:root{
  color-scheme:dark;
  --bg:#0c0b0e; --bg-2:#131217; --bg-3:#1a1920; --bg-4:#22212a; --sunk:#09080b;
  --ink:#f2ede0; --ink-2:#cbc4b2; --ink-3:#958e7e;
  --gold:#e8b83a; --gold-hi:#f4d27a; --gold-dim:#7d6428;
  --lapis:#3f73e6; --lapis-hi:#8fb0ff;
  --amethyst:#b48cf6; --amethyst-dim:#5a4680;
  --true:#3fae6a; --true-bg:rgba(63,174,106,.14);
  --false:#d9564f; --false-bg:rgba(217,86,79,.14);
  --crimson:#c8453a;
  --line:rgba(201,162,74,.28); --line-2:rgba(242,237,224,.10); --line-3:rgba(242,237,224,.18);
  --display:"Libre Caslon Display","Libre Caslon Text",Georgia,"Times New Roman",serif;
  --serif:"Libre Caslon Text",Georgia,"Times New Roman",serif;
  --sans:"Instrument Sans",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --r:12px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--serif);font-size:18px;line-height:1.62;
  background-image:radial-gradient(1100px 520px at 50% -180px,rgba(232,184,58,.07),transparent 70%)}
::selection{background:rgba(232,184,58,.3)}
a{color:var(--gold-hi)}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--gold-hi);outline-offset:3px}

/* ---------- the reminder at the top ---------- */
.rec-reminder{display:flex;gap:10px 16px;align-items:center;flex-wrap:wrap;padding-block:12px;padding-inline:max(16px,calc((100% - 1024px) / 2));background:#2a0d0b;border-bottom:2px solid var(--crimson);font-family:var(--sans);font-size:.95rem;color:#ffd6d1}
.rec-reminder[hidden]{display:none}
.rec-reminder b{color:#fff}
.rec-text{flex:1 1 320px}
.rec-dot{flex:none;width:14px;height:14px;border-radius:50%;background:var(--crimson);animation:recpulse 1.6s ease-out infinite}
@keyframes recpulse{0%{box-shadow:0 0 0 0 rgba(200,69,58,.6)}100%{box-shadow:0 0 0 12px rgba(200,69,58,0)}}
.rec-reminder button{appearance:none;cursor:pointer;border-radius:8px;border:1.5px solid #e07a70;background:var(--crimson);color:#fff;padding:8px 14px;font-family:var(--sans);font-weight:700;font-size:.88rem}
.rec-reminder button.quiet{background:transparent;color:#ffd6d1}

/* ---------- phase band: live navigation ---------- */
.phaseband{position:sticky;top:env(safe-area-inset-top,0px);z-index:40;background:rgba(12,11,14,.86);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.phases{max-width:1080px;margin:0 auto;display:grid;grid-template-columns:repeat(5,1fr);gap:0}
.phase-btn{appearance:none;background:none;border:0;border-bottom:3px solid transparent;padding:14px 10px 11px;cursor:pointer;
  font-family:var(--sans);font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);display:flex;gap:9px;align-items:baseline;justify-content:center;transition:color .2s,border-color .2s}
.phase-btn .n{font-family:var(--display);font-size:1.05rem;letter-spacing:0;color:inherit;opacity:.9}
.phase-btn .t{font-family:var(--sans);font-size:.68rem;letter-spacing:.04em;opacity:.7;font-weight:500;text-transform:none}
.phase-btn:hover{color:var(--ink)}
.phase-btn.seen{color:var(--ink-2)}
.phase-btn.on{color:var(--gold-hi);border-bottom-color:var(--gold)}

