:root{--ink:#142b37;--muted:#516873;--paper:#f4f7f9;--blue:#174c60;--gold:#f6c565;--line:#dce5e9;--white:#fff;--green:#116344;--red:#a03c35}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font:16px/1.7 Arial,'Microsoft YaHei',sans-serif}button,a,input,textarea{touch-action:manipulation}button,input,textarea{font:inherit}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #bb7400;outline-offset:4px}header{display:flex;align-items:center;gap:36px;padding:18px 5%;background:white;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;line-height:1.4;letter-spacing:1.5px;font-size:14px}.brand small{display:block;font-size:12px;color:var(--muted);letter-spacing:2px}.mark{font:bold 30px Georgia;background:var(--blue);color:white;padding:8px 12px;border-radius:10px}nav{display:flex;gap:28px;margin-left:auto}nav a{text-decoration:none;font-size:15px;padding:8px 0}nav a[aria-current=page]{border-bottom:2px solid var(--blue);font-weight:bold}.subtle{background:transparent;border:1px solid var(--line);padding:8px 14px;border-radius:7px;color:var(--ink);font-size:14px}main{min-height:75vh;max-width:1440px;margin:auto;padding:34px 5% 60px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(30px,4vw,51px);line-height:1.2;letter-spacing:-1px;margin-bottom:18px}h2{font-size:26px;line-height:1.4}h3{font-size:19px;line-height:1.4}small,.meta{font-size:14px;color:var(--muted)}.eyebrow{font-size:13px;font-weight:bold;letter-spacing:2px;color:var(--blue);margin-bottom:12px}.zh{color:var(--muted);font-size:16px;letter-spacing:.2px}.hide-zh .zh{display:none}.intro{display:flex;justify-content:space-between;gap:24px;align-items:end;margin:4px 0 25px}.intro p{margin-bottom:0}.pill{border:1px solid var(--line);padding:5px 11px;border-radius:30px;font-size:13px;background:white;white-space:nowrap}.campus{position:relative;min-height:440px;border-radius:18px;overflow:hidden;background:var(--ink);display:flex;align-items:end;padding:38px;margin-bottom:30px}.campus:before{content:'';position:absolute;inset:0;background:linear-gradient(90deg,rgba(10,27,36,.92),rgba(10,27,36,.30) 65%,rgba(10,27,36,.1)),url('campus.png') center/cover}.campus-copy{position:relative;max-width:470px;color:white}.campus-copy .zh{color:#dce6e8}.campus-copy .eyebrow{color:var(--gold)}.campus-copy h2{font:normal clamp(32px,4vw,50px)/1.2 Georgia,serif}.campus-copy p{max-width:360px}.hotspot{position:absolute;right:15%;top:47%;display:flex;flex-direction:column;background:white;color:var(--ink);padding:13px 20px;border-radius:10px;text-decoration:none;box-shadow:0 5px 30px #0005;border-left:5px solid var(--gold)}.hotspot small{font-size:13px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;text-decoration:none;border:0;border-radius:8px;background:var(--blue);color:white;padding:12px 20px;font-weight:bold;font-size:15px}.btn.gold{background:var(--gold);color:#182d37}.btn.light{background:white;color:var(--blue);border:1px solid var(--line)}.btn:disabled{opacity:.45;cursor:not-allowed}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.section-head{display:flex;align-items:center;justify-content:space-between;margin:25px 0 18px}.section-head h2{margin:0}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{padding:24px;border:1px solid var(--line);border-radius:12px;background:white;text-decoration:none}.card:hover{border-color:#7294a3}.card .num{font:italic 29px Georgia;color:#7294a3}.card h3{margin:12px 0 4px}.card p{margin:0}.card .meta{display:block;margin-top:18px}.layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:34px}.sidebar{align-self:start;position:sticky;top:25px}.sidebar a{display:block;padding:12px 16px;text-decoration:none;border-left:3px solid transparent}.sidebar a.active{background:#e3edf1;border-color:var(--blue);font-weight:bold}.sidebar small{display:block}.panel{background:white;border:1px solid var(--line);padding:30px;border-radius:14px}.lesson-top{display:flex;justify-content:space-between;gap:16px;align-items:start}.lesson-top h1{font-size:38px}.key{background:#e8f0f4;border-left:4px solid var(--blue);padding:20px;margin:24px 0}.key