/* Exam Kata — "kata practice sheet × vermilion seal". docs/design.md */

@font-face{font-family:"Fraunces";src:url("../fonts/fraunces-latin.woff2") format("woff2");font-weight:400 900;font-style:normal;font-display:swap}
@font-face{font-family:"Fraunces";src:url("../fonts/fraunces-latin-italic.woff2") format("woff2");font-weight:400 900;font-style:italic;font-display:swap}
@font-face{font-family:"Atkinson";src:url("../fonts/atkinson-next-latin.woff2") format("woff2");font-weight:200 800;font-style:normal;font-display:swap}
@font-face{font-family:"Atkinson";src:url("../fonts/atkinson-next-latin-italic.woff2") format("woff2");font-weight:200 800;font-style:italic;font-display:swap}

:root{
  --paper:#f6f0e4;--paper-2:#efe6d4;--card:#fffdf8;--card-2:#fbf6ec;
  --ink:#1d1b17;--ink-2:#4a453b;--ink-3:#7b7466;--line:#ddd2bd;--line-2:#e9e0cd;
  --seal:#c43d2a;--seal-deep:#9b2b1b;--seal-wash:#f7e3dc;
  --indigo:#233a70;--indigo-2:#3a5bb0;--indigo-wash:#e4e9f6;
  --moss:#2c7a4d;--moss-wash:#e1f0e6;--rust:#b2341f;--rust-wash:#f8e1db;--gold:#b8862a;--gold-wash:#f6ecd6;
  --shadow:0 1px 0 rgba(60,45,20,.06),0 10px 30px -12px rgba(60,45,20,.22);
  --shadow-lg:0 2px 0 rgba(60,45,20,.05),0 24px 60px -20px rgba(60,45,20,.35);
  --r:14px;--r-sm:10px;
  --f-display:"Fraunces",ui-serif,Georgia,"Times New Roman",serif;
  --f-body:"Atkinson",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --f-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --wrap:1180px;--read:760px;
  color-scheme:light;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:84px}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.65 var(--f-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:-1;background:
  radial-gradient(1200px 600px at 85% -10%,color-mix(in srgb,var(--seal) 7%,transparent),transparent 60%),
  radial-gradient(900px 500px at -10% 30%,color-mix(in srgb,var(--indigo) 6%,transparent),transparent 60%)}
img{max-width:100%;height:auto;display:block}
a{color:var(--indigo-2);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--seal)}
a,button,summary,select,label[for],[role=button],input[type=checkbox],input[type=radio],input[type=submit]{cursor:pointer}
button:disabled,[aria-disabled=true]{cursor:not-allowed}
:focus-visible{outline:3px solid color-mix(in srgb,var(--indigo-2) 70%,transparent);outline-offset:2px;border-radius:6px}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:650;line-height:1.15;letter-spacing:-.01em;margin:0 0 .5em;font-variation-settings:"SOFT" 40,"WONK" 0,"opsz" 72}
h1{font-size:clamp(2rem,1.2rem + 3.4vw,3.6rem);font-variation-settings:"SOFT" 60,"WONK" 1,"opsz" 144;letter-spacing:-.02em}
h2{font-size:clamp(1.5rem,1.1rem + 1.4vw,2.2rem)}
h3{font-size:1.25rem}
p{margin:0 0 1em}
small,.small{font-size:.875rem}
.muted{color:var(--ink-3)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.read{max-width:var(--read)}
.sr-only{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:12px;top:-60px;background:var(--ink);color:var(--paper);padding:10px 14px;border-radius:8px;z-index:100}
.skip:focus{top:12px}
.eyebrow{font:700 .75rem/1 var(--f-body);letter-spacing:.16em;text-transform:uppercase;color:var(--seal)}
.lede{font-size:1.2rem;color:var(--ink-2);max-width:62ch}
hr.rule{border:0;height:1px;background:linear-gradient(90deg,transparent,var(--line),transparent);margin:48px 0}

