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

:root {
    /* 苹果系统颜色 - 更精确的色值 */
    --apple-blue: #007AFF;
    --apple-blue-hover: #0051D5;
    --apple-blue-light: rgba(0, 122, 255, 0.1);
    --apple-green: #34C759;
    --apple-green-hover: #30D158;
    --apple-red: #FF3B30;
    --apple-orange: #FF9500;
    --apple-cyan: #5AC8FA;
    
    /* 灰度系统 - 苹果的精确灰度 */
    --apple-gray-50: #FBFBFD;
    --apple-gray-100: #F5F5F7;
    --apple-gray-200: #E8E8ED;
    --apple-gray-300: #D1D1D6;
    --apple-gray-400: #C7C7CC;
    --apple-gray-500: #AEAEB2;
    --apple-gray-600: #8E8E93;
    --apple-gray-700: #636366;
    --apple-gray-800: #48484A;
    --apple-gray-900: #1D1D1F;
    
    /* 文本颜色 */
    --apple-text-primary: #1D1D1F;
    --apple-text-secondary: #86868B;
    --apple-text-tertiary: #C7C7CC;
    --apple-text-white: #FFFFFF;
    
    /* 背景颜色 */
    --apple-bg-primary: #FFFFFF;
    --apple-bg-secondary: #FBFBFD;
    --apple-bg-tertiary: #F5F5F7;
    --apple-bg-elevated: rgba(255, 255, 255, 0.8);
    
    /* 阴影系统 - 多层阴影 */
    --apple-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
    --apple-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.06);
    --apple-shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.12), 0 4px 8px rgba(0, 0, 0, 0.08);
    --apple-shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.16), 0 8px 16px rgba(0, 0, 0, 0.12);
    --apple-shadow-2xl: 0 32px 64px rgba(0, 0, 0, 0.2), 0 16px 32px rgba(0, 0, 0, 0.16);
    
    /* 边框 */
    --apple-border: rgba(0, 0, 0, 0.1);
    --apple-border-light: rgba(0, 0, 0, 0.06);
    --apple-border-dark: rgba(0, 0, 0, 0.15);
    
    /* 间距系统 - 8px基础单位 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* 圆角系统 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* 动画曲线 - 苹果标准 */
    --ease-out: cubic-bezier(0.33, 1, 0.68, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: 
        radial-gradient(circle at 20% 50%, rgba(90, 200, 250, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(90, 200, 250, 0.03) 0%, transparent 50%),
        linear-gradient(180deg, var(--apple-bg-secondary) 0%, var(--apple-bg-tertiary) 100%);
    min-height: 100vh;
    padding: var(--spacing-lg);
    color: var(--apple-text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "kern" 1;
    text-rendering: optimizeLegibility;
    line-height: 1.5;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    background: var(--apple-bg-elevated);
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
    border-radius: var(--radius-2xl);
    box-shadow: var(--apple-shadow-2xl);
    overflow: hidden;
    border: 0.5px solid var(--apple-border-light);
    position: relative;
}

.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.8) 50%, 
        transparent 100%);
    pointer-events: none;
}

header {
    background: 
        linear-gradient(135deg, 
            rgba(90, 200, 250, 0.08) 0%, 
            rgba(0, 122, 255, 0.08) 50%,
            rgba(0, 199, 190, 0.08) 100%);
    backdrop-filter: blur(40px) saturate(200%);
    -webkit-backdrop-filter: blur(40px) saturate(200%);
    padding: var(--spacing-3xl) var(--spacing-2xl);
    text-align: center;
    border-bottom: 0.5px solid var(--apple-border);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(90, 200, 250, 0.06) 0%, transparent 70%);
    animation: pulse 20s ease-in-out infinite;
    pointer-events: none;
}

