/* Layout: explainer notebook. Cream page, navy ink, coral "hook bars" like the video captions,
   hard offset shadows on the few things you can press. Single light look, from the brand guide. */
@font-face{font-family:"Inter";font-weight:400;font-display:swap;src:url(fonts/inter-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Inter";font-weight:600;font-display:swap;src:url(fonts/inter-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:"Inter";font-weight:800;font-display:swap;src:url(fonts/inter-latin-800-normal.woff2) format("woff2")}
@font-face{font-family:"Inter";font-weight:900;font-display:swap;src:url(fonts/inter-latin-900-normal.woff2) format("woff2")}

:root{
  --navy:#1F2A4A; --ink-soft:#4B536E; --ink-faint:#6A7190;
  --red:#E05038; --green:#2E9E6A; --amber:#F2A83B;
  --cream:#FFF3DC; --peach:#FFE2D4; --sky:#E6F0FF; --paper:#FFFDF8; --line:#E9DCC4;
  --display:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --body:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --step-0:1rem; --step-1:1.2rem; --step-2:1.5rem; --step-3:2rem; --step-4:clamp(2.2rem,5.5vw,3.4rem);
  color-scheme:light;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;font-family:var(--body);font-size:var(--step-0);line-height:1.6;color:var(--navy);background:var(--cream)}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy);text-decoration-color:var(--red);text-decoration-thickness:2px;text-underline-offset:3px}
a:hover{color:var(--red)}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px;border-radius:4px}
.wrap{max-width:1080px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.narrow{max-width:720px}
h1,h2,h3{font-family:var(--display);line-height:1.15;text-wrap:balance;margin:0}
h1{font-size:var(--step-4);font-weight:900;letter-spacing:-.02em}
h2{font-size:var(--step-3);font-weight:900;letter-spacing:-.01em}
h3{font-size:var(--step-1);font-weight:800}
p{margin:0}
.prose{display:grid;gap:1rem;max-width:68ch}
.prose h2{font-size:var(--step-2);margin-top:1rem}
.prose ul,.prose ol{margin:0;padding-left:1.3rem;display:grid;gap:.4rem}
.lead{font-size:var(--step-1);color:var(--ink-soft);max-width:60ch}
.tag{display:inline-block;align-self:start;justify-self:start;background:var(--red);color:#fff;font-weight:900;font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;padding:.3rem .6rem;border-radius:4px}
.tag.navy{background:var(--navy);color:var(--amber)}
.tag.green{background:var(--green)}
.hook{background:linear-gradient(transparent 58%,var(--amber) 58%,var(--amber) 90%,transparent 90%)}

/* header */
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--navy)}
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:9;background:var(--navy);color:#fff}
.top .wrap{display:flex;align-items:center;gap:1rem;min-height:62px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:.6rem;color:#fff;text-decoration:none;font-weight:900;letter-spacing:.02em;text-transform:uppercase;font-size:.95rem}
.logo img{width:38px;height:38px;border-radius:50%;border:2px solid var(--amber);background:var(--amber)}
.logo span{color:var(--amber)}
.logo:hover{color:#fff}
.nav{display:flex;gap:.2rem;margin-left:auto;flex-wrap:wrap}
.nav a{color:#fff;text-decoration:none;font-weight:600;font-size:.92rem;padding:.45rem .7rem;border-radius:6px}
.nav a:hover,.nav a[aria-current="page"]{background:rgba(255,255,255,.12);color:var(--amber)}
.menu{display:none;margin-left:auto;background:none;border:2px solid var(--amber);color:#fff;font:inherit;font-weight:800;border-radius:8px;padding:.35rem .8rem;cursor:pointer}
@media (max-width:820px){
  .menu{display:block}
  .nav{display:none;width:100%;flex-direction:column;padding-bottom:.8rem;margin-left:0}
  .nav.open{display:flex}
}

/* sections */
section{padding-block:clamp(2.5rem,6vw,4.5rem)}
.band-peach{background:linear-gradient(170deg,var(--cream),var(--peach))}
.band-sky{background:var(--sky)}
.band-navy{background:var(--navy);color:#fff}
.band-navy a{color:#fff}
.band-navy .lead{color:#D9DCEF}
.head{display:grid;gap:.7rem;margin-bottom:1.8rem}

/* hero */
.hero{padding-block:clamp(2rem,5vw,3.5rem) 0;background:linear-gradient(170deg,var(--cream),var(--peach));overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.3fr .7fr;gap:2rem;align-items:end}
.hero .text{display:grid;gap:1.1rem;padding-bottom:clamp(2rem,5vw,3.5rem);min-width:0}
.hero .pro{justify-self:center;max-width:300px}
.fee-strip{display:flex;flex-wrap:wrap;gap:.5rem 1.2rem;align-items:baseline;font-size:.95rem;color:var(--ink-soft)}
.fee-strip b{font-size:var(--step-2);font-weight:900;color:var(--red);font-variant-numeric:tabular-nums}
@media (max-width:720px){.hero .wrap{grid-template-columns:1fr}.hero .pro{max-width:200px;order:-1}.hero .text{padding-bottom:2rem}}

