/* Vectis Learning — shared styles. One light look on purpose: navy bands and gold accents, same for every visitor.
   Layout: navy header and hero bands frame left-aligned pages on a cool white ground; gold is the accent (rules, figures, the demand curve), navy carries the weight. */
:root{
  --paper:#F6F7F9; --surface:#FFFFFF; --ink:#0F1E3A; --muted:#5A6478; --line:#DCE1EA;
  --accent:#14284B; --accent-ink:#1D3D73; --on-accent:#FFFFFF; --demand:#B8862B; --soft:#EBEFF6;
  --supply:#1D3D73; --gold:#B8862B; --gold-bright:#D2A24C; --band:#0F1E3A; --band-2:#16294D; --band-ink:#F4F1E8; --band-muted:#AEB8CC;
  --good:#1E7A47; --good-soft:#E3F2E9; --bad:#B53A2A; --bad-soft:#FBE9E6;
  --display:"Spectral", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --body:"Source Sans 3", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --mono:"Source Sans 3", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --mark:"Montserrat", "Source Sans 3", Arial, sans-serif;
  --wrap:1120px; --r:8px;
}
:root{color-scheme:light}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:1.0625rem;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%}
a{color:var(--accent-ink)}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
h1,h2,h3,h4{font-family:var(--display);line-height:1.08;text-wrap:balance;margin:0;letter-spacing:-0.01em}
p{margin:0}
[hidden]{display:none!important}
.wrap{max-width:var(--wrap);margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.label{font-family:var(--mono);font-size:.75rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;font-family:var(--display);font-weight:600;font-size:1rem;padding:.8em 1.25em;border-radius:999px;text-decoration:none;border:1.5px solid var(--accent);background:var(--accent);color:var(--on-accent);cursor:pointer;transition:transform .15s ease,background .15s}
.btn:hover{transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--accent-ink)}
.btn.ghost:hover{background:var(--soft)}
.btn.small{font-size:.9rem;padding:.55em 1em}
.btn[disabled]{opacity:.45;cursor:not-allowed;transform:none}
.pill{display:inline-block;font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;text-transform:uppercase;padding:3px 8px;border-radius:999px;border:1px solid var(--line);color:var(--muted)}
.pill.free{border-color:var(--accent);color:var(--accent-ink)}

/* Header / footer */
header.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:14px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:var(--display);font-weight:800;font-size:1.2rem;letter-spacing:-.02em}
.brand svg{width:34px;height:22px;flex:none}
.nav ul{display:flex;gap:22px;list-style:none;margin:0;padding:0;font-family:var(--display);font-size:.95rem}
.nav ul a{color:var(--ink);text-decoration:none;opacity:.8}
.nav ul a:hover,.nav ul a[aria-current]{opacity:1;color:var(--accent-ink)}
@media (max-width:760px){.nav ul{display:none}}
footer{border-top:1px solid var(--line);padding-block:32px 40px;margin-top:72px;font-size:.92rem;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;gap:16px 32px;justify-content:space-between;align-items:center}
footer ul{display:flex;flex-wrap:wrap;gap:8px 20px;list-style:none;margin:0;padding:0}
footer a{color:var(--muted)}

/* Home: hero */
.hero{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center;padding-block:64px 56px}
.hero>*{min-width:0}
.hero h1{font-size:clamp(2.4rem,5.6vw,4.4rem);font-weight:800;letter-spacing:-.035em;margin-top:14px}
.hero h1 em{font-style:normal;color:var(--accent-ink)}
.hero .lede{margin-top:20px;font-size:1.2rem;max-width:34ch;color:var(--muted)}
.hero .ctas{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero .creds{margin-top:28px;display:flex;flex-wrap:wrap;gap:8px 20px}
@media (max-width:860px){.hero{grid-template-columns:1fr;gap:32px;padding-block:40px}}
.graph{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px 18px 16px;margin:0}
.graph-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.graph-head h2{font-size:1.05rem;font-weight:600}
.graph svg{display:block;width:100%;height:auto;margin-top:8px}
.graph svg text{font-family:var(--mono);font-size:11px;fill:var(--muted)}
.graph svg .tag{font-weight:500;font-size:12px}
.graph .ctrl{display:flex;align-items:center;gap:12px;margin-top:6px}
.graph .ctrl label{font-family:var(--display);font-size:.9rem;white-space:nowrap}
.graph input[type=range]{flex:1;min-width:0;accent-color:var(--demand)}
.readout{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}
.readout div{background:var(--soft);border-radius:8px;padding:8px 12px}
.readout b{display:block;font-family:var(--display);font-size:1.35rem;font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.graph .src{margin-top:10px;font-size:.85rem;color:var(--muted)}

