:root{--bg: #f4f6f8;--surface: #ffffff;--surface-soft: #f8fafc;--text: #1f2937;--muted: #6b7280;--line: #e5e7eb;--brand: #3557a4;--brand-dark: #244481;--accent: #c9a961;--danger: #d14343;--shadow: 0 18px 45px rgba(31, 41, 55, .08);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft JhengHei,PingFang TC,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-width:320px}button,input,textarea,select{font:inherit}input[type=file]{padding:9px 12px}.form-hint{margin:-6px 0 16px;color:var(--muted);font-size:13px}.field-hint{color:var(--muted);font-size:12px;font-weight:400;line-height:1.5}.form-divider{border-top:1px solid var(--line);margin:20px 0 16px;padding-top:18px}button{cursor:pointer}.admin-shell{display:flex;min-height:100vh}.sidebar{position:sticky;top:0;display:flex;flex:0 0 232px;flex-direction:column;height:100vh;border-right:1px solid var(--line);background:var(--surface);transition:flex-basis .18s ease}.sidebar-collapsed{flex-basis:76px}.brand{display:flex;align-items:center;gap:12px;height:72px;padding:0 22px;border-bottom:1px solid var(--line);color:var(--brand);font-weight:700;white-space:nowrap}.brand img{width:32px;height:32px;object-fit:contain}.nav-list{display:flex;flex:1;flex-direction:column;gap:4px;overflow-y:auto;padding:18px 12px}.nav-item{display:flex;align-items:center;gap:12px;width:100%;min-height:42px;border:0;border-radius:6px;background:transparent;color:#4b5563;padding:0 14px;text-align:left;transition:background .16s ease,color .16s ease}.nav-item:hover,.nav-item-active{background:#eef3ff;color:var(--brand)}.nav-item-active{font-weight:700}.nav-group{display:grid;gap:4px}.nav-chevron{margin-left:auto;transition:transform .16s ease}.nav-chevron-open{transform:rotate(90deg)}.nav-sublist{display:grid;gap:4px;padding-left:30px}.nav-subitem{min-height:36px;border:0;border-radius:6px;background:transparent;color:#4b5563;padding:0 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