/* The Trait Atlas — ZET-LEARN-025 open-book two-page spread.
   Leather-bound field atlas, #FAF9F5 paper, spine shadow,
   left page narrative / right page brass instrument. */

:root{
  --paper:#FAF9F5;
  --paper-edge:#efe9dc;
  --ink:#3a3226;
  --ink-soft:rgba(58,50,38,.66);
  --ink-faint:rgba(58,50,38,.42);
  --leather-hi:#5a4228;
  --leather:#3d2c1c;
  --leather-lo:#241a10;
  --tooling:#8a6b3f;
  --brass-lo:#8a6d3b;
  --brass:#c9a35c;
  --brass-hi:#f0d9a8;
  --brass-ink:#43330f;
  --wax:#a33b2e;
  --err:#a33b2e;
  --ok:#4c6b3f;
  --w-sage:#7d9b76;
  --w-ochre:#c98f3a;
  --w-slate:#7a94a8;
  --w-terra:#b56a4e;
  --w-plum:#8f7a9e;
  --accent:#d9a441;
  --accent-ink:#2a2110;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");
}

*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  font-family:var(--serif);
  color:var(--ink);
  background:
    radial-gradient(120% 90% at 50% 0%,var(--leather-hi) 0%,var(--leather) 46%,var(--leather-lo) 100%);
  overflow:hidden;
  -webkit-font-smoothing:antialiased;
}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}

.room{
  position:fixed;inset:0;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:14px;padding:14px;
}

/* ---------- the book ---------- */
.book{
  position:relative;
  width:min(1180px,96vw);
  height:min(760px,86vh);
  display:grid;
  grid-template-columns:1fr 46px 1fr;
  border-radius:10px;
  padding:14px;
  background:
    linear-gradient(135deg,#54402a,#3a2b1a 40%,#2c2013 60%,#4a3722);
  box-shadow:
    0 30px 60px -18px rgba(0,0,0,.65),
    0 8px 18px rgba(0,0,0,.4),
    inset 0 0 0 2px rgba(138,107,63,.55),
    inset 0 0 22px rgba(0,0,0,.55);
}
.book::before{ /* tooled inner frame */
  content:"";position:absolute;inset:7px;border-radius:6px;
  border:1.5px solid rgba(190,152,92,.5);
  box-shadow:inset 0 0 0 3px rgba(36,26,16,.6);
  pointer-events:none;z-index:5;
}
.page{
  position:relative;overflow:hidden;
  background:var(--paper);
  display:flex;flex-direction:column;
}
.page-left{border-radius:5px 1px 1px 5px;box-shadow:inset -26px 0 34px -22px rgba(58,42,20,.5)}
.page-right{border-radius:1px 5px 5px 1px;box-shadow:inset 26px 0 34px -22px rgba(58,42,20,.5)}
.page::after{ /* paper grain */
  content:"";position:absolute;inset:0;background-image:var(--grain);
  opacity:.055;mix-blend-mode:multiply;pointer-events:none;z-index:1;
}
.spine{
  position:relative;z-index:2;
  background:
    linear-gradient(90deg,rgba(30,20,10,.55),rgba(250,246,235,.14) 18%,rgba(30,20,10,.28) 50%,rgba(250,246,235,.14) 82%,rgba(30,20,10,.55)),
    linear-gradient(180deg,#efe7d6,#e6dcc4 50%,#efe7d6);
  box-shadow:inset 0 0 14px rgba(30,20,10,.5);
  display:flex;flex-direction:column;justify-content:space-evenly;align-items:center;
  padding:18px 0;
}
.spine i{
  width:16px;height:5px;border-radius:3px;
  background:linear-gradient(180deg,#8a6b3f,#5d4525);
  box-shadow:0 1px 0 rgba(255,255,255,.25),inset 0 1px 1px rgba(0,0,0,.4);
}

/* watercolor washes live inside pages */
.wash{position:absolute;pointer-events:none;mix-blend-mode:multiply;filter:blur(1px);opacity:.5;z-index:0}

