:root{--paper:#faf6ef;--white:#fffdf8;--ink:#271e12;--muted:#776c5d;--line:#e5dccd;--gold:#e8a020;--green:#4e6756;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;color:var(--ink);background:var(--paper);font-size:17px;line-height:1.6}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit;color:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.55;cursor:wait}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--gold);outline-offset:3px}h1,h2,h3,p{margin:0}header{max-width:1340px;margin:auto;padding:25px 48px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.logo{width:230px;height:auto;display:block}.lang{display:flex;gap:4px;background:#eee7da;border-radius:9px;padding:4px}.lang button{border:0;background:none;border-radius:6px;padding:7px 13px;font-size:14px}.lang button[aria-pressed=true]{background:var(--white);box-shadow:0 1px 4px #2d251215}.shell{max-width:1244px;margin:42px auto 56px;display:grid;grid-template-columns:330px minmax(0,1fr);gap:68px;padding:0 30px}.intro{padding-top:24px}.eyebrow{text-transform:uppercase;font-size:12px;font-weight:750;letter-spacing:.14em;color:var(--green);display:block;margin-bottom:16px}.intro h1{font-size:42px;line-height:1.22;font-weight:650;letter-spacing:-.04em;margin-bottom:20px}.intro>p{font-size:18px;color:var(--muted)}.intro-photo{margin-top:30px;width:100%;height:190px;object-fit:cover;border-radius:8px;filter:saturate(.65)}.intro-note{border-top:1px solid var(--line);margin-top:24px;padding-top:18px;font-size:14px!important}.chat-panel{border:1px solid var(--line);background:var(--white);border-radius:16px;overflow:hidden;box-shadow:0 10px 40px #372b1206}.chat-head{padding:23px 26px;border-bottom:1px solid var(--line);display:flex;gap:13px;align-items:center}.symbol{width:40px;height:40px;border-radius:50%;background:#f5e5c4;display:grid;place-items:center;font-family:Georgia,serif;font-size:25px;color:#775018}.chat-head h2{font-size:19px}.chat-head p{font-size:13px;color:var(--muted)}.prefs{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:10px;padding:18px 26px;border-bottom:1px solid var(--line);background:#fcfaf5}label{display:block;font-size:14px;font-weight:600}select,input,textarea{width:100%;border:1px solid #d9cfbf;border-radius:7px;background:var(--white);padding:10px 12px;margin-top:6px;min-height:45px}select{font-size:14px;padding-right:22px}.transcript{min-height:215px;max-height:440px;overflow-y:auto;padding:24px 26px;overscroll-behavior:contain;scroll-behavior:smooth}.bubble{max-width:95%;white-space:pre-wrap;font-size:16px;margin-bottom:16px;line-height:1.7}.bubble.user{background:#f2ebdf;padding:12px 17px;border-radius:12px 12px 0 12px;margin-left:30px;width:fit-content;max-width:90%;justify-self:end}.bubble.assistant{padding-right:12px}.byline{display:block;color:var(--green);font-size:12px;font-weight:700;margin-bottom:5px}.suggestions{display:flex;flex-wrap:wrap;gap:7px;padding:0 26px 16px}.chip{border:1px solid var(--line);background:none;border-radius:30px;font-size:13px;padding:7px 13px}.compose{border-top:1px solid var(--line);padding:17px 26px 20px}.check{display:flex;align-items:flex-start;gap:9px;font-size:12px;color:var(--muted);font-weight:400;margin-bottom:12px}.check input{width:16px;min-height:16px;height:16px;flex-shrink:0;margin:4px 0 0;accent-color:#936816}.input-row{display:flex;align-items:end;gap:9px}.input-row textarea{resize:vertical;min-height:50px;max-height:140px;margin:0;font-size:16px}.primary{background:var(--gold);border:1px solid var(--gold);border-radius:7px;padding:12px 20px;font-weight:700;white-space:nowrap}.secondary{background:transparent;border:1px solid #cfc3b0;border-radius:7px;padding:10px 17px;font-weight:600}.contact-cta{padding:18px 