/* PLATO·369 — cosmic geometry temple */
:root{
  --bg:#070b16; --bg2:#0d1326; --ink:#e8ecf8; --dim:#93a0c4;
  --gold:#f5c542; --teal:#37e0c8; --fire:#ff6a3d; --air:#8fd3ff; --water:#4a90ff; --earth:#c98f4e; --cosmos:#c07bff;
  --card:#101832cc; --line:#26335c;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:Georgia,'Times New Roman',serif;overflow-x:hidden;line-height:1.55}
#bg3d{position:fixed;inset:0;width:100%;height:100%;z-index:0;opacity:.55}
.hero,.chapter,footer,#chapnav{position:relative;z-index:1}

/* hero */
.hero{min-height:96vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:2rem}
.hero-eyebrow{letter-spacing:.35em;font-size:.75rem;color:var(--teal);margin-bottom:1rem}
h1{font-size:clamp(3rem,10vw,6.5rem);letter-spacing:.06em;font-weight:400}
h1 .dot{color:var(--dim)}
.g369{color:var(--gold);text-shadow:0 0 30px #f5c54266}
.hero-sub{font-size:clamp(1.1rem,3vw,1.5rem);color:var(--dim);margin:1.2rem 0 1.6rem}
.hero-sub strong{color:var(--gold)}
.hero-keys{display:flex;gap:1rem;justify-content:center;margin-bottom:2rem}
.key{width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.9rem;border:2px solid;animation:pulse 3s infinite}
.k3{color:var(--teal);border-color:var(--teal)}
.k6{color:var(--gold);border-color:var(--gold);animation-delay:1s}
.k9{color:var(--cosmos);border-color:var(--cosmos);animation-delay:2s}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 #fff0}50%{box-shadow:0 0 25px 2px currentColor}}
.hero-hint{font-size:.8rem;color:var(--dim);letter-spacing:.15em}

/* nav */
#chapnav{position:sticky;top:0;display:flex;justify-content:center;gap:.4rem;flex-wrap:wrap;padding:.6rem;background:#070b16ee;backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:10}
#chapnav a{color:var(--dim);text-decoration:none;font-size:.85rem;padding:.35rem .7rem;border-radius:999px;border:1px solid transparent}
#chapnav a:hover{color:var(--gold);border-color:var(--line)}

/* chapters */
.chapter{max-width:1100px;margin:0 auto;padding:5rem 1.2rem 3rem}
.ch-head{text-align:center;margin-bottom:2.5rem}
.ch-num{display:inline-block;font-size:.9rem;color:var(--teal);letter-spacing:.5em;border:1px solid var(--line);border-radius:999px;padding:.3rem .9rem .3rem 1.2rem;margin-bottom:.8rem}
h2{font-size:clamp(1.8rem,5vw,2.8rem);letter-spacing:.08em;margin-bottom:.8rem}
.ch-lead{color:var(--dim);max-width:720px;margin:0 auto;font-size:1.05rem}
.ch-lead strong,.ch-lead em{color:var(--ink)}
h3{letter-spacing:.15em;font-size:1rem;color:var(--teal);margin-bottom:1rem;text-align:center}

.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:1.5rem;backdrop-filter:blur(6px)}
.fine{font-size:.85rem;color:var(--dim);margin-top:.9rem}
.fine strong{color:var(--ink)} .center{text-align:center}
.g369{color:var(--gold)} 
.g369big{font-size:1.9rem;color:var(--gold);letter-spacing:.25em;text-shadow:0 0 20px #f5c54255}
.revelation{text-align:center;margin-top:1rem;color:var(--dim)}
.revelation strong{color:var(--ink)} .revelation em{color:var(--teal)}