/* ---------- page ---------- */
.page{max-width:1080px;margin:0 auto;padding:0 28px 120px}
header.top{padding:64px 0 28px;max-width:820px}
.eyebrow{font-family:var(--sans);font-size:.74rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--gold)}
h1{font-family:var(--display);font-weight:400;font-size:clamp(2.4rem,5.4vw,3.9rem);line-height:1.02;letter-spacing:-.01em;margin:.25em 0 .3em;text-wrap:balance}
.lede{font-size:1.18rem;color:var(--ink-2);max-width:62ch;margin:0}
.lede b{color:var(--ink);font-weight:700}
section.phase{padding-top:56px;margin-top:24px;scroll-margin-top:64px}
.phase-head{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:26px;margin-bottom:6px}
.time{font-family:var(--sans);font-size:.72rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);border:1px solid var(--line-3);border-radius:999px;padding:3px 10px}
h2{font-family:var(--display);font-weight:400;font-size:clamp(1.9rem,3.6vw,2.6rem);line-height:1.1;margin:0;text-wrap:balance}
h3{font-family:var(--display);font-weight:400;font-size:1.6rem;line-height:1.15;margin:44px 0 10px;text-wrap:balance}
h4{font-family:var(--sans);font-size:.78rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin:0 0 10px}
.prose{max-width:66ch}
.prose p{margin:0 0 .9em}
.prose p:last-child{margin-bottom:0}
.say{font-family:var(--serif);font-style:italic;color:var(--gold-hi)}
.part-label{font-family:var(--sans);font-size:.74rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--amethyst);margin-top:56px}
.lesson{margin:22px 0 10px;padding:26px 28px;border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(180deg,var(--bg-2),rgba(19,18,23,.6))}
.lesson > h4{color:var(--gold-hi)}
.rule-box{margin:18px 0 0;padding:16px 20px;border-left:3px solid var(--gold);background:rgba(232,184,58,.07);border-radius:0 10px 10px 0;font-size:1.08rem}
.rule-box b{color:var(--gold-hi)}
.rules{list-style:none;margin:0 0 .9em;padding:0;display:grid;gap:8px}
.rules li{padding-left:16px;border-left:2px solid var(--line-3)}
.stmt{display:block;margin:10px 0;padding:12px 16px;border-radius:10px;background:var(--bg-3);border:1px solid var(--line-2);font-style:normal}
.stmt .if,.stmt .then,.vh-stmt b{display:inline-block;border:1.5px solid var(--ink);border-radius:6px;padding:0 8px;margin:0 4px;color:var(--ink);font-family:var(--sans);font-size:.78em;font-weight:700;letter-spacing:.08em;text-transform:uppercase;line-height:1.6;vertical-align:.08em}
.stmt .if,.vh-stmt b:first-child{margin-left:0}
.defs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:18px 0 0}
.def{padding:16px 18px;border-radius:10px;background:var(--bg-3);border:1px solid var(--line-2)}
.def dt{font-family:var(--display);font-size:1.25rem;margin-bottom:4px}
.def dd{margin:0;color:var(--ink-2);font-size:.98rem}
.swatch{display:inline-block;width:.8em;height:.8em;border-radius:3px;vertical-align:-.05em;margin-right:.35em}
.sw-gold{background:var(--gold)} .sw-lapis{background:var(--lapis)} .sw-am{background:var(--amethyst)} .sw-bone{background:var(--ink)}
.sw-true{background:var(--true)} .sw-false{background:var(--false)}

.sub-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin:44px 0 8px}
.sub-head h3{margin:0}

