:root{
  --paper:#EFF2ED;
  --paper-deep:#E3EAE3;
  --ink:#1B2420;
  --ink-soft:#41504A;
  --celadon:#7E9E90;
  --celadon-deep:#3D5A4D;
  --seal:#A63A2B;
  --hairline:rgba(27,36,32,.16);
  --serif:"Spectral","Noto Serif SC",serif;
  --sc:"Noto Serif SC","Spectral",serif;
  --tc:"Noto Serif TC","Noto Serif SC","Spectral",serif;
  --cjk:var(--sc);
  --mono:"IBM Plex Mono",monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--serif);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
/* Chinese modes: CJK-first typography */
body[data-lang="bh"]{font-family:var(--sc)}
body[data-lang="wy"]{font-family:var(--tc)}
body[data-lang="bh"] h1,body[data-lang="bh"] h2,
body[data-lang="wy"] h1,body[data-lang="wy"] h2{letter-spacing:.04em;font-weight:500;line-height:1.28}
body[data-lang="bh"] p,body[data-lang="wy"] p{line-height:1.95}
body[data-lang="wy"] .thesis,body[data-lang="wy"] .lede{letter-spacing:.05em}
::selection{background:var(--celadon);color:var(--paper)}

/* ---------- language switch ---------- */
.langs{
  position:fixed;top:18px;right:22px;z-index:60;display:flex;
  border:1px solid var(--hairline);background:rgba(239,242,237,.92);backdrop-filter:blur(4px);
}
.langs button{
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  background:none;border:none;border-right:1px solid var(--hairline);
  padding:8px 13px;color:var(--ink-soft);cursor:pointer;
}
.langs button:last-child{border-right:none}
.langs button[aria-pressed="true"]{background:var(--celadon-deep);color:var(--paper)}
.langs button:focus-visible{outline:2px solid var(--seal);outline-offset:2px}

/* ---------- spine nav ---------- */
.spine{
  position:fixed;top:0;left:0;bottom:0;width:72px;
  border-right:1px solid var(--hairline);
  display:flex;flex-direction:column;align-items:center;
  padding:28px 0;z-index:40;background:var(--paper);
}
.spine .mark{
  font-family:var(--cjk);font-weight:700;font-size:15px;
  writing-mode:vertical-rl;letter-spacing:.35em;color:var(--celadon-deep);
  text-decoration:none;
}
.spine nav{margin-top:auto;margin-bottom:auto;display:flex;flex-direction:column;gap:26px}
.spine nav a{
  writing-mode:vertical-rl;text-decoration:none;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.28em;
  text-transform:uppercase;color:var(--ink-soft);
  transition:color .25s;
}
body[data-lang="bh"] .spine nav a{font-family:var(--sc);font-size:13px;letter-spacing:.4em}
body[data-lang="wy"] .spine nav a{font-family:var(--tc);font-size:13px;letter-spacing:.4em}
.spine nav a:hover,.spine nav a:focus-visible{color:var(--seal)}
.spine nav a:focus-visible{outline:2px solid var(--seal);outline-offset:3px}
.spine .foot{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.2em;
  writing-mode:vertical-rl;color:var(--celadon)}

main{margin-left:72px}
section{padding:96px clamp(28px,7vw,120px);border-bottom:1px solid var(--hairline);position:relative}

/* eyebrow */
.eyebrow{
  display:flex;align-items:center;gap:14px;
  font-family:var(--mono);font-size:11px;letter-spacing:.3em;text-transform:uppercase;
  color:var(--celadon-deep);margin-bottom:34px;
}
body[data-lang="bh"] .eyebrow,body[data-lang="wy"] .eyebrow{font-family:inherit;font-size:14px;letter-spacing:.5em;text-transform:none}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--celadon-deep)}

/* ---------- hero ---------- */
.hero{
  min-height:100vh;display:grid;
  grid-template-columns:1fr auto;gap:clamp(24px,5vw,90px);
  align-items:center;
  padding-top:70px;padding-bottom:70px;
  background:
    radial-gradient(1100px 620px at 82% 10%,rgba(126,158,144,.16),transparent 60%),
    var(--paper);
  border-bottom:1px solid var(--hairline);
}
.hero .inst{
  font-family:var(--mono);font-size:11px;letter-spacing:.3em;text-transform:uppercase;
  color:var(--ink-soft);margin-bottom:26px;
}
body[data-lang="bh"] .hero .inst,body[data-lang="wy"] .hero .inst{font-family:inherit;font-size:14px;letter-spacing:.32em;text-transform:none}
.hero h1{
  font-weight:300;font-size:clamp(38px,5.4vw,74px);line-height:1.06;
  letter-spacing:-.015em;
}
body[data-lang="bh"] .hero h1,body[data-lang="wy"] .hero h1{font-size:clamp(34px,4.6vw,62px);letter-spacing:.1em}
.hero h1 b{font-weight:600;color:var(--celadon-deep)}
.hero .sub-title{
  font-family:var(--cjk);font-weight:500;
  font-size:clamp(19px,2.2vw,28px);letter-spacing:.42em;
  color:var(--ink-soft);margin-top:18px;
}
body[data-lang="bh"] .hero .sub-title,body[data-lang="wy"] .hero .sub-title{
  font-family:"Spectral",serif;font-weight:300;letter-spacing:.06em;font-size:clamp(15px,1.6vw,20px)}
.hero p.thesis{
  max-width:56ch;margin-top:34px;font-size:clamp(17px,1.35vw,20px);
  font-weight:300;color:var(--ink-soft);
}
.hero p.thesis em{font-style:italic;color:var(--ink)}
body[data-lang="bh"] .hero p.thesis em,body[data-lang="wy"] .hero p.thesis em{font-style:normal;font-weight:600;color:var(--ink)}
.principle{
  margin-top:40px;display:inline-block;
  border:1px solid var(--hairline);border-left:3px solid var(--celadon-deep);
  background:rgba(255,255,255,.45);
  padding:18px 26px;
}
.principle .f{font-family:var(--mono);font-size:clamp(14px,1.35vw,18px);color:var(--ink)}
.principle .f .h{color:var(--seal)}
.principle .g{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--ink-soft);margin-top:8px;max-width:52ch}
body[data-lang="bh"] .principle .g,body[data-lang="wy"] .principle .g{font-family:inherit;font-size:13.5px;letter-spacing:.06em}
.hero .cta-row{margin-top:44px;display:flex;gap:16px;flex-wrap:wrap}
.btn{
  font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;
  text-decoration:none;padding:13px 26px;border:1px solid var(--ink);
  color:var(--ink);transition:background .25s,color .25s;
}
body[data-lang="bh"] .btn,body[data-lang="wy"] .btn{font-family:inherit;font-size:14px;letter-spacing:.3em;text-transform:none}
.btn:hover,.btn:focus-visible{background:var(--ink);color:var(--paper)}
.btn.accent{border-color:var(--celadon-deep);color:var(--celadon-deep)}
.btn.accent:hover,.btn.accent:focus-visible{background:var(--celadon-deep);color:var(--paper)}
.btn:focus-visible{outline:2px solid var(--seal);outline-offset:3px}

