/* Same tokens as the sandbox; route recommendations carry the hierarchy. */
:root{color-scheme:light;font-family:"Segoe UI","PingFang SC","Microsoft YaHei UI","Microsoft YaHei",sans-serif;font-synthesis:none;--ink:#20384f;--muted:#5a7084;--blue:#184f87;--accent:#2f77bc;--page:#f5f8fc;--surface:#fff;--soft:#eef4fa;--selected:#e5eff9;--line:#d5e0eb;--radius:14px;color:var(--ink);background:var(--page)}
*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;min-height:100dvh;background:var(--page)}button,input,textarea,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer;transition:background 150ms,border-color 150ms,transform 150ms}button:not(:disabled):active{transform:translateY(1px)}button:disabled{cursor:wait;color:var(--muted)}:is(button,a,textarea,select):focus-visible{outline:3px solid var(--accent);outline-offset:3px}svg{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.symbols{position:absolute;width:0;height:0;overflow:hidden}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:20px;max-width:1280px;min-height:88px;margin:auto;padding:16px 32px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;color:var(--blue);text-decoration:none}.brand img{display:block;width:46px;height:46px;border-radius:50%;background:#fff}.brand strong{font-size:19px;font-weight:650}.top-meta{display:flex;align-items:center;gap:20px;color:var(--muted);font-size:12px}.role-label{border-left:1px solid var(--line);padding-left:20px}.management-link{display:inline-flex;align-items:center;min-height:44px;padding:10px 12px;border-radius:8px;color:var(--blue);font-size:13px;text-decoration:none;white-space:nowrap}.management-link:hover{background:var(--selected)}
main{max-width:1280px;margin:auto;padding:32px}.intro{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:28px}h1{margin:0;color:var(--ink);font-size:30px;font-weight:600;line-height:1.4;letter-spacing:-.5px}.simulation-clock{padding:7px 12px;border-radius:8px;background:var(--selected);color:var(--blue);font-size:12px;line-height:1.6;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.workspace{display:grid;grid-template-columns:292px minmax(0,1fr);gap:24px;align-items:start}.trip-panel,.chat-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}.trip-panel{padding:24px;position:sticky;top:24px}.panel-heading{margin-bottom:24px}h2{margin:0;font-size:16px;font-weight:650}
.place-fields{display:flex;align-items:center;gap:14px;position:relative;padding-right:28px}.place-dots{display:flex;flex-direction:column;align-items:center;width:9px}.place-dots i{width:8px;height:8px;border-radius:50%;border:2px solid var(--accent)}.place-dots i:last-child{background:var(--blue);border-color:var(--blue)}.place-dots b{width:1px;height:69px;background:var(--line);margin:6px 0}.place-selects{flex:1;min-width:0}.place-selects label{display:block;margin-bottom:4px;color:var(--muted);font-size:12px}.place-selects label[for=destination]{margin-top:16px}.place-selects select{width:100%;min-height:44px;padding:6px 0;border:0;border-bottom:1px solid var(--line);border-radius:0;background:var(--surface);color:var(--ink);font-size:14px;font-weight:550;cursor:pointer}.swap-button{position:absolute;right:-6px;top:47px;display:grid;place-items:center;width:44px;height:44px;border:1px solid var(--line);border-radius:8px;color:var(--blue);background:var(--soft)}.swap-button:hover{background:var(--selected)}.swap-button svg{width:18px;height:18px}
.trip-panel fieldset{min-width:0;border:0;padding:0;margin:28px 0 0}.trip-panel legend{margin-bottom:12px;padding:0;color:var(--muted);font-size:13px}.mode-options,.preference-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.mode-options button,.preference-options button{display:flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:10px 6px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--muted);font-size:13px;white-space:nowrap}.preference-options svg{width:15px;height:15px}.mode-options button[aria-pressed=true],.preference-options button[aria-pressed=true]{border-color:#93b6d7;color:var(--blue);background:var(--selected);font-weight:600}.mode-options button:hover,.preference-options button:hover{background:var(--soft)}
