:root{color-scheme:light;--ink:#173d35;--muted:#63796e;--paper:#f7faf7;--coral:#e26c57;--line:#dce5dd}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}a,button{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible{outline:3px solid var(--coral);outline-offset:4px}.skip-link{position:fixed;top:-80px;left:20px;padding:14px;background:white;z-index:100}.skip-link:focus{top:10px}.campus-stage{position:relative;height:100vh;height:100svh;min-height:600px;isolation:isolate;overflow:hidden;background:#d4dfd4}.mosaic{position:absolute;inset:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-template-rows:repeat(3,minmax(0,1fr));gap:2px;background:#fff5}.tile{position:relative;min-width:0;min-height:0;perspective:1600px}.tile-button{width:100%;height:100%;position:relative;border:0;background:transparent;padding:0;text-align:left;color:var(--ink)}.tile-inner{position:absolute;inset:0;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.2,.75,.2,1)}.tile.is-flipped .tile-inner{transform:rotateY(180deg)}.tile-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;overflow:hidden}.tile-front{background-color:#c5d6cb;background-repeat:no-repeat}.tile-front:after{content:"";position:absolute;inset:0;background:#ffffff;opacity:0;transition:opacity .2s}.tile-button:hover .tile-front:after{opacity:.08}.tile-hint{position:absolute;bottom:17px;right:17px;color:white;font-size:21px;text-shadow:0 1px 7px #142e23}.tile-back{transform:rotateY(180deg);background:var(--card-color,#e5edcf);padding:24px;display:flex;flex-direction:column;justify-content:center}.tile-back small{font-size:10px;opacity:.65;margin-bottom:10px}.tile-back strong{font-size:23px;line-height:1.5;font-weight:650;overflow-wrap:anywhere}.tile-back em{font-style:normal;font-size:11px;margin-top:16px}.photo-shade{position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(246,250,246,.97) 0%,rgba(246,250,246,.78) 12%,rgba(246,250,246,.2) 36%,transparent 50%,rgba(13,31,26,.16) 78%,rgba(13,31,26,.52) 100%);z-index:1}.site-header{position:absolute;top:0;left:0;right:0;padding:32px 4.4vw;display:flex;align-items:center;justify-content:space-between;z-index:3;pointer-events:none}.site-header a{pointer-events:auto}.brand{font-weight:700;font-size:19px}.brand small{display:block;margin-top:5px;font-size:10px;font-weight:400;color:var(--muted)}nav{display:flex;align-items:center;gap:25px;font-size:13px}.account-link{border-left:1px solid #173d3533;padding-left:25px}.intro{position:absolute;top:130px;left:4.4vw;right:4.4vw;z-index:2;pointer-events:none}.eyebrow{font-size:10px;font-weight:650;display:inline-flex;gap:8px;align-items:center}.status-dot{width:7px;height:7px;border-radius:50%;background:var(--coral)}.intro-main{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-top:18px}h1{font-size:clamp(34px,4.2vw,64px);font-weight:750;line-height:1.18;margin:0;letter-spacing:-1px}.title-dot{color:var(--coral);padding-left:5px}.headline{font-size:clamp(21px,2.1vw,30px);margin:13px 0 0;line-height:1.4}.intro-note{font-size:13px;line-height:1.9;border-left:2px solid #173d3540;padding-left:19px;margin:0 0 3px}.scene-bar{position:absolute;left:4.4vw;right:4.4vw;bottom:102px;display:flex;justify-content:space-between;align-items:center;gap:14px;z-index:3;pointer-events:none}.scene-bar button{pointer-events:auto}.photo-switch,.board-actions{display:flex;gap:7px}.scene-bar button{border:1px solid #ffffff70;border-radius:4px;padding:9px 13px;background:#f7faf7eb;color:var(--ink);font-size:11px;box-shadow:0 2px 8px #152d2410}.photo-switch button[aria-pressed="true"]{background:var(--ink);color:#f1f7eb;border-color:var(--ink)}.stage-bottom{position:absolute;bottom:30px;left:4.4vw;right:4.4vw;display:flex;align-items:center;justify-content:space-between;gap:20px;z-index:3;pointer-events:none}.scene-note{font-size:10px;color:#fff;letter-spacing:1px}.floating-hall{pointer-events:auto;display:flex;justify-content:space-between;gap:50px;align-items:center;font-size:13px;background:#f8fbef;color:#173d35;padding:17px 