:root{--n:#0b1636;--n2:#13224d;--n3:#1b2f66;--g:#d4af37;--g2:#f3d77a;--t:#efe9da;--m:#b9b3a3;--ok:#6fe39a;--bad:#ff8a8a;--pc:#5fb3ff}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;color:var(--t);font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif;background:radial-gradient(circle at 50% -20%,#1d3270,#0b1636 60%) fixed;min-height:100vh}
h1,h2,h3{font-family:Georgia,'Times New Roman',serif;color:var(--g2);letter-spacing:.02em;line-height:1.25}a{color:var(--g2)}
header{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:10px;padding:10px 14px;background:#0b1636ee;backdrop-filter:blur(6px);border-bottom:1px solid #d4af3755}
.brand{display:flex;align-items:center;gap:8px;text-decoration:none}.brand b{font-family:Georgia,serif;color:var(--g);font-size:1.1rem}.brand span{color:var(--g2)}
nav{margin-left:auto;display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:flex-end}nav a{text-decoration:none;font-size:.9rem;padding:6px 8px}
button{font:inherit;cursor:pointer}
#mute,.btn{background:var(--n2);color:var(--g2);border:1px solid var(--g);border-radius:999px;padding:8px 14px;min-height:44px}
.btn.gold{background:linear-gradient(#f3d77a,#d4af37);color:#0b1636;font-weight:700;border:0}.btn:disabled{opacity:.45;cursor:default}
main{max-width:980px;margin:auto;padding:16px;outline:none;min-height:70vh}
.card{background:linear-gradient(160deg,#13224dcc,#0b1636cc);border:1px solid #d4af3755;border-radius:18px;padding:18px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
/* campus scene */
.scene{position:relative;border-radius:22px;overflow:hidden;border:1px solid #d4af3755;margin-bottom:18px}
.scene svg{display:block;width:100%;height:auto}
.scene .cap{position:absolute;left:0;right:0;bottom:0;padding:14px 18px;background:linear-gradient(transparent,#0b1636f0)}
.scene .cap h1{margin:0;font-size:clamp(1.4rem,4.5vw,2.3rem)}.scene .cap p{margin:4px 0 0;color:var(--m)}
.tw{animation:tw 3s ease-in-out infinite}.tw:nth-child(3n){animation-delay:1s}.tw:nth-child(3n+1){animation-delay:2s}
@keyframes tw{50%{opacity:.2}}
.shoot{animation:shoot 7s linear infinite}@keyframes shoot{0%,80%{transform:translate(0,0);opacity:0}82%{opacity:1}92%{transform:translate(-260px,130px);opacity:0}100%{opacity:0}}
.flag{animation:flag 1.6s ease-in-out infinite alternate;transform-origin:left center}@keyframes flag{to{transform:skewY(-8deg) scaleX(.9)}}
.win{animation:win 4s ease-in-out infinite}.win:nth-of-type(2n){animation-delay:1.3s}@keyframes win{50%{fill:#ffd36b}}
.lant{animation:lant 9s ease-in-out infinite}.lant:nth-of-type(2){animation-delay:3s}.lant:nth-of-type(3){animation-delay:6s}
@keyframes lant{0%{transform:translateY(40px);opacity:0}15%{opacity:1}100%{transform:translateY(-260px) translateX(30px);opacity:0}}
.orbit{animation:spin 12s linear infinite;transform-origin:600px 210px}@keyframes spin{to{transform:rotate(360deg)}}
/* faculty cards */
.fac{position:relative;text-decoration:none;color:var(--t);display:block;transition:transform .25s,box-shadow .25s}
.fac:hover,.fac:focus{transform:translateY(-4px);box-shadow:0 10px 30px #0008,0 0 0 1px var(--pc)}
.fac .em{font-size:2.2rem;display:inline-block;animation:bob 3s ease-in-out infinite}@keyframes bob{50%{transform:translateY(-6px)}}
.fac h3{margin:.3em 0}.fac p{margin:0;color:var(--m);font-size:.95rem}
.bar{height:8px;background:#ffffff14;border-radius:9px;overflow:hidden;margin-top:12px}.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--g),var(--g2));border-radius:9px;transition:width .6s}
.meta{font-size:.82rem;color:var(--m);margin-top:6px}
.hero2{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin-bottom:16px}.hero2 .pf{width:110px;flex:none}
.lesson-list{display:grid;gap:10px}.lesson-list a{display:flex;justify-content:space-between;gap:10px;align-items:center;text-decoration:none;color:var(--t);padding:14px 16px;border-radius:14px;background:#13224d99;border:1px solid #d4af3733;min-height:56px}
.lesson-list a:hover{border-color:var(--g)}.done{color:var(--ok);font-size:.9rem;white-space:nowrap}
/* lesson */
.steps{position:relative;min-height:190px}.step{animation:in .45s ease}@keyframes in{from{opacity:0;transform:translateX(24px)}}
.dots{display:flex;gap:6px;margin:10px 0}.dots i{width:10px;height:10px;border-radius:50%;background:#ffffff22}.dots i.on{background:var(--g)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:14px}