/* signature: vertical maxim scroll + seal */
.maxim{
  display:flex;gap:26px;align-items:flex-start;
  padding:34px 26px 42px;
  border-left:1px solid var(--hairline);
  height:min(560px,72vh);
}
.maxim .col{
  writing-mode:vertical-rl;text-orientation:upright;
  font-family:var(--tc);font-weight:500;
  font-size:clamp(22px,2.4vw,32px);letter-spacing:.42em;
  color:var(--ink);
}
.maxim .col.second{color:var(--ink-soft);font-weight:400;font-size:clamp(17px,1.8vw,24px)}
.maxim .seal{
  align-self:flex-end;
  width:56px;height:56px;flex:0 0 auto;
  background:var(--seal);color:#F5EEE6;
  display:grid;place-items:center;
  font-family:var(--tc);font-weight:700;font-size:19px;line-height:1.05;
  letter-spacing:.06em;text-align:center;
  border-radius:4px;
  box-shadow:0 1px 0 rgba(27,36,32,.25) inset;
  transform:rotate(-2deg);
}

/* ---------- section headers ---------- */
h2{
  font-weight:300;font-size:clamp(30px,3.4vw,48px);line-height:1.12;letter-spacing:-.01em;
  max-width:24ch;
}
body[data-lang="bh"] h2,body[data-lang="wy"] h2{font-size:clamp(26px,3vw,42px)}
h2 b{font-weight:600;color:var(--celadon-deep)}
.lede{max-width:62ch;margin-top:22px;color:var(--ink-soft);font-weight:300;font-size:18px}
.lede strong{color:var(--ink);font-weight:500}

/* ---------- framework ---------- */
.apparatus{
  margin-top:48px;display:grid;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  border-top:1px solid var(--hairline);border-left:1px solid var(--hairline);
}
.apparatus .cell{
  border-right:1px solid var(--hairline);border-bottom:1px solid var(--hairline);
  padding:24px 22px;
}
.apparatus .sym{font-family:var(--mono);font-size:20px;color:var(--celadon-deep)}
.apparatus .nm{font-weight:600;font-size:15px;margin-top:8px}
.apparatus .ds{font-size:14px;color:var(--ink-soft);margin-top:6px;line-height:1.55}
body[data-lang="bh"] .apparatus .ds,body[data-lang="wy"] .apparatus .ds{line-height:1.85}

.family{margin-top:56px;display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1px;background:var(--hairline);border:1px solid var(--hairline)}
.dom{background:var(--paper);padding:26px 24px;transition:background .3s}
.dom:hover{background:var(--paper-deep)}
.dom .code{font-family:var(--mono);font-size:12px;letter-spacing:.18em;color:var(--seal)}
.dom h3{font-size:19px;font-weight:600;margin-top:8px}
.dom p{font-size:14.5px;color:var(--ink-soft);margin-top:10px;line-height:1.6}
body[data-lang="bh"] .dom p,body[data-lang="wy"] .dom p{line-height:1.9}
.dom.primary{border-top:3px solid var(--celadon-deep)}

.maxim-strip{
  margin-top:56px;text-align:center;
  font-family:var(--tc);font-size:clamp(19px,2.2vw,27px);
  letter-spacing:.3em;color:var(--celadon-deep);font-weight:500;
}
.maxim-strip .en{
  display:block;font-family:var(--serif);font-style:italic;font-weight:300;
  font-size:15px;letter-spacing:.02em;color:var(--ink-soft);margin-top:12px;
}
body[data-lang="bh"] .maxim-strip .en{font-family:var(--sc);font-style:normal;letter-spacing:.1em}
body[data-lang="wy"] .maxim-strip .en{font-family:var(--tc);font-style:normal;letter-spacing:.1em}

/* ---------- RIDE-I ---------- */
.ride{
  margin-top:56px;display:grid;
  grid-template-columns:repeat(5,1fr);
  border-top:1px solid var(--ink);
}
.stage{padding:26px 18px 8px;border-right:1px solid var(--hairline);position:relative}
.stage:last-child{border-right:none}
.stage .n{font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--seal)}
.stage h3{font-size:20px;font-weight:600;margin-top:10px}
.stage .cn{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--celadon-deep);font-weight:500;margin-top:4px;text-transform:uppercase}
.stage p{font-size:13.5px;color:var(--ink-soft);margin-top:12px;line-height:1.6}
body[data-lang="bh"] .stage p,body[data-lang="wy"] .stage p{line-height:1.85}
.ride-note{margin-top:34px;font-size:15px;color:var(--ink-soft);max-width:66ch;font-weight:300}
.ride-note b{color:var(--ink);font-weight:500}

/* RIDE-I — theoretical structure (the lattice + symmetry theorem) */
.ri-lattice{margin-top:44px;font-size:16px;color:var(--ink-soft);max-width:72ch;font-weight:300;line-height:1.7}
.ri-lattice b{color:var(--ink);font-weight:500}
body[data-lang="bh"] .ri-lattice,body[data-lang="wy"] .ri-lattice{line-height:1.95}

.axis-label{margin-top:42px;display:flex;align-items:center;gap:12px;font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--seal)}
.axis-label::before{content:"";width:22px;height:1px;background:var(--celadon-deep)}
body[data-lang="bh"] .axis-label,body[data-lang="wy"] .axis-label{font-family:inherit;font-size:13px;letter-spacing:.14em;text-transform:none}
.axis-label + .apparatus,.axis-label + .components,.axis-label + .ride{margin-top:16px}

.components{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--hairline);border-left:1px solid var(--hairline)}
.components .comp{border-right:1px solid var(--hairline);border-bottom:1px solid var(--hairline);padding:20px 20px}
.components .comp .k{font-family:var(--mono);font-size:20px;color:var(--celadon-deep)}
.components .comp .v{font-weight:600;font-size:15px;margin-top:8px}
.components .comp .d{font-size:13px;color:var(--ink-soft);margin-top:6px;line-height:1.55}
body[data-lang="bh"] .components .comp .d,body[data-lang="wy"] .components .comp .d{line-height:1.8}