/* ---------- page flip sheet (desktop) ---------- */
.flip-sheet{
  position:absolute;top:14px;bottom:14px;left:calc(50% + 9px);width:calc(50% - 23px);
  transform-origin:left center;transform-style:preserve-3d;
  perspective:1200px;z-index:4;display:none;pointer-events:none;
}
.flip-sheet.on{display:block}
.flip-face{
  position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  background:var(--paper);overflow:hidden;
  box-shadow:6px 0 18px -8px rgba(30,20,10,.45);
}
.flip-front{border-radius:1px 5px 5px 1px}
.flip-back{transform:rotateY(180deg);border-radius:5px 1px 1px 5px;box-shadow:-6px 0 18px -8px rgba(30,20,10,.45)}
.flip-face::after{content:"";position:absolute;inset:0;background-image:var(--grain);opacity:.05;mix-blend-mode:multiply;pointer-events:none}
.book.flipping .flip-sheet{animation:pageFlip .62s cubic-bezier(.3,.7,.35,1) forwards}
.book.flipping-back .flip-sheet{animation:pageFlipBack .62s cubic-bezier(.3,.7,.35,1) forwards}
@keyframes pageFlip{from{transform:rotateY(0)}to{transform:rotateY(-180deg)}}
@keyframes pageFlipBack{from{transform:rotateY(-180deg)}to{transform:rotateY(0)}}
.book.fold .flip-sheet{left:14px;right:14px;top:calc(42%);width:auto;bottom:14px;transform-origin:center top}

/* ---------- narrative (left page) ---------- */
.leaf{padding:30px 34px 32px;height:100%;display:flex;flex-direction:column;position:relative;z-index:2}
.leaf>*{flex-shrink:0}
.folio{position:absolute;bottom:12px;font-size:12px;color:var(--ink-faint);letter-spacing:.08em;font-variant-numeric:oldstyle-nums}
.page-left .folio{left:16px}
.page-right .folio{right:16px}
.kicker{font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:10px}
.q{
  font-size:clamp(20px,2.2vw,27px);line-height:1.22;font-weight:600;
  color:var(--ink);margin-bottom:14px;letter-spacing:.005em;
}
.a{font-size:clamp(14px,1.35vw,16.5px);line-height:1.62;color:var(--ink-soft);max-width:42ch}
.a+.a{margin-top:.75em}
.a b,.a strong{color:var(--ink);font-weight:600}
.a code,.q code{
  font-family:var(--mono);font-size:.86em;background:rgba(58,50,38,.08);
  border-radius:4px;padding:.08em .34em;color:#5b4a2f;white-space:nowrap;
}
.margin-note{
  margin-top:auto;margin-bottom:14px;padding-top:14px;font-size:12.5px;line-height:1.5;
  color:var(--ink-faint);font-style:italic;max-width:38ch;
}

/* engraved code plaque */
.plaque{
  position:relative;margin-top:16px;align-self:flex-start;max-width:100%;
  font-family:var(--mono);font-size:clamp(12px,1.05vw,13.5px);line-height:1.65;
  color:var(--brass-ink);
  background:linear-gradient(135deg,#96763f,#d9b877 28%,#f4e2b0 50%,#cda55e 72%,#8a6d3b);
  border-radius:9px;padding:13px 16px;
  box-shadow:
    inset 0 1px 0 rgba(255,246,220,.75),inset 0 -2px 4px rgba(70,50,15,.45),
    0 3px 8px rgba(50,35,12,.35);
  text-shadow:0 1px 0 rgba(255,244,214,.5);
  white-space:pre;overflow-x:auto;
}
.plaque::before{ /* rivets */
  content:"";position:absolute;inset:5px;border-radius:6px;pointer-events:none;
  background:
    radial-gradient(circle 3.2px at 8px 8px,#6b4e22 40%,#f4e2b0 55%,transparent 70%),
    radial-gradient(circle 3.2px at calc(100% - 8px) 8px,#6b4e22 40%,#f4e2b0 55%,transparent 70%),
    radial-gradient(circle 3.2px at 8px calc(100% - 8px),#6b4e22 40%,#f4e2b0 55%,transparent 70%),
    radial-gradient(circle 3.2px at calc(100% - 8px) calc(100% - 8px),#6b4e22 40%,#f4e2b0 55%,transparent 70%);
}
.plaque .kw{color:#6b3a12;font-weight:600}
.plaque .ty{color:#274d63}
.plaque .fn{color:#14406b}
.plaque .st{color:#4c5a22}
.plaque .cm{color:rgba(67,51,15,.6);font-style:italic}
.plaque.ink{
  background:linear-gradient(135deg,#efe9dc,#e4dbc6);
  color:#574a33;text-shadow:0 1px 0 rgba(255,255,255,.5);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.7),inset 0 -2px 4px rgba(90,75,45,.25),0 2px 6px rgba(50,35,12,.2);
}
.plaque.ink::before{background:none}