strong{font-size:22px}.lesson-text{font-size:20px}.tip{border-top:1px solid var(--line);padding-top:22px;margin-top:22px}.video{width:100%;aspect-ratio:16/9;border-radius:10px;background:#142b37;display:block;margin:18px 0 8px}.actions{margin-top:28px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}.question-wrap{max-width:850px;margin:0 auto}.progress-track{height:6px;background:#dce6ea;border-radius:6px;margin:22px 0;overflow:hidden}.progress-track span{display:block;height:100%;background:var(--blue)}.options{display:grid;gap:12px;margin-top:24px}.option{display:flex;gap:15px;align-items:center;text-align:left;padding:15px 18px;border:1px solid var(--line);border-radius:9px;background:white;color:var(--ink)}.option span{border:1px solid var(--line);padding:2px 10px;border-radius:5px;font-size:14px;flex-shrink:0}.option.selected{border:2px solid var(--blue);background:#eaf1f5;padding:14px 17px}.option.correct{background:#e8f5ed;border-color:var(--green)}.option.wrong{background:#fcece9;border-color:var(--red)}.feedback{padding:20px;background:#edf4f8;border-radius:9px;margin-top:20px}.feedback p:last-child{margin-bottom:0}.score{font:normal 74px/1.2 Georgia;color:var(--blue)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:25px 0}.stats .panel{padding:22px}.stats strong{display:block;font-size:30px}.listrow{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:18px 0;border-bottom:1px solid var(--line)}textarea{width:100%;min-height:150px;border:1px solid #8ca4ae;border-radius:8px;padding:15px;color:var(--ink);resize:vertical}details{padding:18px 0;border-bottom:1px solid var(--line)}summary{cursor:pointer;font-weight:bold}details p{margin:14px 0}footer{max-width:1440px;margin:auto;padding:23px 5%;border-top:1px solid var(--line);display:flex;gap:20px;justify-content:space-between;font-size:13px;color:var(--muted)}#notice:not(:empty){position:fixed;bottom:24px;left:50%;transform:translateX(-50%);padding:12px 20px;background:var(--ink);color:white;border-radius:8px;z-index:10;max-width:90vw}.empty{text-align:center;padding:45px 15px}.label{display:block;margin-bottom:8px}input{padding:10px 14px;max-width:100%;border:1px solid var(--line);border-radius:7px}.about{max-width:850px;margin:auto}.about li{margin-bottom:10px}@media(max-width:800px){header{gap:15px;flex-wrap:wrap;padding:15px 5%}.brand{margin-right:auto}nav{order:3;width:100%;justify-content:space-around;margin:0;gap:15px}main{padding-top:22px}.intro{display:block}.intro .pill{display:inline-block;margin-top:12px}.campus{min-height:460px;padding:25px;align-items:start}.campus-copy{max-width:90%}.campus:before{background:linear-gradient(180deg,rgba(10,27,36,.9),rgba(10,27,36,.3)),url('campus.png') center/cover}.hotspot{top:auto;bottom:25px;right:25px}.grid{grid-template-columns:repeat(2,1fr)}.layout{grid-template-columns:1fr;gap:22px}.sidebar{position:static;display:flex;gap:6px;overflow:auto;padding-bottom:6px}.sidebar .eyebrow{display:none}.sidebar a{white-space:nowrap;padding:8px 12px;font-size:14px}.sidebar small{font-size:12px}.panel{padding:22px}.lesson-top h1{font-size:30px}.stats{gap:8px}.stats .panel{padding:15px}.stats strong{font-size:25px}footer{flex-wrap:wrap}.lesson-text{font-size:18px}}@media(max-width:450px){.grid{grid-template-columns:1fr}.card{padding:20px}.stats{grid-template-columns:1fr}.stats .panel{display:flex;align-items:center;gap:15px}.campus-copy h2{font-size:32px}.subtle{padding:7px 9px}.section-head{align-items:start;gap:12px}.section-head h2{font-size:22px}}@media print{header,footer,.actions,.btn,.sidebar,video,#notice{display:none!important}main{padding:0}.panel{border:0}.layout{display:block}.stats{display:flex}.zh{display:block!important}}
