/* Public site styles. The color and type tokens mirror the :root blocks in src/index.html; change both together. */
:root{
  --bg:#EDF0F3; --surface:#FFFFFF; --surface-2:#F5F7F9; --ink:#111923; --ink-2:#465262; --ink-3:#768292;
  --line:#D6DCE4; --grid:#E4E9EF; --accent:#2346D0; --accent-ink:#FFFFFF; --accent-soft:#E3E9FC;
  --supply:#C45C12; --supply-soft:#FBE9DB; --good:#157F52; --good-soft:#DDF2E7; --bad:#BD3326; --bad-soft:#FBE3E0;
  --due:#A86A0C; --due-soft:#FBEFD6; --locked:#B8C0CA;
  --display:"Bricolage Grotesque", "Avenir Next", system-ui, sans-serif;
  --body:"IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:"IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#0D131A; --surface:#151D27; --surface-2:#1B2531; --ink:#E7ECF2; --ink-2:#A9B4C2; --ink-3:#798596;
    --line:#2A3544; --grid:#212B37; --accent:#7F99FF; --accent-ink:#0D131A; --accent-soft:#1E2A4F;
    --supply:#F29450; --supply-soft:#3A2717; --good:#46C68D; --good-soft:#15342A; --bad:#F2776C; --bad-soft:#3C1E1C;
    --due:#E6AE52; --due-soft:#3A2D14; --locked:#3B4757;
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0D131A; --surface:#151D27; --surface-2:#1B2531; --ink:#E7ECF2; --ink-2:#A9B4C2; --ink-3:#798596;
  --line:#2A3544; --grid:#212B37; --accent:#7F99FF; --accent-ink:#0D131A; --accent-soft:#1E2A4F;
  --supply:#F29450; --supply-soft:#3A2717; --good:#46C68D; --good-soft:#15342A; --bad:#F2776C; --bad-soft:#3C1E1C;
  --due:#E6AE52; --due-soft:#3A2D14; --locked:#3B4757;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased;min-height:100vh;display:flex;flex-direction:column}
main{flex:1}
a{color:var(--accent);text-underline-offset:3px}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
h1,h2,h3,h4{font-family:var(--display);text-wrap:balance;margin:0;line-height:1.15}
p{margin:0 0 12px}
.wrap{max-width:1120px;margin:0 auto;padding-inline:20px}
.wrap.narrow{max-width:560px;padding-block:40px 64px}
@media (max-width:480px){.wrap{padding-inline:16px}}
.muted{color:var(--ink-3)}
.small{font-size:13px}
.eyebrow{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);font-weight:600}

/* top bar */
.top{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:14px;min-height:58px;padding-block:8px}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--display);font-weight:800;font-size:21px;letter-spacing:-.02em;color:var(--ink);text-decoration:none}
.brand svg{width:26px;height:26px}
.nav{margin-left:auto;display:flex;gap:6px;align-items:center}
.nav a:not(.btn){padding:6px 11px;border-radius:7px;color:var(--ink-2);font-weight:500;text-decoration:none}
.nav a:not(.btn):hover{color:var(--ink)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:9px 16px;border-radius:9px;font-weight:600;text-decoration:none;line-height:1.3}
.btn:hover{border-color:var(--ink-3)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.primary:hover{filter:brightness(1.08)}
.btn.small{padding:6px 12px;font-size:14px}
.btn.big{padding:13px 22px;font-size:16px;border-radius:11px}
.btn.wide{width:100%}
.btn.danger{color:var(--bad)}
.btn.danger:hover{border-color:var(--bad)}
.linkbtn{background:none;border:0;padding:0;color:var(--accent);font-weight:500;text-decoration:underline;text-underline-offset:3px}
.actions{display:flex;gap:14px;align-items:center;flex-wrap:wrap}

/* hero */
.hero{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:48px;align-items:center;padding-block:72px 56px}
@media (max-width:900px){.hero{grid-template-columns:1fr;gap:36px;padding-block:44px 36px}}
.hero-text{display:flex;flex-direction:column;gap:18px}
.hero h1{font-size:clamp(34px,5.4vw,58px);font-weight:800;letter-spacing:-.035em;line-height:1.02}
.lead{font-size:clamp(16px,1.6vw,18.5px);color:var(--ink-2);max-width:56ch;margin:0}
.demo{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px;display:flex;flex-direction:column;gap:10px;box-shadow:0 18px 40px -24px color-mix(in srgb,var(--ink) 30%,transparent);transform:rotate(-1deg)}
@media (max-width:900px){.demo{transform:none}}
.demo-head{display:flex;justify-content:space-between;align-items:baseline;font-size:13px;padding:0 2px 4px}
.task{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:12px;align-items:center;background:var(--surface-2);border:1px solid var(--line);border-radius:11px;padding:11px 13px}
.task .kind{font-size:10.5px;letter-spacing:.07em;text-transform:uppercase;font-weight:600;padding:3px 7px;border-radius:5px;min-width:60px;text-align:center}
.kind.lesson{background:var(--accent-soft);color:var(--accent)}
.kind.review{background:var(--due-soft);color:var(--due)}
.kind.quiz{background:var(--supply-soft);color:var(--supply)}
.task .t{display:block;font-weight:600;font-size:15px}
.task .u{display:block;font-size:12.5px;color:var(--ink-3)}
.task .xp{font-family:var(--mono);font-size:12px;color:var(--ink-2);white-space:nowrap}