/* buttons */
.btns{display:flex;flex-wrap:wrap;gap:.8rem}
.btn{display:inline-flex;align-items:center;gap:.5rem;font-weight:800;text-decoration:none;color:var(--navy);background:#fff;border:2px solid var(--navy);border-radius:12px;padding:.75rem 1.1rem;box-shadow:0 3px 0 var(--navy);transition:transform .1s,box-shadow .1s;cursor:pointer;font-family:inherit;font-size:1rem}
.btn:hover{color:var(--navy);transform:translateY(-1px);box-shadow:0 4px 0 var(--navy)}
.btn:active{transform:translateY(2px);box-shadow:0 1px 0 var(--navy)}
.btn.primary{background:var(--navy);color:#fff;box-shadow:0 3px 0 var(--red)}
.btn.primary:hover{color:#fff;box-shadow:0 4px 0 var(--red)}
.btn.red{background:var(--red);border-color:var(--red);color:#fff;box-shadow:0 3px 0 var(--navy)}
.btn.red:hover{color:#fff}

/* video cards */
.grid{display:grid;gap:1.4rem;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.vcard{display:grid;gap:.6rem;text-decoration:none;color:var(--navy);align-content:start}
.vcard .thumb{position:relative;border-radius:12px;overflow:hidden;border:2px solid var(--navy);aspect-ratio:16/9;background:var(--navy)}
.vcard .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .25s}
.vcard:hover .thumb img{transform:scale(1.04)}
.vcard .len{position:absolute;right:8px;bottom:8px;background:var(--navy);color:#fff;font-size:.78rem;font-weight:800;padding:.1rem .45rem;border-radius:4px;font-variant-numeric:tabular-nums}
.vcard .soon{position:absolute;left:8px;bottom:8px}
.vcard h3{font-size:1.02rem;line-height:1.3}
.vcard:hover h3{color:var(--red)}
.vcard .meta{font-size:.82rem;color:var(--ink-faint);font-weight:600;text-transform:uppercase;letter-spacing:.06em}
.chips{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.6rem}
.chip{font:inherit;font-weight:700;font-size:.9rem;padding:.4rem .9rem;border-radius:999px;border:2px solid var(--navy);background:transparent;color:var(--navy);cursor:pointer}
.chip[aria-pressed="true"]{background:var(--navy);color:var(--amber)}

/* steps (start here) */
.steps{list-style:none;margin:0;padding:0;display:grid;gap:1.2rem;counter-reset:s}
.step{display:grid;grid-template-columns:auto 1fr;gap:1rem 1.2rem;background:var(--paper);border:2px solid var(--line);border-radius:16px;padding:1.3rem;counter-increment:s}
.step::before{content:counter(s);display:grid;place-items:center;width:3rem;height:3rem;border-radius:50%;background:var(--navy);color:var(--amber);font-weight:900;font-size:1.3rem}
.step > div{display:grid;gap:.6rem;min-width:0}
.step .links{display:flex;flex-wrap:wrap;gap:.4rem 1rem;font-weight:700;font-size:.95rem}

/* teaser tiles */
.tiles{display:grid;gap:1.2rem;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.tile{display:grid;gap:.6rem;align-content:start;background:var(--paper);border:2px solid var(--navy);border-radius:16px;padding:1.3rem;text-decoration:none;color:var(--navy);box-shadow:0 4px 0 var(--navy)}
.tile:hover{color:var(--navy);transform:translateY(-2px)}
.tile p{color:var(--ink-soft);font-size:.95rem}
.tile .go{font-weight:800;color:var(--red)}

/* calculators */
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:1.5rem;background:var(--paper);border:2px solid var(--navy);border-radius:18px;padding:clamp(1rem,3vw,1.8rem);scroll-margin-top:90px}
.calc + .calc{margin-top:2rem}
.calc .intro{grid-column:1/-1;display:grid;gap:.5rem}
.calc form{display:grid;gap:.9rem;align-content:start}
.field{display:grid;gap:.3rem}
.field label{font-weight:700;font-size:.92rem}
.field .row{display:flex;align-items:center;gap:.5rem}
.field input{width:100%;min-width:0;font:inherit;font-weight:700;font-variant-numeric:tabular-nums;padding:.6rem .7rem;border:2px solid var(--navy);border-radius:10px;background:#fff;color:var(--navy)}
.field .unit{font-weight:700;color:var(--ink-soft);white-space:nowrap}
.out{display:grid;gap:1rem;align-content:start;min-width:0}
.big{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.8rem}
.big div{background:var(--cream);border-radius:12px;padding:.8rem 1rem;display:grid;gap:.15rem}
.big span{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft)}
.big b{font-size:var(--step-2);font-weight:900;font-variant-numeric:tabular-nums}
.big .bad b{color:var(--red)} .big .good b{color:var(--green)}
.chart{width:100%;height:auto;background:#fff;border-radius:12px;border:1px solid var(--line)}
.note{font-size:.85rem;color:var(--ink-faint)}
.mtable{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
.mtable th,.mtable td{text-align:left;padding:.5rem .4rem;border-bottom:1px solid var(--line)}
.mtable td:last-child,.mtable th:last-child{text-align:right}
@media (max-width:760px){.calc{grid-template-columns:1fr}}

