*,:before,:after{box-sizing:border-box}:root{--color-bg:#0a0a0a;--color-surface:#1c1c1e;--color-surface-2:#2c2c2e;--color-surface-3:#3a3a3c;--color-sidebar:#111;--color-border:#ffffff1a;--color-border-focus:#ffffff40;--color-accent:#0a84ff;--color-accent-dim:#0a84ff2e;--color-bubble-user:#0a84ff;--color-bubble-ai:#2c2c2e;--color-text-primary:#fff;--color-text-secondary:#ebebf5;--color-text-tertiary:#8e8e93;--color-text-danger:#ff453a;--radius-bubble:18px;--radius-container:12px;--radius-pill:999px;--radius-sm:6px;--radius-md:8px;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--sidebar-width:260px;--transition-fast:.15s ease;--transition-med:.25s ease;--transition-sidebar:.28s cubic-bezier(.4, 0, .2, 1);--font-base:system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}body{background:var(--color-bg);color:var(--color-text-primary);font-family:var(--font-base);margin:0}button{font-family:inherit}#root{width:100%}button:focus-visible,textarea:focus-visible,input:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.app-layout{height:100vh;display:flex}.conversation-list{background:var(--color-sidebar);border-right:1px solid var(--color-border);min-width:0;width:var(--sidebar-width);padding:var(--space-3);gap:var(--space-1);will-change:transform, width;transition:width var(--transition-sidebar), opacity var(--transition-sidebar), padding var(--transition-sidebar);flex-direction:column;flex-shrink:0;display:flex;overflow:hidden}.app-layout--sidebar-closed .conversation-list{opacity:0;pointer-events:none;width:0;padding:0}.conversation-list__items{gap:var(--space-1);flex-direction:column;flex:1;min-height:0;display:flex;overflow-y:auto}.conversation-list__plan{color:var(--color-text-tertiary);text-transform:capitalize;padding:var(--space-2) var(--space-2);border-top:1px solid var(--color-border);margin-top:var(--space-1);letter-spacing:.3px;font-size:11px;font-weight:600}.conversation-list__new{color:#000;border-radius:var(--radius-pill);padding:var(--space-2) var(--space-3);cursor:pointer;margin-bottom:var(--space-2);white-space:nowrap;transition:opacity var(--transition-fast);background:#fff;border:none;font-size:13px;font-weight:700}.conversation-list__new:hover{opacity:.85}.conversation-list__item{border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition-fast);align-items:center;display:flex}.conversation-list__item:hover{background:var(--color-surface-2)}.conversation-list__item--active{background:var(--color-accent-dim)}.conversation-list__item--active .conversation-list__title-btn{color:var(--color-accent)}.conversation-list__title-btn{min-width:0;color:var(--color-text-secondary);text-align:left;padding:var(--space-2) var(--space-3);cursor:pointer;white-space:nowrap;text-overflow:ellipsis;background:0 0;border:none;flex:1;font-size:13px;overflow:hidden}.conversation-list__title-btn:active{background:var(--color-surface-3)}.conversation-list__delete{opacity:0;color:var(--color-text-tertiary);cursor:pointer;padding:var(--space-1) var(--space-2);border-radius:var(--radius-sm);transition:opacity var(--transition-fast), color var(--transition-fast);background:0 0;border:none;flex-shrink:0;font-size:14px;line-height:1}.conversation-list__item:hover .conversation-list__delete{opacity:1}.conversation-list__delete:hover{color:var(--color-text-danger)}.sidebar-toggle{color:var(--color-text-tertiary);cursor:pointer;padding:var(--space-1) var(--space-2);border-radius:var(--radius-sm);transition:color var(--transition-fast), opacity var(--transition-fast);background:0 0;border:none;flex-shrink:0;font-size:20px;line-height:1}.sidebar-toggle:hover{color:var(--color-text-primary)}.sidebar-toggle:active{opacity:.6}.sidebar-backdrop{display:none}.chat{background:var(--color-bg);flex-direction:column;flex:1;min-width:0;display:flex}.chat__header{align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);background:var(--color-surface);border-bottom:1px solid var(--color-border);flex-shrink:0;display:flex}.chat__title{color:var(--color-text-primary);letter-spacing:-.2px;flex:1;font-size:17px;font-weight:700}.chat__header-right{align-items:center;gap:var(--space-3);display:flex}.token-counter{color:var(--color-text-tertiary);font-size:11px}.logout-btn{color:var(--color-text-primary);cursor:pointer;transition:opacity var(--transition-fast);background:0 