/* Sections */
section.band{padding-block:72px;border-top:1px solid var(--line)}
.sec-head{display:grid;grid-template-columns:240px 1fr;gap:32px;margin-bottom:36px}
.sec-head>*{min-width:0}
.sec-head h2{font-size:clamp(1.8rem,3.6vw,2.6rem);font-weight:800;letter-spacing:-.025em}
.sec-head p{margin-top:12px;color:var(--muted);max-width:60ch}
@media (max-width:760px){.sec-head{grid-template-columns:1fr;gap:8px}section.band{padding-block:52px}}

/* Course cards (home) */
.courses{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.course{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px;display:flex;flex-direction:column;gap:14px;min-width:0}
.course .meta{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center}
.course h3{font-size:1.6rem;font-weight:800;letter-spacing:-.025em}
.course .desc{color:var(--muted);font-size:1rem}
.stats{display:flex;gap:24px;font-variant-numeric:tabular-nums;flex-wrap:wrap}
.stats b{font-family:var(--display);font-size:1.5rem;display:block;line-height:1}
.stats span{font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.course .actions{margin-top:auto;display:flex;flex-wrap:wrap;gap:10px;padding-top:4px}
@media (max-width:980px){.courses{grid-template-columns:1fr 1fr}}
@media (max-width:680px){.courses{grid-template-columns:1fr}}

/* Cheat sheets */
.sheets{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.sheet{display:grid;grid-template-columns:120px 1fr;gap:20px;align-items:start;min-width:0}
.sheet>div{min-width:0;display:flex;flex-direction:column;gap:10px}
.a4{aspect-ratio:1/1.414;max-width:100%;background:var(--surface);border:1px solid var(--line);border-radius:4px;padding:10px;display:grid;grid-template-columns:1fr 1fr;gap:6px;box-shadow:6px 6px 0 var(--soft)}
.a4 i{display:block;height:4px;border-radius:2px;background:var(--line)}
.a4 i.h{background:var(--accent);opacity:.7;height:6px;grid-column:1/-1;width:60%}
.a4 i.box{height:22px;background:var(--soft);border:1px solid var(--line)}
.sheet h3{font-size:1.3rem;font-weight:600}
.sheet p{color:var(--muted);font-size:.98rem}
.sheet ul{margin:0;padding-left:1.1em;color:var(--muted);font-size:.95rem}
@media (max-width:860px){.sheets{grid-template-columns:1fr}}
@media (max-width:420px){.sheet{grid-template-columns:84px 1fr;gap:14px}}

/* Tutoring */
.tutor{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.slot{border:1.5px solid var(--line);border-radius:14px;padding:28px;display:flex;flex-direction:column;gap:12px;background:var(--surface);min-width:0}
.slot.main{border-color:var(--accent)}
.slot .dur{font-family:var(--display);font-weight:800;font-size:3rem;line-height:1;letter-spacing:-.04em;font-variant-numeric:tabular-nums}
.slot .dur small{font-size:1rem;font-weight:600;letter-spacing:0;color:var(--muted);margin-left:6px}
.slot p{color:var(--muted)}
.slot .btn{align-self:flex-start;margin-top:auto}
@media (max-width:760px){.tutor{grid-template-columns:1fr}}