#tour-dialog{padding:0;border:1px solid var(--line);border-radius:16px;width:min(700px,92vw);max-height:85svh;color:var(--ink);box-shadow:0 25px 100px #0005}#tour-dialog::backdrop{background:rgba(9,25,32,.65);backdrop-filter:blur(5px)}.dialog-head{position:sticky;top:0;background:white;z-index:1;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px 26px;border-bottom:1px solid var(--line)}.dialog-head h2{margin:0;font-size:24px}.dialog-body{padding:25px 26px}.dialog-body .btn{margin-top:14px}.tour-map{display:grid;grid-template-columns:1fr 1fr;gap:10px}.map-item{display:block;background:#f1f5f7;border:1px solid var(--line);padding:13px 15px;border-radius:8px;text-decoration:none}.map-item small{display:block}.map-item:hover{background:#e2edf1}.video-links{display:grid;gap:10px}.tour-mode{background:#eef2f4}.tour-mode main{max-width:1600px;padding:22px 3% 20px}.tour-mode footer{padding-top:15px;padding-bottom:15px}.tour-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 17px}.tour-heading .eyebrow{margin:0 0 3px;font-size:12px;letter-spacing:1px}.tour-heading .eyebrow span{color:var(--muted);font-weight:normal}.tour-heading h1{font-size:27px;margin:0;letter-spacing:0;line-height:1.4}.tour-heading h1 small{font-size:14px;font-weight:normal;margin-left:12px}.scene-stage{background:#14242c;border-radius:14px;overflow:hidden;box-shadow:0 10px 35px #142b3718}.scene-canvas{position:relative;width:100%;max-width:calc((100svh - 280px)*1.76);min-width:55%;margin:0 auto;line-height:0}.scene-photo{width:100%;height:auto;display:block;animation:scene-enter .45s ease-out}.scene-hotspot{position:absolute;transform:translate(-50%,-50%);display:flex;align-items:center;gap:8px;background:rgba(15,39,52,.94);color:white;border:1px solid #ffffffbb;border-radius:40px;padding:7px 14px 7px 7px;box-shadow:0 4px 20px #0006;text-decoration:none;white-space:nowrap;font:600 14px/1.4 Arial,'Microsoft YaHei',sans-serif;min-height:44px;transition:background .2s,box-shadow .2s}.scene-hotspot:hover{background:#174c60;box-shadow:0 0 0 5px #ffffff35,0 4px 20px #0006}.scene-hotspot .spot-icon{display:flex;align-items:center;justify-content:center;width:29px;height:29px;border-radius:50%;background:#f6c565;color:#142b37;font-size:19px;flex-shrink:0}.scene-hotspot.read .spot-icon{background:#e1edf3;font:bold 18px Georgia}.scene-caption{position:absolute;bottom:12px;left:15px;color:white;background:#142b37bb;padding:10px 12px;border-radius:6px;font-size:12px;line-height:1.4;pointer-events:none}.tour-toolbar{display:flex;justify-content:space-between;align-items:center;gap:22px;padding:20px 0 12px}.tour-instruction{display:flex;gap:15px;align-items:center}.tour-step{font:italic 35px Georgia;color:#7793a1;flex-shrink:0}.tour-instruction p{margin:0;max-width:630px;font-size:15px}.tour-toolbar .row{flex-shrink:0}.tour-bottom{display:flex;gap:20px;font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:13px}.tour-bottom a:first-of-type{margin-left:auto}.scene-mobile-actions{display:none}@keyframes scene-enter{from{opacity:.45;transform:scale(1.008)}to{opacity:1;transform:scale(1)}}@media(prefers-reduced-motion:reduce){.scene-photo{animation:none}.scene-hotspot{transition:none}}@media(max-width:850px){.tour-mode main{padding:20px 4%}.scene-canvas{max-width:100%;min-width:0}.tour-heading h1{font-size:24px}.tour-heading h1 small{display:block;margin:0;font-size:13px}.tour-toolbar{align-items:start;flex-direction:column;gap:15px}.tour-toolbar .row{width:100%;justify-content:space-between}.scene-hotspot{padding:5px;min-width:44px;min-height:44px;justify-content:center}.scene-hotspot .spot-text{display:none}.scene-caption{display:none}.scene-mobile-actions{display:flex;flex-wrap:wrap;gap:8px;padding:8px 0 18px}.scene-mobile-actions a,.scene-mobile-actions button{border:1px solid #b7cbd5;border-radius:7px;background:white;color:var(--blue);text-decoration:none;padding:10px 12px;font-size:14px;line-height:1.5}.tour-bottom{gap:14px;flex-wrap:wrap}.tour-bottom a:first-of-type{margin-left:0}.tour-map{grid-template-columns:1fr}.dialog-head{padding:17px}.dialog-body{padding:20px}.tour-mode header .subtle{font-size:12px}}@media print{.scene-hotspot,.scene-mobile-actions,.tour-toolbar .row,#tour-dialog{display:none}}
/* The two arrival scenes use their pictured entrances instead of shortcut navigation. */
body.arrival-mode header nav a:not(:first-child),body.arrival-mode #lang,body.arrival-mode .tour-heading>[data-tour=map],body.arrival-mode .tour-toolbar>.row,body.arrival-mode .tour-bottom,body.arrival-mode footer>a{display:none}