/* tools */
.tools{display:grid;gap:1.2rem;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.tool{display:grid;gap:.7rem;grid-template-rows:auto auto 1fr auto;background:var(--paper);border:2px solid var(--line);border-radius:16px;padding:1.3rem}
.tool .kind{font-size:.78rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint)}
.tool dl{margin:0;display:grid;gap:.5rem;font-size:.93rem}
.tool dt{font-weight:800}
.tool dd{margin:0;color:var(--ink-soft)}
.tool .btn{justify-self:start}
.aff-note{font-size:.78rem;color:var(--ink-faint)}
.disclose{background:var(--sky);border-radius:12px;padding:1rem 1.2rem;font-size:.92rem;display:grid;gap:.3rem}

/* video page */
.vhero{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:2rem;align-items:center}
@media (max-width:800px){.vhero{grid-template-columns:1fr}}
.player{position:relative;display:block;border-radius:16px;overflow:hidden;border:3px solid var(--navy);box-shadow:0 6px 0 var(--navy);aspect-ratio:16/9;max-width:100%}
.player img{width:100%;height:100%;object-fit:cover}
.player .play{position:absolute;inset:0;display:grid;place-items:center}
.player .play span{background:var(--red);color:#fff;font-weight:900;padding:.7rem 1.2rem;border-radius:999px;border:3px solid #fff;box-shadow:0 4px 18px rgba(0,0,0,.25)}
.chapters{list-style:none;margin:0;padding:0;display:grid;gap:.15rem;font-variant-numeric:tabular-nums}
.chapters li{display:grid;grid-template-columns:4.2rem 1fr;gap:.5rem;padding:.35rem 0;border-bottom:1px dashed var(--line)}
.chapters time{font-weight:800;color:var(--red)}
.cols{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:2.5rem;align-items:start}
@media (max-width:860px){.cols{grid-template-columns:1fr}}
aside.side{display:grid;gap:1.2rem;position:sticky;top:90px}
@media (max-width:860px){aside.side{position:static}}
.box{background:var(--paper);border:2px solid var(--line);border-radius:16px;padding:1.2rem;display:grid;gap:.7rem}
.box ul{margin:0;padding-left:1.1rem;display:grid;gap:.35rem}
details.transcript{background:var(--paper);border:2px solid var(--line);border-radius:16px;padding:1rem 1.2rem}
details.transcript summary{cursor:pointer;font-weight:800}
details.transcript .prose{margin-top:1rem;color:var(--ink-soft)}
.warn{border-left:5px solid var(--amber);background:var(--paper);padding:.9rem 1.1rem;border-radius:0 12px 12px 0;font-size:.92rem;color:var(--ink-soft)}
.crumbs{font-size:.88rem;font-weight:600;color:var(--ink-faint);display:flex;gap:.4rem;flex-wrap:wrap}

/* forms */
.form{display:grid;gap:1rem;max-width:560px}
.form label{display:grid;gap:.35rem;font-weight:700}
.form input,.form textarea{font:inherit;padding:.7rem .8rem;border:2px solid var(--navy);border-radius:10px;background:#fff;color:var(--navy);width:100%}
.hp{position:absolute;left:-9999px}
.status{font-weight:700}

/* checklist */
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.8fr);gap:2.5rem;align-items:center}
@media (max-width:760px){.split{grid-template-columns:1fr}}
.cover{border-radius:12px;border:2px solid var(--navy);box-shadow:0 6px 0 var(--navy);max-width:340px;justify-self:center}
.ticks{list-style:none;margin:0;padding:0;display:grid;gap:.5rem}
.ticks li{padding-left:1.8rem;position:relative}
.ticks li::before{content:"✓";position:absolute;left:0;top:0;color:var(--green);font-weight:900}

/* footer */
footer{background:var(--navy);color:#D9DCEF;padding-block:2.5rem;font-size:.9rem}
footer .wrap{display:grid;gap:1.5rem}
footer .cols3{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1.5rem}
footer h4{margin:0 0 .5rem;color:var(--amber);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase}
footer ul{list-style:none;margin:0;padding:0;display:grid;gap:.3rem}
footer a{color:#fff;text-decoration:none}
footer a:hover{color:var(--amber)}
footer .fine{border-top:1px solid rgba(255,255,255,.15);padding-top:1.2rem;font-size:.8rem;color:#AEB3CC;display:grid;gap:.4rem}
.big.four{grid-template-columns:repeat(2,minmax(0,1fr))}
.qr{display:none;align-items:center;gap:.8rem;background:#fff;border:2px solid var(--line);border-radius:12px;padding:.5rem .8rem .5rem .5rem;font-size:.85rem;color:var(--ink-soft)}
.qr img{width:96px;height:96px;flex:none}
@media (hover:hover) and (pointer:fine) and (min-width:820px){.qr{display:flex}}