/* About */
.about{display:grid;grid-template-columns:240px 1fr;gap:32px}
.about>*{min-width:0}
.mono-badge{width:120px;height:120px;border-radius:50%;background:var(--soft);border:1px solid var(--line);display:grid;place-items:center;font-family:var(--display);font-weight:800;font-size:2.4rem;color:var(--accent-ink);letter-spacing:-.04em;margin-top:16px}
.about .body{max-width:62ch;display:flex;flex-direction:column;gap:16px;font-size:1.1rem}
.about h2{font-size:clamp(1.8rem,3.6vw,2.6rem);font-weight:800;letter-spacing:-.025em}
.about dl{display:grid;grid-template-columns:auto 1fr;gap:6px 20px;margin:8px 0 0;font-size:.98rem}
.about dt{font-family:var(--mono);font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding-top:3px}
.about dd{margin:0}
@media (max-width:760px){.about{grid-template-columns:1fr;gap:20px}}

/* Newsletter */
.news{background:var(--ink);color:var(--paper);border-radius:16px;padding:40px;display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center;margin-top:72px}
.news>*{min-width:0}
.news h2{font-size:clamp(1.6rem,3vw,2.2rem);font-weight:800;letter-spacing:-.025em}
.news p{margin-top:10px;opacity:.75}
.news form{display:flex;flex-direction:column;gap:10px}
.news .row{display:flex;gap:8px;flex-wrap:wrap}
.news input[type=email]{flex:1;min-width:0;font:inherit;font-size:1rem;padding:.8em 1em;border-radius:999px;border:1.5px solid color-mix(in srgb,var(--paper) 30%,transparent);background:transparent;color:var(--paper)}
.news input[type=email]::placeholder{color:color-mix(in srgb,var(--paper) 55%,transparent)}
.news .consent{display:flex;gap:10px;align-items:flex-start;font-size:.88rem;opacity:.8}
.news .consent input{margin-top:4px;accent-color:var(--accent)}
.news .msg{font-family:var(--display);font-size:.95rem;min-height:1.4em;color:var(--accent)}
.sr{position:absolute;left:-9999px}
@media (max-width:760px){.news{grid-template-columns:1fr;padding:28px 22px}}

/* Course page */
.crumbs{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-family:var(--mono);font-size:.78rem;color:var(--muted);padding-block:28px 0}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--accent-ink)}
.page-head{padding-block:20px 40px;display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:end}
.page-head>*{min-width:0}
.page-head h1{font-size:clamp(2.2rem,5vw,3.8rem);font-weight:800;letter-spacing:-.035em;margin-top:10px}
.page-head .lede{margin-top:16px;color:var(--muted);font-size:1.12rem;max-width:58ch}
.page-head aside{display:flex;flex-direction:column;gap:16px;align-items:flex-start}
@media (max-width:860px){.page-head{grid-template-columns:1fr;gap:24px}}

.modules{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.modules li{border-bottom:1px solid var(--line)}
.modules a.mod{display:grid;grid-template-columns:3.2em 1fr auto;gap:16px;align-items:center;padding:18px 4px;text-decoration:none;color:var(--ink)}
.modules a.mod:hover{background:var(--soft)}
.modules a.mod:hover h3{color:var(--accent-ink)}
.modules .num{font-family:var(--mono);font-size:.9rem;color:var(--muted);font-variant-numeric:tabular-nums}
.modules h3{font-size:1.25rem;font-weight:600;transition:color .15s}
.modules .sub{display:block;font-family:var(--mono);font-size:.75rem;letter-spacing:.04em;color:var(--muted);margin-top:4px}
.modules .go{font-family:var(--display);font-weight:600;color:var(--accent-ink);white-space:nowrap}
.modules .done{color:var(--good)}
@media (max-width:560px){.modules a.mod{grid-template-columns:2.4em 1fr}.modules .go{display:none}}
.side-note{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:48px}
.side-note>div{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px;display:flex;flex-direction:column;gap:10px;min-width:0}
.side-note h3{font-size:1.25rem;font-weight:600}
.side-note p{color:var(--muted);font-size:1rem}
.side-note .btn{align-self:flex-start;margin-top:6px}
@media (max-width:760px){.side-note{grid-template-columns:1fr}}