.symmetry{margin-top:60px;border:1px solid var(--ink);background:rgba(255,255,255,.42);padding:36px 34px 30px}
.symmetry h3{font-size:clamp(20px,2vw,25px);font-weight:600;margin-top:16px;line-height:1.3}
.symmetry h3 b{color:var(--celadon-deep);font-weight:600}
.sym-eq{margin:26px 0 8px;text-align:center;font-family:var(--mono);font-size:clamp(15px,1.7vw,21px);letter-spacing:.06em;color:var(--ink)}
.sym-eq .op{color:var(--seal);padding:0 14px;font-size:1.15em}
.sym-row{display:grid;grid-template-columns:132px 1fr;gap:20px;padding:18px 0;border-top:1px solid var(--hairline);font-size:14.5px;line-height:1.65}
.sym-row .lab{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--celadon-deep);padding-top:3px}
.sym-row .txt{color:var(--ink-soft)}
.sym-row .txt b{color:var(--ink);font-weight:500}
body[data-lang="bh"] .sym-row,body[data-lang="wy"] .sym-row{line-height:1.9}
body[data-lang="bh"] .sym-row .lab,body[data-lang="wy"] .sym-row .lab{font-family:inherit;letter-spacing:.1em;text-transform:none}
.axis-legend-tag{color:var(--celadon-deep);opacity:.72;text-transform:none;letter-spacing:normal}
body[data-lang="bh"] .axis-legend-tag,body[data-lang="wy"] .axis-legend-tag{letter-spacing:.04em}

/* interactive framework cube */
.cube-wrap{margin-top:46px;display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:38px;align-items:start}
.cube-hint{grid-column:1 / -1;font-size:14.5px;color:var(--ink-soft);font-weight:300;line-height:1.65;max-width:82ch;margin-bottom:4px}
.cube-hint b{color:var(--ink);font-weight:500}
.cube-visual{min-width:0}
.cube-svg{width:100%;height:auto;display:block;touch-action:none;cursor:grab;font-family:var(--mono);-webkit-user-select:none;user-select:none}
.cube-svg.dragging{cursor:grabbing}
.cube-svg polygon.face{stroke-linejoin:round;cursor:pointer}
.cube-svg polygon.face.sel{stroke:#C6902B !important;stroke-width:3.4 !important}
.cube-svg polygon.face.dim{opacity:.2}
.cube-tick{font-size:11px;font-weight:600;paint-order:stroke;stroke:var(--paper);stroke-width:3px;pointer-events:none}
.cube-tick.tk-commit{fill:var(--seal)}
.cube-tick.tk-comp{fill:var(--celadon-deep)}
.cube-tick.tk-stage{fill:var(--ink-soft)}
body[data-lang="bh"] .cube-tick,body[data-lang="wy"] .cube-tick{font-family:var(--sc)}
.cube-tools{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:10px}
.cube-drag-hint{font-family:var(--mono);font-size:10.5px;letter-spacing:.06em;color:var(--ink-soft)}
.cube-tip{position:fixed;pointer-events:none;background:var(--ink);color:var(--paper);font-family:var(--mono);font-size:11px;padding:4px 9px;border-radius:2px;opacity:0;transition:opacity .12s;white-space:nowrap;z-index:95}

.cube-panel{border:1px solid var(--ink);background:rgba(255,255,255,.5);padding:24px 24px 20px;min-height:264px;display:flex;flex-direction:column}
.cube-coord{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.cube-coord .chip{font-family:var(--mono);font-size:11px;letter-spacing:.08em;padding:4px 9px;border:1px solid var(--celadon);color:var(--celadon-deep);white-space:nowrap}
.cube-coord .chip.stage{border-color:var(--seal);color:var(--seal)}
.cube-coord .x{color:var(--ink-soft);font-family:var(--mono);font-size:12px}
.cube-body{margin-top:16px;font-size:14.5px;line-height:1.7;color:var(--ink-soft);flex:1;white-space:pre-wrap}
body[data-lang="bh"] .cube-body,body[data-lang="wy"] .cube-body{line-height:1.95}
.cube-body.placeholder{opacity:.6;font-style:italic;display:flex;align-items:center;justify-content:center;text-align:center;padding:0 6px}
.cube-body .cube-typing{animation:cubePulse 1.15s ease-in-out infinite}
@keyframes cubePulse{0%,100%{opacity:.4}50%{opacity:1}}
.cube-meta{margin-top:14px;display:flex;justify-content:space-between;align-items:center;gap:12px;border-top:1px solid var(--hairline);padding-top:12px}
.cube-meta .prov{font-family:var(--mono);font-size:10px;letter-spacing:.06em;color:var(--ink-soft)}
.cube-regen{font-family:var(--mono);font-size:11px;letter-spacing:.05em;color:var(--celadon-deep);background:none;border:1px solid var(--celadon);padding:5px 12px;cursor:pointer;transition:background .25s,color .25s}
.cube-regen:hover{background:var(--celadon-deep);color:var(--paper);border-color:var(--celadon-deep)}
.cube-regen:disabled{opacity:.4;cursor:default}
@media (max-width:840px){
  .cube-wrap{grid-template-columns:1fr;gap:26px}
  .cube-panel{min-height:0}
}

/* launch trigger — cube lives in a popup, this stays inline */
.cube-launch{display:flex;align-items:center;gap:20px;width:100%;text-align:left;margin-top:38px;
  padding:22px 24px;background:rgba(255,255,255,.42);border:1px solid var(--hairline);
  cursor:pointer;font:inherit;color:inherit;transition:border-color .3s,transform .3s,background .3s}
.cube-launch:hover,.cube-launch:focus-visible{border-color:var(--celadon-deep);transform:translateY(-2px);background:rgba(255,255,255,.62);outline:none}
.cube-launch:focus-visible{box-shadow:0 0 0 2px var(--celadon)}
.cube-launch-cube{flex:0 0 auto;color:var(--celadon-deep);display:flex}
.cube-launch-txt{flex:1;min-width:0;display:flex;flex-direction:column;gap:5px}
.cube-launch-txt b{font-size:16px;font-weight:600;color:var(--ink)}
.cube-launch-txt span{font-size:13.5px;font-weight:300;color:var(--ink-soft);line-height:1.55}
.cube-launch-arrow{flex:0 0 auto;font-family:var(--mono);font-size:20px;color:var(--seal);transition:transform .3s}
.cube-launch:hover .cube-launch-arrow{transform:translate(2px,-2px)}

/* cube popup modal */
.cube-modal{width:min(1060px,100%);height:min(88vh,880px)}
.cube-modal-body{flex:1;min-height:0;overflow:auto;padding:clamp(18px,3vw,30px);background:var(--paper)}
.cube-modal .cube-wrap{margin:0}

