:root{--bg: #1c1f26;--panel: #232730;--panel-2: #2a2f3a;--card: #2f3542;--card-hover: #353b49;--border: #353a46;--text: #e6e8ee;--text-dim: #9aa3b2;--text-mute: #6b7280;--accent: #4ea3ff;--accent-soft: rgba(78,163,255,.15);--green: #4ade80;--orange: #fb923c;--red: #f87171;--shadow: 0 6px 18px rgba(0,0,0,.35);--radius: 10px}*{box-sizing:border-box}html,body{height:100%;margin:0;overflow:hidden}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro,PingFang SC,Segoe UI,sans-serif;background:var(--bg);color:var(--text);font-size:14px;-webkit-font-smoothing:antialiased;overflow:hidden}.app-shell{display:flex;height:100vh;overflow:hidden}.workspace{flex:1;display:flex;flex-direction:column;min-width:0;min-height:0;overflow:hidden}.sidebar{width:200px;flex-shrink:0;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:14px 10px;overflow-y:auto}.sidebar-brand{font-size:18px;font-weight:700;color:var(--accent);padding:4px 8px 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button.ghost:hover{color:var(--text);border-color:var(--text-mute)}#deleteBtn{color:var(--red)}#deleteBtn:hover{background:#f871711a;border-color:var(--red)}.cards::-webkit-scrollbar,.board::-webkit-scrollbar{width:8px;height:8px}.cards::-webkit-scrollbar-thumb,.board::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.cards::-webkit-scrollbar-thumb:hover{background:var(--text-mute)}.cards:empty:before{content:"拖拽或点击 + 添加";color:var(--text-mute);font-size:12px;text-align:center;padding:20px 10px;display:block;font-style:italic}