/* KEENUMBERS - mobile-first, no dependencies, system fonts. */
:root{
  --bg:#fffaf0; --surface:#ffffff; --ink:#1f2937; --muted:#4b5563;
  --primary:#0b6e6e; --primary-dark:#07514f; --primary-soft:#e0f4f1;
  --accent:#f59f00; --accent-dark:#b36f00; --coral:#e8590c;
  --line:#e5e1d5; --good:#2b8a3e; --warn:#b36f00; --bad:#c92a2a;
  --radius:14px; --shadow:0 2px 10px rgba(31,41,55,.08);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;font-family:var(--font);font-size:1.0625rem;line-height:1.6;color:var(--ink);background:var(--bg)}
img,svg{max-width:100%;height:auto}
a{color:var(--primary-dark);text-underline-offset:2px}
a:hover{color:var(--coral)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
h1,h2,h3{line-height:1.2;margin:0 0 .5em;color:#10302f}
h1{font-size:clamp(1.9rem,6vw,3rem)}
h2{font-size:clamp(1.4rem,4vw,2rem)}
h3{font-size:1.15rem}
p{margin:0 0 1em}
.wrap{width:100%;max-width:1060px;margin:0 auto;padding:0 1.1rem}
.narrow{max-width:760px}
.skip{position:absolute;left:-999px;top:0;background:#fff;color:#000;padding:.6rem 1rem;z-index:100}
.skip:focus{left:.5rem;top:.5rem}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* preview banner */
.preview-banner{background:#fff3bf;color:#5c4400;font-size:.88rem;text-align:center;padding:.4rem 1rem;border-bottom:1px solid #f0d96b}

/* header */
.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-row{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:60px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.5rem;font-weight:800;font-size:1.2rem;color:var(--primary-dark);text-decoration:none}
.brand-mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--primary);color:#fff;font-weight:800}
.nav-toggle{display:none;background:none;border:2px solid var(--primary);color:var(--primary-dark);border-radius:10px;padding:.35rem .75rem;font:inherit;font-weight:700;cursor:pointer}
.site-nav ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.1rem .25rem}
.site-nav a{display:block;padding:.45rem .7rem;border-radius:8px;text-decoration:none;color:var(--ink);font-weight:600;font-size:.98rem}
.site-nav a:hover{background:var(--primary-soft);color:var(--primary-dark)}
.site-nav a[aria-current="page"]{background:var(--primary-soft);color:var(--primary-dark)}
.js .nav-toggle{display:inline-block}
.js .site-nav{display:none;width:100%}
.js .site-nav.open{display:block;padding-bottom:.6rem}
.js .site-nav ul{flex-direction:column}
@media (min-width:760px){
  .js .nav-toggle{display:none}
  .js .site-nav{display:block;width:auto}
  .js .site-nav ul{flex-direction:row}
}

/* buttons */
.btn{display:inline-block;padding:.8rem 1.4rem;border-radius:999px;border:2px solid var(--primary);background:var(--primary);color:#fff;font:inherit;font-weight:700;text-decoration:none;cursor:pointer;text-align:center;min-height:44px}
.btn:hover{background:var(--primary-dark);border-color:var(--primary-dark);color:#fff}
.btn-accent{background:var(--accent);border-color:var(--accent);color:#2b1d00}
.btn-accent:hover{background:#ffb703;border-color:#ffb703;color:#2b1d00}
.btn-ghost{background:transparent;color:var(--primary-dark)}
.btn-ghost:hover{background:var(--primary-soft);color:var(--primary-dark)}
.btn-row{display:flex;flex-wrap:wrap;gap:.7rem}

/* sections */
section{padding:2.6rem 0}
.hero{padding:2.2rem 0 2.8rem;background:linear-gradient(180deg,#e9f7f4 0,var(--bg) 100%)}
.hero-grid{display:grid;gap:1.6rem;align-items:center}
.lead{font-size:1.2rem;color:var(--muted)}
.eyebrow{display:inline-block;background:var(--primary-soft);color:var(--primary-dark);font-weight:700;font-size:.85rem;padding:.2rem .7rem;border-radius:999px;margin-bottom:.8rem}
.hero-art{display:none}
@media (min-width:820px){.hero-grid{grid-template-columns:1.2fr .8fr}.hero-art{display:block}}
.page-head{padding:2rem 0 1rem;background:linear-gradient(180deg,#e9f7f4 0,var(--bg) 100%)}
.page-head p{color:var(--muted);font-size:1.1rem;max-width:62ch}