/* ---------- instrument (right page) ---------- */
.bench{padding:22px 24px 26px;height:100%;display:flex;flex-direction:column;position:relative;z-index:2}
.bench-title{
  text-align:center;font-size:12px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--ink-faint);margin-bottom:12px;
}
.stage{flex:1;position:relative;min-height:0}
.hint{
  position:relative;margin-top:9px;text-align:center;
  font-size:12.5px;font-style:italic;color:var(--ink-soft);
  transition:opacity .4s;min-height:1.2em;
}
.hint.gone{opacity:0}

/* brass machine base */
.machine{
  position:absolute;inset:0;border-radius:12px;
  background:
    radial-gradient(120% 100% at 50% 0%,rgba(255,244,214,.35),transparent 55%),
    linear-gradient(160deg,#a5824a,#c9a35c 30%,#e8cd94 48%,#b98f4e 66%,#7d6132);
  box-shadow:
    inset 0 2px 0 rgba(255,246,220,.5),inset 0 -3px 8px rgba(60,42,12,.5),
    inset 0 0 0 2px rgba(90,66,26,.6),0 10px 24px -8px rgba(50,35,12,.45);
}
.machine::before{ /* patina speckle */
  content:"";position:absolute;inset:0;border-radius:12px;opacity:.16;mix-blend-mode:multiply;
  background-image:var(--grain);
}
.machine .engrave-frame{position:absolute;inset:16px;border-radius:7px;border:1.5px solid rgba(90,66,26,.4);box-shadow:inset 0 1px 0 rgba(255,244,214,.35);pointer-events:none}
.machine::after{ /* corner rivets */
  content:"";position:absolute;inset:7px;border-radius:8px;pointer-events:none;
  background:
    radial-gradient(circle 3.5px at 9px 9px,#5d451f 40%,#f4e2b0 58%,transparent 72%),
    radial-gradient(circle 3.5px at calc(100% - 9px) 9px,#5d451f 40%,#f4e2b0 58%,transparent 72%),
    radial-gradient(circle 3.5px at 9px calc(100% - 9px),#5d451f 40%,#f4e2b0 58%,transparent 72%),
    radial-gradient(circle 3.5px at calc(100% - 9px) calc(100% - 9px),#5d451f 40%,#f4e2b0 58%,transparent 72%);
}
.plate-label{
  position:absolute;top:9px;left:50%;transform:translateX(-50%);
  font-size:13.5px;font-style:italic;letter-spacing:.02em;
  color:var(--brass-ink);text-shadow:0 1px 0 rgba(255,244,214,.55);white-space:nowrap;
}