22px;border-radius:4px;box-shadow:0 4px 22px #142a2320}.floating-hall span{font-size:23px}.image-error{position:absolute;left:4.4vw;top:45%;z-index:2;padding:12px;background:#f8faee;font-size:12px}.no-script-photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.no-script-note{position:absolute;top:55%;left:4.4vw;background:white;padding:14px;z-index:2}.next-chapter,.source-note,footer{max-width:1280px;margin-left:auto;margin-right:auto;padding-left:44px;padding-right:44px}.next-chapter{display:flex;justify-content:space-between;align-items:center;gap:22px;padding-top:42px;padding-bottom:28px}.next-chapter .eyebrow{color:var(--coral);font-size:9px}.next-chapter h2{font-size:25px;margin:11px 0}.next-chapter p{font-size:12px;color:var(--muted);line-height:1.8;margin:0}.hall-link{display:flex;align-items:center;gap:45px;padding:18px 25px;color:white;background:var(--ink);border-radius:4px;font-size:13px;white-space:nowrap}.hall-link span{color:#dfedb5;font-size:20px}.source-note{font-size:10px;color:var(--muted);margin-top:0;margin-bottom:27px;line-height:1.7}footer{display:flex;justify-content:space-between;gap:20px;padding-top:23px;padding-bottom:25px;border-top:1px solid var(--line);font-size:9px;color:var(--muted);line-height:1.8}.photo-credit,.footer-links{display:flex;flex-wrap:wrap;gap:8px 14px}footer a:hover{text-decoration:underline}.card-reader{padding:0;border:1px solid #ffffff70;border-radius:8px;width:510px;max-width:calc(100vw - 32px);max-height:calc(100vh - 40px);max-height:calc(100svh - 40px);margin:auto;background:var(--card-color,#f0f2d9);color:var(--ink);box-shadow:0 30px 100px #11241d45;overflow:hidden}.card-reader[open]{display:flex;flex-direction:column;animation:unfold .38s cubic-bezier(.2,.75,.2,1)}.card-reader::backdrop{background:rgba(10,29,24,.25)}.reader-top{padding:20px 25px 0;display:flex;align-items:center;justify-content:space-between;font-size:11px;gap:14px}.reader-top>span{display:inline-flex;align-items:center;gap:8px}.reader-top>span:before{content:"";width:6px;height:6px;background:currentColor;border-radius:50%}.reader-close{flex:none;width:34px;height:34px;border:1px solid #173d3526;border-radius:50%;background:transparent;color:var(--ink);font-size:23px;line-height:1}.reader-close:hover{background:#ffffff65}.reader-scroll{padding:10px 28px 24px;overflow:auto;overscroll-behavior:contain}.reader-kind{font:10px/1.5 ui-monospace,monospace;letter-spacing:1px;color:#577068;margin-bottom:13px}.reader-scroll h2{font-size:32px;line-height:1.45;letter-spacing:-.6px;margin:0 0 14px}.reader-scroll>p{font-size:13px;line-height:1.85;margin:0 0 18px;color:#476056}.reader-note{font-size:11px!important;border-top:1px solid #173d3520;padding-top:15px;margin-top:20px!important;margin-bottom:0!important}.reader-footer{padding:18px 28px;background:#ffffff55;border-top:1px solid #173d3520;display:flex;flex-direction:column;gap:13px}.reader-footer>span{font-size:10px;line-height:1.6;color:#5f736a}.reader-link{display:flex;justify-content:space-between;padding:13px 16px;background:var(--ink);color:#fff;border-radius:4px;font-size:13px}.reader-link:after{content:"↗"}.reader-list{margin:0;padding:0;list-style:none;display:grid;gap:12px;font-size:13px;line-height:1.75}.reader-list li{display:flex;gap:12px;align-items:flex-start;padding:0}.step-number{font:11px/26px ui-monospace,monospace;flex:none;width:26px;height:26px;border:1px solid #173d3530;border-radius:50%;text-align:center}.reader-list:not(.numbered) li:before{content:"—";opacity:.5;flex:none}.check-item{display:flex;gap:11px;align-items:flex-start;cursor:pointer}.check-item input{margin:5px 0 