@keyframes pulse {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.5; }
    50% { transform: translate(10%, 10%) scale(1.1); opacity: 0.8; }
}

header h1 {
    font-size: 56px;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: var(--spacing-md);
    color: var(--apple-text-primary);
    position: relative;
    z-index: 1;
    line-height: 1.1;
    background: linear-gradient(135deg, 
        #5AC8FA 0%, 
        var(--apple-blue) 50%,
        #00C7BE 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradient-shift 8s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.subtitle {
    font-size: 19px;
    color: var(--apple-text-secondary);
    font-weight: 400;
    letter-spacing: -0.3px;
    position: relative;
    z-index: 1;
    line-height: 1.4;
}

main {
    padding: var(--spacing-2xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    background: var(--apple-bg-primary);
    position: relative;
}

.input-section,
.output-section {
    display: flex;
    flex-direction: column;
    position: relative;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.section-header h2 {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--apple-text-primary);
    line-height: 1.2;
    flex: 1;
    min-width: 200px;
}

.action-buttons,
.format-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    align-items: center;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s var(--ease-out);
    white-space: nowrap;
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
    letter-spacing: -0.2px;
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    line-height: 1.4;
    user-select: none;
    -webkit-user-select: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    transform: translate(-50%, -50%);
    transition: width 0.6s var(--ease-out), height 0.6s var(--ease-out);
    pointer-events: none;
}

.btn:active::before {
    width: 400px;
    height: 400px;
}

.btn-primary {
    background: linear-gradient(135deg, #5AC8FA 0%, var(--apple-blue) 100%);
    color: var(--apple-text-white);
    box-shadow: 
        0 4px 12px rgba(90, 200, 250, 0.35),
        0 2px 6px rgba(90, 200, 250, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        inset 0 -1px 0 rgba(0, 0, 0, 0.05);
    border: 0.5px solid rgba(255, 255, 255, 0.2);
    position: relative;
}

.btn-primary::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.2) 0%, transparent 100%);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    pointer-events: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #6DD3FF 0%, #1A8FFF 100%);
    transform: translateY(-2px);
        box-shadow: 
        0 8px 20px rgba(90, 200, 250, 0.45),
        0 4px 10px rgba(90, 200, 250, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.35),
        inset 0 -1px 0 rgba(0, 0, 0, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
    background: linear-gradient(135deg, #4AB8E8 0%, #0066CC 100%);
        box-shadow: 
        0 2px 6px rgba(90, 200, 250, 0.35),
        0 1px 3px rgba(90, 200, 250, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-secondary {
    background: var(--apple-bg-secondary);
    color: var(--apple-text-primary);
    border: 0.5px solid var(--apple-border);
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.04),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.btn-secondary:hover {
    background: var(--apple-bg-tertiary);
    transform: translateY(-1px);
    box-shadow: 
        0 4px 8px rgba(0, 0, 0, 0.08),
        0 1px 3px rgba(0, 0, 0, 0.06),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
    border-color: var(--apple-border-dark);
}

.btn-secondary:active {
    transform: translateY(0);
    background: var(--apple-gray-200);
    box-shadow: 
        0 1px 2px rgba(0, 0, 0, 0.06),
        inset 0 1px 2px rgba(0, 0, 0, 0.04);
}

.btn-success {
    background: linear-gradient(135deg, var(--apple-green) 0%, #30D158 100%);
    color: var(--apple-text-white);
    padding: 14px 32px;
    font-size: 17px;
    font-weight: 600;
    box-shadow: 
        0 4px 12px rgba(52, 199, 89, 0.3),
        0 2px 4px rgba(52, 199, 89, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    border: 0.5px solid rgba(255, 255, 255, 0.1);
}

.btn-success:hover {
    background: linear-gradient(135deg, var(--apple-green-hover) 0%, #28CD41 100%);
    transform: translateY(-2px);
    box-shadow: 
        0 8px 20px rgba(52, 199, 89, 0.4),
        0 4px 8px rgba(52, 199, 89, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-success:active {
    transform: translateY(0);
    box-shadow: 
        0 2px 6px rgba(52, 199, 89, 0.3),
        0 1px 3px rgba(52, 199, 89, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