/* ---------- the word deck ---------- */
.deck{margin:16px 0 0;border:1px solid var(--line);border-radius:var(--r);background:var(--bg-2)}
/* the word list: one dropdown per group, in the card's top line, drawn in the page (a native select's popup can drop out of a screen share) */
.deck-menus{display:flex;flex-wrap:wrap;gap:6px}
.vmenu-btn{appearance:none;cursor:pointer;display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line-3);background:transparent;color:var(--ink-2);border-radius:999px;padding:5px 11px 5px 13px;font-family:var(--sans);font-size:.78rem;font-weight:600;letter-spacing:.01em;text-transform:none}
.vmenu-btn:hover{border-color:var(--gold);color:var(--ink)}
.vmenu.on .vmenu-btn{border-color:var(--gold);color:var(--gold-hi)}
.vmenu.open .vmenu-btn{background:var(--ink);color:#15131a;border-color:var(--ink)}
.vm-caret{font-size:.85em;line-height:1;transition:transform .15s}
.vmenu.open .vm-caret{transform:rotate(180deg)}
.vmenu-list{position:absolute;left:0;right:0;top:calc(100% + 8px);z-index:30;padding:12px 14px 14px;background:var(--bg-3);border:1px solid var(--line-3);border-radius:12px;box-shadow:0 18px 40px rgba(0,0,0,.55);text-transform:none;letter-spacing:normal}
.vmenu-list[hidden]{display:none}
.vmenu-head{margin-bottom:9px;font-size:.66rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3)}
.vchips{display:flex;flex-wrap:wrap;gap:6px}
.vchip{appearance:none;cursor:pointer;border:1px solid var(--line-3);background:transparent;color:var(--ink-3);border-radius:999px;padding:4px 11px;font-family:var(--sans);font-size:.8rem;font-weight:600}
.vchip:hover{border-color:var(--gold);color:var(--ink)}
.vchip.seen{color:var(--ink);border-color:rgba(242,237,224,.4)}
.vchip.on{background:var(--ink);color:#15131a;border-color:var(--ink)}
.vchip[data-mark="sure"]::after{content:" ●";font-size:.72em;vertical-align:.1em}
.vchip[data-mark="not"]::after{content:" ?";font-weight:800}
.deck-card{padding:22px 24px 20px}
.deck-top{position:relative;display:flex;justify-content:space-between;align-items:center;gap:10px 12px;flex-wrap:wrap;font-family:var(--sans);font-size:.7rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3)}
.deck-word{font-family:var(--display);font-size:clamp(2rem,4.4vw,3rem);line-height:1.05;margin:8px 0 14px;text-wrap:balance}
.deck-pic{position:relative}
.deck-html{position:absolute;inset:0;background:#0f0e12;border-radius:10px;border:1px solid var(--line-2);display:grid;place-items:center;padding:18px;overflow:auto}
.deck-html[hidden]{display:none}
.vh{display:grid;gap:14px;max-width:660px;width:100%}
.vh-stmt{font-family:var(--serif);font-size:1.3rem;line-height:1.4;padding:12px 18px;border-radius:10px;background:var(--bg-3);border:1px solid var(--line-2)}
.vh-parts{display:grid;grid-template-columns:1fr 1fr;gap:10px;font-family:var(--sans);font-size:1rem;color:var(--ink)}
.vh-parts>div{padding:10px 14px;border:1px dashed var(--line-3);border-radius:10px}
.vh-lab{display:block;font-size:.68rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);margin-bottom:2px}
.vh-swap{font-family:var(--sans);font-size:.9rem;color:var(--ink-3);text-align:center}
.vh-proof{display:grid;gap:8px;font-family:var(--sans);font-size:1.02rem}
.vh-row{display:grid;grid-template-columns:1.1fr 1fr;gap:14px;padding:10px 14px;border-radius:10px;background:var(--bg-3);border:1px solid var(--line-2)}
.vh-row span:last-child{color:var(--ink-2)}
.deck-meaning{margin:14px 0 0;padding:14px 18px;border-radius:10px;background:var(--bg-3);border-left:3px solid var(--gold);font-size:1.12rem;max-width:66ch}
.deck-meaning[hidden]{display:none}
.deck-ctrls{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:14px}
.deck-sure{display:inline-flex;gap:6px}
.deck-sure button{appearance:none;cursor:pointer;border-radius:999px;border:1.5px solid var(--line-3);background:transparent;color:var(--ink-2);padding:6px 12px;font-family:var(--sans);font-weight:600;font-size:.82rem}
.deck-sure button.on{background:var(--ink);color:#15131a;border-color:var(--ink)}
.deck-nav{margin-left:auto;display:inline-flex;gap:8px}
.ctl[disabled]{opacity:.4;cursor:default}

/* a proof: the statement on screen, its reason behind a button */
.steps.proof .st{display:grid;gap:4px}
.steps.proof .ps{font-size:1.05rem}
.steps.proof .pr{font-family:var(--sans);font-size:.92rem;color:var(--ink-2)}
.steps.proof .pr.hid{color:var(--ink-3);letter-spacing:.04em}