/* ---------- header / footer ---------- */
.site-header{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--paper) 86%,transparent);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line-2)}
.site-header .wrap{display:flex;align-items:center;gap:20px;height:68px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink)}
.brand:hover{color:var(--ink)}
.brand-mark{width:40px;height:40px;border-radius:10px;background:var(--seal);color:#fff;display:grid;place-items:center;font:800 1.05rem/1 var(--f-display);letter-spacing:-.04em;box-shadow:inset 0 0 0 2px rgba(255,255,255,.25),inset 0 0 0 4px var(--seal),inset 0 0 0 5px rgba(255,255,255,.35),0 6px 14px -6px var(--seal);transform:rotate(-4deg);transition:transform .3s}
.brand:hover .brand-mark{transform:rotate(0) scale(1.04)}
.brand-name{font:700 1.3rem/1 var(--f-display);letter-spacing:-.02em;font-variation-settings:"SOFT" 80,"WONK" 1,"opsz" 48}
.brand-name em{font-style:italic;color:var(--seal);font-weight:600}
.nav{margin-left:auto;display:flex;align-items:center;gap:6px}
.nav a{color:var(--ink-2);text-decoration:none;font-weight:600;font-size:.95rem;padding:8px 12px;border-radius:999px;transition:background .2s,color .2s}
.nav a:hover,.nav a[aria-current=page]{background:var(--card);color:var(--ink)}
.nav .nav-cta{background:var(--ink);color:var(--paper)}
.nav .nav-cta:hover{background:var(--seal);color:#fff}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:10px;width:44px;height:44px;color:var(--ink);font-size:1.3rem}
@media (max-width:820px){
  .menu-btn{display:grid;place-items:center}
  .nav{position:absolute;left:0;right:0;top:68px;flex-direction:column;align-items:stretch;gap:2px;padding:10px 16px 16px;background:var(--paper);border-bottom:1px solid var(--line);display:none}
  .nav.open{display:flex}
  .nav a{padding:12px 14px;border-radius:10px}
}
.site-footer{margin-top:96px;border-top:1px solid var(--line);background:var(--paper-2);padding:48px 0 32px;font-size:.95rem;color:var(--ink-2)}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px}
.footer-grid h3{font:700 .8rem/1 var(--f-body);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);margin-bottom:14px}
.footer-grid ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.footer-grid a{color:var(--ink-2);text-decoration:none}
.footer-grid a:hover{color:var(--seal);text-decoration:underline}
.footer-note{margin-top:36px;padding-top:20px;border-top:1px solid var(--line);font-size:.85rem;color:var(--ink-3);display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between}
@media (max-width:820px){.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}}

/* ---------- buttons / chips ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:12px 22px;border-radius:var(--r-sm);border:1.5px solid var(--ink);background:var(--ink);color:var(--paper);font:700 1rem/1.1 var(--f-body);text-decoration:none;transition:transform .15s,box-shadow .2s,background .2s,color .2s;box-shadow:0 3px 0 color-mix(in srgb,var(--ink) 30%,transparent)}
.btn:hover{background:var(--seal);border-color:var(--seal);color:#fff;transform:translateY(-1px)}
.btn:active{transform:translateY(1px);box-shadow:none}
.btn-ghost{background:transparent;color:var(--ink);box-shadow:none}
.btn-ghost:hover{background:var(--card);color:var(--ink);border-color:var(--ink)}
.btn-seal{background:var(--seal);border-color:var(--seal);color:#fff}
.btn-seal:hover{background:var(--seal-deep);border-color:var(--seal-deep)}
.btn-sm{min-height:38px;padding:8px 14px;font-size:.9rem}
.btn .arrow{transition:transform .2s}
.btn:hover .arrow{transform:translateX(4px)}
.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;background:var(--card);border:1px solid var(--line);font-size:.8rem;font-weight:700;color:var(--ink-2);white-space:nowrap}
.chip-seal{background:var(--seal-wash);border-color:transparent;color:var(--seal-deep)}
.chip-indigo{background:var(--indigo-wash);border-color:transparent;color:var(--indigo)}
.chip-moss{background:var(--moss-wash);border-color:transparent;color:var(--moss)}

/* ---------- breadcrumbs ---------- */
.crumbs{font-size:.88rem;color:var(--ink-3);margin:22px 0 0}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.crumbs li+li::before{content:"/";margin-right:6px;color:var(--line)}
.crumbs a{color:var(--ink-2);text-decoration:none}
.crumbs a:hover{color:var(--seal);text-decoration:underline}

/* ---------- seal stamp (signature) ---------- */
.seal{--s:96px;position:relative;width:var(--s);height:var(--s);border-radius:50%;color:var(--seal);display:grid;place-items:center;flex:none;border:3px solid currentColor;transform:rotate(-12deg);background:color-mix(in srgb,currentColor 5%,transparent)}
.seal::before{content:"";position:absolute;inset:23%;border:2px solid currentColor;border-radius:50%}
.seal::after{content:"";position:absolute;inset:-3px;border-radius:50%;background:repeating-radial-gradient(circle at 70% 60%,transparent 0 3px,color-mix(in srgb,var(--card) 35%,transparent) 3px 4px);opacity:.45;pointer-events:none}
.seal-ring{position:absolute;inset:0}
.seal-ring span{position:absolute;left:50%;top:4%;height:46%;transform-origin:bottom center;font:800 calc(var(--s)*.095)/1 var(--f-body);letter-spacing:0;text-transform:uppercase}
.seal-core{font:800 calc(var(--s)*.2)/.9 var(--f-display);text-align:center;letter-spacing:-.03em}
.seal-core small{display:block;font:700 calc(var(--s)*.085)/1.1 var(--f-body);letter-spacing:.08em;margin-top:2px}
.seal.moss{color:var(--moss)}
.seal.rust{color:var(--rust)}
@keyframes stamp{0%{opacity:0;transform:rotate(-30deg) scale(1.9)}55%{opacity:1;transform:rotate(-10deg) scale(.92)}75%{transform:rotate(-13deg) scale(1.04)}100%{opacity:1;transform:rotate(-12deg) scale(1)}}
.stamp-in{animation:stamp .55s cubic-bezier(.2,.9,.25,1.2) both}