/* ---------- tokens: brass medallions ---------- */
.token{
  position:absolute;width:84px;height:84px;border-radius:50%;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  background:radial-gradient(circle at 32% 28%,#f0d9a8,#c9a35c 46%,#8a6d3b 88%);
  box-shadow:
    inset 0 2px 3px rgba(255,246,220,.7),inset 0 -4px 7px rgba(70,50,15,.55),
    0 5px 10px rgba(45,32,10,.4);
  border:2px solid rgba(90,66,26,.75);
  color:var(--brass-ink);text-align:center;
  transition:transform .18s cubic-bezier(.3,1.6,.5,1),box-shadow .18s;
  touch-action:manipulation;user-select:none;
}
.token:hover{transform:translateY(-2px)}
.token:active{transform:translateY(1px) scale(.96)}
.token .glyph{width:34px;height:34px}
.token .tname{font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.02em;text-shadow:0 1px 0 rgba(255,244,214,.5)}
.token .ribbon{
  position:absolute;bottom:-9px;left:50%;transform:translateX(-50%);
  font-family:var(--mono);font-size:10px;padding:1px 7px;border-radius:8px;white-space:nowrap;
  background:linear-gradient(180deg,#5d7a54,#47663f);color:#f2eedd;
  box-shadow:0 2px 4px rgba(40,30,10,.4);opacity:0;transition:opacity .3s;
}
.token.signed .ribbon{opacity:1}
.token.dim{filter:saturate(.35) brightness(.94)}
.token.pulse{animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{
  0%,100%{box-shadow:inset 0 2px 3px rgba(255,246,220,.7),inset 0 -4px 7px rgba(70,50,15,.55),0 5px 10px rgba(45,32,10,.4)}
  50%{box-shadow:inset 0 2px 3px rgba(255,246,220,.7),inset 0 -4px 7px rgba(70,50,15,.55),0 5px 14px rgba(45,32,10,.4),0 0 0 7px rgba(201,143,58,.28)}
}
.token.reject{animation:rattle .45s}
@keyframes rattle{
  0%,100%{transform:translateX(0)}20%{transform:translateX(-6px) rotate(-3deg)}
  40%{transform:translateX(5px) rotate(2deg)}60%{transform:translateX(-4px)}80%{transform:translateX(3px)}
}

/* vellum slips that print out */
.slip{
  position:absolute;font-family:var(--mono);font-size:11.5px;line-height:1.5;
  background:linear-gradient(180deg,#fbf7ea,#f1e9d4);
  color:#4a3d28;border:1px solid rgba(120,95,50,.35);border-radius:3px;
  padding:7px 10px;white-space:pre;box-shadow:0 3px 7px rgba(50,35,12,.28);
  transform-origin:top center;
}
.slip.print{animation:slipIn .55s cubic-bezier(.25,1.2,.4,1) both}
@keyframes slipIn{from{transform:translateY(-14px) scaleY(.2);opacity:0}to{transform:none;opacity:1}}
.slip.err{
  background:linear-gradient(180deg,#f8ece7,#f0dcd3);color:var(--err);
  border-color:rgba(163,59,46,.45);
}
.chip{animation:chipIn .45s cubic-bezier(.3,1.4,.5,1) both}
@keyframes chipIn{from{transform:translateY(-16px) scale(.4);opacity:0}to{opacity:1}}
.slip.stamp-ok::after{
  content:"✓";position:absolute;right:-10px;top:-12px;width:26px;height:26px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:15px;color:#f2eedd;
  background:radial-gradient(circle at 35% 30%,#5d7a54,#3f5a37);box-shadow:0 2px 5px rgba(40,30,10,.45);
  transform:rotate(-12deg);font-family:var(--serif);
}

/* counter dial */
.dial{
  position:absolute;display:flex;flex-direction:column;align-items:center;gap:2px;
  font-family:var(--mono);
}
.dial .win{
  min-width:44px;text-align:center;font-size:20px;font-weight:700;color:var(--brass-ink);
  background:linear-gradient(180deg,#efe3c2,#d9c391);border-radius:6px;padding:2px 10px;
  box-shadow:inset 0 2px 4px rgba(70,50,15,.5),0 1px 0 rgba(255,244,214,.5);
  text-shadow:0 1px 0 rgba(255,244,214,.6);font-variant-numeric:tabular-nums;
}
.dial .cap{font-size:10.5px;letter-spacing:.03em;color:var(--brass-ink);text-shadow:0 1px 0 rgba(255,244,214,.5)}
.dial .win.flip{animation:dialFlip .4s}
@keyframes dialFlip{0%{transform:rotateX(0)}45%{transform:rotateX(-88deg)}100%{transform:rotateX(0)}}

