:root{--bg:#f5f6f8;--card:#ffffff;--border:#e3e6eb;--text:#1f2430;--muted:#6b7280;--green:#16a34a;--yellow:#d97706;--red:#dc2626;--blue:#2563eb}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text)}a{color:var(--blue);text-decoration:none}.layout{min-height:100vh}.nav{position:fixed;left:0;top:0;width:220px;height:100vh;background:#10151f;color:#cbd5e1;padding:16px 12px;overflow-y:auto;z-index:120}.nav .brand{font-size:15px;font-weight:700;color:#fff;margin:0 8px 16px;line-height:1.4}.nav a{display:block;padding:8px 10px;border-radius:8px;color:#cbd5e1;margin-bottom:2px;font-size:14px}.nav a:hover{background:#1e293b;color:#fff}.nav a.active{background:var(--blue);color:#fff}.main{margin-left:220px;padding:24px 28px}.error,.grid,.loading,.subtitle,.table-wrap,form,h1{max-width:1400px}h1{font-size:20px;margin:0 0 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