/* ---------- figures ---------- */
figure.fig{margin:22px 0 8px}
.fig-canvas{position:relative;width:100%;border-radius:10px;background:#0f0e12;border:1px solid var(--line-2);overflow:hidden;touch-action:pan-y}
.fig-canvas.drag{touch-action:none}
.fig-canvas .nofig{padding:18px;margin:0;color:var(--ink-3);font-family:var(--sans);font-size:.92rem}
.fig-canvas canvas{display:block}
figcaption{font-family:var(--sans);font-size:.86rem;color:var(--ink-3);margin-top:9px;max-width:70ch}
.ctrls{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;align-items:center}
.ctl{appearance:none;cursor:pointer;border:1.5px solid var(--amethyst);background:rgba(180,140,246,.08);color:#e3d4ff;border-radius:999px;padding:7px 15px;font-family:var(--sans);font-size:.86rem;font-weight:600;transition:background .15s,transform .1s}
.ctl:hover{background:rgba(180,140,246,.2)}
.ctl:active{transform:translateY(1px)}
.ctl.on{background:var(--amethyst);color:#17122a}
.ctl.pair{border-color:rgba(242,237,224,.35);background:transparent;color:var(--ink)}
.ctl.pair.on{background:var(--ink);color:#15131a;border-color:var(--ink)}
.readout{margin-top:14px;padding:14px 18px;border-radius:10px;background:var(--bg-3);border:1px solid var(--line-2);font-family:var(--sans);font-size:.95rem;color:var(--ink-2);min-height:3.2em}
.readout b{color:var(--ink)}
.readout .nm{font-family:var(--display);font-size:1.3rem;color:var(--ink);display:block;margin-bottom:2px}
.chip{display:inline-flex;align-items:center;gap:6px;font-family:var(--sans);font-size:.82rem;font-weight:700;letter-spacing:.02em;border-radius:999px;padding:3px 11px;margin:6px 6px 0 0}
.chip.t{color:#bff0d2;background:var(--true-bg);border:1px solid rgba(63,174,106,.55)}
.chip.f{color:#ffc9c5;background:var(--false-bg);border:1px solid rgba(217,86,79,.55)}
.chip.n{color:var(--ink-2);background:rgba(242,237,224,.06);border:1px solid var(--line-3)}

/* ---------- problems ---------- */
.item{margin:40px 0;padding:2px 0 6px 24px;border-left:3px solid var(--line);position:relative}
.item-top{display:flex;gap:12px;align-items:baseline;flex-wrap:wrap;margin-bottom:6px}
.item-tag{font-family:var(--sans);font-size:.7rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3)}
.item-kind{font-family:var(--sans);font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;border-radius:999px;padding:2px 9px;border:1px solid var(--line-3);color:var(--ink-2)}
.prompt{font-size:1.14rem;max-width:64ch;margin:4px 0 0}
.prompt .var{font-style:italic;color:var(--ink)}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin:20px 0 4px}
.opts.figs{grid-template-columns:repeat(2,minmax(0,1fr))}
.opt{appearance:none;cursor:pointer;text-align:left;display:flex;gap:14px;align-items:center;padding:14px 16px;border-radius:10px;border:1.5px solid rgba(242,237,224,.2);background:var(--bg-3);color:var(--ink);font-family:var(--sans);font-size:1.02rem;font-weight:500;transition:border-color .15s,background .15s,opacity .2s}
.opt:hover{border-color:var(--gold)}
.opt .k{font-family:var(--display);font-size:1.35rem;color:var(--gold);min-width:1em;line-height:1}
.opt.fig-opt{flex-direction:column;align-items:stretch;gap:8px;padding:10px}
.opt.fig-opt .k{align-self:flex-start}
.opt.tried{opacity:.45;border-style:dashed}
.opt.tried .k{text-decoration:line-through}
.opt.sel.right{border-color:var(--true);background:var(--true-bg);opacity:1}
.opt.sel.wrong{border-color:var(--false);background:var(--false-bg);opacity:1}
.fb{margin:12px 0 0;padding:14px 18px;border-radius:10px;font-family:var(--sans);font-size:.98rem;display:flex;gap:14px;align-items:flex-start}
.fb[hidden]{display:none}
.fb.right{background:var(--true-bg);border:1px solid rgba(63,174,106,.45);color:#d9f5e4}
.fb.wrong{background:var(--false-bg);border:1px solid rgba(217,86,79,.45);color:#ffe0dd}
.fb .word{font-weight:700;font-size:1.05rem;display:block;color:#fff}
.fb .fbt{display:block}
.fb .ptr{display:block;margin-top:4px;color:var(--ink-3);font-size:.86rem}
.linkish{appearance:none;background:none;border:0;padding:0;color:inherit;text-decoration:underline;text-underline-offset:3px;cursor:pointer;font:inherit}
.burst{position:relative;flex:none;width:34px;height:34px}
.burst::before{content:"";position:absolute;inset:-10px;border-radius:50%;background:repeating-conic-gradient(rgba(63,174,106,.55) 0 8deg,transparent 8deg 30deg);-webkit-mask:radial-gradient(circle,transparent 42%,#000 44%,#000 60%,transparent 62%);mask:radial-gradient(circle,transparent 42%,#000 44%,#000 60%,transparent 62%);opacity:0;animation:burst .7s .1s ease-out forwards}
@keyframes burst{0%{opacity:0;transform:scale(.6)}40%{opacity:1}100%{opacity:0;transform:scale(1.35)}}
.check-svg{flex:none;width:34px;height:34px}
.check-svg path{fill:none;stroke:var(--true);stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:40;stroke-dashoffset:40;animation:draw .5s .05s ease-out forwards}
.x-svg{flex:none;width:30px;height:30px}
.x-svg path{fill:none;stroke:var(--false);stroke-width:3.5;stroke-linecap:round}
@keyframes draw{to{stroke-dashoffset:0}}