/* Module page */
.notes{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.notes-bar{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--line)}
.notes-bar h2{font-size:1.15rem;font-weight:600}
.notes-bar .acts{display:flex;gap:8px;flex-wrap:wrap}
.notes iframe{display:block;width:100%;height:min(82vh,1100px);border:0;background:var(--soft)}
.notes .mobile-only{display:none;padding:20px;color:var(--muted)}
@media (max-width:760px){.notes iframe{display:none}.notes .mobile-only{display:block}}
.extra-files{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--line)}
.extra-files a{display:flex;justify-content:space-between;gap:12px;padding:14px 20px;text-decoration:none;color:var(--ink);border-bottom:1px solid var(--line)}
.extra-files a:last-child{border-bottom:0}
.extra-files a:hover{background:var(--soft)}
.extra-files .label{white-space:nowrap}

.module-section{margin-top:56px}
.module-section>h2{font-size:clamp(1.6rem,3vw,2.2rem);font-weight:800;letter-spacing:-.025em}
.module-section>p.intro{color:var(--muted);margin-top:8px;max-width:62ch}

/* Quiz */
.levels{display:flex;gap:8px;flex-wrap:wrap;margin-top:20px}
.levels button{font-family:var(--display);font-weight:600;font-size:.95rem;padding:.55em 1.1em;border-radius:999px;border:1.5px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;display:inline-flex;gap:.5em;align-items:center}
.levels button[aria-selected="true"]{border-color:var(--ink);background:var(--ink);color:var(--paper)}
.levels button .n{font-family:var(--mono);font-size:.75rem;opacity:.7}
.quiz{margin-top:20px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:28px}
.quiz-top{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.progress{display:flex;gap:4px;flex-wrap:wrap}
.progress i{width:18px;height:6px;border-radius:3px;background:var(--line)}
.progress i.cur{background:var(--ink)}
.progress i.ok{background:var(--good)}
.progress i.no{background:var(--bad)}
.qtext{font-size:1.2rem;margin-top:18px;max-width:64ch;white-space:pre-line}
.qtable{overflow-x:auto;margin-top:14px}
.qtable table{border-collapse:collapse;font-family:var(--mono);font-size:.88rem;font-variant-numeric:tabular-nums}
.qtable td,.qtable th{border:1px solid var(--line);padding:6px 12px;text-align:left;vertical-align:top}
.qtable tr:first-child td{background:var(--soft);font-weight:500}
.opts{list-style:none;margin:20px 0 0;padding:0;display:flex;flex-direction:column;gap:10px}
.opts button{width:100%;text-align:left;display:grid;grid-template-columns:2em 1fr auto;gap:10px;align-items:start;font:inherit;font-size:1rem;line-height:1.45;padding:12px 14px;border-radius:10px;border:1.5px solid var(--line);background:var(--paper);color:var(--ink);cursor:pointer}
.opts button:hover:not([disabled]){border-color:var(--accent)}
.opts button .k{font-family:var(--mono);font-size:.85rem;color:var(--muted);padding-top:1px}
.opts button .mark{font-family:var(--display);font-weight:600;font-size:.9rem;white-space:nowrap}
.opts button[disabled]{cursor:default}
.opts button.picked-ok{border-color:var(--good);background:var(--good-soft)}
.opts button.picked-ok .mark{color:var(--good)}
.opts button.picked-no{border-color:var(--bad);background:var(--bad-soft)}
.opts button.picked-no .mark{color:var(--bad)}
.feedback{margin-top:16px;font-family:var(--display);font-weight:600;font-size:1.05rem;min-height:1.5em}
.feedback.ok{color:var(--good)}
.feedback.no{color:var(--bad)}
.quiz-nav{display:flex;justify-content:flex-end;gap:10px;margin-top:16px}
.score{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap}
.score b{font-family:var(--display);font-size:clamp(3rem,8vw,4.5rem);font-weight:800;letter-spacing:-.04em;line-height:1;font-variant-numeric:tabular-nums}
.score span{color:var(--muted)}
.review{list-style:none;margin:24px 0 0;padding:0;display:flex;flex-direction:column;gap:0;border-top:1px solid var(--line)}
.review li{padding:18px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:2.4em 1fr;gap:12px}
.review li>*{min-width:0}
.review .badge{width:2em;height:2em;border-radius:50%;display:grid;place-items:center;font-family:var(--display);font-weight:800;font-size:.9rem}
.review .badge.ok{background:var(--good-soft);color:var(--good)}
.review .badge.no{background:var(--bad-soft);color:var(--bad)}
.review .rq{font-weight:600;white-space:pre-line}
.review .ra{margin-top:8px;display:flex;flex-direction:column;gap:4px;font-size:.98rem}
.review .ra .yours{color:var(--bad)}
.review .ra .right{color:var(--good)}
.review .why{margin-top:8px;color:var(--muted);font-size:.95rem;white-space:pre-line}
.end-acts{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}

