:root{--color-bg: #eef2f7;--color-bg-soft: #f6f8fb;--color-surface: #ffffff;--color-surface-soft: #f8fafc;--color-text: #172033;--color-text-strong: #0f172a;--color-muted: #667085;--color-muted-soft: #98a2b3;--color-line: #d8e0ea;--color-line-soft: #e8eef5;--color-brand: #2563eb;--color-brand-hover: #1d4ed8;--color-brand-soft: #eff6ff;--color-info: #0f6b9a;--color-info-soft: #e8f5fb;--color-success: #15803d;--color-success-soft: #ecfdf3;--color-warning: #b7791f;--color-warning-soft: #fff7e6;--color-danger: #d92d20;--color-danger-soft: #fff1f0;--color-sidebar: #161d2b;--color-sidebar-active: #22304a;--radius-xs: 4px;--radius-sm: 6px;--radius-md: 8px;--shadow-soft: 0 1px 2px rgba(23, 32, 51, .06);--shadow-pop: 0 18px 42px rgba(23, 32, 51, .18);--focus-ring: 0 0 0 3px rgba(37, 99, 235, .16);--sidebar-width: 238px;--topbar-height: 68px}*{box-sizing:border-box}html{min-height:100%}body{min-height:100vh;margin:0;color:var(--color-text);background:var(--color-bg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,sans-serif;font-size:14px;line-height:1.5;letter-spacing:0;text-rendering:optimizeLegibility}button,input,select,textarea{font:inherit}button,input,select,textarea,a{-webkit-tap-highlight-color:transparent}button{color:inherit}input,select,textarea{width:100%;min-width:0;color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-line);border-radius:var(--radius-sm);outline:none;transition:border-color .16s ease,box-shadow .16s ease,background .16s ease}input:focus,select:focus,textarea:focus,button:focus-visible,.file-btn:focus-within{border-color:var(--color-brand);box-shadow:var(--focus-ring)}input::placeholder,textarea::placeholder{color:var(--color-muted-soft)}input:disabled,select:disabled,textarea:disabled,button:disabled{cursor:not-allowed}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(135deg,#2563eb14,#14b8a614),var(--color-bg)}.login-panel{width:392px;max-width:100%;padding:28px;border:1px solid var(--color-line-soft);border-radius:var(--radius-md);background:#fffffff5;box-shadow:var(--shadow-pop)}.login-brand{display:flex;align-items:center;gap:12px;margin-bottom:24px;padding-bottom:20px;border-bottom:1px solid var(--color-line-soft)}.login-field{display:grid;gap:7px;margin-top:14px;color:var(--color-muted);font-size:13px;font-weight:650}.login-field input{height:42px;padding:0 12px}.login-btn{width:100%;height:42px;display:inline-flex;align-items:center;justify-content:center;margin-top:20px;border:1px solid var(--color-brand);border-radius:var(--radius-sm);background:var(--color-brand);color:#fff;font-weight:750;cursor:pointer;transition:background .16s ease,border-color .16s ease,transform .16s ease}.login-btn:hover{background:var(--color-brand-hover);border-color:var(--color-brand-hover)}.login-btn:active{transform:translateY(1px)}.login-error,.alert{border:1px solid #f1b8b3;border-radius:var(--radius-sm);background:var(--color-danger-soft);color:var(--color-danger);font-size:13px;font-weight:650}.login-error{margin-top:12px;padding:10px 12px}.admin-shell{min-height:100vh;display:grid;grid-template-columns:var(--sidebar-width) minmax(0,1fr)}.sidebar{min-width:0;color:#d7dfeb;background:var(--color-sidebar);border-right:1px solid rgba(0,0,0,.18)}.brand{height:var(--topbar-height);display:flex;align-items:center;gap:12px;padding:0 18px;border-bottom:1px solid rgba(255,255,255,.08)}.brand-mark{width:36px;height:36px;flex:0 0 auto;display:grid;place-items:center;border-radius:var(--radius-md);background:#2563eb;color:#fff;font-weight:850;box-shadow:0 8px 20px #2563eb47}.brand-title{color:#fff;font-size:15px;font-weight:800;line-height:1.2}.brand-title.dark{color:var(--color-text-strong)}.brand-subtitle{margin-top:3px;color:#8f9bb0;font-size:12px;line-height:1.2}.menu{display:grid;gap:4px;padding:12px 10px}.menu-item{width:100%;min-width:0;height:42px;display:flex;align-items:center;gap:10px;padding:0 12px;border:0;border-radius:var(--radius-sm);background:transparent;color:#cbd5e1;cursor:pointer;text-align:left;transition:background .16s ease,color .16s ease}.menu-item:hover{background:#ffffff12;color:#fff}.menu-item.active{color:#fff;background:var(--color-sidebar-active);box-shadow:inset 3px 0 #38bdf8}.menu-icon{width:24px;height:24px;flex:0 0 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