/* small brass buttons inside instruments */
.b-btn{
  position:absolute;font-family:var(--mono);font-size:12px;font-weight:600;color:var(--brass-ink);
  background:linear-gradient(180deg,#e8cd94,#c9a35c 60%,#a5824a);
  border:1.5px solid rgba(90,66,26,.8);border-radius:9px;padding:7px 13px;
  box-shadow:0 3px 0 #6b5226,0 6px 10px rgba(45,32,10,.35),inset 0 1px 0 rgba(255,246,220,.7);
  text-shadow:0 1px 0 rgba(255,244,214,.5);
  transition:transform .12s,box-shadow .12s;touch-action:manipulation;white-space:nowrap;
}
.b-btn:active{transform:translateY(3px);box-shadow:0 0 0 #6b5226,0 2px 5px rgba(45,32,10,.3),inset 0 1px 0 rgba(255,246,220,.7)}
.b-btn:disabled{opacity:.45;pointer-events:none}

/* wax seal */
.seal{
  position:absolute;width:44px;height:44px;border-radius:47% 53% 50% 50%/52% 48% 52% 48%;
  background:radial-gradient(circle at 36% 30%,#c05a48,#a33b2e 55%,#7c2a20);
  box-shadow:inset 0 -3px 6px rgba(60,10,5,.5),0 3px 7px rgba(50,20,10,.4);
  display:flex;align-items:center;justify-content:center;
  color:#f6e3d6;font-family:var(--serif);font-size:19px;font-style:italic;
  transform:rotate(-8deg) scale(0);
}
.seal.in{animation:sealIn .5s cubic-bezier(.3,1.8,.45,1) forwards}
@keyframes sealIn{from{transform:rotate(-8deg) scale(0)}to{transform:rotate(-8deg) scale(1)}}

/* gate of bounds */
.gate-arch{position:absolute;left:50%;top:14%;transform:translateX(-50%);width:210px;height:150px}
.lever{
  position:absolute;width:34px;height:74px;border-radius:9px;
  background:linear-gradient(90deg,#8a6d3b,#d9b877 45%,#96763f);
  box-shadow:inset 0 0 0 2px rgba(90,66,26,.7),0 4px 8px rgba(45,32,10,.4);
  transition:transform .35s cubic-bezier(.3,1.4,.5,1);
}
.lever .knob{
  position:absolute;left:50%;top:5px;transform:translateX(-50%);
  width:24px;height:24px;border-radius:50%;
  background:radial-gradient(circle at 35% 30%,#f0d9a8,#b98f4e 70%);
  box-shadow:0 2px 4px rgba(45,32,10,.5);
}
.lever.down{transform:rotate(24deg)}

/* speech puffs */
.puff{
  position:absolute;font-family:var(--serif);font-style:italic;font-size:14px;color:var(--ink);
  background:#fffdf6;border:1.5px solid rgba(90,66,26,.5);border-radius:14px 14px 14px 3px;
  padding:4px 11px;box-shadow:0 3px 7px rgba(50,35,12,.25);white-space:nowrap;
  animation:puffIn .45s cubic-bezier(.3,1.5,.45,1) both;
}
@keyframes puffIn{from{transform:translateY(8px) scale(.6);opacity:0}to{transform:none;opacity:1}}

/* page block edges */
.page-right .leaf,.page-right .bench{position:relative}
.page-right::before,.page-left::before{
  content:"";position:absolute;top:8px;bottom:8px;width:5px;z-index:0;
  background:repeating-linear-gradient(180deg,#eae4d3 0 2px,#d9d1bc 2px 3px);opacity:.9;
}
.page-right::before{right:0;border-radius:0 3px 3px 0}
.page-left::before{left:0;border-radius:3px 0 0 3px}

/* spot illustration on the narrative page */
.spot{margin-top:14px;align-self:center;opacity:.92}
.spot svg{display:block;width:min(62%,280px);height:auto}

@media (min-width:900px){
  .q{font-size:28px}
  .a{font-size:17px;max-width:46ch}
  .margin-note{font-size:13px}
}

