*{box-sizing:border-box}html,body,#root{height:100%;margin:0;padding:0}:root{--bg:#f7f7f8;--surface:#fff;--surface-2:#f0f0f2;--text-primary:#1c1c1e;--text-secondary:#6e6e73;--text-tertiary:#98989d;--accent:#1e3358;--accent-soft:#eef1f7;--hairline:#3c3c431f;--hairline-strong:#3c3c4338;--link:#1d4ed8;--danger:#b91c1c;--success:#166534;--radius-s:8px;--radius-m:14px;--radius-l:20px;--sans:-apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", Inter, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;--mono:ui-monospace, "SF Mono", SFMono-Regular, Consolas, monospace}body{font-family:var(--sans);color:var(--text-primary);background:var(--bg);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px;line-height:1.5}.app{background:var(--bg);flex-direction:column;height:100dvh;display:flex;overflow:hidden}.header{z-index:10;min-height:52px;padding:8px 16px;padding-top:max(8px, env(safe-area-inset-top));-webkit-backdrop-filter:saturate(180%)blur(20px);backdrop-filter:saturate(180%)blur(20px);border-bottom:1px solid var(--hairline);background:#ffffffd9;flex:none;justify-content:space-between;align-items:center;gap:12px;display:flex;position:relative}.header-brand{text-align:left;flex-direction:column;min-width:0;display:flex}.header h1{letter-spacing:-.2px;color:var(--text-primary);margin:0;font-size:17px;font-weight:600;line-height:1.25}.header p{color:var(--text-tertiary);white-space:nowrap;text-overflow:ellipsis;margin:0;font-size:11px;line-height:1.3;overflow:hidden}.profile-wrapper{flex:none;position:relative}.profile-button{border:1px solid var(--hairline);background:var(--surface);color:var(--text-primary);cursor:pointer;border-radius:999px;padding:6px 12px;font-family:inherit;font-size:13px}.profile-button:hover{background:var(--surface-2)}.profile-menu{background:var(--surface);border:1px solid var(--hairline);border-radius:var(--radius-m);z-index:50;min-width:170px;position:absolute;top:calc(100% + 8px);right:0;overflow:hidden;box-shadow:0 8px 24px #00000014}.profile-menu button{text-align:left;cursor:pointer;width:100%;color:var(--text-primary);background:0 0;border:none;padding:10px 14px;font-family:inherit;font-size:13px}.profile-menu button:hover{background:var(--surface-2)}.profile-menu button:disabled{color:var(--text-tertiary);cursor:not-allowed;background:0 0}.modal-backdrop{z-index:100;background:#0000004d;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.profile-modal{background:var(--surface);border:1px solid var(--hairline);border-radius:var(--radius-l);text-align:left;width:100%;max-width:420px;padding:20px;box-shadow:0 16px 40px #0000001f}.modal-header{justify-content:space-between;align-items:center;margin-bottom:14px;font-size:16px;display:flex}.modal-header button{cursor:pointer;color:var(--text-primary);background:0 0;border:none;font-size:22px}.profile-row{justify-content:space-between;gap:16px;margin-bottom:10px;font-size:14px;display:flex}.profile-row span{color:var(--text-secondary)}.account-modal{max-height:min(720px,100dvh - 32px);overflow-y:auto}.account-modal-section{border-top:1px solid var(--hairline);padding:14px 0}.account-modal-section:first-of-type{border-top:none;padding-top:0}.account-modal-section:last-child{padding-bottom:0}.account-modal-section h2{color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.05em;margin:0 0 10px;font-size:12px;font-weight:700}.account-modal-section p,.account-modal-section ul{color:var(--text-secondary);margin:8px 0 0;font-size:13px;line-height:1.5}.account-modal-section ul{padding-left:18px}.account-modal-section li{margin-bottom:4px}.auth-card{background:var(--surface);border:1px solid var(--hairline);border-radius:var(--radius-l);text-align:left;width:100%;max-width:400px;margin:48px auto;padding:24px}.message-label{text-transform:uppercase;letter-spacing:.05em;color:var(--text-tertiary);margin-bottom:12px;font-size:11px;font-weight:600}.chat-container{-webkit-overflow-scrolling:touch;flex:1;min-height:0;padding:20px 16px 12px;overflow-y:auto}.message-row{align-items:flex-start;gap:10px;width:100%;max-width:760px;margin:0 auto 16px;display:flex}.message-row.tina{justify-content:flex-start}.message-row.user{justify-content:flex-end}.tina-indicator{background:var(--accent);color:#fff;-webkit-user-select:none;user-select:none;border-radius:50%;flex-shrink:0;place-items:center;width:24px;height:24px;margin-top:8px;font-size:11px;font-weight:600;display:grid}.message-box{border-radius:var(--radius-l);background:var(--surface);border:1px solid var(--hairline);text-align:left;min-width:0;color:var(--text-primary);overflow-wrap:anywhere;white-space:pre-wrap;padding:12px 16px;font-size:15px;line-height:1.6}.message-row.tina .message-box{border-bottom-left-radius:var(--radius-s)}.message-row.user .message-box{background:var(--accent);color:#fff;border-bottom-right-radius:var(--radius-s);border:none;max-width:75%}.message-markdown{white-space:normal;line-height:1.65}.message-markdown h1{color:var(--text-primary);border-bottom:1px solid var(--hairline);margin:0 0 