/* ch1 triangles */
.tri-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:1.2rem;margin-bottom:1.2rem}
.tri-svg svg{width:100%;height:auto;display:block}
.angle-row{display:flex;gap:.6rem;justify-content:center;margin-top:.6rem}
.chip{padding:.25rem .8rem;border-radius:999px;border:1px solid;font-size:1rem}
.c3{color:var(--teal);border-color:var(--teal)} .c6{color:var(--gold);border-color:var(--gold)} .c9{color:var(--cosmos);border-color:var(--cosmos)}
.assembly-card{text-align:center}
.assembly-row{display:flex;gap:2rem;justify-content:center;flex-wrap:wrap;margin-bottom:1rem}
.asm{max-width:300px}
.asm svg{width:260px;height:auto}
.asm p{font-size:.85rem;color:var(--dim)} .asm p strong{color:var(--gold);font-size:1.1rem}

/* buttons */
.btn{font-family:inherit;background:#16203f;border:1px solid var(--line);color:var(--ink);padding:.65rem 1.2rem;border-radius:12px;font-size:.95rem;cursor:pointer;transition:all .2s}
.btn:hover{border-color:var(--gold);color:var(--gold);transform:translateY(-1px)}
.btn.gold{border-color:var(--gold);color:var(--gold)}
.btn-row{display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap;margin-top:1.2rem}
.btn-col{display:flex;flex-direction:column;gap:.6rem}

/* ch2 solids */
.solids-wrap{display:grid;grid-template-columns:150px 1fr 260px;gap:1rem;align-items:stretch}
@media(max-width:840px){.solids-wrap{grid-template-columns:1fr}}
.solid-btns{display:flex;flex-direction:column;gap:.5rem}
@media(max-width:840px){.solid-btns{flex-direction:row;flex-wrap:wrap;justify-content:center}}
.sbtn{font-family:inherit;background:#111a36;border:1px solid var(--line);color:var(--dim);border-radius:12px;padding:.7rem .6rem;cursor:pointer;font-size:.9rem;text-align:left;transition:all .2s}
.sbtn .em{font-size:1.2rem;margin-right:.4rem}
.sbtn.active,.sbtn:hover{color:var(--ink);border-color:var(--sc,#fff);box-shadow:0 0 18px -6px var(--sc,#fff)}
.solid-stage{position:relative;min-height:420px;padding:0;overflow:hidden}
#solids3d{width:100%;height:420px;display:block;cursor:grab;touch-action:none}
.toggle{position:absolute;bottom:.7rem;left:50%;transform:translateX(-50%);font-size:.8rem;color:var(--dim);background:#070b16cc;padding:.3rem .8rem;border-radius:999px;white-space:nowrap}
.solid-stats{font-size:.95rem}
.stat-row{display:flex;justify-content:space-between;border-bottom:1px dashed var(--line);padding:.45rem 0}
.stat-row .v{color:var(--gold)}
.stat-big{text-align:center;margin:1rem 0 .4rem;font-size:2.4rem;color:var(--gold);text-shadow:0 0 24px #f5c54244}
.stat-cap{text-align:center;font-size:.8rem;color:var(--dim)}
.stat-root{text-align:center;margin-top:.8rem;font-size:1rem}
.stat-root b{color:var(--teal);font-size:1.4rem}

/* ch3 alchemy */
.alchemy-card{text-align:center}
.eq-row{display:flex;gap:1rem;justify-content:center;align-items:center;flex-wrap:wrap;margin-bottom:1.2rem}
.eq-side{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;justify-content:center}
.eq-glyph{font-size:2rem}
.eq-label{letter-spacing:.1em;font-size:.9rem}
.eq-count{color:var(--gold);font-size:1rem}
.eq-arrow{font-size:2rem;color:var(--teal)}
.eq-plus{color:var(--dim);font-size:1.4rem}
.tri-pool{display:grid;grid-template-columns:repeat(20,1fr);gap:3px;max-width:640px;margin:0 auto;padding:.6rem}
@media(max-width:640px){.tri-pool{grid-template-columns:repeat(12,1fr)}}
.tri{width:100%;aspect-ratio:1;clip-path:polygon(50% 0,100% 100%,0 100%);background:var(--water);transition:background .9s, transform .9s}
.tri.air{background:var(--air)} .tri.fire{background:var(--fire)} .tri.flip{transform:rotate(180deg)}

