:root {
    --primary-gradient: linear-gradient(135deg, #10a37f 0%, #0e916f 100%);
    --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    --card-gradient: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    --primary-color: #10a37f;
    --hover-color: #0e916f;
    --bg-color: #f7f7f8;
    --card-bg: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    background: var(--bg-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* 添加背景装饰 */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(16, 163, 127, 0.03) 0%, transparent 60%);
    z-index: -1;
}

/* 添加几何图案装饰 */
body::after {
    content: '';
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 100% 0%, rgba(16, 163, 127, 0.05) 0%, transparent 25%),
        radial-gradient(circle at 0% 100%, rgba(16, 163, 127, 0.05) 0%, transparent 25%);
    z-index: -1;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
}

h1 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    position: relative;
    padding-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    width: 120px;
    height: 4px;
    background: var(--primary-gradient);
    border-radius: 2px;
    left: 50%;
    transform: translateX(-50%);
}

.converter {
    background: var(--card-gradient);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 
        0 4px 6px -1px var(--shadow-color),
        0 2px 4px -2px var(--shadow-color),
        0 0 0 1px rgba(255, 255, 255, 0.1);
    flex: 1;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

/* 添加卡片装饰 */
.converter::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.3) 50%, 
        transparent 100%);
}

.editor-container {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    height: calc(100vh - 250px);
    min-height: 500px;
    width: 100%;
    position: relative;
}

.input-area, .preview-area {
    flex: 0 0 50%;
    display: flex;
    flex-direction: column;
    background: rgba(248, 250, 252, 0.8);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 
        inset 0 2px 4px 0 rgba(0, 0, 0, 0.05),
        0 0 0 1px rgba(255, 255, 255, 0.1);
    min-width: 0;
    max-width: 50%;
    backdrop-filter: blur(5px);
}

h2 {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

textarea, .preview-content {
    width: 100%;
    flex: 1;
    padding: 2rem 2.5rem;
    border: 1px solid rgba(226, 232, 240, 0.6);
    border-radius: 8px;
    font-size: 0.95rem;
    line-height: 1.6;
    background: rgba(255, 255, 255, 0.9);
    overflow: auto;
    word-wrap: break-word;
    white-space: pre-wrap;
}

.preview-content {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem 2.5rem;
}

.preview-content h1,
.preview-content h2,
.preview-content h3,
.preview-content h4 {
    margin-top: 1.5em;
    margin-bottom: 0.8em;
}

.preview-content p,
.preview-content ul,
.preview-content ol {
    margin: 1em 0;
    line-height: 1.8;
}

.preview-content ul,
.preview-content ol {
    padding-left: 2em;
}

.preview-content li {
    margin: 0.5em 0;
}

.preview-content blockquote {
    margin: 1.5em 0;
    padding: 1em 1.5em;
    border-left: 4px solid var(--primary-color);
    background: rgba(241, 245, 249, 0.6);
}

/* 优化代码块显示 */
.preview-content pre {
    margin: 1.5em 0;
    padding: 1.5rem;
    background: rgba(241, 245, 249, 0.9);
    border-radius: 8px;
    overflow-x: auto;
}

.preview-content code {
    padding: 0.2em 0.4em;
    background-color: #f1f5f9;
    border-radius: 4px;
    font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
}

.preview-content pre {
    overflow-x: auto;
    max-width: 100%;
}

.preview-content pre code {
    white-space: pre;
    display: block;
    min-width: 100%;
}

.preview-content table {
    display: block;
    overflow-x: auto;
    max-width: 100%;
}

.buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

button {
    padding: 0.75rem 1.75rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

#convertBtn {
    background: var(--primary-gradient);
    color: white;
}

#convertBtn:hover {
    transform: translateY(-1px);
    box-shadow: 
        0 4px 12px rgba(16, 163, 127, 0.2),
        0 0 0 2px rgba(16, 163, 127, 0.1);
}

#uploadBtn {
    background: rgba(248, 250, 252, 0.8);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(5px);
}

#uploadBtn:hover {
    background: rgba(241, 245, 249, 0.9);
    transform: translateY(-1px);
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.1),
        0 0 0 2px rgba(226, 232, 240, 0.4);
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(203, 213, 225, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: rgba(203, 213, 225, 0.5);
    border-radius: 4px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(148, 163, 184, 0.7);
    border: 2px solid transparent;
    background-clip: padding-box;
}

/* 响应式设计优化 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .editor-container {
        flex-direction: column;
        height: auto;
    }
    
    .input-area, .preview-area {
        flex: 1 1 auto;
        width: 100%;
        max-width: 100%;
        min-height: 300px;
    }
    
    h1 {
        font-size: 2rem;
        margin-bottom: 1.5rem;
    }

    .converter {
        padding: 1rem;
    }
}

.error-message {
    color: #721c24;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
}