;
    margin: 20px 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 10px;
}

#progressText {
    color: #4a5568;
    font-weight: 500;
}

/* 结果区域 */
.result-section {
    text-align: center;
    margin-bottom: 40px;
}

.result-section h3 {
    color: #48bb78;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.grid-preview {
    display: grid;
    gap: 5px;
    margin: 20px auto;
    max-width: 400px;
    border: 2px solid #e2e8f0;
    padding: 10px;
    border-radius: 10px;
    background: #f8f9fa;
}

.grid-preview img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    border: 1px solid #cbd5e0;
}

.download-info {
    margin-top: 15px;
    color: #718096;
    font-size: 0.9rem;
}

.download-info span {
    font-weight: bold;
    color: #667eea;
}

/* 页脚 */
/* ============================================
   页脚 - 现代化设计
   ============================================ */
footer {
    text-align: center;
    padding-top: 40px;
    margin-top: 48px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9375rem;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

footer p {
    margin-bottom: 12px;
    line-height: 1.7;
}

.brand {
    margin: 16px 0;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.brand i {
    background: linear-gradient(135deg, var(--primary-color), var(--success-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.125rem;
}

.tips {
    margin-top: 16px;
    color: var(--text-primary);
    font-style: normal;
    font-weight: 500;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(16, 185, 129, 0.05));
    padding: 16px 24px;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--warning-color);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.tips i {
    color: var(--warning-color);
    margin-right: 10px;
    font-size: 1.125rem;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .action-section {
        flex-direction: column;
    }
    
    .preset-buttons {
        grid-template-columns: 1fr;
    }
}

/* 网格线样式 */
.grid-line {
    position: absolute;
    background: rgba(102, 126, 234, 0.8);
    z-index: 10;
}

.grid-line.vertical {
    width: 2px;
    /* height由JavaScript设置 */
}

.grid-line.horizontal {
    height: 2px;
    /* width由JavaScript设置 */
}

.grid-cell {
    position: absolute;
    border: 1px solid rgba(102, 126, 234, 0.3);
    background: rgba(102, 126, 234, 0.1);
    pointer-events: none;
}

/* ===== v1.1.0 新增样式：预览网格功能 ===== */

/* 预览网格容器 */
   动画效果与微交互
   ============================================ */

/* 页面加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.container {
    animation: fadeInUp 0.6s ease-out;
}

/* 按钮点击动画 */
@keyframes buttonClick {
    0% { transform: scale(1); }
    50% { transform: scale(0.95); }
    100% { transform: scale(1); }
}

.btn:active {
    animation: buttonClick 0.2s ease;
}

/* 图片加载动画 */
@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

.preview-item img {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 1000px 100%;
    animation: shimmer 2s infinite linear;
}

.preview-item img.loaded {
    animation: none;
    background: none;
}

/* 进度条动画 */
@keyframes progressPulse {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

.progress-fill {
    animation: progressPulse 1.5s ease-in-out infinite;
}

/* 成功状态动画 */
@keyframes successPulse {
    0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
    100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.btn-success:not(:disabled) {
    animation: successPulse 2s infinite;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: var(--radius-lg);
    border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

/* 打印样式 */
@media print {
    .container {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .btn, .upload-area, .preview-controls {
        display: none !important;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --primary-dark: #0000cc;
        --text-primary: #000000;
        --border-color: #000000;
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   最终优化与细节调整
   ============================================ */

/* 优化ZIP下载区域 */
.zip-download-section {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    border-radius: var(--radius-xl);
    padding: 32px;
    text-align: center;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    margin-top: 32px;
    position: relative;
    overflow: hidden;
}

.zip-download-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--info-color), var(--primary-color));
}

/* 优化预览网格容器 */