10px;padding-bottom:6px;font-size:1.2em;font-weight:700}.message-markdown h2{color:var(--text-primary);text-transform:uppercase;letter-spacing:.03em;margin:14px 0 4px;font-size:1em;font-weight:700}.message-markdown p{margin:0 0 8px}.message-markdown ul,.message-markdown ol{margin:4px 0 8px;padding-left:20px}.message-markdown li{margin-bottom:4px}.message-markdown strong{color:var(--text-primary);font-weight:700}.message-markdown em{color:var(--text-secondary);font-style:italic}.message-markdown hr{border:none;border-top:1px solid var(--hairline);margin:12px 0}.message-markdown code{background:var(--surface-2);font-size:.88em;font-family:var(--mono);border-radius:4px;padding:1px 5px}.sources{border-top:1px solid var(--hairline);color:var(--text-secondary);text-align:left;margin-top:12px;padding-top:10px;font-size:12px}.sources strong{text-transform:uppercase;letter-spacing:.04em;color:var(--text-tertiary);margin-bottom:5px;font-size:11px;font-weight:600;display:block}.sources ol{margin:5px 0 0;padding-left:18px}.sources a{color:var(--link);word-break:break-word;text-decoration:underline}.sources a:hover{color:#1e3a8a}.source-chips{flex-wrap:wrap;gap:8px;margin-top:8px;display:flex}.source-chip{border:1px solid var(--hairline-strong);color:var(--text-secondary);white-space:nowrap;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:500;display:inline-block}a.source-chip{color:var(--link);cursor:pointer;border-color:#1d4ed866;text-decoration:none;transition:background .15s,border-color .15s}a.source-chip:hover{background:var(--accent-soft);border-color:var(--link)}.source-list{margin-top:8px}.source-list-item{margin-bottom:6px;line-height:1.45}.source-list-item a{color:var(--link);word-break:break-word;cursor:pointer;text-decoration:underline}.source-list-item span{color:var(--text-secondary);word-break:break-word}.educational-sources{border-top:1px solid var(--hairline);text-align:left;margin-top:12px;padding-top:10px}.educational-sources-label{color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:8px;font-size:11px;font-weight:600;display:block}.educational-source-chips{flex-wrap:wrap;gap:6px;display:flex}.educational-source-chip{border:1px solid var(--hairline-strong);background:var(--surface);color:var(--text-secondary);cursor:pointer;white-space:nowrap;border-radius:999px;padding:3px 10px;font-size:11.5px;font-weight:500;text-decoration:none;transition:background .15s,border-color .15s;display:inline-block}.educational-source-chip:hover{background:var(--accent-soft);border-color:var(--link);color:var(--link)}.educational-source-chip.disabled{cursor:default;color:var(--text-tertiary);background:var(--surface-2)}.educational-source-chip.disabled:hover{border-color:var(--hairline-strong)}.educational-source-group{margin-bottom:8px}.educational-source-group-title{color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.04em;margin-bottom:5px;font-size:10.5px;font-weight:600;display:block}.input-container{background:var(--bg);flex:none;padding:8px 16px 0}.input-box{background:var(--surface);border:1px solid var(--hairline-strong);border-radius:24px;align-items:flex-end;gap:8px;width:100%;max-width:760px;margin:0 auto;padding:6px 6px 6px 16px;transition:border-color .15s,box-shadow .15s;display:flex;box-shadow:0 1px 2px #0000000a}.input-box:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px #1e335814}.input-box textarea{resize:none;min-width:0;color:var(--text-primary);background:0 0;border:none;outline:none;flex:1;max-height:160px;padding:8px 0;font-family:inherit;font-size:15px;line-height:1.45}.input-box textarea::placeholder{color:var(--text-tertiary)}.send-button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:50%;flex:none;place-items:center;width:36px;height:36px;transition:background .15s,opacity .15s;display:grid}.send-button:hover:not(:disabled){opacity:.9}.send-button:disabled{background:var(--surface-2);color:var(--text-tertiary);cursor:default}.send-spinner{border:2px solid var(--hairline-strong);border-top-color:var(--text-secondary);border-radius:50%;width:14px;height:14px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.footer{padding:6px 16px calc(6px + env(safe-area-inset-bottom));text-align:center;background:var(--bg);color:var(--text-tertiary);flex:none;justify-content:center;align-items:center;font-size:11px;display:flex}.typing-status{max-width:min(68vw,360px);color:var(--text-secondary);white-space:normal;overflow-wrap:anywhere;padding:2px 0;font-size:14px;line-height:1.45;animation:1s ease-in-out typing-status-fade;display:inline-block}@keyframes typing-status-fade{0%{opacity:.55}to{opacity:1}}@media (width<=600px){.chat-container{padding:16px 12px 8px}.message-row{gap:8px;margin-bottom:14px}.message-row.user .message-box{max-width:85%}.message-box{padding:11px 14px}.input-container{padding:6px 10px 0}.footer{padding-top:5px;font-size:10px}}@media (prefers-reduced-motion:reduce){.typing-status{animation:none}.send-spinner{animation-duration:1.6s}.input-box,.send-button,.source-chip,.educational-source-chip{transition:none}}