/* ============================================================
   THE REGISTRY — design system
   Palette: Ink #14241D · Paper #F7F6F1 · Seal #BF3526 · Brass #A8842C · Moss #1E5C45
   Type: Instrument Serif (display) · Manrope (body) · Space Grotesk (data)
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Manrope:wght@400;500;600;700&family=Space+Grotesk:wght@400;500;700&display=swap');

:root{
  --ink:#14241D; --ink-2:#1E3329; --paper:#F7F6F1; --paper-2:#EFEDE5;
  --seal:#BF3526; --brass:#A8842C; --moss:#1E5C45; --muted:#68705F;
  --line:rgba(20,36,29,.16); --line-strong:rgba(20,36,29,.34);
  --ok:#1E5C45; --warn:#A8842C; --bad:#BF3526;
  --ff-display:"Instrument Serif",serif; --ff-body:"Manrope",sans-serif; --ff-data:"Space Grotesk",monospace,sans-serif;
  --max:1120px; --r:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--ff-body);background:var(--paper);color:var(--ink);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--ff-display);font-weight:400;line-height:1.08;letter-spacing:.2px}
.eyebrow{font-family:var(--ff-data);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--moss);display:flex;align-items:center;gap:10px}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--brass)}
.data{font-family:var(--ff-data)}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(247,246,241,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:baseline;gap:10px}
.brand .mark{font-family:var(--ff-display);font-size:24px}
.brand .mark em{color:var(--seal);font-style:italic}
.brand .tag{font-family:var(--ff-data);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.nav-links{display:flex;align-items:center;gap:26px;font-size:14px;font-weight:600}
.nav-links a{position:relative;padding:4px 0;color:var(--ink-2)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--seal);transition:width .25s}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--ff-body);font-weight:700;font-size:14px;padding:11px 20px;border-radius:999px;border:1px solid transparent;cursor:pointer;transition:transform .18s,box-shadow .18s,background .18s}
.btn:active{transform:translateY(1px)}
.btn-ink{background:var(--ink);color:var(--paper)}
.btn-ink:hover{box-shadow:0 8px 24px rgba(20,36,29,.25);transform:translateY(-1px)}
.btn-seal{background:var(--seal);color:#fff}
.btn-seal:hover{box-shadow:0 8px 24px rgba(191,53,38,.3);transform:translateY(-1px)}
.btn-ghost{border-color:var(--line-strong);color:var(--ink)}
.btn-ghost:hover{background:var(--paper-2)}
.btn-wa{background:#1E5C45;color:#fff}
.btn-wa:hover{box-shadow:0 8px 24px rgba(30,92,69,.3);transform:translateY(-1px)}
.menu-toggle{display:none;background:none;border:0;font-size:24px;cursor:pointer;color:var(--ink)}

/* ---------- ticker ---------- */
.ticker{border-bottom:1px solid var(--line);background:var(--ink);color:var(--paper);overflow:hidden;white-space:nowrap}
.ticker-track{display:inline-flex;gap:48px;padding:8px 0;animation:tick 38s linear infinite;font-family:var(--ff-data);font-size:12px;letter-spacing:.14em;text-transform:uppercase}
.ticker-track span b{color:var(--brass);font-weight:500}
@keyframes tick{to{transform:translateX(-50%)}}

/* ---------- hero ---------- */
.hero{padding:84px 0 64px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:
  linear-gradient(var(--line) 1px,transparent 1px) 0 0/100% 88px,
  linear-gradient(90deg,var(--line) 1px,transparent 1px) 0 0/88px 100%;
  opacity:.35;mask-image:radial-gradient(640px 420px at 78% 30%,#000 30%,transparent 75%)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center;position:relative}
.hero h1{font-size:clamp(40px,5.6vw,68px);margin:18px 0 16px}
.hero h1 .strike{position:relative;white-space:nowrap}
.hero h1 .strike::after{content:"";position:absolute;left:-2%;right:-2%;top:54%;height:4px;background:var(--seal);transform:scaleX(0);transform-origin:left;animation:strike .5s .9s forwards cubic-bezier(.7,0,.3,1)}
@keyframes strike{to{transform:scaleX(1)}}
.hero p.lede{font-size:18px;color:var(--ink-2);max-width:52ch}
.hero-ctas{display:flex;gap:14px;margin-top:28px;flex-wrap:wrap}
.hero-note{margin-top:18px;font-size:13px;color:var(--muted);display:flex;gap:8px;align-items:center}
.hero-note .dot{width:7px;height:7px;border-radius:50%;background:var(--seal)}