.chat-panel{display:flex;flex-direction:column;min-width:0;min-height:580px;overflow:hidden}.chat-header{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:72px;padding:14px 24px;border-bottom:1px solid var(--line)}.chat-header>div{display:flex;align-items:center;gap:12px}.assistant-mark{display:grid;place-items:center;width:32px;height:32px;border-radius:8px;background:var(--selected);color:var(--blue)}.assistant-mark svg{width:18px;height:18px}.reset-button{min-height:44px;padding:10px 12px;border:0;border-radius:8px;background:transparent;color:var(--blue);font-size:13px}.reset-button:hover{background:var(--soft)}.conversation{flex:1;min-height:350px;max-height:660px;overflow:auto;overscroll-behavior:contain;padding:28px 24px;scrollbar-width:thin;scrollbar-color:var(--line) transparent;scroll-behavior:smooth}
.welcome{padding:35px 8px 30px}.welcome-icon{display:grid;place-items:center;width:48px;height:48px;margin-bottom:22px;background:var(--selected);color:var(--blue);border-radius:12px}.welcome-icon svg{width:24px;height:24px}.welcome h3{margin:0 0 12px;font-size:25px;font-weight:600;line-height:1.5;letter-spacing:-.3px}.welcome p{max-width:36ch;margin:0;color:var(--muted);font-size:14px;line-height:1.8}.suggestions{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}.suggestions button{display:inline-flex;align-items:center;justify-content:space-between;gap:16px;min-height:44px;padding:11px 14px;border:1px solid var(--line);border-radius:8px;color:var(--blue);background:var(--surface);font-size:13px}.suggestions button:hover{border-color:#93b6d7;background:var(--soft)}.suggestions svg{width:14px;height:14px}
.composer-area{flex-shrink:0;padding:18px 24px 22px;border-top:1px solid var(--line);background:var(--surface)}.status{margin:0 0 12px;color:var(--muted);font-size:13px;line-height:1.7}.status.error{color:#963d35}#question-form{display:flex;gap:12px;align-items:flex-end;padding:8px 8px 8px 14px;border:1px solid #8296aa;border-radius:10px;background:var(--surface)}#question-form:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px #2f77bc20}#question{flex:1;min-width:0;max-height:130px;border:0;background:transparent;resize:none;padding:10px 0;color:var(--ink);font-size:14px;line-height:1.6}#question:focus-visible{outline:0}#question::placeholder{color:var(--muted)}#send{display:grid;place-items:center;flex-shrink:0;width:44px;height:44px;border:0;border-radius:8px;background:var(--blue);color:#fff}#send:hover{background:#123e6c}#send:disabled{color:#fff;background:#526d89}#send svg{width:20px;height:20px}
.user-message{display:flex;justify-content:flex-end;margin-bottom:24px}.user-message p{max-width:85%;margin:0;padding:12px 16px;border-radius:12px 12px 4px 12px;background:var(--selected);color:var(--blue);font-size:14px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere}.assistant-message{margin-bottom:30px}.reply-byline{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin-bottom:12px;color:var(--muted);font-size:12px}.reply-byline svg{width:15px;height:15px;color:var(--blue)}.trip-context{margin-left:auto;color:var(--muted);font-size:11px}.recommendation{margin:0 0 18px;color:var(--ink);font-size:15px;font-weight:500;line-height:1.8;overflow-wrap:anywhere}
.route-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.route-card{min-width:0;padding:18px;border:1px solid var(--line);border-radius:10px;background:var(--surface)}.route-card.recommended{grid-column:1/-1;padding:22px;border-color:#93b6d7;background:var(--soft);box-shadow:inset 3px 0 0 var(--accent)}.route-title{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px}.route-title h4{margin:0;color:var(--ink);font-size:14px;font-weight:600}.recommended .route-title h4{color:var(--blue);font-size:16px}.route-badges{display:flex;flex-wrap:wrap;gap:6px}.badge{padding:3px 6px;border-radius:4px;background:var(--selected);color:var(--blue);font-size:11px;line-height:1.5;white-space:nowrap}.badge.recommendation-badge{background:var(--blue);color:#fff}.route-metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:18px}.metric-label{display:flex;align-items:center;gap:5px;color:var(--muted);font-size:12px;line-height:1.6;margin-bottom:5px}.metric-label svg{width:13px;height:13px}.metric-value{color:var(--ink);font-size:27px;font-weight:600;line-height:1.3;letter-spacing:-.7px;font-variant-numeric:tabular-nums;white-space:nowrap}.recommended .metric-value{color:var(--blue);font-size:32px}.metric-value.long{font-size:23px}.metric-unit{margin-left:4px;color:var(--muted);font-size:12px;letter-spacing:0;font-weight:400}.comparison-highlights{display:grid;gap:6px;margin-top:16px;color:var(--muted);font-size:12px;line-height:1.7}.comparison-highlights