/* 基础重置与变量定义 */
:root {
    --primary-color: #3a86ff;
    --primary-light: #5a9cff;
    --primary-dark: #2a6fd6;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --border-color: #dee2e6;
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 6px 12px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 10px 20px rgba(0, 0, 0, 0.2);
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --font-family: 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--dark-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: var(--spacing-sm);
}

/* 应用容器 */
.app-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 32px);
}

/* 头部样式 */
.app-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md) 0;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.header-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.app-header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--dark-color);
    margin: 0;
}

.app-subtitle {
    color: var(--secondary-color);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* 主内容区域 */
.app-main {
    flex: 1;
}

/* 卡片样式 */
.app-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.card-section {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.card-section:last-child {
    border-bottom: none;
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.3rem;
    color: var(--dark-color);
    margin-bottom: var(--spacing-md);
}

.section-title i {
    color: var(--primary-color);
}

/* 上传区域样式 - 修复版 */
.upload-container {
    position: relative;
    width: 100%;
}

.upload-area {
    position: relative;
    border: 3px dashed var(--primary-light);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-xl);
    text-align: center;
    background: linear-gradient(135deg, #f8faff 0%, #e8f1ff 100%);
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #f0f5ff 0%, #dbe8ff 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

/* 关键修复：文件输入框样式 */
.upload-area input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 10;
}

/* 防止上传区域的文本元素阻挡点击 */
.upload-icon,
.upload-text,
.upload-subtext {
    position: relative;
    z-index: 1;
    pointer-events: none;
}

.upload-icon {
    font-size: 3.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.upload-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: var(--spacing-xs);
}

.upload-subtext {
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* 图片信息 */
.image-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--light-color);
    border-radius: var(--border-radius-sm);
    border-left: 4px solid var(--primary-color);
    animation: fadeIn 0.3s ease;
}

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

.image-info i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* 控制组样式 */
.control-group {
    margin-bottom: var(--spacing-md);
}

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

.control-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--dark-color);
}

.control-label i {
    color: var(--primary-color);
    width: 20px;
    text-align: center;
}

/* 输入框样式 */
input[type="text"] {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    transition: all 0.3s ease;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(58, 134, 255, 0.1);
}

.hint {
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-top: 4px;
}

/* 颜色输入 */
.color-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

input[type="color"] {
    width: 50px;
    height: 40px;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    background: transparent;
    -webkit-appearance: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
}

#color-value {
    font-family: monospace;
    background: var(--light-color);
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
}

/* 滑块样式 */
.slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

input[type="range"] {
    flex: 1;
    height: 8px;
    -webkit-appearance: none;
    background: linear-gradient(to right, var(--primary-light), var(--primary-color));
    border-radius: 4px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-light);
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-medium);
}

.slider-container span {
    min-width: 40px;
    text-align: center;
    font-weight: 600;
    color: var(--dark-color);
    background: var(--light-color);
    padding: 6px 10px;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
}

/* 预览区域 */
.preview-container {
    position: relative;
    min-height: 300px;
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(45deg, #f8f9fa 25%, transparent 25%),
                linear-gradient(-45deg, #f8f9fa 25%, transparent 25%),
                linear-gradient(45deg, transparent 75%, #f8f9fa 75%),
                linear-gradient(-45deg, transparent 75%, #f8f9fa 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.preview-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.95);
    z-index: 1;
}

.preview-icon {
    font-size: 4rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.preview-placeholder p {
    color: var(--secondary-color);
    text-align: center;
    max-width: 300px;
}

.image-preview {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

/* Canvas样式 */
.image-preview canvas {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
    cursor: pointer;
}

.image-preview canvas:hover {
    transform: scale(1.01);
    box-shadow: var(--shadow-heavy);
}

/* 按钮样式 */
.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

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

.btn-secondary:hover {
    background: #e9ecef;
    border-color: var(--secondary-color);
    transform: translateY(-2px);
}

/* 页脚样式 */
.app-footer {
    text-align: center;
    padding: var(--spacing-md) 0;
    color: var(--secondary-color);
}

.footer-content {
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

.footer-text {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.footer-text i {
    color: var(--success-color);
}

.footer-note {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 通知样式 */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-heavy);
    z-index: 1000;
    animation: slideIn 0.3s ease;
    font-weight: 500;
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes slideOut {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .app-header h1 {
        font-size: 1.8rem;
    }
    
    .header-icon {
        font-size: 2rem;
    }
    
    .card-section {
        padding: var(--spacing-md);
    }
    
    .control-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .preview-container {
        min-height: 250px;
    }
}

@media (max-width: 480px) {
    body {
        padding: var(--spacing-xs);
    }
    
    .app-header h1 {
        font-size: 1.5rem;
    }
    
    .app-subtitle {
        font-size: 0.9rem;
    }
    
    .section-title {
        font-size: 1.1rem;
    }
    
    .upload-area {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .upload-icon {
        font-size: 2.5rem;
    }
}