/* hero diagram */
.areabox{position:relative;border:1px solid var(--line-strong);border-radius:var(--r);background:#fff;padding:26px;box-shadow:0 24px 60px rgba(20,36,29,.12)}
.areabox .ab-title{font-family:var(--ff-data);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);margin-bottom:14px;display:flex;justify-content:space-between}
.layer{border-radius:10px;padding:14px;position:relative;border:1.5px solid}
.layer .lbl{font-family:var(--ff-data);font-size:12px;display:flex;justify-content:space-between;gap:8px}
.layer .lbl b{font-weight:700}
.l-super{border-color:var(--seal);background:rgba(191,53,38,.06)}
.l-built{border-color:var(--brass);background:rgba(168,132,44,.08);margin:12px 8px 8px}
.l-carpet{border-color:var(--moss);background:rgba(30,92,69,.08);margin:12px 8px 8px;padding-bottom:34px}
.l-carpet .big{font-family:var(--ff-display);font-size:40px;line-height:1;margin-top:8px}
.areabox .verdict-line{margin-top:16px;padding-top:14px;border-top:1px dashed var(--line-strong);font-size:14px}
.areabox .verdict-line b{color:var(--seal)}
.count{font-variant-numeric:tabular-nums}

/* stamp */
.stamp{position:absolute;top:-26px;right:-18px;width:108px;height:108px;border-radius:50%;border:2.5px solid var(--seal);color:var(--seal);display:flex;align-items:center;justify-content:center;text-align:center;font-family:var(--ff-data);font-size:10px;letter-spacing:.16em;text-transform:uppercase;transform:rotate(12deg);background:rgba(247,246,241,.92);box-shadow:0 6px 18px rgba(191,53,38,.18)}
.stamp::before{content:"";position:absolute;inset:7px;border:1px solid var(--seal);border-radius:50%;opacity:.6}
.stamp.spin{animation:spin 26s linear infinite}
@keyframes spin{to{transform:rotate(372deg)}}

/* ---------- sections ---------- */
section.block{padding:76px 0;border-top:1px solid var(--line)}
.sec-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:36px;flex-wrap:wrap}
.sec-head h2{font-size:clamp(28px,3.4vw,42px);margin-top:10px}
.sec-head .more{font-weight:700;font-size:14px;color:var(--seal);white-space:nowrap}
.sec-head .more:hover{text-decoration:underline}

/* verdict cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.vcard{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;position:relative;transition:transform .22s,box-shadow .22s;overflow:hidden}
.vcard:hover{transform:translateY(-4px);box-shadow:0 18px 44px rgba(20,36,29,.12)}
.vtag{display:inline-block;font-family:var(--ff-data);font-size:11px;letter-spacing:.14em;text-transform:uppercase;padding:5px 12px;border-radius:999px;border:1.5px solid}
.vtag.ok{color:var(--ok);border-color:var(--ok);background:rgba(30,92,69,.07)}
.vtag.warn{color:var(--warn);border-color:var(--warn);background:rgba(168,132,44,.08)}
.vtag.bad{color:var(--bad);border-color:var(--bad);background:rgba(191,53,38,.07)}
.vcard h3{font-size:24px;margin:14px 0 6px}
.vcard .loc{font-family:var(--ff-data);font-size:12px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}
.vcard p{font-size:14.5px;color:var(--ink-2);margin-top:10px}
.vcard .score{margin-top:16px;display:flex;align-items:baseline;gap:8px;font-family:var(--ff-data)}
.vcard .score b{font-size:26px}
.vcard .score span{font-size:12px;color:var(--muted)}
.vcard .read{margin-top:14px;font-weight:700;font-size:13.5px;color:var(--seal)}

/* learn strip / lesson */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.checklist{list-style:none;margin-top:18px}
.checklist li{padding:10px 0 10px 30px;position:relative;border-bottom:1px dashed var(--line);font-size:15px}
.checklist li::before{content:"§";position:absolute;left:2px;color:var(--brass);font-family:var(--ff-display)}

/* test band */
.test-band{background:var(--ink);color:var(--paper);border-radius:18px;padding:48px;display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;position:relative;overflow:hidden}
.test-band::after{content:"";position:absolute;right:-80px;top:-80px;width:300px;height:300px;border:1px solid rgba(247,246,241,.16);border-radius:50%}
.test-band::before{content:"";position:absolute;right:-30px;top:-30px;width:200px;height:200px;border:1px solid rgba(247,246,241,.12);border-radius:50%}
.test-band h2{font-size:clamp(28px,3.4vw,40px)}
.test-band p{color:rgba(247,246,241,.78);margin-top:10px}
.diff-pills{display:flex;gap:10px;margin-top:22px;flex-wrap:wrap}
.pill{font-family:var(--ff-data);font-size:12px;letter-spacing:.12em;text-transform:uppercase;border:1px solid rgba(247,246,241,.35);padding:7px 16px;border-radius:999px}