/* ---------- home hero ---------- */
.hero{padding:56px 0 40px;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero h1 em{font-style:italic;color:var(--seal);font-variation-settings:"SOFT" 100,"WONK" 1,"opsz" 144}
.hero .lede{margin:18px 0 28px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.hero-proof{margin-top:26px;display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--ink-3);font-size:.92rem}
.hero-proof b{color:var(--ink)}
.deck{position:relative;height:430px;perspective:1200px}
@media (min-width:921px){.deck::before{content:"";position:absolute;inset:-20px -90px -40px -10px;background:url("../../media/covers/home.webp") 30% 60%/cover no-repeat;opacity:.9;border-radius:28px;-webkit-mask-image:radial-gradient(ellipse 70% 65% at 40% 55%,#000 55%,transparent 80%);mask-image:radial-gradient(ellipse 70% 65% at 40% 55%,#000 55%,transparent 80%)}}
.deck-card{position:absolute;inset:auto;width:min(360px,92%);left:50%;top:50%;background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-lg);padding:22px 22px 18px;transform-origin:50% 120%}
.deck-card:nth-child(1){transform:translate(-50%,-50%) rotate(-9deg) translateX(-34px);opacity:.7}
.deck-card:nth-child(2){transform:translate(-50%,-50%) rotate(5deg) translateX(30px);opacity:.88}
.deck-card:nth-child(3){transform:translate(-50%,-50%) rotate(-1.5deg);animation:float 7s ease-in-out infinite}
@keyframes float{0%,100%{transform:translate(-50%,-50%) rotate(-1.5deg)}50%{transform:translate(-50%,calc(-50% - 10px)) rotate(-.5deg)}}
.deck-card .tag{font:700 .72rem/1 var(--f-body);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3)}
.deck-card .qtext{font:600 1.08rem/1.4 var(--f-display);margin:12px 0 14px}
.deck-card .opt{display:flex;gap:10px;align-items:center;padding:9px 12px;border:1px solid var(--line);border-radius:10px;margin-top:8px;font-size:.92rem;background:var(--card-2)}
.deck-card .opt b{width:24px;height:24px;border-radius:7px;display:grid;place-items:center;background:var(--paper-2);font-size:.8rem}
.deck-card .opt.ok{border-color:var(--moss);background:var(--moss-wash)}
.deck-card .opt.ok b{background:var(--moss);color:#fff}
.deck-card .cite{margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);font-size:.8rem;color:var(--ink-3)}
.deck-card .seal{--s:80px;position:absolute;right:-30px;bottom:-44px}
.deck-card .cite{padding-right:34px}
@media (max-width:920px){.hero{grid-template-columns:1fr;gap:28px}.deck{height:auto;perspective:none}.deck-card:nth-child(1),.deck-card:nth-child(2){display:none}.deck-card:nth-child(3){position:relative;left:auto;top:auto;transform:rotate(-1deg);animation:none;margin:0 auto 34px;width:min(420px,100%)}}

/* ---------- stats strip ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:0;background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);overflow:hidden}
.stat{padding:22px 24px;border-right:1px solid var(--line-2)}
.stat:last-child{border-right:0}
.stat b{display:block;font:800 clamp(1.8rem,1.3rem + 1.6vw,2.6rem)/1 var(--f-display);letter-spacing:-.03em;font-variation-settings:"SOFT" 50,"opsz" 144}
.stat span{display:block;margin-top:6px;color:var(--ink-3);font-size:.9rem}
@media (max-width:720px){.stats{grid-template-columns:1fr 1fr}.stat:nth-child(2){border-right:0}.stat:nth-child(-n+2){border-bottom:1px solid var(--line-2)}}

/* ---------- sections ---------- */
.section{margin-top:84px}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:26px;flex-wrap:wrap}
.section-head p{color:var(--ink-2);max-width:56ch;margin:0}

/* process steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:step}
.step{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px 22px 22px;box-shadow:var(--shadow);counter-increment:step;transition:transform .25s,box-shadow .25s}
.step:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.step::before{content:counter(step,decimal-leading-zero);font:800 2.6rem/1 var(--f-display);color:color-mix(in srgb,var(--seal) 22%,transparent);position:absolute;right:16px;top:12px;font-variation-settings:"opsz" 144}
.step h3{font-size:1.12rem;margin:30px 0 8px}
.step p{font-size:.95rem;color:var(--ink-2);margin:0}
.step .ico{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font:800 1.15rem/1 var(--f-display);color:#fff;background:var(--indigo)}
.step:nth-child(2) .ico{background:var(--seal)}
.step:nth-child(3) .ico{background:var(--moss)}
.step:nth-child(4) .ico{background:var(--gold)}
@media (max-width:900px){.steps{grid-template-columns:1fr 1fr}}
@media (max-width:540px){.steps{grid-template-columns:1fr}}