/* ---------- platforms ---------- */
.plat-grid{margin-top:52px;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:26px}
.plat{
  border:1px solid var(--hairline);background:rgba(255,255,255,.42);
  padding:26px 26px 22px;display:flex;flex-direction:column;
  transition:border-color .3s,transform .3s;
}
.plat:hover{border-color:var(--celadon-deep);transform:translateY(-3px)}
.plat .top{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.plat h3{font-size:20px;font-weight:600}
.plat .tag{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--celadon-deep);border:1px solid var(--celadon);padding:3px 8px;white-space:nowrap}
body[data-lang="bh"] .plat .tag,body[data-lang="wy"] .plat .tag{font-family:inherit;font-size:12px;letter-spacing:.2em;text-transform:none}
.plat p{font-size:14.5px;color:var(--ink-soft);margin-top:12px;line-height:1.62;flex:1}
body[data-lang="bh"] .plat p,body[data-lang="wy"] .plat p{line-height:1.9}
.plat a.link{
  margin-top:18px;font-family:var(--mono);font-size:12px;letter-spacing:.1em;
  color:var(--seal);text-decoration:none;
}
.plat a.link:hover,.plat a.link:focus-visible{text-decoration:underline;text-underline-offset:4px}
.plat .stack{margin-top:14px;font-family:var(--mono);font-size:10.5px;color:var(--celadon-deep);letter-spacing:.06em}
.plat-foot{margin-top:18px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.plat-foot .link{margin-top:0}
.plat-try{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  text-decoration:none;background:none;border:1px solid var(--hairline);color:var(--ink-soft);
  padding:7px 15px;cursor:pointer;transition:border-color .25s,color .25s,background .25s;
}
body[data-lang="bh"] .plat-try,body[data-lang="wy"] .plat-try{font-family:inherit;font-size:13px;letter-spacing:.2em;text-transform:none}
.plat-try:hover,.plat-try:focus-visible{border-color:var(--celadon-deep);color:var(--celadon-deep);background:rgba(255,255,255,.5)}
.plat-try:focus-visible{outline:2px solid var(--seal);outline-offset:2px}

/* ---------- teaser popup ---------- */
.tsr-overlay{
  position:fixed;inset:0;z-index:80;display:none;
  align-items:center;justify-content:center;padding:clamp(14px,4vw,48px);
  background:rgba(27,36,32,.55);backdrop-filter:blur(3px);
}
.tsr-overlay.open{display:flex}
.tsr-modal{
  background:var(--paper);border:1px solid var(--hairline);
  width:min(940px,100%);height:min(80vh,780px);
  display:flex;flex-direction:column;box-shadow:0 24px 70px rgba(27,36,32,.34);
}
@media (prefers-reduced-motion:no-preference){
  .tsr-overlay.open .tsr-modal{animation:tsr-in .28s ease}
}
@keyframes tsr-in{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.tsr-head{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:15px 20px;border-bottom:1px solid var(--hairline);flex:0 0 auto;
}
.tsr-title{font-weight:600;font-size:18px;line-height:1.3}
.tsr-ctl{display:flex;align-items:center;gap:18px}
.tsr-open{
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--seal);text-decoration:none;white-space:nowrap;
}
.tsr-open:hover,.tsr-open:focus-visible{text-decoration:underline;text-underline-offset:3px}
.tsr-x{background:none;border:none;font-size:26px;line-height:1;color:var(--ink-soft);cursor:pointer;padding:0 2px}
.tsr-x:hover,.tsr-x:focus-visible{color:var(--seal)}
.tsr-open:focus-visible,.tsr-x:focus-visible{outline:2px solid var(--seal);outline-offset:2px}
.tsr-body{flex:1;min-height:0;background:var(--paper-deep);position:relative}
.tsr-frame{width:100%;height:100%;border:0;background:var(--paper);display:block}
/* Shown in place of the iframe when a teaser's server forbids framing
   (X-Frame-Options / CSP frame-ancestors) — the frame would be blank otherwise. */
.tsr-fallback{
  position:absolute;inset:0;display:none;flex-direction:column;
  align-items:center;justify-content:center;gap:20px;text-align:center;
  padding:clamp(24px,6vw,56px);background:var(--paper);
}
.tsr-fallback.show{display:flex}
.tsr-fallback p{max-width:46ch;color:var(--ink-soft);font-size:15.5px;line-height:1.6}
.tsr-fallback .tsr-go{
  font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--paper);background:var(--celadon-deep);text-decoration:none;
  padding:12px 22px;border:1px solid var(--celadon-deep);
}
.tsr-fallback .tsr-go:hover,.tsr-fallback .tsr-go:focus-visible{background:var(--ink);border-color:var(--ink)}
.tsr-fallback .tsr-go:focus-visible{outline:2px solid var(--seal);outline-offset:2px}
@media (max-width:760px){.tsr-modal{height:88vh}}

/* ---------- scholarship ---------- */
.pubs{margin-top:48px;border-top:1px solid var(--ink)}
.pub{
  display:grid;grid-template-columns:110px 1fr;gap:26px;
  padding:26px 4px;border-bottom:1px solid var(--hairline);
}
.pub .kind{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--seal);padding-top:5px}
body[data-lang="bh"] .pub .kind,body[data-lang="wy"] .pub .kind{font-family:inherit;font-size:14px;letter-spacing:.3em;text-transform:none}
.pub h3{font-size:19px;font-weight:600;line-height:1.35}
.pub p{font-size:14.5px;color:var(--ink-soft);margin-top:8px;max-width:75ch;line-height:1.62}
body[data-lang="bh"] .pub p,body[data-lang="wy"] .pub p{line-height:1.9}

/* ---------- about / contact ---------- */
.about-grid{margin-top:48px;display:grid;grid-template-columns:1.4fr 1fr;gap:clamp(28px,5vw,80px)}
.about-grid p{color:var(--ink-soft);font-weight:300;margin-bottom:18px}
.about-grid p strong{color:var(--ink);font-weight:500}
.dl{border-top:1px solid var(--ink)}
.dl .row{display:grid;grid-template-columns:120px 1fr;gap:16px;padding:16px 2px;border-bottom:1px solid var(--hairline)}
.dl dt{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--celadon-deep);padding-top:4px}
body[data-lang="bh"] .dl dt,body[data-lang="wy"] .dl dt{font-family:inherit;font-size:13px;letter-spacing:.22em;text-transform:none}
.dl dd{font-size:15px}
.dl dd a{color:var(--seal);text-decoration:none}
.dl dd a:hover{text-decoration:underline;text-underline-offset:3px}

footer{
  margin-left:72px;padding:44px clamp(28px,7vw,120px);
  display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--ink-soft);
}
footer .cjk{font-family:var(--tc);letter-spacing:.4em;color:var(--celadon-deep)}