/* videos */
.vidgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.vid{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff;transition:transform .22s,box-shadow .22s}
.vid:hover{transform:translateY(-4px);box-shadow:0 18px 44px rgba(20,36,29,.12)}
.vid .thumb{aspect-ratio:16/9;background:var(--ink);position:relative;display:flex;align-items:center;justify-content:center}
.vid .thumb iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.vid .play{width:54px;height:54px;border-radius:50%;background:var(--seal);display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px}
.vid .meta{padding:16px}
.vid .meta h3{font-size:19px}
.vid .meta span{font-family:var(--ff-data);font-size:12px;color:var(--muted)}

/* join band */
.join-band{background:var(--moss);color:#fff;border-radius:18px;padding:48px;text-align:center}
.join-band h2{font-size:clamp(26px,3.2vw,38px)}
.join-band p{opacity:.85;max-width:60ch;margin:10px auto 22px}

/* trust row */
.trust{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.trust .t{border-left:2px solid var(--brass);padding:4px 0 4px 18px}
.trust .t b{font-family:var(--ff-display);font-size:20px;font-weight:400;display:block;margin-bottom:4px}
.trust .t span{font-size:14px;color:var(--ink-2)}

/* footer */
footer{background:var(--ink);color:rgba(247,246,241,.8);margin-top:76px}
footer .wrap{padding:48px 24px;display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:36px}
footer h4{font-family:var(--ff-data);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--brass);margin-bottom:14px}
footer a{display:block;padding:4px 0;font-size:14px}
footer a:hover{color:#fff}
.disclosure{grid-column:1/-1;border-top:1px solid rgba(247,246,241,.16);padding-top:20px;font-size:12.5px;line-height:1.7;color:rgba(247,246,241,.55)}

/* ---------- learn page ---------- */
.learn-layout{display:grid;grid-template-columns:260px 1fr;gap:48px;padding:56px 0}
.toc{position:sticky;top:96px;align-self:start;border:1px solid var(--line);border-radius:var(--r);background:#fff;overflow:hidden}
.toc h4{font-family:var(--ff-data);font-size:11px;letter-spacing:.18em;text-transform:uppercase;padding:16px 18px;border-bottom:1px solid var(--line);color:var(--muted)}
.toc a{display:block;padding:11px 18px;font-size:14px;border-left:3px solid transparent}
.toc a:hover{background:var(--paper-2)}
.toc a.on{border-left-color:var(--seal);background:var(--paper-2);font-weight:700}
.toc a.soon{color:var(--muted);cursor:default}
.toc a.soon small{font-family:var(--ff-data);font-size:10px;letter-spacing:.1em}
.lesson h1{font-size:clamp(32px,4vw,48px);margin:12px 0 18px}
.lesson .trapbox{border:1.5px solid var(--seal);background:rgba(191,53,38,.05);border-radius:var(--r);padding:22px;margin:22px 0;font-size:15.5px}
.lesson .trapbox .tb-label{font-family:var(--ff-data);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--seal);margin-bottom:8px}
.lesson h2{font-size:28px;margin:34px 0 12px}
.lesson p{margin:12px 0;max-width:70ch}
.lesson .formula{font-family:var(--ff-data);background:var(--ink);color:var(--paper);padding:18px 22px;border-radius:10px;margin:18px 0;font-size:15px}
.lesson .formula b{color:var(--brass)}
.defs{display:grid;gap:14px;margin:20px 0}
.def{border:1px solid var(--line);border-left:4px solid var(--moss);border-radius:10px;background:#fff;padding:18px}
.def.d2{border-left-color:var(--brass)}.def.d3{border-left-color:var(--seal)}
.def b{font-family:var(--ff-display);font-size:19px;font-weight:400}
.def p{font-size:14.5px;margin:6px 0 0}
.quickcheck{margin:36px 0;border:1px solid var(--line-strong);border-radius:var(--r);background:#fff;padding:26px}
.quickcheck h3{font-family:var(--ff-data);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--moss);margin-bottom:18px}
.q{margin-bottom:22px}
.q .qt{font-weight:700;margin-bottom:10px}
.opts{display:grid;gap:8px}
.opt{border:1px solid var(--line);border-radius:10px;padding:11px 14px;cursor:pointer;font-size:14.5px;transition:border-color .15s,background .15s;background:var(--paper)}
.opt:hover{border-color:var(--ink)}
.opt.correct{border-color:var(--ok);background:rgba(30,92,69,.08)}
.opt.wrong{border-color:var(--bad);background:rgba(191,53,38,.07)}
.expl{display:none;margin-top:10px;font-size:13.5px;color:var(--ink-2);border-left:3px solid var(--brass);padding-left:12px}
.expl.show{display:block}
.lesson-nav{display:flex;justify-content:space-between;margin-top:40px;gap:14px}