/* certification cards */
.cat-head{display:flex;align-items:baseline;gap:14px;margin:34px 0 14px;flex-wrap:wrap}
.cat-head h3{margin:0}
.cat-head p{margin:0;color:var(--ink-3);font-size:.95rem}
.cert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.cert-card{--hue:var(--indigo);position:relative;display:grid;grid-template-columns:96px 1fr;background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s,border-color .25s}
.cert-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--hue);color:var(--ink)}
.cert-card[data-cat=aviation]{--hue:#2f5d9e}.cert-card[data-cat=environment]{--hue:#2c7a4d}.cert-card[data-cat=cybersecurity]{--hue:#c43d2a}.cert-card[data-cat=cloud]{--hue:#b8862a}
.cert-spine{background:var(--hue);color:#fff;display:flex;flex-direction:column;justify-content:space-between;padding:16px 12px;position:relative;overflow:hidden}
.cert-spine::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(135deg,rgba(255,255,255,.08) 0 2px,transparent 2px 9px)}
.cert-mono{position:relative;z-index:1;font:800 1.9rem/.9 var(--f-display);letter-spacing:-.04em;font-variation-settings:"SOFT" 60,"WONK" 1,"opsz" 144;word-break:break-word}
.cert-issuer{position:relative;z-index:1;font:700 .68rem/1.2 var(--f-body);letter-spacing:.12em;text-transform:uppercase;opacity:.9}
.cert-body{padding:18px 18px 16px;display:flex;flex-direction:column;gap:8px}
.cert-body h4{font-size:1.15rem;margin:0}
.cert-body p{font-size:.92rem;color:var(--ink-2);margin:0}
.cert-meta{margin-top:auto;display:flex;flex-wrap:wrap;gap:6px;padding-top:8px}
.cert-go{font-weight:700;color:var(--hue);font-size:.92rem}

/* ---------- cert page ---------- */
.cert-hero{display:grid;grid-template-columns:auto 1fr;gap:28px;align-items:center;padding:34px 0 10px}
.cert-badge{--hue:var(--indigo);width:132px;height:160px;border-radius:16px;background:var(--hue);color:#fff;display:flex;flex-direction:column;justify-content:space-between;padding:16px;box-shadow:var(--shadow-lg);position:relative;overflow:hidden;transform:rotate(-3deg)}
.cert-badge::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(135deg,rgba(255,255,255,.09) 0 2px,transparent 2px 10px)}
.cert-badge b{position:relative;z-index:1;font:800 2.6rem/.9 var(--f-display);letter-spacing:-.04em;font-variation-settings:"SOFT" 60,"WONK" 1,"opsz" 144}
.cert-badge span{position:relative;z-index:1;font:700 .7rem/1.2 var(--f-body);letter-spacing:.12em;text-transform:uppercase}
.cert-badge[data-cat=aviation]{--hue:#2f5d9e}.cert-badge[data-cat=environment]{--hue:#2c7a4d}.cert-badge[data-cat=cybersecurity]{--hue:#c43d2a}.cert-badge[data-cat=cloud]{--hue:#b8862a}
.cert-hero .lede{margin:8px 0 0}
.cert-hero.has-cover{grid-template-columns:auto 1fr minmax(260px,380px)}
.cert-cover{margin:0;position:relative;transform:rotate(1.5deg)}
.cert-cover img{width:100%;height:auto;border-radius:14px;border:8px solid #fff;box-shadow:var(--shadow-lg)}
.cert-cover::after{content:"";position:absolute;left:50%;top:-12px;width:90px;height:24px;transform:translateX(-50%) rotate(-3deg);background:color-mix(in srgb,var(--gold) 35%,#fff);opacity:.8;box-shadow:0 1px 2px rgba(0,0,0,.08)}
@media (max-width:1000px){.cert-hero.has-cover{grid-template-columns:auto 1fr}.cert-cover{grid-column:1/-1;max-width:520px}}
.updated{display:block;font-size:.88rem;color:var(--ink-3);margin-top:14px}
.updated::before{content:"";display:inline-block;vertical-align:middle;margin:-2px 10px 0 4px;width:8px;height:8px;border-radius:50%;background:var(--moss);box-shadow:0 0 0 4px var(--moss-wash)}
@media (max-width:640px){.cert-hero{grid-template-columns:1fr}.cert-badge{width:100px;height:120px}.cert-badge b{font-size:2rem}}

.layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:40px;align-items:start;margin-top:34px}
@media (max-width:1000px){.layout{grid-template-columns:minmax(0,1fr)}}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:22px}
.panel h2,.panel h3{margin-top:0}
.sticky{position:sticky;top:88px}
.layout>.side{align-self:stretch}