/* ---------- cover ---------- */
.cover{
  position:absolute;inset:14px;z-index:6;border-radius:8px;overflow:hidden;
  background:
    radial-gradient(100% 80% at 50% 18%,rgba(190,152,92,.28),transparent 60%),
    linear-gradient(150deg,#4f3a24,#332514 45%,#241a0e 65%,#43301d);
  box-shadow:inset 0 0 0 2px rgba(138,107,63,.6),inset 0 0 60px rgba(0,0,0,.5);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0;
  cursor:pointer;transform-origin:left center;
}
.cover::before{content:"";position:absolute;inset:10px;border:1.5px solid rgba(190,152,92,.45);border-radius:5px;box-shadow:inset 0 0 0 4px rgba(30,20,10,.5);pointer-events:none}
.cover::after{content:"";position:absolute;inset:0;background-image:var(--grain);opacity:.08;mix-blend-mode:multiply;pointer-events:none}
.cover.open{animation:coverOpen .8s cubic-bezier(.4,.7,.3,1) forwards}
@keyframes coverOpen{to{transform:rotateY(-160deg);opacity:0;visibility:hidden}}
.cover .cartouche{width:min(64%,340px);margin-bottom:18px}
.cover .c-title{
  font-size:clamp(26px,4.4vw,44px);letter-spacing:.14em;color:#e8d5ab;text-align:center;
  text-shadow:0 2px 0 rgba(20,12,4,.7),0 0 22px rgba(217,164,65,.25);font-weight:600;
}
.cover .c-sub{
  margin-top:10px;text-align:center;font-family:var(--mono);font-size:clamp(12px,1.4vw,14px);
  letter-spacing:.06em;color:rgba(232,213,171,.72);
}
.clasp{
  margin-top:34px;width:104px;height:40px;border-radius:10px;position:relative;
  background:linear-gradient(180deg,#e8cd94,#b98f4e 60%,#8a6d3b);
  box-shadow:0 4px 0 #5d451f,0 9px 16px rgba(0,0,0,.5),inset 0 1px 0 rgba(255,246,220,.8);
  display:flex;align-items:center;justify-content:center;
  color:var(--brass-ink);font-family:var(--mono);font-size:12px;letter-spacing:.2em;
  text-shadow:0 1px 0 rgba(255,244,214,.6);animation:claspGlow 2.2s ease-in-out infinite;
}
@keyframes claspGlow{0%,100%{filter:brightness(1)}50%{filter:brightness(1.14)}}
.cover.open .clasp{animation:none}

/* ---------- the rail (nav) ---------- */
.rail{
  display:flex;align-items:center;gap:18px;
  padding:9px 14px;border-radius:14px;
  background:linear-gradient(160deg,#4a3722,#33251a 55%,#2a1e12);
  box-shadow:inset 0 0 0 1.5px rgba(138,107,63,.55),0 10px 22px rgba(0,0,0,.45);
}
.rail-btn{
  border-radius:11px;padding:10px 18px;font-size:15px;touch-action:manipulation;
  transition:transform .12s cubic-bezier(.3,1.6,.5,1),box-shadow .12s,filter .15s;
  user-select:none;
}
.rail-btn:active{transform:scale(.94)}
.rail-next{
  font-family:var(--mono);font-weight:700;letter-spacing:.04em;color:var(--accent-ink);
  background:linear-gradient(180deg,#f0c25e,#d9a441 55%,#b9872e);
  box-shadow:0 4px 0 #7c5a1a,0 8px 14px rgba(0,0,0,.4),inset 0 1px 0 rgba(255,246,220,.8);
}
.rail-next:active{transform:translateY(3px);box-shadow:0 1px 0 #7c5a1a,0 3px 8px rgba(0,0,0,.35),inset 0 1px 0 rgba(255,246,220,.8)}
.rail-prev{
  color:rgba(232,213,171,.85);font-size:18px;padding:10px 14px;
  box-shadow:inset 0 0 0 1.5px rgba(190,152,92,.4);
}
.rail-prev:disabled{opacity:.3;pointer-events:none}
.rail-mid{display:flex;flex-direction:column;align-items:center;gap:5px;min-width:96px}
.rail-counter{font-family:var(--mono);font-size:12px;letter-spacing:.18em;color:rgba(232,213,171,.75);white-space:nowrap}
.rail-dots{display:flex;gap:6px}
.rail-dots i{width:6px;height:6px;border-radius:50%;background:rgba(190,152,92,.35);transition:all .3s}
.rail-dots i.on{background:var(--accent);transform:scale(1.25)}