0;border:none;padding:0;font-size:13px;font-weight:700;text-decoration:none}.logout-btn:hover{opacity:.7}.message-list{min-width:0;padding:var(--space-4) var(--space-5);gap:var(--space-3);scrollbar-width:thin;scrollbar-color:var(--color-surface-3) transparent;flex-direction:column;flex:1;display:flex;overflow-y:auto}.message-list::-webkit-scrollbar{width:6px}.message-list::-webkit-scrollbar-thumb{background:var(--color-surface-3);border-radius:999px}.message{align-items:flex-end;gap:var(--space-2);display:flex}.message--user{justify-content:flex-end}.message--assistant{justify-content:flex-start}.message__bubble{border-radius:var(--radius-bubble);white-space:pre-wrap;word-break:break-word;max-width:75%;padding:10px 14px;font-size:15px;line-height:1.5}.message--user .message__bubble{background:var(--color-bubble-user);color:#fff;border-bottom-right-radius:4px}.message--assistant .message__bubble{background:var(--color-bubble-ai);color:var(--color-text-primary);border-bottom-left-radius:4px}.message__bubble p{margin:0}.message__bubble p+p{margin-top:.5em}.message__bubble pre{border-radius:var(--radius-sm);padding:var(--space-2) var(--space-3);border:1px solid 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16px;display:flex}.typing-dot{background:var(--color-text-tertiary);will-change:transform, opacity;border-radius:50%;width:8px;height:8px;animation:1.2s ease-in-out infinite typing-bounce;display:inline-block}.typing-dot:first-child{animation-delay:0s}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes typing-bounce{0%,60%,to{opacity:.4;transform:translateY(0)}30%{opacity:1;transform:translateY(-6px)}}.message-input-wrapper{padding:var(--space-3) var(--space-4);gap:var(--space-2);border-top:1px solid var(--color-border);background:var(--color-bg);flex-direction:column;flex-shrink:0;display:flex}.message-input{align-items:flex-end;gap:var(--space-2);background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-pill);padding:var(--space-2) var(--space-2) var(--space-2) var(--space-3);transition:border-color var(--transition-fast);display:flex}.message-input:focus-within{border-color:var(--color-border-focus)}.message-input textarea{resize:none;font-size:15px;font-family:var(--font-base);color:var(--color-text-primary);background:0 0;border:none;outline:none;flex:1;max-height:120px;padding:6px 0;line-height:1.5;overflow-y:auto}.message-input textarea::placeholder,.message-input textarea:disabled{color:var(--color-text-tertiary)}.message-input__send-btn{color:#000;cursor:pointer;width:34px;min-width:34px;height:34px;transition:opacity var(--transition-fast);background:#fff;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-self:flex-end;align-items:center;margin-bottom:4px;display:flex}.message-input__send-btn:disabled{background:var(--color-surface-3);color:var(--color-text-tertiary);cursor:not-allowed;opacity:1}.message-input__send-btn:not(:disabled):hover{opacity:.85}.message-input__attach-btn{cursor:pointer;padding:var(--space-1);color:var(--color-text-tertiary);transition:color var(--transition-fast);background:0 0;border:none;flex-shrink:0;align-self:flex-end;align-items:center;margin-bottom:6px;line-height:1;display:flex}.message-input__attach-btn:hover{color:var(--color-text-primary)}.message-input__attach-btn:disabled{opacity:.35;cursor:not-allowed}.message-input__file-hidden{display:none}.upload-error{color:var(--color-text-danger);margin:0;font-size:12px}.image-preview-strip{gap:var(--space-2);padding:0 var(--space-1);display:flex}.image-preview-strip__item{display:inline-flex;position:relative}.image-preview-strip__thumb{object-fit:cover;border-radius:var(--radius-md);border:1px solid var(--color-border);width:56px;height:56px}.image-preview-strip__remove{background:var(--color-surface-3);width:18px;height:18px;color:var(--color-text-primary);cursor:pointer;border:none;border-radius:50%;justify-content:center;align-items:center;padding:0;font-size:12px;line-height:1;display:flex;position:absolute;top:-5px;right:-5px}.file-preview-strip{gap:var(--space-2);padding:0 var(--space-1);display:flex}.file-preview-strip__item{align-items:center;gap:var(--space-1);background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-1) var(--space-2);max-width:260px;display:inline-flex}.file-preview-strip__icon{flex-shrink:0;font-size:14px}.file-preview-strip__name{color:var(--color-text-secondary);white-space:nowrap;text-overflow:ellipsis;max-width:200px;font-size:13px;overflow:hidden}.file-preview-strip__remove{background:var(--color-surface-3);width:16px;height:16px;color:var(--color-text-primary);cursor:pointer;margin-left:var(--space-1);border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;padding:0;font-size:11px;line-height:1;display:flex}.auth{background:var(--color-bg);width:100%;min-height:100vh;padding:var(--space-4);justify-content:center;align-items:center;display:flex}.auth__box{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-container);width:100%;max-width:360px;padding:var(--space-6) 