.try{margin-top:16px;border:1px dashed var(--g);border-radius:14px;padding:14px;background:#0b163699}.try input[type=range]{width:100%;accent-color:var(--g)}.try output{display:block;margin-top:8px}
.opts{display:grid;gap:8px;margin-top:10px}.opts button{text-align:left;background:var(--n2);color:var(--t);border:1px solid #d4af3766;border-radius:12px;padding:12px 14px;min-height:48px}
.opts button.ok{border-color:var(--ok);background:#1d5a3a}.opts button.bad{border-color:var(--bad);background:#5a1d2a;animation:shake .35s}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
.fb{margin-top:10px;min-height:1.6em}
.breathe{display:grid;place-items:center;margin:18px 0}.breathe div{width:120px;height:120px;border-radius:50%;background:radial-gradient(circle,#ff9fb8aa,#d4af3733);box-shadow:0 0 40px #ff9fb855;animation:box 16s linear infinite;display:grid;place-items:center;font-weight:700;color:#fff}
@keyframes box{0%{transform:scale(.6)}25%{transform:scale(1)}50%{transform:scale(1)}75%{transform:scale(.6)}100%{transform:scale(.6)}}
.badge{display:inline-block;padding:4px 10px;border-radius:999px;background:#d4af3722;border:1px solid var(--g);color:var(--g2);font-size:.85rem;margin:2px}
/* professor bot */
.pf .head{animation:float 3.2s ease-in-out infinite}@keyframes float{50%{transform:translateY(-4px)}}
.pf .eye{animation:blink 4.5s infinite;transform-origin:center;transform-box:fill-box}@keyframes blink{0%,94%,100%{transform:scaleY(1)}96%{transform:scaleY(.1)}}
.pf .mouth{transform-origin:center;transform-box:fill-box;transition:transform .1s}
.talking .pf .mouth{animation:talk .22s ease-in-out infinite alternate}@keyframes talk{from{transform:scaleY(.3)}to{transform:scaleY(1.4)}}
.pf .ant{animation:ant 1.8s ease-in-out infinite alternate;transform-origin:50% 100%;transform-box:fill-box}@keyframes ant{from{transform:rotate(-12deg)}to{transform:rotate(12deg)}}
.pf .glow{animation:glow 2s ease-in-out infinite alternate}@keyframes glow{to{opacity:.35}}
#bot{position:fixed;right:12px;bottom:12px;z-index:30;display:flex;flex-direction:column;align-items:flex-end;gap:6px;pointer-events:none}
#botbtn{pointer-events:auto;width:86px;height:96px;border:0;background:none;padding:0;filter:drop-shadow(0 6px 14px #0009)}
#bubble{pointer-events:auto;max-width:min(300px,calc(100vw - 110px));background:#fffdf6;color:#1b1b2b;border-radius:16px 16px 4px 16px;padding:10px 14px;font-size:.92rem;box-shadow:0 8px 24px #0007;animation:pop .3s ease;cursor:pointer}
@keyframes pop{from{transform:scale(.6);opacity:0}}
#chat{position:fixed;right:12px;bottom:118px;z-index:31;width:min(360px,calc(100vw - 24px));max-height:min(520px,calc(100vh - 150px));display:flex;flex-direction:column;background:#0b1636f7;border:1px solid var(--g);border-radius:18px;box-shadow:0 16px 40px #000a;overflow:hidden}
#chat[hidden]{display:none}.chead{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid #d4af3755;font-family:Georgia,serif;color:var(--g2)}
.chead button{background:none;border:0;color:var(--g2);font-size:1.1rem;min-width:44px;min-height:44px}
#clog{flex:1;overflow:auto;padding:10px 12px;display:flex;flex-direction:column;gap:8px}
.m{max-width:88%;padding:8px 12px;border-radius:14px;font-size:.92rem}.m.b{background:#13224d;border:1px solid #d4af3744;align-self:flex-start}.m.u{background:var(--g);color:#0b1636;align-self:flex-end}
#chips{display:flex;gap:6px;flex-wrap:wrap;padding:0 12px 8px}#chips button{background:var(--n2);color:var(--g2);border:1px solid #d4af3766;border-radius:999px;padding:6px 10px;font-size:.82rem;min-height:36px}
#cform{display:flex;gap:6px;padding:10px;border-top:1px solid #d4af3755}#cform input{flex:1;min-width:0;background:#0006;border:1px solid #d4af3766;color:var(--t);border-radius:999px;padding:10px 14px;font:inherit}#cform button{background:var(--g);color:#0b1636;border:0;border-radius:999px;padding:0 16px;font-weight:700}
footer{max-width:980px;margin:30px auto 120px;padding:0 16px;color:var(--m);font-size:.85rem;text-align:center}footer .tiny{font-size:.75rem;opacity:.7}
#fx{position:fixed;inset:0;pointer-events:none;z-index:40;overflow:hidden}#fx i{position:absolute;top:-20px;width:9px;height:14px;border-radius:2px;animation:fall 2.4s ease-in forwards}
@keyframes fall{to{transform:translateY(110vh) rotate(720deg)}}
@media(max-width:600px){nav a{font-size:.82rem;padding:4px}.brand b{font-size:.95rem}#botbtn{width:70px;height:78px}#chat{bottom:96px}main{padding:12px}.card{padding:14px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}