/* sound orb (sits at the left end of the rail) */
.sound-orb{
  flex:0 0 auto;width:34px;height:34px;border-radius:50%;
  background:linear-gradient(160deg,#54402a,#2a1e12);color:rgba(232,213,171,.85);
  box-shadow:inset 0 0 0 1.5px rgba(138,107,63,.55),0 3px 8px rgba(0,0,0,.35);
  display:flex;align-items:center;justify-content:center;
}
.sound-orb .orb-on{display:none}
.sound-orb[aria-pressed="true"] .orb-on{display:block}
.sound-orb[aria-pressed="true"] .orb-off{display:none}

/* ---------- the watercolor map ---------- */
.atlas-map{position:absolute;inset:0;width:100%;height:100%;display:block}
.isle-label{font-family:var(--serif);font-size:12px;fill:#3f382c;font-style:italic}
.isle{cursor:pointer}
.map-tip{
  position:absolute;left:50%;bottom:10px;transform:translateX(-50%);
  max-width:92%;text-align:center;font-size:12.5px;font-style:italic;color:var(--ink-soft);
  background:rgba(255,253,246,.92);border:1px solid rgba(120,95,50,.35);border-radius:10px;
  padding:6px 12px;box-shadow:0 3px 8px rgba(50,35,12,.2);opacity:0;transition:opacity .3s;pointer-events:none;
}
.map-tip.show{opacity:1}

/* ---------- phone: fold the spread into one column ---------- */
@media (max-width:899px){
  .room{padding:8px;gap:8px}
  .a{max-width:none}
  .margin-note{max-width:none}
  .book{
    width:100%;flex:1;min-height:0;height:auto;max-height:none;
    grid-template-columns:1fr;grid-template-rows:minmax(0,5fr) 14px minmax(0,6fr);
    padding:9px;border-radius:8px;
  }
  .book::before{inset:5px}
  .page-left{border-radius:5px 5px 1px 1px;box-shadow:inset 0 -20px 26px -20px rgba(58,42,20,.55)}
  .page-right{border-radius:1px 1px 5px 5px;box-shadow:inset 0 20px 26px -20px rgba(58,42,20,.55)}
  .spine{
    background:linear-gradient(180deg,rgba(30,20,10,.55),rgba(250,246,235,.14) 18%,rgba(30,20,10,.28) 50%,rgba(250,246,235,.14) 82%,rgba(30,20,10,.55)),
      linear-gradient(90deg,#efe7d6,#e6dcc4 50%,#efe7d6);
    flex-direction:row;padding:0 18px;
  }
  .spine i{width:5px;height:12px}
  .leaf{padding:16px 18px}
  .bench{padding:12px 14px 14px}
  .q{margin-bottom:8px}
  .plaque{margin-top:10px}
  .rail{width:100%;justify-content:space-between;gap:8px;padding:8px 10px}
  .rail-mid{flex:1;min-width:0}
  .rail-dots i{width:5px;height:5px}
  .rail-next{flex:0 0 auto;padding:11px 13px;font-size:14px}
  .token{width:74px;height:74px}
  .slip{font-size:10.5px}
  .has-plaque .spot{display:none}
  .spot svg{width:56%}
  .has-plaque .margin-note{display:none}
  .flip-sheet{display:none !important}
  .book.turn .page,.book.turn .spine{animation:foldUp .5s cubic-bezier(.35,.7,.35,1)}
  .book.turn-back .page,.book.turn-back .spine{animation:foldDown .5s cubic-bezier(.35,.7,.35,1)}
  @keyframes foldUp{0%{opacity:1;transform:none}45%{opacity:.25;transform:perspective(900px) rotateX(7deg) translateY(-8px)}100%{opacity:1;transform:none}}
  @keyframes foldDown{0%{opacity:1;transform:none}45%{opacity:.25;transform:perspective(900px) rotateX(-7deg) translateY(8px)}100%{opacity:1;transform:none}}
  .cover{inset:9px}
}

@media (max-width:899px) and (max-height:720px){
  .leaf{padding:12px 16px}
  .a{font-size:13px;line-height:1.5}
  .q{font-size:18px}
  .margin-note{display:none}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}
}

/* flip sheet on the left half (back-navigation) */
.flip-sheet.left-side{left:14px;right:calc(50% + 9px);width:auto;transform-origin:right center}