b{color:var(--blue);font-weight:600}.result-time{margin:12px 0 0;color:var(--muted);font-size:11px}.pending{display:flex;align-items:center;gap:6px;padding:10px 0}.pending i{width:5px;height:5px;border-radius:50%;background:var(--accent);animation:pulse 1.2s infinite}.pending i:nth-child(2){animation-delay:.15s}.pending i:nth-child(3){animation-delay:.3s}@keyframes pulse{50%{opacity:.4}}.error-message{padding:12px 14px;border-left:3px solid #b36055;border-radius:0 8px 8px 0;background:#fff0ee;color:#963d35;font-size:14px;line-height:1.8;overflow-wrap:anywhere}footer{margin-top:20px;color:var(--muted);font-size:12px;line-height:1.7}footer p{margin:0}
@media(max-width:1023px){.topbar{padding:16px 24px}main{padding:28px 24px}.workspace{grid-template-columns:260px minmax(0,1fr);gap:18px}.trip-panel{padding:20px}.route-cards{grid-template-columns:1fr}.route-card.recommended{grid-column:auto}.route-metrics{gap:16px}}
@media(max-width:767px){.topbar{min-height:76px;padding:12px 16px}.brand img{width:40px;height:40px}.brand strong{font-size:17px}.top-meta{gap:6px}.campus,.role-label{display:none}.management-link{padding:10px;font-size:12px}main{padding:24px 16px}.intro{flex-direction:column;align-items:flex-start;gap:12px;margin-bottom:20px}h1{font-size:25px}.workspace{grid-template-columns:1fr;gap:20px}.trip-panel{position:static;padding:20px}.panel-heading{margin-bottom:18px}.place-dots{display:none}.place-fields{padding-right:38px}.place-selects{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);column-gap:18px;row-gap:4px}.place-selects label{margin:0}.place-selects label[for=origin]{grid-column:1;grid-row:1}.place-selects label[for=destination]{grid-column:2;grid-row:1;margin:0}.place-selects select{grid-row:2;font-size:16px}.swap-button{top:19px;right:-4px}.trip-panel fieldset{margin-top:20px}.trip-panel legend{font-size:12px;margin-bottom:10px}.mode-options button,.preference-options button{font-size:14px}.chat-panel{min-height:480px}.chat-header{padding:12px 18px;min-height:68px}.conversation{padding:24px 18px;min-height:280px;max-height:650px}.welcome{padding:8px 0 14px}.welcome h3{font-size:23px}.welcome p{font-size:14px}.suggestions{gap:8px;margin-top:22px}.suggestions button{font-size:13px;padding:11px 12px;gap:12px}.composer-area{padding:16px}#question{font-size:16px}.route-card{padding:18px}.route-card.recommended{padding:20px}.route-metrics{gap:12px}.metric-value{font-size:28px}.metric-value.long{font-size:23px}.recommended .metric-value{font-size:30px}.trip-context{flex-basis:100%;margin-left:22px;font-size:11px}.recommendation{font-size:14px}.user-message p{max-width:92%}footer{font-size:11px}}
/* One sliding selection surface; button labels and keyboard focus stay in place. */
#cancel-question,.local-fallback{padding:10px 12px;border:1px solid #8296aa;border-radius:8px;background:var(--surface);color:var(--blue);font-size:13px;line-height:1.6}
#cancel-question{flex-shrink:0;min-height:44px}
.error-message p{margin:0 0 8px}.error-message p:last-child{margin-bottom:0}.cancelled-message{color:var(--muted);font-size:13px;line-height:1.7}
.mode-options.has-motion,.preference-options.has-motion{position:relative;isolation:isolate}
.has-motion .selection-indicator{position:absolute;left:0;top:0;z-index:-1;pointer-events:none;border:1px solid #93b6d7;border-radius:8px;background:var(--selected)}
.mode-options.has-motion button,.preference-options.has-motion button{background:transparent}
.mode-options.has-motion button[aria-pressed=true],.preference-options.has-motion button[aria-pressed=true]{border-color:transparent}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.forecast-card{padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--selected)}.forecast-card h4{margin:0 0 16px;font-size:15px}.forecast-metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.forecast-metrics .metric-value{white-space:nowrap;font-size:25px}.forecast-route,.forecast-note,.forecast-assumptions{font-size:12px;line-height:1.7;color:var(--muted)}.forecast-route{margin:16px 0 0}.forecast-note{margin:10px 0}.forecast-assumptions summary{cursor:pointer;min-height:32px}.forecast-assumptions ul{margin:0;padding-left:18px}@media(max-width:600px){.forecast-card{padding:14px}.forecast-metrics{gap:8px}.forecast-metrics .metric-value{font-size:20px}.forecast-metrics .metric-label{font-size:11px}}