/* reveal on scroll */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .hero{grid-template-columns:1fr}
  .maxim{height:auto;border-left:none;border-top:1px solid var(--hairline);padding:28px 0 8px;
    flex-direction:row-reverse;justify-content:flex-end}
  .maxim .col{font-size:20px}
  .ride{grid-template-columns:1fr}
  .stage{border-right:none;border-bottom:1px solid var(--hairline);padding:22px 4px}
  .about-grid{grid-template-columns:1fr}
  .components{grid-template-columns:1fr 1fr}
  .sym-row{grid-template-columns:1fr;gap:4px}
  .sym-row .lab{padding-top:0}
}
@media (max-width:760px){
  .langs{top:auto;bottom:16px;right:16px}
  .spine{position:static;width:100%;height:auto;flex-direction:row;
    padding:14px 20px;border-right:none;border-bottom:1px solid var(--hairline);gap:18px}
  .spine .mark{writing-mode:horizontal-tb;letter-spacing:.3em}
  .spine nav{flex-direction:row;gap:16px;margin:0 0 0 auto;flex-wrap:wrap;justify-content:flex-end}
  .spine nav a{writing-mode:horizontal-tb;letter-spacing:.14em}
  .spine .foot{display:none}
  main,footer{margin-left:0}
  section{padding:64px 24px}
  .pub{grid-template-columns:1fr;gap:8px}
}
/* ============================================================
   ERTC — modern layer (PolyU crimson · research-instrument)
   Loaded AFTER the original design so these rules re-skin it:
   we override the legacy design tokens to a modern crimson/slate
   palette + Inter typography + dark theme, then add the new hub,
   top bar, and animated area cards.
   ============================================================ */

/* ---------- tokens: re-skin the legacy variables ---------- */
:root{
  --paper:#F4F6FA; --paper-deep:#EDF0F7;
  --ink:#0D1020; --ink-soft:#3A4058;
  --celadon:#5E6B96; --celadon-deep:#3D4A82;   /* secondary = cool slate */
  --seal:#A6192E; --seal-lit:#D81F3F;          /* primary  = PolyU crimson */
  --hairline:rgba(13,16,32,.12);
  --serif:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans SC",sans-serif;
  --sc:"Noto Sans SC","Inter",sans-serif;
  --tc:"Noto Sans TC","Noto Sans SC","Inter",sans-serif;
  --cjk:var(--sc);
  --mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
  /* new aux tokens */
  --bg:var(--paper); --surface:#FFFFFF; --surface-2:var(--paper-deep);
  --muted:#616981; --line:var(--hairline); --line-2:rgba(13,16,32,.055);
  --crimson:var(--seal); --crimson-lit:var(--seal-lit); --crimson-ink:var(--seal);
  --glow:rgba(166,25,46,.13); --node:var(--seal);
  --shadow:0 1px 2px rgba(13,16,32,.05),0 14px 40px -22px rgba(13,16,32,.26);
  --radius:15px;
}
@media (prefers-color-scheme:dark){
  :root{
    --paper:#070912; --paper-deep:#161A2B;
    --ink:#ECEFF8; --ink-soft:#C2C8DC;
    --celadon:#8891C0; --celadon-deep:#AAB4E6;
    --seal:#E23A54; --seal-lit:#FF5C74;
    --hairline:rgba(255,255,255,.12);
    --surface:#0F1220; --muted:#8992AC; --line-2:rgba(255,255,255,.05);
    --crimson:#E23A54; --crimson-lit:#FF5C74; --crimson-ink:#F26076;
    --glow:rgba(226,58,84,.16); --node:#F26076;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 20px 50px -24px rgba(0,0,0,.7);
  }
}
:root[data-theme="light"]{
  --paper:#F4F6FA; --paper-deep:#EDF0F7; --ink:#0D1020; --ink-soft:#3A4058;
  --celadon:#5E6B96; --celadon-deep:#3D4A82; --seal:#A6192E; --seal-lit:#D81F3F;
  --hairline:rgba(13,16,32,.12); --surface:#FFFFFF; --muted:#616981; --line-2:rgba(13,16,32,.055);
  --crimson:#A6192E; --crimson-lit:#D81F3F; --crimson-ink:#A6192E; --glow:rgba(166,25,46,.13); --node:#A6192E;
  --shadow:0 1px 2px rgba(13,16,32,.05),0 14px 40px -22px rgba(13,16,32,.26);
}
:root[data-theme="dark"]{
  --paper:#070912; --paper-deep:#161A2B; --ink:#ECEFF8; --ink-soft:#C2C8DC;
  --celadon:#8891C0; --celadon-deep:#AAB4E6; --seal:#E23A54; --seal-lit:#FF5C74;
  --hairline:rgba(255,255,255,.12); --surface:#0F1220; --muted:#8992AC; --line-2:rgba(255,255,255,.05);
  --crimson:#E23A54; --crimson-lit:#FF5C74; --crimson-ink:#F26076; --glow:rgba(226,58,84,.16); --node:#F26076;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 20px 50px -24px rgba(0,0,0,.7);
}

/* ---------- modern base tweaks over legacy ---------- */
body{font-family:var(--serif);font-weight:400;letter-spacing:-0.003em}
h1,h2,h3{font-weight:800;letter-spacing:-0.02em}
.legacy-hidden,.spine{display:none!important}   /* retire the fixed serif sidebar */
main{margin-left:0!important}
::selection{background:var(--crimson);color:#fff}

/* ============================================================
   TOP BAR  (shared: hub + section pages)
   ============================================================ */
.sitebar{
  display:flex;align-items:center;gap:18px;justify-content:space-between;
  padding:13px clamp(16px,4vw,54px);
  border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:blur(9px);position:relative;z-index:40;
}
.sitebar.sticky{position:sticky;top:0}
.sitebar .brand{display:flex;align-items:baseline;gap:11px;text-decoration:none;font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);white-space:nowrap}
.sitebar .brand b{color:var(--ink);font-weight:700;letter-spacing:.2em}
.sitebar .brand .dot{width:7px;height:7px;border-radius:50%;background:var(--crimson);align-self:center}
.sitebar .nav{display:flex;gap:4px;margin-right:auto;margin-left:8px}
.sitebar .nav a{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--muted);text-decoration:none;padding:6px 11px;border-radius:8px;transition:color .18s,background .18s}
.sitebar .nav a:hover{color:var(--ink);background:var(--surface-2)}
.sitebar .nav a.active{color:var(--crimson-ink)}
.sitebar .ctl{display:flex;align-items:center;gap:10px}
body[data-page="hub"] .sitebar .nav{display:none}

.langs{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;background:var(--surface);position:static;top:auto;right:auto;backdrop-filter:none}
.langs button{font-family:var(--mono);font-size:11px;letter-spacing:.05em;background:none;border:0;border-right:0;padding:7px 12px;color:var(--muted);cursor:pointer;transition:color .18s,background .18s}
.langs button[aria-pressed="true"]{color:#fff;background:var(--crimson)}
.langs button:not([aria-pressed="true"]):hover{color:var(--ink)}
.ask{display:inline-flex;align-items:center;gap:9px;font-family:var(--serif);font-size:13px;font-weight:600;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:7px 15px 7px 12px;cursor:pointer;box-shadow:var(--shadow);transition:border-color .2s,transform .2s}
.ask:hover{border-color:var(--crimson);transform:translateY(-1px)}
.ask .q{font-family:var(--cjk);color:var(--crimson-ink);font-size:15px;line-height:1}
.iconbtn{width:34px;height:34px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--muted);cursor:pointer;font-size:15px;display:grid;place-items:center;transition:color .2s,border-color .2s}
.iconbtn:hover{color:var(--ink);border-color:var(--crimson)}
.sitebar .ertc-account{position:static}

