:root{font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.5;font-weight:400;color:#0f172a;background:#f8fafc;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:#f8fafc}#root{min-height:100vh}a{color:#1d4ed8;text-decoration:none;font-weight:600}a:hover{text-decoration:underline}.auth-page,.friends-page{min-height:100vh;display:grid;place-items:center;padding:24px}.auth-card{width:100%;max-width:420px;background:#fff;border:1px solid #e2e8f0;border-radius:12px;box-shadow:0 8px 20px #0f172a0f;padding:24px}.page-title{margin:0 0 8px;font-size:28px;line-height:1.2;color:#0f172a}.page-subtitle{margin:0 0 18px;color:#64748b;font-size:14px}.form-grid{display:grid;gap:8px}label{color:#334155;font-size:14px}input,select{width:100%;border:1px solid #cbd5e1;border-radius:10px;padding:10px 12px;font-size:14px;background:#fff}input:focus,select:focus{outline:2px solid #bfdbfe;outline-offset:1px;border-color:#60a5fa}button{border:1px solid transparent;border-radius:10px;padding:10px 14px;font-size:14px;font-weight:600;cursor:pointer;transition:all .16s ease}button:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:#1d4ed8;color:#fff}.btn-primary:hover:not(:disabled){background:#1e40af}.btn-secondary{background:#fff;border-color:#cbd5e1;color:#1e293b}.btn-secondary:hover:not(:disabled){background:#f8fafc}.btn-danger{background:#ef4444;color:#fff}.btn-danger:hover:not(:disabled){background:#dc2626}.form-footer{margin:14px 0 0;font-size:14px;color:#64748b}.banner-error,.banner-success{margin:0 0 12px;border-radius:10px;padding:10px 12px;font-size:14px}.banner-error{border:1px solid #fecaca;background:#fef2f2;color:#b91c1c}.banner-success{border:1px solid #bbf7d0;background:#f0fdf4;color:#166534}.field-error{margin:-2px 0 4px;color:#b91c1c;font-size:12px}.friends-page{place-items:start center}.friends-page>*:not(.dialog-mask){width:100%;max-width:920px}.friends-header{background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:14px 16px;margin-bottom:14px;display:flex;justify-content:flex-end;align-items:center;gap:12px}.header-actions{display:flex;align-items:center;gap:10px}.top-nav{display:flex;align-items:center;gap:6px;padding:4px;border-radius:10px;background:#f8fafc;border:1px solid #e2e8f0}.top-nav-btn{min-width:92px;padding:8px 12px;position:relative;color:#475569;border-color:transparent;background:transparent}.top-nav-btn:hover:not(:disabled){background:#eef2ff}.top-nav-btn.is-active{background:#1d4ed8;border-color:#1d4ed8;color:#fff}.top-nav-btn.is-active:hover:not(:disabled){background:#1e40af;border-color:#1e40af}.top-nav-btn.is-active:after{content:"";position:absolute;left:10px;right:10px;bottom:4px;height:2px;border-radius:2px;background:#fffffff2}.user-menu{position:relative;min-width:180px}.user-menu-trigger{display:flex;align-items:center;justify-content:space-between;gap:10px;width:100%;min-width:0;text-align:left;border-color:#cbd5e1;background:#fff;color:#0f172a}.user-menu-trigger:hover:not(:disabled){background:#f8fafc;border-color:#94a3b8}.user-menu-trigger:focus-visible{outline:2px solid #bfdbfe;outline-offset:1px}.user-menu-name{max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.user-menu-caret{color:#64748b;font-size:12px;line-height:1;transition:transform .14s ease}.user-menu-caret.is-open{transform:rotate(180deg)}.user-menu-dropdown{position:absolute;top:calc(100% + 8px);right:0;width:100%;min-width:0;background:#fff;border:1px solid #e2e8f0;border-radius:10px;box-shadow:0 12px 20px #0f172a14;padding:6px;z-index:20;animation:menu-drop-in .12s ease-out}.user-menu-meta{margin:0 0 4px;padding:8px 10px 6px;font-size:12px;color:#64748b;border-bottom:1px solid #e2e8f0}.user-menu-item{width:100%;border:0;border-radius:8px;background:transparent;color:#0f172a;text-align:left;padding:8px 10px;font-weight:500}.user-menu-item:hover:not(:disabled){background:#f8fafc}.user-menu-item-danger{color:#b91c1c}.user-menu-item-danger:hover:not(:disabled){background:#fef2f2}.friend-form{background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:16px;display:grid;gap:8px;margin-bottom:14px}.friend-form>.page-title{margin-bottom:4px;font-size:20px}.state-text{color:#475569;font-size:14px;margin:8px 0}.friend-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}.friend-item{background:#fff;border:1px solid #e2e8f0;border-radius:10px;padding:12px 14px;display:flex;justify-content:space-between;align-items:center;gap:10px}.friend-meta{display:grid;gap:2px}.friend-name{color:#0f172a;font-weight:600}.friend-time{color:#64748b;font-size:12px}.dialog-mask{position:fixed;inset:0;width:100vw;max-width:none;background:#0f172a66;display:grid;place-items:center;padding:16px}.dialog-card{width:min(420px,100%);background:#fff;border-radius:12px;border:1px solid #e2e8f0;padding:16px}.dialog-title{margin:0 0 12px;color:#0f172a;font-weight:600}.dialog-actions{display:flex;justify-content:flex-end;gap:8px}@keyframes menu-drop-in{0%{opacity:0;transform:translateY(-3px)}to{opacity:1;transform:translateY(0)}}@media(max-width:760px){.auth-page,.friends-page{padding:16px}.friends-header{padding:12px}.header-actions{flex-direction:column;align-items:stretch;width:100%}.top-nav{width:100%;display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:6px}.top-nav-btn{width:100%;min-width:0;text-align:center}.user-menu,.user-menu-trigger{width:100%}.user-menu-dropdown{left:0;right:auto;width:100%}.friend-item{flex-direction:column;align-items:stretch}}