/* Practice (written) questions */
.practice{list-style:none;margin:20px 0 0;padding:0;border-top:1px solid var(--line)}
.practice>li{padding:20px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:3em 1fr;gap:12px}
.practice>li>*{min-width:0}
.practice .pn{font-family:var(--mono);font-size:.85rem;color:var(--muted);padding-top:3px}
.practice .pq{white-space:pre-line;max-width:66ch}
.practice .parts{margin:8px 0 0;padding-left:0;list-style:none;color:var(--ink)}
.practice details{margin-top:12px}
.practice summary{cursor:pointer;font-family:var(--display);font-weight:600;color:var(--accent-ink);display:inline-block}
.practice .model{margin-top:10px;padding:14px 16px;background:var(--soft);border-radius:10px;white-space:pre-line;font-size:.98rem;max-width:66ch}
.model-block{margin-top:16px}
.model-block details{background:var(--soft);border-radius:10px;padding:14px 16px}
.model-block summary{cursor:pointer;font-family:var(--display);font-weight:600;color:var(--accent-ink)}
.model-block ol{margin:12px 0 0;padding-left:1.4em;display:flex;flex-direction:column;gap:10px}
.model-block li{white-space:pre-line}

.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:64px}
.pager a{display:flex;flex-direction:column;gap:4px;padding:18px 20px;border:1px solid var(--line);border-radius:12px;text-decoration:none;color:var(--ink);background:var(--surface);min-width:0}
.pager a:hover{border-color:var(--accent)}
.pager a.next{text-align:right;grid-column:2}
.pager b{font-family:var(--display);font-weight:600;font-size:1.05rem}
@media (max-width:560px){.pager{grid-template-columns:1fr}.pager a.next{grid-column:1}}

/* Prose pages */
.prose{max-width:66ch;display:flex;flex-direction:column;gap:14px;padding-bottom:24px}
.prose h2{font-size:1.4rem;font-weight:600;margin-top:18px}

.legal{padding-block:56px 24px}
.legal h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;letter-spacing:-.03em}
.legal ul{margin:0;padding-left:1.2em;display:flex;flex-direction:column;gap:8px}

/* Paid courses: buy box, locks, sign-in */
.buy{margin:8px 0 40px;scroll-margin-top:96px}
#locked-note{scroll-margin-top:96px}
.offers{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.offer{background:var(--surface);border:1.5px solid var(--line);border-radius:14px;padding:22px;display:flex;flex-direction:column;gap:10px;min-width:0}
.offer.main{border-color:var(--accent)}
.offer .price{font-family:var(--display);font-weight:800;font-size:2.4rem;line-height:1;letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.offer .price small{font-size:.85rem;font-weight:600;color:var(--muted);letter-spacing:0}
.offer p{color:var(--muted);font-size:.98rem}
.offer .btn{align-self:flex-start;margin-top:auto}
.small-note{margin-top:14px;font-size:.92rem;color:var(--muted)}
.owned{background:var(--surface);border:1.5px solid var(--accent);border-radius:14px;padding:24px;display:flex;flex-direction:column;gap:10px;align-items:flex-start}
.owned h2{font-size:1.6rem;font-weight:800;letter-spacing:-.02em}
.owned p{color:var(--muted)}
.locked-note{background:var(--soft);border-radius:12px;padding:14px 18px;margin-bottom:20px}
.modules h3 .pill{margin-left:8px;vertical-align:middle}
.lock{display:inline-flex;align-items:center;gap:4px;margin-left:8px;font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);vertical-align:middle}
.upsell{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:28px}
.upsell .offers{margin-top:20px}
.auth-wrap{max-width:720px;padding-block:72px 24px}
.auth-wrap h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;letter-spacing:-.03em;margin-top:10px}
.auth-wrap .lede{margin-top:14px;color:var(--muted);font-size:1.1rem;max-width:56ch}
.auth-form{margin-top:28px;display:flex;flex-direction:column;gap:8px}
.auth-form label{font-family:var(--display);font-weight:600}
.auth-form .row{display:flex;gap:8px;flex-wrap:wrap}
.auth-form input{flex:1;min-width:0;font:inherit;font-size:1rem;padding:.8em 1em;border-radius:999px;border:1.5px solid var(--line);background:var(--surface);color:var(--ink)}
.auth-form input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.auth-form .msg{min-height:1.5em;color:var(--ink);margin-top:6px}
.auth-help{margin-top:40px;display:flex;flex-direction:column;gap:12px;color:var(--muted);font-size:.98rem;border-top:1px solid var(--line);padding-top:24px}
.notice{margin-top:20px;background:var(--bad-soft);color:var(--ink);border-radius:12px;padding:12px 16px}
.notice.good{background:var(--good-soft)}
.owned-list{list-style:none;margin:28px 0 0;padding:0;border-top:1px solid var(--line)}
.owned-list li{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;padding:18px 0;border-bottom:1px solid var(--line)}
.owned-list li>div{min-width:0}
.owned-list h3{font-size:1.25rem;font-weight:600}
.owned-list .sub{display:block;font-family:var(--mono);font-size:.75rem;color:var(--muted);margin-top:4px;letter-spacing:.04em}
.acct-h2{font-size:1.4rem;font-weight:800;margin-top:40px}
.course .price-tag{font-family:var(--display);font-weight:800;font-size:1.5rem;letter-spacing:-.02em}