/* ============================================================
   HUB  (no-scroll landing)
   ============================================================ */
.hub{position:relative;z-index:1;height:100dvh;display:grid;grid-template-rows:auto minmax(0,1fr) auto;overflow:hidden}
.hub::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(60% 55% at 8% 0%,var(--glow),transparent 60%),
    linear-gradient(var(--line-2) 1px,transparent 1px),
    linear-gradient(90deg,var(--line-2) 1px,transparent 1px);
  background-size:auto,44px 44px,44px 44px;
  mask:linear-gradient(180deg,#000,transparent 82%);-webkit-mask:linear-gradient(180deg,#000,transparent 82%);
}
.hub>*{position:relative;z-index:1}
.hub-main{display:grid;grid-template-columns:minmax(0,0.86fr) minmax(0,1.14fr);gap:clamp(22px,3.2vw,54px);align-items:center;min-height:0;padding:clamp(10px,2vh,24px) clamp(16px,4vw,54px)}
.identity .eyebrow{font-family:var(--mono);font-size:11.5px;letter-spacing:.24em;text-transform:uppercase;color:var(--crimson-ink);display:flex;align-items:center;gap:10px;margin:0}
.identity .eyebrow::after{content:"";height:1px;flex:1;background:linear-gradient(90deg,var(--line),transparent)}
.identity h1{font-size:clamp(30px,4.4vw,52px);line-height:1.02;letter-spacing:-.03em;font-weight:800;margin:18px 0 8px;text-wrap:balance;border:0;padding:0}
.identity h1 .amp,.identity h1 b{color:var(--crimson-ink);font-weight:600}
.identity .sub-cjk{font-family:var(--cjk);font-size:clamp(15px,1.5vw,19px);letter-spacing:.14em;color:var(--muted);margin-bottom:16px}
.identity .thesis{max-width:46ch;color:var(--ink-soft);font-size:clamp(13.5px,1.05vw,15.5px);line-height:1.62;font-weight:400;margin:0}
.identity .thesis em{font-style:normal;font-weight:650;color:var(--ink);border-bottom:1.5px solid var(--crimson);padding-bottom:1px}
.plate{margin-top:clamp(16px,2.4vh,24px);border:1px solid var(--line);border-radius:12px;background:var(--surface);box-shadow:var(--shadow);overflow:hidden;max-width:430px}
.plate-top{display:flex;align-items:center;justify-content:space-between;padding:8px 13px;border-bottom:1px solid var(--line-2);font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.plate-top .tag{color:var(--crimson-ink)}
.plate-body{padding:15px 16px 13px}
.formula{font-family:var(--mono);font-size:clamp(16px,1.7vw,20px);color:var(--ink);letter-spacing:.01em}
.formula .k{color:var(--crimson-ink)}.formula sub{font-size:.62em}
.plate-cap{margin-top:9px;font-size:12px;color:var(--muted);line-height:1.5}
/* director signature — balances the identity column against the card grid */
.director{display:flex;align-items:center;gap:14px;margin-top:clamp(14px,2.4vh,24px)}
.director img{width:58px;height:80px;object-fit:cover;object-position:50% 12%;border-radius:11px;border:1px solid var(--line);box-shadow:var(--shadow);flex:0 0 auto}
.director figcaption{font-size:13px;line-height:1.4;color:var(--ink-soft)}
.director figcaption b{color:var(--ink);font-weight:700}
.director figcaption .cjk{font-family:var(--cjk);color:var(--muted);font-style:normal;margin-left:5px}
.director figcaption span{display:block;font-family:var(--mono);font-size:10.5px;letter-spacing:.02em;color:var(--muted);margin-top:4px;text-transform:uppercase}

/* bento of areas — 3×3 grid of compact cards */
.bento{display:grid;grid-template-columns:repeat(3,1fr);grid-auto-rows:1fr;gap:clamp(8px,1vw,13px);min-height:0;height:100%}
.card{position:relative;display:flex;flex-direction:column;justify-content:flex-start;gap:7px;text-decoration:none;color:inherit;
  background:
    radial-gradient(125% 96% at 82% 122%,hsl(var(--h1) var(--reel-s) var(--reel-l) / .11),transparent 68%),
    var(--surface);
  border:1px solid hsl(var(--h1) var(--reel-s) var(--reel-l) / .28);border-radius:13px;padding:clamp(12px,1.15vw,16px) clamp(13px,1.2vw,17px) clamp(30px,3.4vh,40px);box-shadow:var(--shadow);overflow:hidden;transition:transform .28s cubic-bezier(.2,.7,.3,1),border-color .22s,box-shadow .28s}
/* living panel — a faint tech grid that drifts on its own, filling the card */
.card::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    linear-gradient(var(--line-2) 1px,transparent 1px),
    linear-gradient(90deg,var(--line-2) 1px,transparent 1px);
  background-size:22px 22px,22px 22px;background-position:0 0,0 0;
  opacity:.85;transition:opacity .28s;
  -webkit-mask:radial-gradient(135% 100% at 82% 108%,#000,transparent 74%);
          mask:radial-gradient(135% 100% at 82% 108%,#000,transparent 74%);
  animation:card-grid 20s linear infinite;
}
.card:hover::before{opacity:1}
@keyframes card-grid{to{background-position:22px 22px,22px 22px}}
/* hover / keyboard-focus lifts the card forward and enlarges it ("stands out") */
.card:hover,.card:focus-visible{transform:translateY(-5px) scale(1.08);z-index:5}
.card:focus-visible{outline:2px solid var(--crimson);outline-offset:3px}
.card>.head,.card>h3,.card>div,.card>p,.card>.go{position:relative;z-index:1}
.card .idx{font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--muted)}
.card:hover .idx{color:var(--crimson-ink)}
.card h3{font-size:clamp(12.5px,1.05vw,15px);letter-spacing:-.01em;font-weight:750;line-height:1.1;display:flex;align-items:baseline;gap:7px;flex-wrap:wrap;border:0;padding:0;margin:0}
.card h3 .zh{font-family:var(--cjk);font-size:.76em;font-weight:500;color:var(--muted);letter-spacing:.04em}
.card .go{position:absolute;right:clamp(11px,1.1vw,15px);bottom:clamp(9px,1vh,13px);z-index:2;font-family:var(--mono);font-size:16px;color:var(--muted);transition:color .2s,transform .2s}
.card:hover .go{color:var(--crimson-ink);transform:translateX(3px)}
.card .head{display:flex;align-items:flex-start;justify-content:space-between;gap:8px}
/* per-theme neon rendering — bright & electric on dark, saturated-darker on light.
   Each card supplies its own hue trio (--h1/--h2/--h3); colour is composed from it. */
:root{ --reel-s:82%; --reel-l:42%; --reel-l2:45%; --reel-ga:.16; }
@media (prefers-color-scheme:dark){:root{ --reel-s:96%; --reel-l:70%; --reel-l2:66%; --reel-ga:.5; }}
:root[data-theme="light"]{ --reel-s:82%; --reel-l:42%; --reel-l2:45%; --reel-ga:.16; }
:root[data-theme="dark"]{ --reel-s:96%; --reel-l:70%; --reel-l2:66%; --reel-ga:.5; }
.card{--h1:350;--h2:8;--h3:330;--flow-dur:7s}   /* default hue (overridden per card) */