/* ch4 soul */
.soul-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.2rem}
#lambda-svg{width:100%;height:auto}
.lam-node{cursor:pointer}
.lam-node circle{fill:#111a36;stroke:var(--line);stroke-width:1.5;transition:all .2s}
.lam-node:hover circle{stroke:var(--gold)}
.lam-node.p3 circle{stroke:var(--gold)}
.lam-node text{fill:var(--ink);font-size:20px;text-anchor:middle;dominant-baseline:central;font-family:Georgia,serif}
.lam-edge{stroke:var(--line);stroke-width:2}
.chi-stage{height:230px}
#chi3d{width:100%;height:100%;display:block}

/* ch5 code */
.code-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin-bottom:1.2rem}
.code-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:1.2rem;text-align:center}
.code-card .em{font-size:2rem}
.code-card h4{letter-spacing:.15em;font-weight:400;color:var(--dim);font-size:.85rem;margin:.4rem 0}
.code-math{font-size:1.05rem;margin:.5rem 0;color:var(--ink)}
.code-root{font-size:2.2rem;margin-top:.3rem}
.r3{color:var(--teal)} .r6{color:var(--gold)} .r9{color:var(--cosmos)}
.total-card{text-align:center}
.total-eq{font-size:1.5rem;margin:.6rem 0}
.big-gold{font-size:2.6rem;color:var(--gold);text-shadow:0 0 24px #f5c54255}
.total-sub{color:var(--dim);margin:.5rem 0;font-size:1rem}
.total-sub strong{color:var(--ink)}

/* ch6 path */
.path-wrap{display:flex;flex-direction:column;gap:.9rem;max-width:760px;margin:0 auto 1.4rem}
.pstep{display:flex;gap:1rem;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:1.1rem 1.3rem}
.pstep .n{flex:0 0 auto;width:44px;height:44px;border-radius:50%;border:2px solid var(--teal);color:var(--teal);display:flex;align-items:center;justify-content:center;font-size:1.2rem}
.pstep h4{font-weight:400;letter-spacing:.08em;margin-bottom:.25rem}
.pstep p{font-size:.9rem;color:var(--dim)}
.pstep p strong{color:var(--ink)}

/* ch7 earth */
.earth-wrap{display:grid;grid-template-columns:1fr 300px;gap:1rem}
@media(max-width:900px){.earth-wrap{grid-template-columns:1fr}}
.earth-stage{position:relative;padding:0;overflow:hidden;min-height:520px}
#earth3d{width:100%;height:460px;display:block;cursor:grab;touch-action:none}
.earth-legend{display:flex;flex-wrap:wrap;gap:.5rem .9rem;justify-content:center;padding:.4rem .8rem;font-size:.72rem;color:var(--dim)}
.earth-legend i{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:.3rem;vertical-align:middle}
.earth-btns{padding-bottom:1rem;margin-top:.4rem}
.glabel{position:absolute;transform:translate(-50%,-140%);font-size:.68rem;letter-spacing:.06em;color:var(--ink);background:#070b16d9;border:1px solid var(--line);border-radius:999px;padding:.15rem .55rem;pointer-events:none;white-space:nowrap;z-index:3}
.lab-den{color:#ff3b6b;border-color:#ff3b6b}
.lab-gold{color:var(--gold);border-color:var(--gold)}
.lab-node{color:var(--dim)}
.earth-stats h3{font-size:.85rem}

.field-file{margin-top:1.2rem}
.ff-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:.9rem}
.ff{border:1px solid var(--line);border-radius:14px;padding:1rem}
.ff h4{letter-spacing:.12em;font-weight:400;color:var(--teal);font-size:.82rem;margin-bottom:.5rem}
.ff p{font-size:.85rem;color:var(--dim)}
.ff p strong{color:var(--ink)} .ff p em{color:var(--gold);font-style:normal}
.ff-lore{grid-column:1/-1;border-color:var(--gold);background:#f5c54208}
.ff-lore h4{color:var(--gold)}
.lore-tag{font-size:.62rem;color:var(--dim);letter-spacing:.08em;border:1px dashed var(--line);border-radius:999px;padding:.1rem .5rem;margin-left:.4rem}