/* ===== Navy & gold treatment ===== */
body{font-size:1.0625rem}
h1,h2,h3,h4{letter-spacing:-.005em}
.btn{font-family:var(--body);font-weight:600;border-radius:6px;letter-spacing:.01em}
.btn.small{border-radius:5px}
.pill{font-weight:600}
.label{font-weight:600;letter-spacing:.12em}
.nav ul,.levels button,.auth-form label,.feedback,.opts button .mark,.practice summary,.model-block summary,details.curr summary,.graph .ctrl label,.pager b,.news .msg{font-family:var(--body)}

/* Header: navy band, gold wordmark */
header.top{background:var(--band);border-bottom:2px solid var(--gold);backdrop-filter:none}
.brand{color:var(--band-ink);font-family:var(--mark);font-weight:800;font-size:1.02rem;letter-spacing:.14em;text-transform:uppercase;gap:12px}
.brand .wm{display:flex;flex-direction:column;line-height:1.02}
.brand .wm b{color:var(--gold-bright);font-weight:800}
.brand .wm span{color:var(--band-ink);font-weight:600;font-size:.72em;letter-spacing:.32em}
.brand svg{width:30px;height:30px}
.nav ul a{color:var(--band-ink);opacity:.82;font-weight:500}
.nav ul a:hover,.nav ul a[aria-current]{opacity:1;color:var(--gold-bright)}
header.top .btn{background:var(--gold-bright);border-color:var(--gold-bright);color:#0F1E3A}

/* Hero: navy band */
.hero-band{background:linear-gradient(180deg,var(--band) 0%,var(--band-2) 100%);color:var(--band-ink)}
.hero-band .hero{padding-block:72px 64px}
.hero-band .label{color:var(--gold-bright)}
.hero-band h1{font-weight:600;letter-spacing:-.02em;color:var(--band-ink)}
.hero-band h1 em{font-style:italic;color:var(--gold-bright)}
.hero-band .lede{color:var(--band-muted)}
.hero-band .creds .label{color:var(--band-muted)}
.hero-band .btn{background:var(--gold-bright);border-color:var(--gold-bright);color:#0F1E3A}
.hero-band .btn.ghost{background:transparent;border-color:rgba(244,241,232,.55);color:var(--band-ink)}
.hero-band .btn.ghost:hover{background:rgba(244,241,232,.08)}
.hero-band .graph{box-shadow:0 18px 40px rgba(3,10,25,.35);border-color:transparent}
.hero-band .creds{border-top:1px solid rgba(210,162,76,.35);padding-top:18px}