/* looping teaser reel — cinematic, neon HUD headline that focuses into view */
.card .teaser{position:relative;min-height:3.6em;margin:6px 0 0;padding-left:19px}
/* pulsing prompt marker — a small terminal/HUD cue at the head of the reel */
.card .teaser::before{
  content:"\25B8";position:absolute;left:0;top:1px;
  font-size:14px;font-weight:700;line-height:1.4;
  color:hsl(var(--h1) var(--reel-s) var(--reel-l2));text-shadow:0 0 8px currentColor;
  animation:teaser-blip 2.4s steps(1) infinite;
}
@keyframes teaser-blip{0%,58%{opacity:.85}59%,100%{opacity:.28}}
.card .teaser b{
  position:absolute;left:18px;top:0;right:0;
  opacity:0;transform:translateY(11px) scale(.985);filter:blur(5px);
  transition:opacity .5s ease,transform .6s cubic-bezier(.16,.84,.28,1),filter .5s ease;
  font-family:"Chakra Petch",var(--mono);
  font-size:clamp(13px,1.2vw,15.5px);line-height:1.36;font-weight:600;
  letter-spacing:.02em;text-wrap:balance;
  color:hsl(var(--h1) var(--reel-s) var(--reel-l));   /* solid fallback */
  text-shadow:0 0 10px hsl(var(--h2) var(--reel-s) var(--reel-l) / var(--reel-ga));
}
.card .teaser b.on{opacity:1;transform:translateY(0) scale(1);filter:blur(0)}
/* blinking caret trailing the live line — terminal cue */
.card .teaser b.on::after{
  content:"";display:inline-block;width:.5em;height:1.02em;margin-left:.3em;
  vertical-align:-.16em;border-radius:1px;opacity:.9;
  background:hsl(var(--h3) var(--reel-s) var(--reel-l));
  box-shadow:0 0 9px hsl(var(--h3) var(--reel-s) var(--reel-l));
  animation:teaser-caret 1.05s steps(1) infinite;
}
@keyframes teaser-caret{50%{opacity:0}}
/* flowing neon gradient — continuous sweep through the card's hue trio */
@supports ((-webkit-background-clip:text) or (background-clip:text)){
  .card .teaser b{
    background-image:linear-gradient(96deg,
      hsl(var(--h1) var(--reel-s) var(--reel-l)) 0%,
      hsl(var(--h2) var(--reel-s) var(--reel-l)) 34%,
      hsl(var(--h3) var(--reel-s) var(--reel-l)) 66%,
      hsl(var(--h1) var(--reel-s) var(--reel-l)) 100%);
    background-size:230% 100%;background-position:0 0;
    -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
    animation:teaser-flow var(--flow-dur) linear infinite;
  }
}
@keyframes teaser-flow{to{background-position:-230% 0}}

/* ── per-card identity: distinct hue trio, flow speed & display font across the 3×3 ── */
.bento .card:nth-child(1){--h1:350;--h2:10;--h3:330;--flow-dur:6.5s}   /* crimson→rose  */
.bento .card:nth-child(2){--h1:270;--h2:296;--h3:244;--flow-dur:8s}    /* violet→indigo */
.bento .card:nth-child(3){--h1:190;--h2:204;--h3:168;--flow-dur:5.5s}  /* cyan→teal     */
.bento .card:nth-child(4){--h1:40;--h2:22;--h3:54;--flow-dur:7.5s}     /* amber→gold    */
.bento .card:nth-child(5){--h1:150;--h2:132;--h3:172;--flow-dur:6s}    /* emerald→spring*/
.bento .card:nth-child(6){--h1:322;--h2:342;--h3:300;--flow-dur:8.5s}  /* magenta→pink  */
.bento .card:nth-child(7){--h1:222;--h2:240;--h3:200;--flow-dur:7s}    /* azure→blue    */
.bento .card:nth-child(8){--h1:28;--h2:46;--h3:8;--flow-dur:6.2s}      /* orange→ember  */
.bento .card:nth-child(9){--h1:168;--h2:190;--h3:148;--flow-dur:9s}    /* aqua→jade     */
/* rotate the display face so neighbours never share a font */
.bento .card:nth-child(3n+2) .teaser b{font-family:"Space Grotesk","Chakra Petch",var(--mono);letter-spacing:-.005em}
.bento .card:nth-child(3n)   .teaser b{font-family:"Rajdhani","Chakra Petch",var(--mono);font-weight:700;letter-spacing:.03em;font-size:clamp(14px,1.34vw,17.5px)}

@media (prefers-reduced-motion:reduce){
  .card .teaser b{transition:opacity .25s ease;transform:none;filter:none;animation:none;background-position:0 0}
  .card .teaser b.on::after,.card .teaser::before{animation:none}
}

.hub-foot{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:clamp(10px,1.6vh,18px) clamp(16px,4vw,54px);font-size:11.5px;color:var(--muted);border-top:1px solid var(--line);border-bottom:0}
.hub-foot .tele{font-family:var(--mono);letter-spacing:.05em;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.hub-foot .tele .on{display:inline-flex;align-items:center;gap:6px}
.hub-foot .tele .on::before{content:"";width:6px;height:6px;border-radius:50%;background:#2ecc71;box-shadow:0 0 0 3px rgba(46,204,113,.18)}
.hub-foot .cjk{font-family:var(--cjk);letter-spacing:.1em}

