:root{--ink:#edf3fb;--muted:#8fa2b8;--line:#23334a;--panel:#122037;--panel-soft:#172a45;--canvas:#091321;--accent:#58c7b1;--accent-strong:#2ba990;--warning:#efb66b;--danger:#ed8791;--shadow:0 18px 50px rgba(0,0,0,.24)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--canvas);color:var(--ink);font-family:Yu Gothic UI,Meiryo,sans-serif}a{color:inherit}button,input,select{font:inherit}button{border:0;border-radius:9px;padding:10px 14px;background:var(--accent);color:#071a1a;cursor:pointer;font-weight:700}button:hover:not(:disabled){background:#79d8c5}button:disabled{cursor:not-allowed;opacity:.45}input,select{width:100%;border:1px solid var(--line);border-radius:8px;padding:10px 12px;background:#0c1a2d;color:var(--ink);outline:none}a:focus-visible,button:focus-visible,input:focus,select:focus{outline:2px solid var(--accent);outline-offset:2px}.app-shell{display:flex;min-height:100vh}.sidebar{width:248px;flex:0 0 248px;border-right:1px solid 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