/* ch8 atoms */
.states-card{margin-bottom:1.2rem}
.states-row{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap}
.state{display:flex;flex-direction:column;align-items:center;gap:.15rem;border:1px solid var(--line);border-radius:14px;padding:.8rem 1.4rem;letter-spacing:.12em;font-size:.8rem;color:var(--dim)}
.state span{font-size:1.8rem}
.state b{color:var(--gold);letter-spacing:.18em}
.ptable-card{margin-bottom:1.2rem;text-align:center}
.ptable-scroll{overflow-x:auto;padding-bottom:.5rem}
.ptable{display:grid;grid-template-columns:repeat(18,minmax(30px,1fr));grid-auto-rows:auto;gap:3px;min-width:640px;margin:0 auto}
.pcell{position:relative;border-radius:5px;padding:.42rem .1rem .3rem;text-align:center;border:1px solid #1d2850;transition:all .35s}
.pcell .z{position:absolute;top:1px;left:3px;font-size:.5rem;color:var(--dim)}
.pcell .sy{font-size:.72rem}
.pcell .droot{display:none;font-size:.62rem;color:var(--dim)}
.b-s{background:#12324233}.b-p{background:#4a3a1233}.b-d{background:#14224a33}.b-f{background:#33174a33}
.ptable > .pcell[style*="grid-row:9"], .ptable > .pcell[style*="grid-row:10"]{margin-top:0}
.ptable > .pcell[style*="grid-row:9"]{transform:translateY(8px)}
.ptable > .pcell[style*="grid-row:10"]{transform:translateY(8px)}
.show-dr .pcell .droot{display:block}
.show-dr .pcell.d3{background:#0c4b42;border-color:var(--teal)}
.show-dr .pcell.d3 .droot{color:var(--teal)}
.show-dr .pcell.d6{background:#4b3c0c;border-color:var(--gold)}
.show-dr .pcell.d6 .droot{color:var(--gold)}
.show-dr .pcell.d9{background:#3a1358;border-color:var(--cosmos)}
.show-dr .pcell.d9 .droot{color:var(--cosmos)}
.show-dr .pcell.noble9{box-shadow:0 0 14px 2px #c07bff88;z-index:2}
.octave-card{margin-bottom:1.2rem;text-align:center}
.octave-strip{display:flex;flex-direction:column;gap:.4rem;align-items:center;margin:.8rem 0}
.oct-row{display:flex;gap:.4rem}
.okey{width:52px;padding:.6rem 0;border:1px solid var(--line);border-radius:9px;background:#111a36;font-size:.9rem;transition:all .25s}
.okey.ghost{visibility:hidden}
.okey.odots{color:var(--dim);border-style:dashed}
.okey.samecol{border-color:var(--teal);color:var(--teal);box-shadow:0 0 12px -3px var(--teal)}
.okey.playing{background:var(--gold);color:#070b16;border-color:var(--gold);transform:translateY(-4px)}
@media(max-width:480px){.okey{width:40px;font-size:.75rem}}
.mol-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:.9rem}
.mol{border:1px solid var(--line);border-radius:14px;padding:1rem;text-align:center}
.mol .em{font-size:1.7rem}
.mol h4{letter-spacing:.15em;font-weight:400;color:var(--teal);font-size:.8rem;margin:.4rem 0}
.mol p{font-size:.78rem;color:var(--dim)}

footer{text-align:center;padding:3rem 1rem 4rem;color:var(--dim);border-top:1px solid var(--line);margin-top:3rem}