/* Section heads: gold rule above the eyebrow */
.sec-head>.label{border-top:2px solid var(--gold);padding-top:12px;align-self:start}
.sec-head h2,.about h2{font-weight:600;letter-spacing:-.015em}
.page-head h1,.auth-wrap h1,.legal h1{font-weight:600;letter-spacing:-.02em}
.course h3,.owned h2{font-weight:600}
.course .price-tag,.offer .price,.slot .dur,.score b,.stats b{font-family:var(--display);color:var(--ink)}
.offer.main{border-color:var(--gold)}
.offer.main .price{color:var(--ink)}
.slot.main{border-color:var(--gold)}
.course{border-top:3px solid var(--gold)}
.modules .num{color:var(--gold);font-weight:700}
.mono-badge{background:var(--band);color:var(--gold-bright);border-color:var(--gold);font-family:var(--mark);font-size:2rem;letter-spacing:.06em}
.news{background:var(--band);color:var(--band-ink);border-top:3px solid var(--gold)}
.news .msg{color:var(--gold-bright)}
.news .btn{background:var(--gold-bright);border-color:var(--gold-bright);color:#0F1E3A}
.news input[type=email]{border-color:rgba(244,241,232,.35);color:var(--band-ink)}
.news input[type=email]::placeholder{color:rgba(244,241,232,.55)}
footer{background:var(--band);color:var(--band-muted);border-top:2px solid var(--gold);margin-top:88px}
footer a{color:var(--band-muted)}
footer a:hover{color:var(--gold-bright)}
.levels button[aria-selected="true"]{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.progress i.cur{background:var(--gold)}
.hero-band .graph{color:var(--ink)}
.hero-band .graph .label{color:var(--muted)}
.hero-band .graph a{color:var(--accent-ink)}

/* Interactive lab widgets */
.lab{max-width:760px}
.lab .graph-head h3{font-size:1.15rem;font-weight:600}
.lab-mode{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:12px;font-weight:600}
.lab-mode label{display:inline-flex;align-items:center;gap:8px;cursor:pointer}
.lab-mode label span{font-weight:400;color:var(--muted)}
.lab-mode input{accent-color:var(--accent);width:16px;height:16px}
.lab .ctrl input[type=range]{accent-color:var(--bad)}
.lab-price{font-family:var(--display);font-weight:600;font-size:1.15rem;min-width:3.2em;text-align:right;font-variant-numeric:tabular-nums}
.lab-readout{grid-template-columns:repeat(3,1fr)}
@media (max-width:520px){.lab-readout{grid-template-columns:1fr 1fr}.lab-readout div:last-child{grid-column:1/-1}}
.lab-band{display:grid;grid-template-columns:minmax(0,340px) minmax(0,1fr);gap:40px;align-items:start}
.lab-band .intro{color:var(--muted);margin-top:12px;max-width:42ch}
.lab-band ul{margin:16px 0 0;padding-left:1.1em;color:var(--muted);display:flex;flex-direction:column;gap:6px}
@media (max-width:860px){.lab-band{grid-template-columns:1fr;gap:24px}}

/* FAQ */
.faq{margin-top:64px;max-width:820px}
.faq h2{font-size:clamp(1.6rem,3vw,2.2rem);font-weight:600;letter-spacing:-.015em;border-top:2px solid var(--gold);padding-top:14px}
.faq-list{margin-top:18px;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line);padding:16px 2px}
.faq-item summary{cursor:pointer;font-weight:600;font-size:1.06rem;list-style:none;display:flex;justify-content:space-between;gap:16px;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";color:var(--gold);font-size:1.4rem;font-weight:400;line-height:1}
.faq-item[open] summary::after{content:"–"}
.faq-item p{margin-top:10px;color:var(--muted);max-width:68ch}
/* Practice exams */
.exam-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(320px,100%),1fr));gap:20px;margin-top:8px}
.exam-card{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--gold);border-radius:var(--r);padding:24px;display:flex;flex-direction:column;gap:10px}
.exam-card h3{font-family:var(--display);font-size:1.45rem;font-weight:600;letter-spacing:-.01em}
.exam-card p{color:var(--muted)}
.exam-card .acts{display:flex;gap:10px;flex-wrap:wrap;margin-top:auto;padding-top:8px}