0;width:16px;height:16px;accent-color:var(--ink);flex:none}.reader-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}.reader-chips span{background:#ffffff80;border:1px solid #173d3517;border-radius:30px;padding:9px 15px;font-size:14px}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.compare-cell{border:1px solid #173d3520;border-radius:5px;padding:18px;background:#ffffff45}.compare-cell h3{font-size:17px;margin:0 0 12px}.compare-cell p{font-size:12px;line-height:1.85;margin:0}.question-box{border-left:2px solid var(--ink);padding:0 0 0 17px;margin:12px 0 24px}.question-box h3{font-size:17px;line-height:1.6;margin:0 0 10px}.question-box p{font-size:13px;line-height:1.9;margin:0}.quiz-options{display:grid;gap:9px;margin-top:16px}.quiz-option{padding:13px;text-align:left;border:1px solid #173d3535;border-radius:4px;background:#ffffff60;color:var(--ink);font-size:13px}.quiz-option.is-right{background:#d6edc5;border-color:#357442}.quiz-option.is-wrong{background:#f2d6ce;border-color:#ba765d}.quiz-answer{font-size:13px;line-height:1.9;margin-top:18px;background:#ffffff70;padding:15px;border-radius:4px}.resource-stamp{display:inline-flex;border:1px solid currentColor;padding:7px 10px;margin:0 0 20px;font:11px/1.2 ui-monospace,monospace;transform:rotate(-3deg);color:#52736a}.reader-note[hidden],.quiz-answer[hidden],#photoLicense[hidden]{display:none}@keyframes unfold{from{opacity:0;transform:perspective(1200px) rotateY(-65deg) scale(.85)}to{opacity:1;transform:perspective(1200px) rotateY(0) scale(1)}}
@media(max-width:1000px){.intro{top:118px}.intro-note{font-size:11px;max-width:180px}.tile-back{padding:20px}.tile-back strong{font-size:19px}}
@media(max-width:720px) and (orientation:portrait){.mosaic{grid-template-columns:repeat(3,minmax(0,1fr));grid-template-rows:repeat(4,minmax(0,1fr))}.campus-stage{min-height:560px}.site-header{padding:22px 20px}.brand{font-size:15px}.brand small{font-size:8px}nav{gap:16px;font-size:11px}.account-link{padding-left:16px}.intro{top:111px;left:20px;right:20px}.intro-main{display:block;margin-top:15px}h1{font-size:35px;letter-spacing:-1px}.headline{font-size:22px;margin-top:9px}.eyebrow{font-size:9px}.intro-note{margin:16px 0 0;border:0;padding:0;max-width:none;font-size:11px}.intro-note br{display:none}.photo-shade{background:linear-gradient(180deg,#f5faf5eb 0%,#f5faf5c9 14%,#f5faf527 38%,transparent 52%,#102c233d 78%,#102c237a 100%)}.tile-back{padding:12px}.tile-back small{font-size:9px;margin-bottom:7px}.tile-back strong{font-size:14px;line-height:1.6}.tile-back em{font-size:9px;margin-top:9px}.tile-hint{font-size:17px;bottom:13px;right:12px}.scene-bar{left:20px;right:20px;bottom:98px}.scene-bar button{font-size:10px;padding:8px 10px}.photo-switch,.board-actions{gap:5px}.stage-bottom{left:20px;right:20px;bottom:max(24px,env(safe-area-inset-bottom))}.scene-note{font-size:8px;letter-spacing:0}.floating-hall{padding:14px 17px;gap:25px;font-size:11px}.floating-hall span{font-size:20px}.next-chapter,.source-note,footer{padding-left:20px;padding-right:20px}.next-chapter{padding-top:31px;display:block}.next-chapter h2{font-size:23px}.hall-link{margin-top:22px;justify-content:space-between;padding:15px 18px}.source-note{font-size:9px}footer{display:block}.footer-links{margin-top:12px}.reader-scroll{padding:8px 22px 22px}.reader-scroll h2{font-size:27px}.reader-top{padding:16px 19px 0}.reader-footer{padding:16px 22px}.compare-grid{gap:8px}.compare-cell{padding:14px}.reader-scroll>p,.reader-list{font-size:12px}}
