:root{--bg-color:#fff;--text-primary:#111;--text-secondary:#666;--accent-color:#000;--border-color:#eee;--card-bg:#fafafa;--success-bg:#f0fdf4;--success-text:#166534;--error-bg:#fef2f2;--error-text:#991b1b;background-color:var(--bg-color);color:var(--text-primary);font-family:Inter,Source Han Sans CN,system-ui,sans-serif}@media (prefers-color-scheme:dark){:root{--bg-color:#000;--text-primary:#fff;--text-secondary:#a1a1a1;--accent-color:#fff;--border-color:#222;--card-bg:#111;--success-bg:#064e3b;--success-text:#34d399;--error-bg:#450a0a;--error-text:#f87171}}*{box-sizing:border-box;margin:0;padding:0}body{flex-direction:column;min-height:100vh;display:flex}.app-wrapper{flex-direction:column;width:100%;max-width:1000px;min-height:100vh;margin:0 auto;padding:0 2rem;display:flex}.auth-wall{background-color:var(--bg-color);justify-content:center;align-items:center;min-height:100vh;display:flex}.auth-card{border:1px solid var(--border-color);background:var(--card-bg);text-align:center;border-radius:20px;width:100%;max-width:400px;padding:3rem}.auth-card .logo{margin-bottom:2rem;font-size:2rem}.auth-card h2{margin-bottom:.5rem;font-size:1.5rem}.auth-card p{color:var(--text-secondary);margin-bottom:2rem}.auth-card input{border:1px solid var(--border-color);background:var(--bg-color);width:100%;color:var(--text-primary);text-align:center;border-radius:8px;margin-bottom:1rem;padding:1rem;font-size:1rem}.auth-card input:focus{border-color:var(--text-primary);outline:none}.nav-link{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;padding:.4rem 0;font-size:1rem;font-weight:500;transition:color .15s,border-color .15s}.nav-link:hover{color:var(--text-primary)}.nav-link.active{color:var(--text-primary);border-bottom-color:var(--accent-color)}.error-msg{color:var(--error-text);margin-bottom:1rem;font-size:.875rem}.logo{letter-spacing:-.05em;font-size:1.5rem;font-weight:800}.status-tag{border:1px solid var(--border-color);color:var(--text-secondary);border-radius:100px;padding:4px 12px;font-size:.75rem}.main-content{flex:1;padding:4rem 0}.hero-section{margin-bottom:4rem}.title{letter-spacing:-.02em;margin-bottom:1.5rem;font-size:3.5rem;font-weight:700;line-height:1.1}.description{color:var(--text-secondary);font-size:1.25rem;line-height:1.6}.test-card{background:var(--card-bg);border:1px solid var(--border-color);border-radius:16px;max-width:500px;padding:2rem}.card-header{align-items:center;gap:12px;margin-bottom:.5rem;display:flex}.card-header 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pre{background:#0000000d;border-radius:4px;margin-top:8px;padding:8px;font-size:.75rem}.footer{border-top:1px solid var(--border-color);height:100px;color:var(--text-secondary);justify-content:center;align-items:center;font-size:.875rem;display:flex}@media (width<=768px){.title{font-size:2.5rem}}.studio-app-wrapper{flex-direction:column;width:100%;height:100vh;display:flex}.studio-main{flex:1;min-height:0;display:flex;overflow:hidden}.studio-layout{width:100%;height:100%;display:flex;overflow:hidden}.sidebar{border-right:1px solid var(--border-color);background:var(--card-bg);flex-direction:column;width:240px;min-width:240px;display:flex;overflow:hidden}.sidebar-top{flex-direction:column;flex:1;gap:1rem;padding:1rem;display:flex;overflow-y:auto}.sidebar-logo{letter-spacing:-.05em;border-bottom:1px solid var(--border-color);padding-bottom:.5rem;font-size:1.25rem;font-weight:800}.sidebar-section{flex-direction:column;gap:.5rem;display:flex}.sidebar-label{text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary);font-size:.7rem;font-weight:600}.sidebar-space-row{align-items:center;gap:4px;display:flex}.sidebar-select{border:1px solid var(--border-color);background:var(--bg-color);color:var(--text-primary);border-radius:6px;flex:1;min-width:0;padding:.4rem .5rem;font-size:.875rem}.sidebar-add-btn{border:1px solid var(--border-color);background:var(--bg-color);width:28px;height:28px;color:var(--text-primary);cursor:pointer;border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;font-size:1rem;display:flex}.sidebar-add-btn:hover{background:var(--border-color)}.sidebar-input{border:1px solid var(--border-color);background:var(--bg-color);width:100%;color:var(--text-primary);border-radius:6px;padding:.4rem .5rem;font-size:.875rem}.sidebar-input:focus{border-color:var(--accent-color);outline:none}.sidebar-create-space{flex-direction:column;gap:4px;display:flex}.sidebar-action-btn{border:1px solid var(--border-color);background:var(--bg-color);color:var(--text-primary);cursor:pointer;border-radius:6px;flex:1;padding:.3rem .5rem;font-size:.8rem}.sidebar-action-btn.primary{background:var(--accent-color);color:var(--bg-color);border-color:var(--accent-color)}.sidebar-action-btn:disabled{opacity:.5;cursor:not-allowed}.sidebar-tree-placeholder{opacity:.5;pointer-events:none;-webkit-user-select:none;user-select:none}.sidebar-placeholder-item{color:var(--text-secondary);padding:.2rem 0;font-size:.8rem}.sidebar-placeholder-item.indent{padding-left:1.25rem}.sidebar-bottom{border-top:1px solid var(--border-color);flex-shrink:0;padding:.75rem 1rem}.sidebar-user-row{align-items:center;gap:4px;display:flex}.sidebar-user-row .sidebar-user-btn{flex:1;min-width:0}.sidebar-user-btn{cursor:pointer;width:100%;color:var(--text-primary);text-align:left;background:0 0;border:none;border-radius:6px;align-items:center;gap:8px;padding:.4rem;display:flex}.sidebar-user-btn:hover{background:var(--border-color)}.sidebar-signout-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:6px;flex-shrink:0;padding:.4rem;font-size:1rem;line-height:1}.sidebar-signout-btn:hover{background:var(--border-color);color:var(--text-primary)}.sidebar-user-avatar{flex-shrink:0;font-size:1.1rem}.sidebar-user-name{text-overflow:ellipsis;white-space:nowrap;font-size:.875rem;font-weight:500;overflow:hidden}.studio-content-area{background:var(--bg-color);flex:1;justify-content:center;align-items:center;display:flex;overflow:auto}.studio-content-placeholder{color:var(--text-secondary);text-align:center;flex-direction:column;align-items:center;gap:.75rem;display:flex}.agent-panel{border-left:1px solid var(--border-color);background:var(--card-bg);flex-direction:column;width:340px;min-width:340px;display:flex;overflow:hidden}.agent-panel-header{border-bottom:1px solid var(--border-color);flex-shrink:0;justify-content:space-between;align-items:center;padding:.75rem 1rem;display:flex}.agent-panel-title{font-size:.9rem;font-weight:600}.agent-model-select{border:1px solid var(--border-color);background:var(--bg-color);color:var(--text-primary);border-radius:6px;padding:.25rem .5rem;font-size:.75rem}.agent-new-thread-btn{border:1px solid var(--border-color);background:var(--bg-color);color:var(--text-primary);cursor:pointer;border-radius:6px;padding:.25rem .6rem;font-size:.75rem}.agent-messages{flex-direction:column;flex:1;gap:1rem;min-height:0;padding:1rem;display:flex;overflow-y:auto}.agent-empty-state{height:100%;color:var(--text-secondary);text-align:center;justify-content:center;align-items:center;font-size:.875rem;display:flex}.agent-msg-row{width:100%;display:flex}.agent-msg-row.user{justify-content:flex-end}.agent-msg-bubble{max-width:85%}.agent-role-label{color:var(--text-secondary);margin-bottom:4px;font-size:.7rem;font-weight:600;display:block}.agent-msg-row.user .agent-role-label{text-align:right}.agent-msg-content{background:var(--bg-color);border:1px solid var(--border-color);white-space:pre-wrap;word-break:break-word;border-radius:10px;padding:.6rem .875rem;font-size:.875rem;line-height:1.6}.agent-msg-row.user .agent-msg-content{background:var(--accent-color);color:var(--bg-color);border-color:var(--accent-color)}.agent-input-form{border-top:1px solid var(--border-color);flex-shrink:0;gap:.5rem;padding:.75rem;display:flex}.agent-input{border:1px solid var(--border-color);background:var(--bg-color);color:var(--text-primary);border-radius:8px;flex:1;min-width:0;padding:.6rem .875rem;font-size:.875rem}.agent-input:focus{border-color:var(--accent-color);outline:none}.agent-send-btn{border-radius:8px;flex-shrink:0;width:36px;height:36px;padding:0;font-size:1rem}.cursor-blink{margin-left:2px;animation:1s step-end infinite blink}@keyframes blink{50%{opacity:0}}.tree-menu-item{cursor:pointer;text-align:left;width:100%;color:var(--text-primary);white-space:nowrap;background:0 0;border:none;border-radius:4px;padding:.3rem .5rem;font-size:.8rem;display:block}.tree-menu-item:hover:not(:disabled){background:var(--border-color)}.tree-menu-item:disabled{opacity:.4;cursor:not-allowed}.tree-menu-item--danger{color:var(--error-text)}