/* ---------- test page ---------- */
.test-shell{max-width:760px;margin:0 auto;padding:56px 24px}
.test-shell h1{font-size:clamp(34px,4.4vw,52px);text-align:center}
.test-shell .sub{text-align:center;color:var(--ink-2);margin:12px 0 36px}
.levels{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.level{border:1.5px solid var(--line-strong);border-radius:var(--r);background:#fff;padding:26px;text-align:center;cursor:pointer;transition:transform .2s,box-shadow .2s,border-color .2s}
.level:hover{transform:translateY(-4px);box-shadow:0 16px 38px rgba(20,36,29,.12);border-color:var(--ink)}
.level .lv{font-family:var(--ff-data);font-size:11px;letter-spacing:.2em;text-transform:uppercase}
.level h3{font-size:26px;margin:8px 0}
.level p{font-size:13.5px;color:var(--muted)}
.level.easy .lv{color:var(--ok)}.level.med .lv{color:var(--warn)}.level.hard .lv{color:var(--bad)}
.quiz-card{background:#fff;border:1px solid var(--line-strong);border-radius:var(--r);padding:30px;margin-top:10px;box-shadow:0 20px 50px rgba(20,36,29,.08)}
.progress{height:5px;background:var(--paper-2);border-radius:99px;overflow:hidden;margin-bottom:22px}
.progress i{display:block;height:100%;background:var(--seal);width:0;transition:width .3s}
.qnum{font-family:var(--ff-data);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.quiz-card .qt{font-size:20px;font-weight:700;margin:10px 0 18px;line-height:1.4}
.result-ring{width:150px;height:150px;border-radius:50%;margin:0 auto 18px;display:flex;flex-direction:column;align-items:center;justify-content:center;border:3px solid var(--seal);font-family:var(--ff-data)}
.result-ring b{font-size:38px}
.review .ritem{border-top:1px dashed var(--line);padding:16px 0;font-size:14.5px}
.review .ritem .rq{font-weight:700}
.review .ok{color:var(--ok)}.review .bad{color:var(--bad)}
.hidden{display:none}

/* ---------- verdict detail ---------- */
.vdetail{max-width:840px;margin:0 auto;padding:56px 24px}
.vdetail h1{font-size:clamp(32px,4.2vw,50px);margin:14px 0}
.meta-row{display:flex;gap:18px;flex-wrap:wrap;font-family:var(--ff-data);font-size:12.5px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}
.gatetable,.scoretable{width:100%;border-collapse:collapse;margin:18px 0;background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;font-size:14.5px}
.gatetable th,.scoretable th{font-family:var(--ff-data);font-size:11px;letter-spacing:.14em;text-transform:uppercase;text-align:left;padding:12px 16px;background:var(--paper-2);color:var(--muted)}
.gatetable td,.scoretable td{padding:12px 16px;border-top:1px solid var(--line)}
.g-ok{color:var(--ok);font-weight:700}.g-warn{color:var(--warn);font-weight:700}.g-bad{color:var(--bad);font-weight:700}
.callout{border-left:4px solid var(--brass);background:#fff;border-radius:0 var(--r) var(--r) 0;padding:18px 22px;margin:22px 0;font-size:15px}

/* reveal on scroll */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s,transform .6s}
.reveal.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}
@media (max-width:900px){
  .hero-grid,.split,.test-band{grid-template-columns:1fr}
  .learn-layout{grid-template-columns:1fr}
  .toc{position:static}
  .trust{grid-template-columns:1fr}
  footer .wrap{grid-template-columns:1fr 1fr}
  .levels{grid-template-columns:1fr}
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;background:var(--paper);flex-direction:column;padding:18px 24px;gap:16px;border-bottom:1px solid var(--line)}
  .nav-links.open{display:flex}
  .menu-toggle{display:block}
  .stamp{width:88px;height:88px;top:-18px;right:-8px}
}