@media(max-height:580px) and (orientation:landscape){.campus-stage{min-height:360px}.site-header{padding:16px 24px}.brand small{display:none}.intro{top:73px;left:24px;right:24px}.intro-main{margin-top:9px}h1{font-size:30px}.headline{font-size:18px;margin-top:5px}.intro-note{display:none}.scene-bar{bottom:75px;left:24px;right:24px}.stage-bottom{bottom:17px;left:24px;right:24px}.floating-hall{padding:10px 17px}.scene-bar button{padding:7px 10px}.tile-back strong{font-size:14px}.tile-back small,.tile-back em{font-size:9px;margin:2px 0}.tile-back{padding:12px}.reader-top{padding-top:10px}.reader-scroll h2{font-size:23px}.reader-footer{padding:12px 22px}.reader-close{width:28px;height:28px;font-size:20px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}html{scroll-behavior:auto}}
@media(max-width:720px) and (orientation:portrait){.scene-bar{bottom:calc(max(24px,env(safe-area-inset-bottom)) + 36px)}}

/* Gentle motion suggests that each photo tile is interactive without breaking the mosaic. */
.tile-button{will-change:transform;animation:tileFloat 5.8s ease-in-out infinite}
.tile:nth-child(3n+2) .tile-button{animation-delay:-1.9s}
.tile:nth-child(3n+3) .tile-button{animation-delay:-3.7s}
.tile.is-flipped .tile-button,.tile-button:hover,.tile-button:focus-visible{animation-play-state:paused}
.tile.is-flipped .tile-button{transform:none}
.tile-hint{animation:hintNudge 2.6s ease-in-out infinite}
.tile.is-flipped .tile-hint{animation-play-state:paused}
@keyframes tileFloat{0%,100%{transform:translate3d(0,0,0)}50%{transform:translate3d(0,-2px,0)}}
@keyframes hintNudge{0%,100%{opacity:.72;transform:translate3d(0,0,0)}50%{opacity:1;transform:translate3d(0,-3px,0)}}
@media(max-width:720px){.tile-button{animation-duration:6.4s}.tile-hint{animation-duration:3s}}
@media(prefers-reduced-motion:reduce){.tile-button,.tile-hint{animation:none}}


/* 2026-09-11: transparent top entrance menu */
.site-header nav{pointer-events:auto}
.hall-menu{position:relative}
.hall-menu summary{list-style:none;display:flex;align-items:center;gap:8px;padding:9px 12px;border:1px solid rgba(23,61,53,.18);border-radius:4px;background:rgba(247,250,247,.18);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);cursor:pointer;transition:background .2s,border-color .2s}
.hall-menu summary::-webkit-details-marker{display:none}
.hall-menu summary:hover,.hall-menu[open] summary{background:rgba(247,250,247,.5);border-color:rgba(23,61,53,.34)}
.hall-menu-panel{position:absolute;right:0;top:calc(100% + 10px);width:246px;padding:7px;border:1px solid rgba(255,255,255,.58);border-radius:7px;background:rgba(247,250,247,.68);backdrop-filter:blur(16px) saturate(115%);-webkit-backdrop-filter:blur(16px) saturate(115%);box-shadow:0 18px 46px rgba(17,45,36,.18)}
.hall-menu-panel a{display:flex;flex-direction:column;gap:3px;padding:11px 12px;border-radius:5px;color:var(--ink)}
.hall-menu-panel a:hover{background:rgba(255,255,255,.58)}
.hall-menu-panel a+a{border-top:1px dashed rgba(23,61,53,.2)}
.hall-menu-panel span{font-size:12px;font-weight:650}
.hall-menu-panel small{font-size:9px;font-weight:400;color:var(--muted)}
.stage-bottom{justify-content:flex-start}
@media(max-width:720px) and (orientation:portrait){
  .hall-menu summary{padding:7px 9px}
  .hall-menu-panel{width:min(238px,calc(100vw - 40px))}
}


/* 2026-09-11 v2: coordinated macaron ink-doodle language */
:root{--ink:#244b43;--muted:#617970;--paper:#fff8ee;--coral:#e77f69;--line:rgba(36,75,67,.18)}
body{background:#fff8ee}
.campus-stage{background:#dcebd5}
.photo-shade{background:
  radial-gradient(circle at 12% 16%,rgba(248,209,193,.42),transparent 24%),
  radial-gradient(circle at 86% 23%,rgba(207,232,218,.38),transparent 25%),
  radial-gradient(circle at 76% 84%,rgba(205,229,240,.27),transparent 28%),
  linear-gradient(180deg,rgba(255,248,238,.91) 0%,rgba(255,248,238,.63) 13%,rgba(255,248,238,.08) 39%,transparent 56%,rgba(24,54,47,.46) 100%)}
.site-header,.intro{color:var(--ink)}
.hall-menu-panel{background:rgba(255,248,238,.74)}
.next-chapter,.source-note,footer{background:linear-gradient(90deg,rgba(248,209,193,.12),rgba(207,232,218,.12),rgba(205,229,240,.12))}
.next-chapter{border-top:1px solid rgba(36,75,67,.1)}
.hall-link{background:var(--ink)}