/* fact sheet */
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(140px,100%),1fr));gap:0;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--card);box-shadow:var(--shadow)}
.fact{padding:18px 18px 16px;border-right:1px solid var(--line-2);border-bottom:1px solid var(--line-2);position:relative}
.fact dt{font:700 .72rem/1.2 var(--f-body);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3)}
.fact dd{margin:8px 0 0;font:750 1.6rem/1.05 var(--f-display);letter-spacing:-.02em;font-variation-settings:"opsz" 144}
.fact dd small{font:600 .85rem/1.3 var(--f-body);color:var(--ink-2);display:block;margin-top:4px;letter-spacing:0}
.fact .src{position:absolute;right:10px;top:10px;font-size:.72rem;font-weight:700;text-decoration:none;background:var(--indigo-wash);color:var(--indigo);border-radius:999px;padding:2px 8px}
.fact .src:hover{background:var(--indigo);color:#fff}

/* outline table */
.outline{width:100%;border-collapse:separate;border-spacing:0;background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);font-size:.97rem}
.outline th,.outline td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line-2);vertical-align:middle}
.outline thead th{background:var(--paper-2);font:700 .74rem/1 var(--f-body);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3)}
.outline tr:last-child td{border-bottom:0}
.outline .code{font:800 1.1rem/1 var(--f-display);color:var(--seal);width:56px}
.wbar{display:flex;align-items:center;gap:10px;min-width:150px}
.wbar i{flex:1;height:8px;border-radius:99px;background:var(--paper-2);overflow:hidden;position:relative}
.wbar i::after{content:"";position:absolute;inset:0 auto 0 0;width:var(--w,0%);background:linear-gradient(90deg,var(--indigo),var(--indigo-2));border-radius:99px}
.wbar span{font-weight:700;font-size:.9rem;white-space:nowrap}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--r)}

/* chapter list */
.chapters{display:grid;gap:14px;counter-reset:ch}
.ch-card{display:grid;grid-template-columns:64px 1fr auto;gap:18px;align-items:center;padding:18px 20px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .2s,border-color .2s,box-shadow .2s}
.ch-card:hover{transform:translateX(4px);border-color:var(--seal);box-shadow:var(--shadow-lg);color:var(--ink)}
.ch-num{font:800 2.1rem/1 var(--f-display);color:color-mix(in srgb,var(--seal) 80%,var(--ink));font-variation-settings:"opsz" 144;text-align:center}
.ch-card h3{margin:0 0 4px;font-size:1.15rem}
.ch-card p{margin:0;color:var(--ink-2);font-size:.93rem}
.ch-side{display:flex;flex-direction:column;align-items:end;gap:8px;min-width:120px}
@media (max-width:600px){.ch-card{grid-template-columns:44px 1fr}.ch-side{grid-column:1/-1;flex-direction:row;align-items:center;justify-content:space-between}}

/* belt */
.belt{--belt:#f4f1ea;--edge:#cfc7b6;display:inline-flex;align-items:center;gap:8px;font-size:.78rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-2)}
.belt i{position:relative;width:64px;height:12px;border-radius:3px;background:var(--belt);box-shadow:inset 0 0 0 1px var(--edge),inset 0 -3px 0 rgba(0,0,0,.08)}
.belt i::before{content:"";position:absolute;left:24px;top:-4px;width:14px;height:20px;border-radius:3px;background:var(--belt);box-shadow:inset 0 0 0 1px var(--edge),0 1px 2px rgba(0,0,0,.2);transform:rotate(8deg)}
.belt i::after{content:"";position:absolute;left:30px;top:10px;width:5px;height:12px;background:var(--belt);box-shadow:inset 0 0 0 1px var(--edge);transform:rotate(-14deg);border-radius:1px}
.belt[data-rank="1"]{--belt:#f2d64b;--edge:#c6a91f}.belt[data-rank="2"]{--belt:#ee8a2e;--edge:#bd6513}.belt[data-rank="3"]{--belt:#3d9a5b;--edge:#2a7442}
.belt[data-rank="4"]{--belt:#2f62c4;--edge:#1f4796}.belt[data-rank="5"]{--belt:#7a4b2a;--edge:#5a351b}.belt[data-rank="6"]{--belt:#1d1b17;--edge:#000}
.ring{--p:0;width:120px;height:120px;border-radius:50%;background:conic-gradient(var(--moss) calc(var(--p)*1%),var(--paper-2) 0);display:grid;place-items:center;margin:0 auto;transition:--p .6s}
.ring>div{width:92px;height:92px;border-radius:50%;background:var(--card);display:grid;place-items:center;text-align:center;box-shadow:inset 0 0 0 1px var(--line-2)}
.ring b{font:800 1.6rem/1 var(--f-display)}
.ring small{display:block;color:var(--ink-3);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase}