32px}.auth__title{margin:0 0 var(--space-6);color:var(--color-text-primary);letter-spacing:-.4px;font-size:24px;font-weight:700}.auth__form{gap:var(--space-3);flex-direction:column;display:flex}.auth__form input{background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:11px var(--space-3);font-size:15px;font-family:var(--font-base);color:var(--color-text-primary);transition:border-color var(--transition-fast);outline:none}.auth__form input::placeholder{color:var(--color-text-tertiary)}.auth__form input:focus{border-color:var(--color-accent)}.auth__form input:disabled{opacity:.5}.auth__form button{background:var(--color-accent);color:#fff;border-radius:var(--radius-md);cursor:pointer;transition:opacity var(--transition-fast);border:none;padding:11px;font-family:inherit;font-size:15px;font-weight:600}.auth__form button:hover{opacity:.88}.auth__form button:disabled{background:var(--color-surface-3);color:var(--color-text-tertiary);cursor:not-allowed;opacity:1}.auth__error{color:var(--color-text-danger);margin:0;font-size:13px}.auth__link{color:var(--color-text-tertiary);margin:var(--space-4) 0 0;text-align:center;font-size:14px}.auth__link a{color:var(--color-accent);text-decoration:none}.auth__link a:hover{text-decoration:underline}@media (width<=767px){.app-layout{max-width:100%}.conversation-list{z-index:200;height:100vh;width:var(--sidebar-width);transition:transform var(--transition-sidebar);opacity:1;pointer-events:auto;position:fixed;top:0;left:0;transform:translate(-100%);box-shadow:4px 0 24px #00000080}.app-layout--sidebar-open .conversation-list{transform:translate(0)}.sidebar-backdrop{z-index:199;background:#0000008c;animation:.2s fade-in;display:block;position:fixed;inset:0}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.message__bubble{max-width:88%}.message-list{padding:var(--space-3)}.message-input-wrapper{padding:var(--space-2) var(--space-3)}.app-layout--sidebar-closed .conversation-list{width:var(--sidebar-width);opacity:1;pointer-events:auto;padding:var(--space-3)}}@media (pointer:coarse){.conversation-list__delete,.message__actions{opacity:1}}.ai-accent{color:#7dd3fc;font-style:italic}.chat__title-tagline{color:var(--color-text-primary);font-size:14px;font-weight:400}@media (width<=767px){.chat__title-tagline{display:none}}.chat__landing{justify-content:center;align-items:center;gap:var(--space-4);padding:var(--space-6) var(--space-4);flex-direction:column;flex:1;padding-bottom:10vh;display:flex}.chat__landing-logo{letter-spacing:-2px;color:var(--color-text-primary);-webkit-user-select:none;user-select:none;font-size:clamp(52px,10vw,80px);font-weight:800;line-height:1}.chat__landing-tagline{color:var(--color-text-tertiary);text-align:center;margin:0;font-size:18px}.chat__landing-input{width:100%;max-width:680px}.chat__landing-input .message-input-wrapper{border-top:none;padding-left:0;padding-right:0}.mermaid-diagram{padding:var(--space-3) 0;contain:layout paint;justify-content:center;max-width:100%;display:flex;overflow-x:auto}.mermaid-diagram svg{max-width:100%;height:auto;display:block}.settings-menu{margin-bottom:var(--space-4);flex-direction:column;gap:2px;display:flex}.settings-menu__item{padding:14px var(--space-3);border-radius:var(--radius-md);background:var(--color-surface-2);color:var(--color-text-primary);transition:background var(--transition-fast);justify-content:space-between;align-items:center;font-size:15px;text-decoration:none;display:flex}.settings-menu__item:hover{background:var(--color-surface-3)}.settings-menu__chevron{color:var(--color-text-tertiary);font-size:18px;line-height:1}.usage-plan-label{color:var(--color-text-tertiary);text-transform:capitalize;margin:0 0 var(--space-4) 0;letter-spacing:.3px;font-size:12px;font-weight:600}.usage-section{margin-bottom:var(--space-5)}.usage-section__header{margin-bottom:var(--space-2);justify-content:space-between;align-items:baseline;display:flex}.usage-section__title{color:var(--color-text-primary);font-size:14px;font-weight:600}.usage-section__numbers{color:var(--color-text-primary);font-size:13px;font-weight:600}.usage-dim{color:var(--color-text-tertiary);font-weight:400}.usage-bar{background:var(--color-surface-3);height:6px;margin-bottom:var(--space-2);border-radius:999px;overflow:hidden}.usage-bar__fill{background:#7dd3fc;border-radius:999px;height:100%;transition:width .4s}.usage-section__sub{color:var(--color-text-tertiary);margin:0;font-size:12px}