/* steps with right-side answer buttons */
.steps{list-style:none;padding:0;margin:18px 0 4px;display:flex;flex-direction:column;gap:8px}
.step{display:grid;grid-template-columns:34px 1fr auto;gap:12px;align-items:center;padding:12px 14px;border-radius:10px;background:var(--bg-3);border:1px solid var(--line-2)}
.step .sn{font-family:var(--display);font-size:1.2rem;color:var(--gold);text-align:center}
.step .st{min-height:1.4em}
.step .st.hid{color:var(--ink-3);letter-spacing:.3em}
.step.shown{border-color:rgba(232,184,58,.35)}
.step.shown .st{animation:rise .25s ease-out}
.step.gap{background:rgba(180,140,246,.06);border-color:rgba(180,140,246,.35)}
.show-btn{appearance:none;cursor:pointer;border:0;border-radius:8px;padding:7px 14px;background:var(--gold);color:#1a1405;font-family:var(--sans);font-weight:700;font-size:.82rem;white-space:nowrap}
.show-btn:hover{background:var(--gold-hi)}
.show-btn[disabled]{background:transparent;color:var(--ink-3);border:1px solid var(--line-3);cursor:default}
.gap-opts{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.gap-opts .opt{padding:8px 14px;font-size:.95rem}
@keyframes rise{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

/* try-a-value slider */
.tryx{display:inline-flex;gap:12px;align-items:center;flex-wrap:wrap;font-family:var(--sans);font-size:.95rem;color:var(--ink-2);padding:8px 16px;border:1px solid rgba(180,140,246,.45);border-radius:999px;background:rgba(180,140,246,.06)}
.tryx i{font-family:var(--serif);color:var(--ink)}
.tryx input{accent-color:#b48cf6;width:min(240px,50vw)}
.tryx output{font-family:var(--display);font-size:1.25rem;color:var(--ink);min-width:1.6em;text-align:right}