/* ch8 — THE DRIFT (mod-9 walk across chemical families) */
.drift-card{margin-bottom:1.2rem}
.drift-legend{display:flex;gap:.5rem;flex-wrap:wrap;justify-content:center;margin:.9rem 0 .2rem}
.dstep{font-size:.72rem;color:var(--dim);border:1px solid var(--line);border-radius:999px;padding:.28rem .7rem}
.dstep b{font-family:'Courier New',monospace}
.dstep.s8{border-color:#4a90ff66}.dstep.s8 b{color:var(--water)}
.dstep.s18{border-color:#f5c54288}.dstep.s18 b{color:var(--gold)}
.dstep.s32{border-color:#ff6a3d66}.dstep.s32 b{color:var(--fire)}
#drift-groups .btn{padding:.42rem .8rem;font-size:.82rem}
#drift-groups .btn.on{border-color:var(--teal);color:var(--teal);background:#0c2b2a}
.drift-scroll{overflow-x:auto;padding:.4rem 0 .6rem}
.drift-walk{display:flex;align-items:stretch;justify-content:center;gap:0;min-height:112px;padding:1rem .2rem .4rem}
.dchip{min-width:66px;border:1px solid var(--line);border-radius:12px;padding:.5rem .35rem .45rem;text-align:center;background:#0d142b;flex:0 0 auto;animation:dpop .45s both}
.dchip .dz{font-size:.56rem;color:var(--dim);font-family:'Courier New',monospace}
.dchip .dsy{font-size:1.05rem;display:block;margin:.1rem 0 .15rem}
.dchip .dr{font-size:1.5rem;font-family:'Courier New',monospace;color:var(--dim);line-height:1}
.dchip .dper{font-size:.5rem;color:#5e6c92;letter-spacing:.06em;display:block;margin-top:.2rem}
.dchip.t3{border-color:var(--teal);box-shadow:0 0 12px #37e0c833}.dchip.t3 .dr{color:var(--teal)}
.dchip.t6{border-color:var(--gold);box-shadow:0 0 12px #f5c54233}.dchip.t6 .dr{color:var(--gold)}
.dchip.t9{border-color:var(--cosmos);box-shadow:0 0 12px #c07bff44}.dchip.t9 .dr{color:var(--cosmos)}
.darrow{flex:0 0 auto;align-self:center;text-align:center;padding:0 .3rem;animation:dpop .45s both}
.darrow .dlen{font-size:.56rem;color:var(--dim);font-family:'Courier New',monospace;display:block}
.darrow .dline{font-size:1rem;color:var(--line)}
.darrow .dmod{font-size:.66rem;font-family:'Courier New',monospace;display:block;margin-top:.1rem}
.darrow.a8 .dmod{color:var(--water)}.darrow.a8 .dline{color:#4a90ff88}
.darrow.a18 .dmod{color:var(--gold)}.darrow.a18 .dline{color:#f5c542aa}
.darrow.a32 .dmod{color:var(--fire)}.darrow.a32 .dline{color:#ff6a3d88}
@keyframes dpop{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.drift-locks{margin-top:1.2rem;border-top:1px solid var(--line);padding-top:1rem}
.drift-locks h4{font-weight:400;letter-spacing:.1em;font-size:.84rem;color:var(--teal);margin-bottom:.5rem}
.lockgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:.6rem}
.lockcell{border:1px solid var(--line);border-radius:12px;padding:.6rem .7rem;background:#0d142baa}
.lockcell .lv{font-family:'Courier New',monospace;font-size:1.6rem;float:right;line-height:1}
.lockcell .lsy{font-size:.95rem}
.lockcell .lfine{font-size:.66rem;color:var(--dim);display:block;margin-top:.2rem}
.lockcell.t3{border-color:#37e0c866}.lockcell.t3 .lv{color:var(--teal)}
.lockcell.t6{border-color:#f5c54266}.lockcell.t6 .lv{color:var(--gold)}
.lockcell.t9{border-color:#c07bff66}.lockcell.t9 .lv{color:var(--cosmos)}
@media(max-width:560px){.dchip{min-width:58px}.dchip .dr{font-size:1.25rem}.drift-walk{justify-content:flex-start}}