:root{--primary-color: #3a86ff;--secondary-color: #8338ec;--accent-color: #06d6a0;--dark-color: #1a1a2e;--light-color: #f8f9fa;--gray-color: #6c757d;--card-bg: #ffffff;--body-bg: #f5f7fa;--text-color: #333333;--footer-bg: #16213e}.dark-mode{--primary-color: #4cc9f0;--secondary-color: #b5179e;--accent-color: #06d6a0;--dark-color: #e2e2e2;--light-color: #1a1a2e;--gray-color: #b8b8b8;--card-bg: #16213e;--body-bg: #0f1621;--text-color: #e2e2e2;--footer-bg: #0a0e1a}*{margin:0;padding:0;box-sizing:border-box;font-family:Segoe UI,Microsoft YaHei,Arial,sans-serif}body{line-height:1.6;color:var(--text-color);background-color:var(--body-bg);transition:background-color .3s ease,color .3s ease}a{text-decoration:none;color:var(--primary-color)}a:hover{color:var(--accent-color)}.app-root{position:relative;min-height:100vh}.app-root main{min-height:40vh}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 15px}.btn{display:inline-block;padding:12px 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