:root{--bg: #f5f6f8;--bg-card: #ffffff;--text: #1f2430;--text-muted: #6b7280;--border: #e5e7eb;--primary: #2563eb;--primary-hover: #1d4ed8;--danger: #dc2626;--shadow: 0 1px 3px rgba(0, 0, 0, .08);--p1: #dc2626;--p2: #eab308;--p3: #ea580c;--p4: #9ca3af}[data-theme=dark]{--bg: #14161a;--bg-card: #1e2127;--text: #e5e7eb;--text-muted: #9ca3af;--border: #2e323a;--primary: #3b82f6;--primary-hover: #2563eb;--danger: #ef4444;--shadow: 0 1px 3px rgba(0, 0, 0, .4)}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:-apple-system,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}.app-shell{display:flex;flex-direction:column;height:100%;max-width:860px;margin:0 auto}.app-main{flex:1;overflow-y:auto;padding-bottom:64px}.bottom-nav{position:fixed;bottom:0;left:0;right:0;display:flex;background:var(--bg-card);border-top:1px solid 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