/* sections */
.block{padding-block:40px}
section[id]{scroll-margin-top:70px}
.block-head{display:flex;flex-direction:column;gap:10px;margin-bottom:8px}
.block h2{font-size:clamp(26px,3.4vw,36px);font-weight:800;letter-spacing:-.025em}
.block-head p{max-width:70ch;margin:0}
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
@media (max-width:800px){.steps{grid-template-columns:1fr}}
.steps>div{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px}
.steps h3{font-size:19px;margin:12px 0 8px}
.steps p{color:var(--ink-2);margin:0;font-size:14.5px}
.num{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--ink);color:var(--bg);font-family:var(--mono);font-weight:500;font-size:14px}
.cgroup{margin-top:30px}
.cgroup h3{display:flex;align-items:baseline;gap:10px;font-size:15px;font-family:var(--body);font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);margin-bottom:12px}
.cgroup h3 span{font-weight:400;letter-spacing:0;text-transform:none;font-size:13px}
.cgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.ccard{display:flex;flex-direction:column;gap:8px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px}
.ccard h4{font-size:17px;font-weight:700;letter-spacing:-.01em}
.ccard p{margin:0;font-size:13.5px;color:var(--ink-2);flex:1}
.ccard .meta{font-size:12.5px;color:var(--ink-3);font-family:var(--mono)}
.price-card{max-width:560px;margin:0 auto;background:var(--surface);border:1.5px solid var(--accent);box-shadow:0 0 0 4px var(--accent-soft);border-radius:18px;padding:32px;display:flex;flex-direction:column;gap:14px}
.price-card h2{font-size:clamp(28px,3.6vw,38px)}
.price{font-size:17px;color:var(--ink-2);margin:0}
.price b{font-family:var(--display);font-size:30px;color:var(--ink);letter-spacing:-.02em}
.checks{list-style:none;margin:4px 0 8px;padding:0;display:flex;flex-direction:column;gap:8px}
.checks li{padding-left:28px;position:relative}
.checks li::before{content:"";position:absolute;left:4px;top:.32em;width:12px;height:7px;border-left:2.5px solid var(--good);border-bottom:2.5px solid var(--good);transform:rotate(-45deg)}
.faq{max-width:760px}
.faq h2{margin-bottom:16px}
.faq details{border-bottom:1px solid var(--line);padding:14px 2px}
.faq summary{cursor:pointer;font-weight:600;font-size:16px}
.faq details p{margin:10px 0 0;color:var(--ink-2);max-width:64ch}

/* cards, forms and notices */
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px}
.card h2{font-size:18px;margin-bottom:12px}
.auth{display:flex;flex-direction:column;gap:14px;padding:30px}
.auth h1{font-size:28px;font-weight:800;letter-spacing:-.025em}
.auth p{margin:0}
.auth form{display:flex;flex-direction:column;gap:14px}
.auth .alt{font-size:14px;text-align:center}
.auth form.alt{display:block}
.field{display:flex;flex-direction:column;gap:6px}
.field span{font-weight:600;font-size:14px}
.field input{font:inherit;font-size:16px;color:var(--ink);background:var(--surface);border:1.5px solid var(--line);border-radius:9px;padding:10px 12px;width:100%}
.field input:focus{outline:none;border-color:var(--accent)}
.field small{color:var(--ink-3);font-size:12.5px}
.notice{border-radius:10px;padding:11px 14px;border:1px solid;font-size:14.5px}
.notice.bad{background:var(--bad-soft);border-color:color-mix(in srgb,var(--bad) 40%,transparent)}
.notice.good{background:var(--good-soft);border-color:color-mix(in srgb,var(--good) 40%,transparent)}
.account{display:flex;flex-direction:column;gap:18px}
.account-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap}
.account-head h1{font-size:32px;font-weight:800;letter-spacing:-.025em}
.account .card p:last-child{margin-bottom:0}
.account .card form + p{margin-top:10px}
.stack{display:flex;flex-direction:column;gap:14px;align-items:flex-start}
.stack .field{align-self:stretch}
.row{display:flex;gap:10px;flex-wrap:wrap}
.filebtn{position:relative;overflow:hidden}
.filebtn input{position:absolute;inset:0;opacity:0;cursor:pointer}
.filebtn:focus-within{outline:2px solid var(--accent);outline-offset:2px}
#import-msg:empty{display:none}
#import-msg{margin:10px 0 0}
.danger-zone{border-color:color-mix(in srgb,var(--bad) 35%,var(--line))}

/* legal */
.legal{max-width:720px}
.legal h1{font-size:34px;font-weight:800;letter-spacing:-.025em;margin-bottom:6px}
.legal h2{font-size:19px;margin:28px 0 10px}
.legal ul{padding-left:20px;margin:0 0 12px}
.legal li{margin-bottom:6px}

footer{border-top:1px solid var(--line);padding-block:20px;font-size:13px;color:var(--ink-3);margin-top:24px}
footer .wrap{display:flex;gap:14px;justify-content:space-between;flex-wrap:wrap}
footer .links{display:flex;gap:16px}
footer a{color:var(--ink-2)}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}