/* four doors */
.doors{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 0;padding-top:16px;border-top:1px dashed var(--line-3)}
.door{appearance:none;cursor:pointer;display:inline-flex;gap:9px;align-items:center;border-radius:10px;padding:9px 16px;font-family:var(--sans);font-weight:600;font-size:.92rem;background:transparent;transition:background .15s}
.door .ic{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;font-size:.8rem;font-weight:700}
.door.nudge{border:1.5px solid var(--gold);color:var(--gold-hi)} .door.nudge .ic{background:var(--gold);color:#1a1405}
.door.check{border:1.5px solid var(--lapis);color:var(--lapis-hi)} .door.check .ic{background:var(--lapis);color:#fff}
.door.work{border:1.5px solid rgba(242,237,224,.55);color:var(--ink)} .door.work .ic{background:var(--ink);color:#15131a}
.door.nudge[aria-expanded="true"]{background:rgba(232,184,58,.14)}
.door.check[aria-expanded="true"]{background:rgba(63,115,230,.16)}
.door.work[aria-expanded="true"]{background:rgba(242,237,224,.1)}
.door.whole{border:1.5px solid var(--ink);background:var(--ink);color:#15131a} .door.whole .ic{background:#15131a;color:var(--ink)}
.door.whole[aria-expanded="true"]{background:#d8d2c3}
.door.whole.glow{animation:doorglow 1.8s ease-in-out infinite}
@keyframes doorglow{0%,100%{box-shadow:0 0 0 0 rgba(244,210,122,0)}50%{box-shadow:0 0 0 6px rgba(244,210,122,.45)}}
.door-box{margin-top:12px;padding:16px 18px;border-radius:10px;background:var(--bg-3);border-left:3px solid var(--gold);font-family:var(--sans);font-size:.98rem;color:var(--ink-2)}
.door-box[hidden]{display:none}
.door-box.check{border-left-color:var(--lapis)}
.door-box.work{border-left-color:var(--ink)}
.door-box.whole{border-left-color:var(--gold-hi);background:var(--bg-2)}
.wt{display:grid;gap:12px}
.wt-row{display:grid;grid-template-columns:150px 1fr;gap:4px 14px}
.wt-k{font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);padding-top:3px}
.wt-v{color:var(--ink)}
.wt-v ol,.wt-v ul{margin:0;padding-left:20px;display:grid;gap:5px}
.wt-r{display:block;color:var(--ink-2);font-size:.92em}
.door-box .wk{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:6px}
.door-box .wk li{display:grid;grid-template-columns:26px 1fr;gap:8px}
.door-box .wk li b{font-family:var(--display);font-weight:400;color:var(--gold);font-size:1.05rem}
.door-box .wk li[hidden]{display:none}
.door-box .more{margin-top:10px}
.ans-big{display:block;font-family:var(--display);font-size:1.5rem;line-height:1.3;color:var(--ink)}
.ans-list{font-family:var(--sans);font-size:1rem;color:var(--ink)}
.ans-list div{margin:4px 0}

/* games */
.game{margin:34px 0 10px;padding:26px 28px;border-radius:var(--r);border:1px solid rgba(180,140,246,.4);background:linear-gradient(180deg,rgba(180,140,246,.08),rgba(19,18,23,.4))}
.game h4{color:#d7c3ff}
.game .round{font-family:var(--sans);font-size:.8rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3)}
.game-q{font-size:1.12rem;margin:6px 0 0}
.game-stmt{font-family:var(--display);font-size:1.45rem;line-height:1.3;margin:14px 0 0;padding:14px 18px;border-radius:10px;background:var(--bg-3);border:1px solid var(--line-2);max-width:40em}
.calls{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0 0}
.call{appearance:none;cursor:pointer;min-width:150px;padding:12px 20px;border-radius:12px;border:2px solid rgba(242,237,224,.3);background:var(--bg-3);font-family:var(--sans);font-size:1.02rem;font-weight:700;color:var(--ink);transition:border-color .15s,background .15s}
.call:hover{border-color:var(--gold)}
.call.tried{opacity:.45;border-style:dashed}
.call.sel.right{border-color:var(--true);background:var(--true-bg);opacity:1}
.call.sel.wrong{border-color:var(--false);background:var(--false-bg);opacity:1}
.next-row{display:flex;gap:10px;align-items:center;margin-top:14px}

