:root{--primary:#4f46e5;--primary-light:#818cf8;--primary-bg:#4f46e514;--primary-border:#4f46e54d;--success:#16a34a;--success-bg:#16a34a14;--danger:#dc2626;--danger-bg:#dc262614;--warning:#f59e0b;--text:#374151;--text-light:#6b7280;--text-heading:#111827;--bg:#f9fafb;--bg-card:#fff;--border:#e5e7eb;--shadow:0 1px 3px #0000001a, 0 1px 2px #0000000f;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -2px #0000000d;--radius:12px;--radius-sm:8px;--sidebar-width:280px;color:var(--text);background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.6}*{box-sizing:border-box;margin:0;padding:0}body{min-height:100vh}#root{width:100%;min-height:100vh}.app-header{background:var(--bg-card);border-bottom:1px solid var(--border);z-index:100;align-items:center;gap:12px;min-height:52px;padding:10px 16px;display:flex;position:sticky;top:0}.header-left{flex-shrink:0;align-items:center;gap:10px;display:flex}.header-logo{width:auto;height:28px}.header-title{color:var(--text-heading);white-space:nowrap;font-size:15px;font-weight:600}.header-slogan{text-align:center;color:var(--text-light);letter-spacing:.3px;white-space:nowrap;text-overflow:ellipsis;flex:1;font-size:12px;font-style:italic;overflow:hidden}.header-right{flex-shrink:0;align-items:center;gap:8px;display:flex}.header-user{color:var(--text-light);background:var(--primary-bg);white-space:nowrap;border-radius:12px;padding:2px 8px;font-size:12px}.menu-btn{border:1px solid var(--border);color:var(--text);cursor:pointer;border-radius:var(--radius-sm);background:0 0;padding:4px 8px;font-size:18px;line-height:1}.menu-btn:hover{background:var(--primary-bg)}.lang-select{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-card);color:var(--text);cursor:pointer;outline:none;padding:4px 6px;font-size:12px}.lang-select:focus{border-color:var(--primary)}.login-screen{flex-direction:column;justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.login-lang{position:absolute;top:16px;right:16px}.login-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);text-align:center;width:100%;max-width:400px;box-shadow:var(--shadow-lg);padding:40px 32px}.login-logo{width:180px;height:auto;margin-bottom:12px}.login-slogan{color:var(--text-light);letter-spacing:.5px;margin-bottom:20px;font-size:13px;font-style:italic}.login-card h1{color:var(--text-heading);margin-bottom:8px;font-size:22px}.login-card p{color:var(--text-light);margin-bottom:24px;font-size:14px}.login-input{border:2px solid var(--border);border-radius:var(--radius-sm);box-sizing:border-box;outline:none;width:100%;padding:12px 16px;font-size:16px;transition:border-color .2s}.login-input:focus{border-color:var(--primary)}.btn{border-radius:var(--radius-sm);cursor:pointer;border:none;padding:10px 20px;font-size:14px;font-weight:500;transition:all .2s}.btn-primary{background:var(--primary);color:#fff;padding:12px 32px;font-size:15px}.btn-primary:hover{background:#4338ca}.login-btn{width:100%;margin-top:16px}.login-btn:disabled{opacity:.4;cursor:not-allowed}.handbook-layout{flex-direction:column;min-height:100vh;display:flex}.handbook-body{flex:1;min-height:0;display:flex}.sidebar{width:var(--sidebar-width);background:var(--bg-card);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;height:calc(100vh - 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