#markdownInput {
    width: 100%;
    min-height: 480px;
    padding: var(--spacing-lg);
    border: 0.5px solid var(--apple-border);
    border-radius: var(--radius-lg);
    font-size: 15px;
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Consolas', 'Courier New', monospace;
    resize: vertical;
    transition: all 0.3s var(--ease-out);
    background: var(--apple-bg-primary);
    color: var(--apple-text-primary);
    line-height: 1.7;
    box-shadow: 
        inset 0 2px 4px rgba(0, 0, 0, 0.04),
        inset 0 1px 2px rgba(0, 0, 0, 0.02);
    font-feature-settings: "liga" 1, "calt" 1;
}

#markdownInput:focus {
    outline: none;
    border-color: #5AC8FA;
    box-shadow: 
        0 0 0 4px rgba(90, 200, 250, 0.15),
        inset 0 2px 4px rgba(0, 0, 0, 0.04),
        inset 0 1px 2px rgba(0, 0, 0, 0.02);
    background: var(--apple-bg-primary);
}

#markdownInput::placeholder {
    color: var(--apple-text-tertiary);
    opacity: 0.7;
    font-weight: 400;
}

.output-container {
    flex: 1;
    min-height: 480px;
    border: 0.5px solid var(--apple-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    background: var(--apple-bg-primary);
    box-shadow: 
        inset 0 2px 4px rgba(0, 0, 0, 0.04),
        inset 0 1px 2px rgba(0, 0, 0, 0.02);
    transition: all 0.3s var(--ease-out);
}

.output-container:focus-within {
    border-color: #5AC8FA;
    box-shadow: 
        0 0 0 4px rgba(90, 200, 250, 0.15),
        inset 0 2px 4px rgba(0, 0, 0, 0.04),
        inset 0 1px 2px rgba(0, 0, 0, 0.02);
}

.output-preview {
    width: 100%;
    height: 100%;
    padding: var(--spacing-lg);
    overflow-y: auto;
    overflow-x: hidden;
    display: none;
    background: var(--apple-bg-primary);
    color: var(--apple-text-primary);
    line-height: 1.8;
    font-size: 15px;
    scroll-behavior: smooth;
}

.output-preview.active {
    display: block;
}

.output-preview::-webkit-scrollbar {
    width: 10px;
}

.output-preview::-webkit-scrollbar-track {
    background: transparent;
}

.output-preview::-webkit-scrollbar-thumb {
    background: var(--apple-gray-300);
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    background-clip: padding-box;
}

.output-preview::-webkit-scrollbar-thumb:hover {
    background: var(--apple-gray-400);
}

.output-preview h1, 
.output-preview h2, 
.output-preview h3,
.output-preview h4,
.output-preview h5,
.output-preview h6 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    letter-spacing: -0.4px;
    color: var(--apple-text-primary);
    line-height: 1.3;
}

.output-preview h1 {
    font-size: 36px;
    margin-top: 0;
}

.output-preview h2 {
    font-size: 28px;
}

.output-preview h3 {
    font-size: 22px;
}

.output-preview h4 {
    font-size: 19px;
}

.output-preview p {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
    color: var(--apple-text-primary);
}

.output-preview ul, 
.output-preview ol {
    margin-left: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-sm);
}

.output-preview li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.8;
}

.output-preview code {
    background: var(--apple-bg-tertiary);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 14px;
    border: 0.5px solid var(--apple-border-light);
    color: var(--apple-text-primary);
    font-weight: 500;
}

.output-preview pre {
    background: var(--apple-bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
    border: 0.5px solid var(--apple-border-light);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04);
}

.output-preview pre code {
    background: transparent;
    padding: 0;
    border: none;
    font-weight: 400;
}

.output-preview blockquote {
    border-left: 4px solid #5AC8FA;
    padding-left: var(--spacing-lg);
    margin: var(--spacing-md) 0;
    color: var(--apple-text-secondary);
    font-style: italic;
}

.output-preview a {
    color: #5AC8FA;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.2s var(--ease-out);
}

.output-preview a:hover {
    border-bottom-color: #5AC8FA;
}

.output-preview table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
    border: 0.5px solid var(--apple-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.output-preview th,
.output-preview td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 0.5px solid var(--apple-border-light);
}

.output-preview th {
    background: var(--apple-bg-tertiary);
    font-weight: 600;
}