/* break it down */
.bline{display:grid;grid-template-columns:34px 1fr auto;gap:12px;align-items:center;padding:12px 14px;border-radius:10px;background:var(--bg-3);border:1px solid var(--line-2)}
.bline .sn{font-family:var(--display);font-size:1.2rem;color:var(--ink-3);text-align:center}
.bline .bexp{grid-column:2 / 4;font-family:var(--sans);font-size:.95rem;padding:10px 12px;border-radius:8px;margin-top:4px}
.bline .bexp[hidden]{display:none}
.bline .bexp.brk{background:var(--false-bg);border:1px solid rgba(217,86,79,.4);color:#ffe0dd}
.bline .bexp.ok{background:rgba(242,237,224,.05);border:1px solid var(--line-3);color:var(--ink-2)}
.bline.broken{border-color:rgba(217,86,79,.6)}
.brk-btn{appearance:none;cursor:pointer;border-radius:8px;padding:7px 12px;border:1.5px solid rgba(217,86,79,.6);background:transparent;color:#ffb3ad;font-family:var(--sans);font-weight:700;font-size:.8rem;white-space:nowrap}
.brk-btn:hover{background:var(--false-bg)}
.holds-row{display:flex;gap:10px;align-items:center;margin-top:12px;flex-wrap:wrap}
.holds-btn{appearance:none;cursor:pointer;border-radius:8px;padding:8px 14px;border:1.5px solid rgba(63,174,106,.6);background:transparent;color:#bff0d2;font-family:var(--sans);font-weight:700;font-size:.85rem}
.holds-btn:hover{background:var(--true-bg)}

/* roots */
details.roots{margin:26px 0 0;border:1px solid var(--line);border-radius:10px;background:rgba(232,184,58,.04)}
details.roots>summary{cursor:pointer;list-style:none;padding:12px 18px;font-family:var(--sans);font-weight:600;font-size:.9rem;color:var(--gold-hi);display:flex;gap:10px;align-items:center}
details.roots>summary::-webkit-details-marker{display:none}
details.roots>summary::before{content:"";width:0;height:0;border-left:7px solid currentColor;border-top:5px solid transparent;border-bottom:5px solid transparent;transition:transform .15s}
details.roots[open]>summary::before{transform:rotate(90deg)}
.root-list{padding:4px 18px 16px;display:grid;gap:10px}
.root{display:grid;grid-template-columns:minmax(150px,220px) 1fr;gap:14px;font-size:.98rem}
.root .w{font-family:var(--display);font-size:1.12rem;color:var(--ink)}
.root .o{color:var(--ink-2)}
.root .o i{color:var(--gold-hi)}
details.legend{margin-top:14px;border:1px solid var(--line-2);border-radius:10px}
details.legend>summary{cursor:pointer;padding:10px 16px;font-family:var(--sans);font-weight:600;font-size:.86rem;color:var(--ink-2);list-style:none}
details.legend>summary::-webkit-details-marker{display:none}
details.legend .lg{padding:4px 16px 14px;font-family:var(--sans);font-size:.92rem;color:var(--ink-2);display:grid;gap:6px}

/* homework */
.hw{margin:24px 0;padding:28px;border-radius:var(--r);border:2px solid var(--gold);background:linear-gradient(180deg,rgba(232,184,58,.07),var(--bg-2))}
.hw .shot{font-family:var(--sans);font-size:.86rem;color:var(--gold-hi);font-weight:600;letter-spacing:.02em}
.hw-roots{display:grid;gap:10px;margin:16px 0 8px}
.hw-root{display:grid;grid-template-columns:minmax(170px,240px) 1fr;gap:14px;align-items:center}
.hw-root .w{font-family:var(--display);font-size:1.1rem}
.blank{border-bottom:1.5px solid var(--ink-3);height:1.6em}
.hw-q{margin:18px 0 0;padding-top:16px;border-top:1px dashed var(--line-3)}
.close-box{margin:26px 0 0;padding:22px 26px;border-radius:var(--r);background:var(--bg-3);border:1px solid var(--line-2)}
.close-box .one{font-family:var(--display);font-size:1.45rem;line-height:1.3;color:var(--ink)}