/* ---------- chapter page / question card ---------- */
.ch-intro{font-size:1.05rem;color:var(--ink-2)}
.ch-intro p:last-child{margin-bottom:0}
.toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:26px 0 18px}
.seg{display:inline-flex;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:4px}
.seg button{border:0;background:transparent;color:var(--ink-2);font:700 .88rem/1 var(--f-body);padding:9px 14px;border-radius:999px;transition:background .2s,color .2s}
.seg button[aria-pressed=true]{background:var(--ink);color:var(--paper)}
.seg button:hover:not([aria-pressed=true]){background:var(--paper-2)}
.qs{display:grid;gap:30px}
.q{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);overflow:hidden;scroll-margin-top:90px}
.q::before{content:"";position:absolute;left:46px;top:0;bottom:0;width:1.5px;background:color-mix(in srgb,var(--seal) 45%,transparent)}
.q-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:12px 18px 12px 62px;border-bottom:1px solid var(--line-2);background:var(--card-2);font-size:.8rem;color:var(--ink-3)}
.q-head .form{font:800 .8rem/1 var(--f-body);letter-spacing:.14em;text-transform:uppercase;color:var(--seal)}
.q-head .qid{font-family:var(--f-mono);letter-spacing:.04em}
.q-head .q-tools{margin-left:auto;display:flex;gap:4px}
.icon-btn{border:1px solid transparent;background:transparent;color:var(--ink-3);border-radius:8px;min-height:34px;padding:4px 10px;font:700 .8rem/1 var(--f-body);display:inline-flex;align-items:center;gap:6px;transition:background .2s,color .2s,border-color .2s}
.icon-btn:hover{background:var(--card);border-color:var(--line);color:var(--ink)}
.icon-btn[aria-pressed=true]{color:var(--gold);}
.icon-btn .star{font-size:1rem;line-height:1}
.q-body{padding:22px 24px 8px 62px;background-image:repeating-linear-gradient(to bottom,transparent 0 31px,color-mix(in srgb,var(--indigo) 7%,transparent) 31px 32px);background-position:0 14px}
.q-text{font:600 1.18rem/1.5 var(--f-display);font-variation-settings:"SOFT" 30,"opsz" 32;margin:0 0 18px;white-space:pre-line}
.q-fig{margin:0 0 18px;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
.q-fig figcaption{font-size:.82rem;color:var(--ink-3);padding:8px 12px;border-top:1px solid var(--line-2);background:var(--card-2)}
.choices{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.choice{display:flex;align-items:flex-start;gap:14px;width:100%;text-align:left;border:1.5px solid var(--line);background:var(--card);color:var(--ink);border-radius:12px;padding:13px 16px;font:500 1.02rem/1.45 var(--f-body);transition:border-color .15s,background .15s,transform .1s,box-shadow .15s}
.choice:hover:not(:disabled){border-color:var(--indigo-2);background:var(--indigo-wash);box-shadow:0 4px 14px -8px var(--indigo)}
.choice:active:not(:disabled){transform:scale(.995)}
.choice .key{flex:none;width:30px;height:30px;border-radius:8px;display:grid;place-items:center;background:var(--paper-2);font:800 .9rem/1 var(--f-body);color:var(--ink-2);transition:background .15s,color .15s}
.choice[aria-pressed=true]{border-color:var(--indigo);background:var(--indigo-wash)}
.choice[aria-pressed=true] .key{background:var(--indigo);color:#fff}
.choice:disabled{cursor:default}
.choice.is-correct{border-color:var(--moss);background:var(--moss-wash)}
.choice.is-correct .key{background:var(--moss);color:#fff}
.choice.is-wrong{border-color:var(--rust);background:var(--rust-wash)}
.choice.is-wrong .key{background:var(--rust);color:#fff}
.choice.is-dim{opacity:.6}
.tf{grid-template-columns:1fr 1fr}
.tf .choice{justify-content:center;font-weight:800;font-size:1.05rem}
.check-row{display:flex;align-items:center;gap:12px;margin-top:12px}
.q-foot{padding:14px 24px 22px 62px}
.answer{border-top:1px dashed var(--line);margin-top:6px}
.answer>summary{list-style:none;display:inline-flex;align-items:center;gap:8px;margin-top:14px;font:700 .9rem/1 var(--f-body);color:var(--ink-3);padding:8px 12px;border-radius:8px;border:1px solid var(--line)}