.output-text {
    width: 100%;
    height: 100%;
    min-height: 480px;
    padding: var(--spacing-lg);
    border: none;
    font-size: 15px;
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Consolas', 'Courier New', monospace;
    resize: none;
    display: none;
    background: var(--apple-bg-primary);
    color: var(--apple-text-primary);
    line-height: 1.7;
    font-feature-settings: "liga" 1, "calt" 1;
}

.output-text.active {
    display: block;
}

.output-text::-webkit-scrollbar {
    width: 10px;
}

.output-text::-webkit-scrollbar-track {
    background: transparent;
}

.output-text::-webkit-scrollbar-thumb {
    background: var(--apple-gray-300);
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    background-clip: padding-box;
}

.output-text::-webkit-scrollbar-thumb:hover {
    background: var(--apple-gray-400);
}

.output-text::placeholder {
    color: var(--apple-text-tertiary);
    opacity: 0.7;
    font-weight: 400;
}

.download-section {
    margin-top: var(--spacing-xl);
    text-align: center;
}

.action-buttons-group {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.action-buttons-group .btn {
    min-width: 120px;
}

@media (max-width: 768px) {
    .action-buttons-group {
        flex-direction: column;
        width: 100%;
    }
    
    .action-buttons-group .btn {
        width: 100%;
        min-width: 0;
    }
}

footer {
    background: var(--apple-bg-tertiary);
    padding: var(--spacing-xl) var(--spacing-2xl);
    text-align: center;
    color: var(--apple-text-secondary);
    font-size: 14px;
    border-top: 0.5px solid var(--apple-border);
    font-weight: 400;
    letter-spacing: -0.1px;
    line-height: 1.6;
}

/* 响应式设计 - 平板 */
@media (max-width: 1024px) {
    main {
        gap: var(--spacing-xl);
        padding: var(--spacing-xl);
    }
    
    header {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }
    
    header h1 {
        font-size: 48px;
    }
}

/* 响应式设计 - 手机端 */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-sm);
        background: var(--apple-bg-tertiary);
        -webkit-tap-highlight-color: rgba(90, 200, 250, 0.15);
    }

    .container {
        border-radius: var(--radius-lg);
        box-shadow: var(--apple-shadow-lg);
        margin: 0;
        max-width: 100%;
    }

    header {
        padding: var(--spacing-xl) var(--spacing-md);
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }

    header h1 {
        font-size: 32px;
        letter-spacing: -0.6px;
        line-height: 1.2;
        margin-bottom: var(--spacing-sm);
    }

    .subtitle {
        font-size: 15px;
        line-height: 1.4;
        padding: 0 var(--spacing-xs);
    }

    main {
        grid-template-columns: 1fr;
        padding: var(--spacing-md);
        gap: var(--spacing-lg);
    }

    .section-header {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    .section-header h2 {
        font-size: 22px;
        font-weight: 700;
        letter-spacing: -0.4px;
        margin: 0;
    }

    .action-buttons,
    .format-buttons {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
        gap: var(--spacing-sm);
    }

    .btn {
        min-height: 48px; /* 苹果推荐的最小触摸目标 */
        font-size: 16px; /* 防止iOS自动缩放 */
        padding: 14px 16px;
        border-radius: var(--radius-md);
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation; /* 优化触摸响应 */
        user-select: none;
        -webkit-user-select: none;
        display: flex;
        align-items: center;
        justify-content: center;
        flex: 1;
        min-width: 0;
    }

    .btn:active {
        transform: scale(0.98);
        transition: transform 0.1s var(--ease-out);
    }

    .btn-primary {
        font-weight: 600;
    }
    
    .btn-primary::after {
        border-radius: var(--radius-md) var(--radius-md) 0 0;
    }

    .btn-secondary {
        font-weight: 500;
    }

    .btn-success {
        min-height: 52px;
        font-size: 17px;
        font-weight: 600;
        padding: 16px 24px;
        width: 100%;
        max-width: 100%;
    }

