:root{--bg: #f5f6f8;--panel: #ffffff;--ink: #1c2430;--muted: #6b7684;--border: #dfe3e8;--accent: #2563eb;--accent-ink: #ffffff;--danger: #dc2626;--green: #15803d;--green-bg: #dcfce7;--gray-bg: #eceff2;--blue-bg: #dbeafe;--red-bg: #fee2e2}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);font-size:14px}a{color:var(--accent)}.app-shell{display:flex;min-height:100vh}.sidebar{width:210px;background:#111827;color:#d1d5db;padding:16px 0;flex-shrink:0}.sidebar .brand{font-weight:700;color:#fff;padding:0 20px 16px;font-size:16px;letter-spacing:.02em}.sidebar nav a{display:block;padding:9px 20px;color:#cbd5e1;text-decoration:none;font-weight:500}.sidebar nav a:hover{background:#1f2937;color:#fff}.sidebar nav a.active{background:var(--accent);color:#fff}.sidebar .nav-group{margin-top:12px;padding:6px 20px 2px;font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:#6b7280}.main{flex:1;display:flex;flex-direction:column;min-width:0}.topbar{background:var(--panel);border-bottom:1px solid var(--border);padding:10px 24px;display:flex;align-items:center;justify-content:space-between}.topbar .ctx{color:var(--muted);font-size:13px}.topbar .ctx strong{color:var(--ink)}.content{padding:24px;flex:1}h1{font-size:22px;margin:0 0 4px}h2{font-size:17px;margin:24px 0 10px}.page-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:16px}.subtitle{color:var(--muted);margin:0 0 16px}button{font:inherit;cursor:pointer;border:1px solid var(--border);background:#fff;color:var(--ink);padding:6px 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