/* ---------- animated SVG motifs ---------- */
.motif{position:absolute;inset:auto 0 -2px 0;height:80%;width:100%;z-index:0;opacity:.82;pointer-events:none;transition:opacity .28s}
.card:hover .motif{opacity:1}
:root[data-theme="dark"] .motif{opacity:.86}
@media (prefers-color-scheme:dark){.motif{opacity:.86}}
:root[data-theme="light"] .motif{opacity:.8}
.motif .ln{stroke:var(--muted);stroke-width:1.5;fill:none}
.motif .nd{fill:var(--muted)}
/* accent nodes/lines glow in the card's own hue */
.motif .c-ln{stroke:hsl(var(--h1) var(--reel-s) var(--reel-l2));fill:none}
.motif .c{stroke:hsl(var(--h1) var(--reel-s) var(--reel-l2));fill:hsl(var(--h1) var(--reel-s) var(--reel-l2))}
/* chrome (hover border, index, arrow, focus ring) picks up the same hue,
   and a hue-tinted halo makes the lifted card glow in its own colour */
.card:hover,.card:focus-within{
  border-color:hsl(var(--h1) var(--reel-s) var(--reel-l2));
  box-shadow:0 24px 60px -20px hsl(var(--h1) var(--reel-s) var(--reel-l) / .55),var(--shadow);
}
.card:hover .idx,.card:hover .go,
.card:focus-within .idx,.card:focus-within .go{color:hsl(var(--h1) var(--reel-s) var(--reel-l2))}
.card:focus-visible{outline-color:hsl(var(--h1) var(--reel-s) var(--reel-l2))}
.card:hover .teaser b,.card:focus-within .teaser b{
  text-shadow:0 0 15px hsl(var(--h2) var(--reel-s) var(--reel-l) / calc(var(--reel-ga) + .18));
}
/* soft ambient bloom in the motif corner — dim at rest, blooms on hover */
.card::after{
  content:"";position:absolute;right:-8%;bottom:-8%;width:62%;height:58%;z-index:0;pointer-events:none;
  background:radial-gradient(closest-side,hsl(var(--h1) var(--reel-s) var(--reel-l) / .16),transparent 72%);
  opacity:.5;transition:opacity .3s;
}
.card:hover::after,.card:focus-within::after{opacity:1}

/* ── motion is a hover reward: every card rests still, powers on when pointed at ── */
.card::before,
.card .motif *,
.card .teaser b,
.card .teaser b.on::after,
.card .teaser::before{animation-play-state:paused}
.card:hover::before,        .card:focus-within::before,
.card:hover .motif *,        .card:focus-within .motif *,
.card:hover .teaser b,        .card:focus-within .teaser b,
.card:hover .teaser b.on::after,.card:focus-within .teaser b.on::after,
.card:hover .teaser::before,   .card:focus-within .teaser::before{animation-play-state:running}
@keyframes drift{50%{transform:translate(5px,-4px)}}
@keyframes drift2{50%{transform:translate(-6px,3px)}}
@keyframes pulse{0%,100%{opacity:.35}50%{opacity:1}}
.f1{animation:drift 5.5s ease-in-out infinite;transform-box:view-box}
.f2{animation:drift2 6.5s ease-in-out infinite;transform-box:view-box}
.f3{animation:drift 4.5s ease-in-out infinite .8s;transform-box:view-box}
.anchor{animation:pulse 2.8s ease-in-out infinite}
.b1,.b2,.b3,.b4,.b5,.b6,.b7,.b8,.b9,.b10,.b11,.b12{animation:pulse 3s ease-in-out infinite}
.b2{animation-delay:.25s}.b3{animation-delay:.5s}.b4{animation-delay:.75s}.b5{animation-delay:1s}.b6{animation-delay:1.25s}
.b7{animation-delay:1.5s}.b8{animation-delay:.4s}.b9{animation-delay:.65s}.b10{animation-delay:.9s}.b11{animation-delay:1.15s}.b12{animation-delay:1.4s}
@keyframes travel{0%{transform:translateX(0);opacity:0}10%{opacity:1}90%{opacity:1}100%{transform:translateX(150px);opacity:0}}
.travel{animation:travel 3.4s linear infinite;transform-box:view-box}
@keyframes draw{0%{stroke-dashoffset:160}60%,100%{stroke-dashoffset:0}}
.draw{stroke-dasharray:160}
.d1{animation:draw 4s ease-in-out infinite}.d2{animation:draw 4s ease-in-out infinite .4s}
.d3{animation:draw 4s ease-in-out infinite .8s}.d4{animation:draw 4s ease-in-out infinite 1.2s}
@keyframes spin{to{transform:rotate(360deg)}}
.spin{transform-box:view-box;transform-origin:150px 30px}
.s1{animation:spin 9s linear infinite}.s2{animation:spin 13s linear infinite reverse}.s3{animation:spin 7s linear infinite}
.core{animation:pulse 3s ease-in-out infinite}
/* ride-i cube outline */
@keyframes breathe{0%,100%{transform:scale(1)}50%{transform:scale(1.06)}}
.cube-outline{transform-box:view-box;transform-origin:150px 30px;animation:breathe 5s ease-in-out infinite}
.cube-outline .v1{animation:pulse 3s ease-in-out infinite}.cube-outline .v2{animation:pulse 3s ease-in-out infinite 1.5s}
/* implementation: rollout into classroom cells */
.g1,.g2,.g3,.g4,.g5,.g6{animation:pulse 2.6s ease-in-out infinite}
.g2{animation-delay:.35s}.g3{animation-delay:.7s}.g4{animation-delay:.5s}.g5{animation-delay:.85s}.g6{animation-delay:1.2s}
/* collaboration: two clusters converging */
.m1{animation:drift 5s ease-in-out infinite;transform-box:view-box}
.m2{animation:drift2 6s ease-in-out infinite;transform-box:view-box}
/* funding: ascending bars */
@keyframes grow{0%,100%{transform:scaleY(.32)}50%{transform:scaleY(1)}}
.bar{transform-box:fill-box;transform-origin:bottom;animation:grow 3.2s ease-in-out infinite}
.bar2{animation-delay:.3s}.bar3{animation-delay:.6s}.bar4{animation-delay:.9s}.bar5{animation-delay:1.2s}
/* contact: broadcast beacon */
@keyframes beacon{0%{transform:scale(.2);opacity:.85}70%{opacity:0}100%{transform:scale(1.7);opacity:0}}
.ring{transform-box:view-box;transform-origin:150px 32px;animation:beacon 3s ease-out infinite}
.ring2{animation-delay:1s}.ring3{animation-delay:2s}

/* ============================================================
   SECTION PAGES  (reuse legacy section markup, modern shell)
   ============================================================ */
.page{max-width:1120px;margin:0 auto;width:100%}
.page section{border-bottom:1px solid var(--line);padding:clamp(40px,7vh,84px) clamp(20px,5vw,60px)}
.page section:last-of-type{border-bottom:0}
.backhub{display:inline-flex;align-items:center;gap:8px;margin:6px clamp(20px,5vw,60px) 40px;font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--muted);text-decoration:none}
.backhub:hover{color:var(--crimson-ink)}
/* modern refinement of the legacy card-like components */
.plat,.pub,.cell,.stage,.apparatus,.symmetry,.sym,.dom{border-radius:12px}
.plat:hover{border-color:var(--crimson)}
.plat-try:hover,.plat-try:focus-visible{border-color:var(--crimson);color:var(--crimson-ink)}
footer{border-top:1px solid var(--line);margin-left:0!important}

@media (max-width:900px){
  .hub{height:auto;min-height:100dvh}
  .hub-main{grid-template-columns:1fr;align-items:start;gap:26px}
  .card.feature{flex-direction:column}
  .card.feature .lattice{flex-basis:150px}
  .sitebar .nav{display:none}
}
@media (prefers-reduced-motion:reduce){.motif *{animation:none!important}}