26px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:16px;background:#f5f1e8}.contact-cta p{font-size:13px;color:var(--muted)}.error{color:#8a3e32;font-size:14px;background:#faede7;padding:11px 14px;border-radius:6px;margin:8px 0}.error:empty{display:none}.course{padding:17px;margin:14px 0;border:1px solid var(--line);border-radius:8px;background:#faf8f2}.course h3{font-size:18px}.course p{font-size:14px;color:var(--muted);margin:6px 0;white-space:pre-wrap}.course strong{display:block;margin:10px 0}.course button{font-size:14px}.hint{font-size:12px;color:var(--muted)}footer{max-width:1244px;margin:auto;padding:0 30px 30px;font-size:12px;color:var(--muted)}.skip{position:absolute;left:10px;top:-60px}.skip:focus{top:5px;background:white;padding:10px;z-index:10}dialog{width:min(640px,calc(100% - 24px));max-height:90dvh;overflow:auto;border:1px solid var(--line);border-radius:14px;background:var(--white);padding:0;color:var(--ink)}dialog::backdrop{background:#241c1480}dialog .dialog-head{display:flex;align-items:center;justify-content:space-between;padding:22px 26px;border-bottom:1px solid var(--line)}.dialog-head h2{font-size:23px}.close{border:0;background:none;font-size:28px;padding:0 7px}.form-body{padding:22px 26px}.form-body label{margin-bottom:17px}.form-body .check{font-size:13px;font-weight:400}.form-body textarea{min-height:90px;resize:vertical}.form-foot{display:flex;justify-content:flex-end;gap:10px;padding:17px 26px;border-top:1px solid var(--line)}.honeypot{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}.success{padding:28px 26px;line-height:1.8}.success h3{color:var(--green);font-size:23px;margin-bottom:10px}.demo{color:#895d16;background:#fff0ce;padding:8px 26px;font-size:13px}.active-source{font-size:12px;color:var(--muted);margin-top:10px}.retry{border:0;text-decoration:underline;background:none;color:var(--ink);padding:8px 0}.counter{font-size:11px;text-align:right;color:var(--muted)}
@media(max-width:900px){header{padding:20px 26px}.shell{gap:28px;grid-template-columns:260px minmax(0,1fr);padding:0 25px}.intro h1{font-size:34px}.prefs{padding:16px;gap:6px}.chat-head,.transcript,.compose,.contact-cta{padding-left:19px;padding-right:19px}.suggestions{padding-left:19px;padding-right:19px}.prefs select{padding-left:8px;font-size:13px}}
@media(max-width:680px){header{padding:16px 20px}.logo{width:180px}.lang button{padding:5px 10px}.shell{display:block;margin:24px auto;padding:0 16px}.intro{padding:0 5px 24px}.intro .eyebrow{margin-bottom:10px}.intro h1{font-size:30px;margin-bottom:12px}.intro>p{font-size:16px}.intro-photo,.intro-note{display:none}.chat-panel{border-radius:12px}.chat-head{padding-top:17px;padding-bottom:17px}.prefs{grid-template-columns:1fr 1fr 1fr;padding:13px}.prefs label{font-size:12px}.prefs select{font-size:12px;padding:8px 4px}.transcript{min-height:200px;max-height:380px;padding-top:18px}.bubble{font-size:16px}.compose{padding:14px}.input-row .primary{padding:12px 14px}.contact-cta{align-items:flex-start;flex-direction:column;gap:10px}.contact-cta .secondary{width:100%}footer{padding:0 22px 24px}.form-body{padding:19px}.form-foot{padding:15px 19px}.primary{white-space:normal}dialog{max-height:92dvh}.intro .active-source{display:none}}
@media(prefers-reduced-motion:reduce){.transcript{scroll-behavior:auto}}

/* Official Duke artwork is a white wordmark; retain its dark brand ground. */
header{max-width:none;background:#2c2419;padding-left:max(26px,calc((100vw - 1184px)/2));padding-right:max(26px,calc((100vw - 1184px)/2))}.lang{background:#514637}.lang button{color:#fff8eb}.lang button[aria-pressed=true]{color:#271e12}.intro h1{white-space:pre-line}
@media(max-width:680px){header{padding-left:20px;padding-right:20px}.intro h1{white-space:normal;font-size:29px}}