.answer>summary::-webkit-details-marker{display:none}
.answer>summary:hover{color:var(--ink);border-color:var(--ink-3)}
.answer[open]>summary{display:none}
.verdict{display:flex;align-items:center;gap:16px;margin:18px 0 6px}
.verdict .seal{--s:78px}
.verdict h3{margin:0;font-size:1.25rem}
.verdict p{margin:2px 0 0;color:var(--ink-2)}
.verdict.neutral h3{color:var(--ink)}
.explain{margin-top:12px;font-size:1.01rem}
.explain p{margin-bottom:.8em}
.correct-line{display:flex;gap:10px;align-items:baseline;background:var(--moss-wash);border-left:4px solid var(--moss);padding:10px 14px;border-radius:0 10px 10px 0;margin:12px 0 14px;font-weight:600}
.correct-line b{color:var(--moss);font:800 .74rem/1 var(--f-body);letter-spacing:.12em;text-transform:uppercase;white-space:nowrap}
.sources{margin-top:18px;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:16px 16px 6px;position:relative}
.sources h4{font:800 .78rem/1 var(--f-body);letter-spacing:.16em;text-transform:uppercase;color:var(--seal);margin:0 0 12px;display:flex;align-items:center;gap:8px}
.sources h4::before{content:"";width:18px;height:18px;border-radius:50%;box-shadow:inset 0 0 0 2px var(--seal),inset 0 0 0 4px var(--paper),inset 0 0 0 5px var(--seal)}
.sources ol{margin:0;padding:0;list-style:none;display:grid;gap:10px;counter-reset:src}
.src-item{counter-increment:src;display:grid;grid-template-columns:28px 1fr;gap:10px;padding-bottom:10px;border-bottom:1px solid var(--line-2)}
.src-item:last-child{border-bottom:0}
.src-item::before{content:counter(src);width:24px;height:24px;border-radius:6px;background:var(--ink);color:var(--paper);font:800 .78rem/24px var(--f-body);text-align:center}
.src-title{font-weight:700;line-height:1.35}
.src-title a{color:var(--ink);text-decoration-color:var(--line)}
.src-title a:hover{color:var(--seal)}
.src-meta{font-size:.82rem;color:var(--ink-3);margin-top:2px}
.src-quote{margin:8px 0 2px;padding:10px 12px;background:var(--card);border-left:3px solid var(--gold);border-radius:0 8px 8px 0;font:400 .9rem/1.55 var(--f-mono);color:var(--ink-2)}
.sources .seal{--s:70px;position:absolute;right:-8px;top:-26px}
.q.answered.right{border-color:color-mix(in srgb,var(--moss) 45%,var(--line))}
.q.answered.wrong{border-color:color-mix(in srgb,var(--rust) 40%,var(--line))}
.q[hidden]{display:none}
@media (max-width:600px){
  .q::before{left:18px}
  .q-head{padding:10px 12px 10px 30px}
  .q-body{padding:18px 16px 6px 30px}
  .q-foot{padding:12px 16px 18px 30px}
  .q-text{font-size:1.08rem}
  .choice{padding:12px 12px}
  .sources .seal{display:none}
}
.ch-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:40px}
.ch-nav a{display:block;padding:18px 20px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:border-color .2s,transform .2s}
.ch-nav a:hover{border-color:var(--seal);transform:translateY(-2px);color:var(--ink)}
.ch-nav small{display:block;color:var(--ink-3);font-weight:700;letter-spacing:.08em;text-transform:uppercase;font-size:.72rem;margin-bottom:6px}
.ch-nav .next{text-align:right;grid-column:2}
.side-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:16px 0;text-align:center}
.side-stats div{background:var(--paper);border-radius:10px;padding:10px 4px}
.side-stats b{display:block;font:800 1.3rem/1 var(--f-display)}
.side-stats span{font-size:.72rem;color:var(--ink-3);text-transform:uppercase;letter-spacing:.06em;font-weight:700}
.mobile-progress{display:none}
@media (max-width:1000px){
  .side .sticky{position:static}
  .mobile-progress{display:flex;position:sticky;top:68px;z-index:30;align-items:center;gap:12px;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);padding:10px 0;border-bottom:1px solid var(--line-2);margin:0 -20px;padding-inline:20px}
  .mobile-progress .bar{flex:1;height:8px;background:var(--paper-2);border-radius:99px;overflow:hidden}
  .mobile-progress .bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--moss),#56b07c);transition:width .5s}
  .mobile-progress span{font-size:.85rem;font-weight:700;white-space:nowrap}
}

