/* 现代化主题配色 */
:root {
    --primary-color: #667eea;
    --primary-dark: #5a6fd6;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-gradient-start: #667eea;
    --bg-gradient-end: #764ba2;
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --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);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

html {
    height: 100%;
}

body {
    min-height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
}

/* 容器样式 */
.container {
    width: 90%;
    max-width: 600px;
    margin: 8% auto 0;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 标题样式 */
h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

h3 {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 1.75rem;
}

/* 列表样式 */
ul {
    list-style: none;
    padding: 0;
}

ul li {
    position: relative;
    padding: 0.875rem 1rem 0.875rem 2.5rem;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: var(--radius-lg);
    border-left: 3px solid var(--primary-color);
    transition: all var(--transition-normal);
    font-size: 0.9375rem;
    color: var(--text-primary);
}

ul li:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

ul li:last-child {
    margin-bottom: 0;
}

/* 图标装饰 */
ul li::before {
    content: '';
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

/* 链接样式 */
a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* 强调文字 */
b {
    color: var(--success-color);
    font-weight: 600;
}

/* 响应式设计 */
@media (max-width: 640px) {
    .container {
        margin: 5% auto 0;
        padding: 1.5rem;
        width: 95%;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    h3 {
        font-size: 1rem;
    }
    
    ul li {
        padding: 0.75rem 0.875rem 0.75rem 2rem;
        font-size: 0.875rem;
    }
    
    ul li::before {
        left: 0.75rem;
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --card-bg: rgba(31, 41, 55, 0.95);
        --text-primary: #f9fafb;
        --text-secondary: #9ca3af;
        --border-color: #374151;
    }
    
    ul li {
        background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    }
    
    ul li:hover {
        background: linear-gradient(135deg, rgba(102, 126, 234, 0.15), rgba(118, 75, 162, 0.15));
    }
}