    #markdownInput {
        min-height: 280px;
        border-radius: var(--radius-md);
        padding: var(--spacing-md);
        font-size: 16px; /* 防止iOS自动缩放 */
        line-height: 1.6;
        -webkit-appearance: none;
        appearance: none;
        resize: none;
    }

    #markdownInput:focus {
        box-shadow: 
            0 0 0 3px rgba(90, 200, 250, 0.2),
            inset 0 2px 4px rgba(0, 0, 0, 0.04);
    }

    .output-container {
        min-height: 280px;
        border-radius: var(--radius-md);
    }

    .output-text {
        min-height: 280px;
        padding: var(--spacing-md);
        font-size: 16px; /* 防止iOS自动缩放 */
        line-height: 1.6;
    }

    .output-preview {
        padding: var(--spacing-md);
        font-size: 16px;
        line-height: 1.7;
    }

    .output-preview h1 {
        font-size: 28px;
        margin-top: 0;
    }

    .output-preview h2 {
        font-size: 24px;
    }

    .output-preview h3 {
        font-size: 20px;
    }

    .download-section {
        margin-top: var(--spacing-md);
    }

    footer {
        padding: var(--spacing-md);
        font-size: 12px;
        line-height: 1.5;
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    }

    footer p {
        margin: 0;
        padding: 0 var(--spacing-xs);
    }
}

/* 小屏手机优化 (iPhone SE等) */
@media (max-width: 375px) {
    body {
        padding: var(--spacing-xs);
    }

    header {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    header h1 {
        font-size: 28px;
    }

    .subtitle {
        font-size: 14px;
    }

    main {
        padding: var(--spacing-sm);
        gap: var(--spacing-md);
    }

    .section-header h2 {
        font-size: 20px;
    }

    .action-buttons,
    .format-buttons {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }

    .btn {
        width: 100%;
        min-height: 44px;
    }

    #markdownInput,
    .output-container {
        min-height: 240px;
    }

    .output-text {
        min-height: 240px;
    }
}

/* 横屏手机优化 */
@media (max-width: 768px) and (orientation: landscape) {
    header {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    header h1 {
        font-size: 28px;
    }

    main {
        padding: var(--spacing-md);
        gap: var(--spacing-md);
    }

    #markdownInput,
    .output-container {
        min-height: 200px;
    }

    .output-text {
        min-height: 200px;
    }
}

/* 加载动画 */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2.5px solid rgba(90, 200, 250, 0.25);
    border-top: 2.5px solid #5AC8FA;
    border-radius: 50%;
    animation: spin 0.8s var(--ease-in-out) infinite;
    margin-right: var(--spacing-sm);
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 选中文本样式 */
::selection {
    background: rgba(90, 200, 250, 0.3);
    color: var(--apple-text-primary);
}

::-moz-selection {
    background: rgba(90, 200, 250, 0.3);
    color: var(--apple-text-primary);
}

/* 焦点可见性 */
*:focus-visible {
    outline: 2px solid #5AC8FA;
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* 禁用状态 */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* 工具提示样式（如果需要） */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    padding: 6px 12px;
    background: var(--apple-gray-900);
    color: var(--apple-text-white);
    font-size: 13px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s var(--ease-out), transform 0.2s var(--ease-out);
    z-index: 1000;
}

.tooltip:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(-4px);
}

/* 微妙的动画增强 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.input-section,
.output-section {
    animation: fadeIn 0.6s var(--ease-out);
}

.input-section {
    animation-delay: 0.1s;
    animation-fill-mode: both;
}

.output-section {
    animation-delay: 0.2s;
    animation-fill-mode: both;
}

/* 深色模式支持（可选） */
@media (prefers-color-scheme: dark) {
    :root {
        --apple-text-primary: #F5F5F7;
        --apple-text-secondary: #AEAEB2;
        --apple-text-tertiary: #636366;
        --apple-bg-primary: #1C1C1E;
        --apple-bg-secondary: #000000;
        --apple-bg-tertiary: #2C2C2E;
        --apple-border: rgba(255, 255, 255, 0.1);
        --apple-border-light: rgba(255, 255, 255, 0.06);
        --apple-border-dark: rgba(255, 255, 255, 0.15);
    }
}