/* ---------- prose pages ---------- */
.prose{max-width:var(--read)}
.prose h2{margin-top:1.8em}
.prose h3{margin-top:1.4em}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin:.35em 0}
.prose table{width:100%;border-collapse:collapse;margin:1em 0;font-size:.95rem}
.prose th,.prose td{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left;vertical-align:top}
.prose th{font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3)}
.callout{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--seal);border-radius:0 var(--r) var(--r) 0;padding:16px 18px;margin:1.4em 0}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:10px;box-shadow:var(--shadow)}
.faq summary{list-style:none;padding:16px 48px 16px 18px;font:650 1.05rem/1.35 var(--f-display);position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:18px;top:50%;transform:translateY(-50%);font:700 1.4rem/1 var(--f-body);color:var(--seal);transition:transform .2s}
.faq details[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq .faq-a{padding:0 18px 16px;color:var(--ink-2)}
.faq .faq-src{font-size:.82rem;color:var(--ink-3)}

/* updates timeline */
.timeline{list-style:none;margin:0;padding:0;position:relative}
.timeline::before{content:"";position:absolute;left:9px;top:6px;bottom:6px;width:2px;background:var(--line)}
.timeline li{position:relative;padding:0 0 22px 36px}
.timeline li::before{content:"";position:absolute;left:2px;top:6px;width:16px;height:16px;border-radius:50%;background:var(--card);box-shadow:inset 0 0 0 3px var(--k,var(--indigo))}
.timeline li[data-kind=answer_corrected]{--k:var(--rust)}.timeline li[data-kind=explanation_corrected]{--k:var(--gold)}.timeline li[data-kind=added]{--k:var(--moss)}.timeline li[data-kind=removed]{--k:var(--ink-3)}
.timeline time{font-weight:800;font-size:.85rem;color:var(--ink-3)}
.timeline p{margin:4px 0 0}

/* forms */
.form{display:grid;gap:16px;max-width:560px}
.field label{display:block;font-weight:700;margin-bottom:6px}
.field .hint{font-size:.85rem;color:var(--ink-3);margin-top:4px}
.input,select.input,textarea.input{width:100%;font:inherit;color:var(--ink);background:var(--card);border:1.5px solid var(--line);border-radius:10px;padding:12px 14px;min-height:48px;transition:border-color .15s,box-shadow .15s}
.input:focus{outline:0;border-color:var(--indigo-2);box-shadow:0 0 0 4px color-mix(in srgb,var(--indigo-2) 18%,transparent)}
textarea.input{min-height:150px;resize:vertical}
.check{display:flex;gap:10px;align-items:flex-start;font-size:.95rem}
.check input{width:20px;height:20px;margin-top:2px;accent-color:var(--seal)}
.error{color:var(--rust);font-size:.88rem;font-weight:700;margin-top:6px}
.notice{background:var(--moss-wash);border:1px solid color-mix(in srgb,var(--moss) 35%,transparent);color:var(--ink);padding:12px 16px;border-radius:10px}
.hp{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}
.auth-card{max-width:480px;margin:40px auto 0}

/* dialog */
dialog{border:1px solid var(--line);border-radius:18px;background:var(--card);color:var(--ink);padding:0;width:min(560px,calc(100vw - 32px));box-shadow:var(--shadow-lg)}
dialog::backdrop{background:rgba(20,16,10,.5);backdrop-filter:blur(3px)}
.dlg-head{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;border-bottom:1px solid var(--line-2)}
.dlg-head h2{font-size:1.25rem;margin:0}
.dlg-body{padding:18px 20px 22px}
.radio-list{display:grid;gap:8px}
.radio-list label{display:flex;gap:10px;align-items:center;border:1.5px solid var(--line);border-radius:10px;padding:10px 12px}
.radio-list label:has(input:checked){border-color:var(--indigo);background:var(--indigo-wash)}
.radio-list input{accent-color:var(--indigo)}

/* exam */
.exam-shell{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start}
@media (max-width:1000px){.exam-shell{grid-template-columns:minmax(0,1fr)}}
.exam-clock{font:800 2rem/1 var(--f-display);font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.exam-clock.low{color:var(--rust)}
.qgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px;margin-top:14px}
.qgrid button{height:38px;border-radius:8px;border:1.5px solid var(--line);background:var(--card);font:700 .85rem/1 var(--f-body);color:var(--ink-2)}
.qgrid button.done{background:var(--indigo-wash);border-color:var(--indigo-2);color:var(--indigo)}
.qgrid button.flag{box-shadow:inset 0 -4px 0 var(--gold)}
.qgrid button.cur{border-color:var(--ink);color:var(--ink)}
.qgrid button.ok{background:var(--moss-wash);border-color:var(--moss);color:var(--moss)}
.qgrid button.ng{background:var(--rust-wash);border-color:var(--rust);color:var(--rust)}
.result-hero{display:flex;gap:24px;align-items:center;flex-wrap:wrap}
.result-score{font:800 clamp(3rem,2rem + 4vw,5rem)/1 var(--f-display);letter-spacing:-.04em}
.unit-bars{display:grid;gap:12px;margin-top:18px}
.unit-bars .wbar i::after{background:linear-gradient(90deg,var(--moss),#56b07c)}

/* misc */
.empty{padding:28px;text-align:center;color:var(--ink-3);border:1.5px dashed var(--line);border-radius:var(--r)}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(calc(100% + 40px));visibility:hidden;background:var(--ink);color:var(--paper);padding:12px 18px;border-radius:12px;font-weight:700;z-index:80;transition:transform .35s cubic-bezier(.2,.9,.25,1.2);box-shadow:var(--shadow-lg);max-width:calc(100vw - 32px)}
.toast.show{transform:translateX(-50%) translateY(0);visibility:visible}
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media (max-width:720px){.grid-2{grid-template-columns:1fr}}
.kbd{font:700 .78rem/1 var(--f-mono);border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:2px 6px;background:var(--card)}
.unofficial{font-size:.85rem;color:var(--ink-3);border:1px solid var(--line);border-radius:10px;padding:10px 14px;background:var(--card-2);margin-top:18px}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}
@media print{.site-header,.site-footer,.toolbar,.q-tools,.side,.mobile-progress{display:none!important}.answer{display:block}.q{break-inside:avoid;box-shadow:none}}