:root{--bg: #f3f6fb;--card: #ffffff;--line: #d7e0ea;--text: #1f2a37;--muted: #6a7b8d;--primary: #0e7490;--danger: #b42318}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:radial-gradient(circle at 0% 0%,#dff2ff 0%,var(--bg) 38%);color:var(--text)}h1,h2,h3,h4{margin:0}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px}.admin-shell{min-height:100vh;display:grid;grid-template-columns:220px minmax(0,1fr)}.admin-sidebar{background:#11273a;color:#d9e7f3;min-width:0;padding:24px 18px}.logo{font-size:22px;margin-bottom:18px}.menu-list{display:grid;gap:8px}.menu-item{color:#d9e7f3;text-decoration:none;padding:10px 12px;border-radius:8px}.menu-item.active,.menu-item:hover{background:#0e7490}.admin-main{min-width:0;padding:20px 24px}.admin-header{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 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