/* tutor layer (T) */
.tutor{display:none}
body.tutor-on .tutor{display:block}
.tut{margin-top:16px;padding:14px 16px;border:1.5px dashed var(--crimson);border-radius:10px;background:rgba(200,69,58,.08);font-family:var(--sans);font-size:.88rem;color:#f3c9c4}
.tut b{color:#ffe1dd}
.tut .tl{display:grid;grid-template-columns:110px 1fr;gap:4px 12px}
.tut .tl span:nth-child(odd){color:#e79a92;font-weight:700;text-transform:uppercase;font-size:.72rem;letter-spacing:.08em;padding-top:2px}
.tut ul{margin:4px 0 0;padding-left:18px}
.game .tut,.close-box .tut{margin-top:14px}
.sat-btn{appearance:none;cursor:pointer;margin-top:10px;border-radius:8px;border:1.5px solid var(--crimson);background:transparent;color:#ffd0ca;padding:6px 12px;font-family:var(--sans);font-weight:700;font-size:.8rem}
.sat-btn.done{background:var(--crimson);color:#fff}
.tutor-strip{position:fixed;left:0;right:0;bottom:0;z-index:50;background:rgba(40,12,10,.96);border-top:2px solid var(--crimson);font-family:var(--sans);font-size:.85rem;color:#ffd6d1;padding:10px 18px calc(10px + env(safe-area-inset-bottom,0px));display:none;gap:14px;align-items:center;flex-wrap:wrap}
body.tutor-on .tutor-strip{display:flex}
.tutor-strip .clk{font-family:var(--display);font-size:1.3rem;color:#fff;min-width:3.6em}
.tutor-strip button{appearance:none;cursor:pointer;border-radius:8px;border:1.5px solid #e07a70;background:transparent;color:#ffd6d1;padding:5px 10px;font-weight:700;font-size:.8rem}
.tutor-strip input{flex:1;min-width:200px;background:#1c0908;border:1px solid #7a2b24;border-radius:8px;color:#fff;padding:6px 10px;font:inherit}
.tutor-panel{position:fixed;right:16px;bottom:64px;z-index:51;width:min(520px,calc(100vw - 32px));max-height:60vh;overflow:auto;background:#1c0b0a;border:2px solid var(--crimson);border-radius:12px;padding:16px;font-family:var(--sans);font-size:.85rem;color:#ffd6d1;display:none}
.tutor-panel.open{display:block}
.tutor-panel textarea{width:100%;min-height:220px;background:#120605;color:#fff;border:1px solid #7a2b24;border-radius:8px;padding:10px;font:12px/1.5 ui-monospace,Menlo,Consolas,monospace}
.hwrec{display:grid;grid-template-columns:auto auto auto;gap:6px 10px;align-items:center;margin:8px 0}
.hwrec button{appearance:none;cursor:pointer;border-radius:8px;border:1.5px solid #e07a70;background:transparent;color:#ffd6d1;padding:4px 12px;font-weight:700;font-size:.78rem}
.hwrec span{font-weight:700;color:#fff}
.hwrec button.on-r{background:#1f5c38;border-color:#3fae6a;color:#fff}
.hwrec button.on-w{background:#6b1f1a;border-color:#d9564f;color:#fff}

footer.foot{margin-top:70px;padding-top:22px;border-top:1px solid var(--line);font-family:var(--sans);font-size:.82rem;color:var(--ink-3)}

@media (max-width:760px){
  .page{padding:0 16px 120px}
  .phase-btn{font-size:.62rem;padding:12px 4px 9px;gap:4px;flex-direction:column;align-items:center}
  .phase-btn .t{display:none}
  .lesson,.game,.hw{padding:20px 16px}
  .item{padding-left:14px}
  .root,.hw-root{grid-template-columns:1fr;gap:2px}
  .defs,.opts.figs{grid-template-columns:1fr}
  .vh-parts,.vh-row{grid-template-columns:1fr}
  .deck-card{padding:18px 16px}
  .deck-nav{margin-left:0}
  .step,.bline{grid-template-columns:26px 1fr;}
  .wt-row{grid-template-columns:1fr}
  .step .show-btn,.bline .brk-btn{grid-column:2}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *{animation:none !important;transition:none !important}
  .check-svg path{stroke-dashoffset:0}
}