.grid{display:grid;gap:1rem}
@media (min-width:640px){.grid.cols-2{grid-template-columns:1fr 1fr}.grid.cols-3{grid-template-columns:1fr 1fr 1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem 1.25rem;box-shadow:var(--shadow)}
.card h3{margin-top:.2rem}
.card .icon{font-size:1.8rem;line-height:1}
.card-feature{border-top:5px solid var(--primary)}
.card-feature:nth-child(2){border-top-color:var(--accent)}
.card-feature:nth-child(3){border-top-color:var(--coral)}
.tag{display:inline-block;font-size:.78rem;font-weight:700;border-radius:6px;padding:.1rem .5rem;background:var(--primary-soft);color:var(--primary-dark);margin-right:.3rem}
.tag-placeholder{background:#fff3bf;color:#5c4400}
.band{background:var(--primary-soft)}
.band-dark{background:var(--primary-dark);color:#fff}
.band-dark h2,.band-dark h3{color:#fff}
.band-dark a{color:#ffe08a}
.compare{display:grid;gap:1rem}
@media (min-width:640px){.compare{grid-template-columns:1fr 1fr}}
.compare .card .big{font-size:2.2rem;font-weight:800;color:var(--primary-dark);line-height:1.1}
.compare .card.tutor .big{color:#7a4a00}
.checklist{list-style:none;padding:0;margin:0 0 1rem}
.checklist li{padding-left:1.7rem;position:relative;margin-bottom:.45rem}
.checklist li::before{content:"✓";position:absolute;left:0;color:var(--good);font-weight:800}

/* forms */
label{font-weight:700;display:block;margin-bottom:.25rem}
input[type=email],input[type=text],select,textarea{width:100%;font:inherit;padding:.7rem .8rem;border:2px solid #b9b49f;border-radius:10px;background:#fff;color:var(--ink);min-height:46px}
textarea{min-height:140px}
input:focus,select:focus,textarea:focus{border-color:var(--primary);outline:3px solid #9fe0d8;outline-offset:0}
.signup{background:var(--surface);border:2px solid var(--primary);border-radius:var(--radius);padding:1.3rem;box-shadow:var(--shadow)}
.signup-row{display:flex;flex-direction:column;gap:.6rem}
@media (min-width:560px){.signup-row{flex-direction:row;align-items:stretch}.signup-row .field{flex:1}}
.form-msg{margin:.7rem 0 0;padding:.6rem .8rem;border-radius:8px;background:#fff3bf;color:#5c4400;font-size:.95rem}
.form-msg[hidden]{display:none}
.fineprint{font-size:.88rem;color:var(--muted);margin:.6rem 0 0}
.todo{font-size:.8rem;background:#fff3bf;color:#5c4400;border:1px dashed #d4b106;border-radius:6px;padding:.15rem .5rem;display:inline-block;margin-top:.5rem}
.form-grid{display:grid;gap:1rem}
.beehiiv-embed{margin:.8rem 0;min-height:60px}
.signup-fallback{margin:.4rem 0 0;font-size:.95rem}

/* faq */
details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:.8rem 1rem;margin-bottom:.6rem}
summary{cursor:pointer;font-weight:700}
details[open] summary{margin-bottom:.5rem}
details p{margin:0;color:var(--muted)}

/* decoder library */
.filters{display:grid;gap:.8rem;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1rem;margin-bottom:1rem}
@media (min-width:700px){.filters{grid-template-columns:1fr 1fr auto;align-items:end}}
.result-count{color:var(--muted);margin:.5rem 0 1rem}
.entry{display:flex;flex-direction:column;gap:.5rem}
.video-ph{aspect-ratio:16/9;background:repeating-linear-gradient(45deg,#eef3f2,#eef3f2 12px,#e2ebe9 12px,#e2ebe9 24px);border:2px dashed #8fb3ae;border-radius:10px;display:grid;place-items:center;text-align:center;color:#3c5a56;font-size:.9rem;padding:.5rem}
.say-it{background:#fff8e1;border-left:5px solid var(--accent);padding:.6rem .8rem;border-radius:8px;font-size:.98rem}
.say-it strong{display:block;font-size:.8rem;text-transform:uppercase;letter-spacing:.04em;color:var(--accent-dark)}

/* quiz */
.grade-picker{display:grid;grid-template-columns:repeat(5,1fr);gap:.5rem}
@media (max-width:420px){.grade-picker{grid-template-columns:repeat(3,1fr)}}
.grade-btn{padding:.9rem .3rem;border-radius:12px;border:2px solid var(--primary);background:#fff;color:var(--primary-dark);font:inherit;font-weight:800;font-size:1.05rem;cursor:pointer;min-height:56px}
.grade-btn:hover{background:var(--primary);color:#fff}
.progress{height:10px;background:#e8e4d6;border-radius:999px;overflow:hidden;margin:.6rem 0 1rem}
.progress>div{height:100%;background:var(--primary);width:0;transition:width .25s}
.q-text{font-size:1.35rem;font-weight:700;margin-bottom:1rem}
fieldset{border:0;padding:0;margin:0}
legend{padding:0}
.opt{display:flex;align-items:center;gap:.7rem;border:2px solid var(--line);background:#fff;border-radius:12px;padding:.8rem 1rem;margin-bottom:.6rem;cursor:pointer;font-weight:600;min-height:52px}
.opt:hover{border-color:var(--primary)}
.opt input{width:1.3rem;height:1.3rem;accent-color:var(--primary);flex:none}
.opt:has(input:checked){border-color:var(--primary);background:var(--primary-soft)}
.opt:has(input:focus-visible){outline:3px solid var(--accent)}
.quiz-nav{display:flex;justify-content:space-between;gap:.7rem;margin-top:1rem}
.score-big{font-size:3rem;font-weight:800;color:var(--primary-dark);line-height:1}
.area-row{margin:.9rem 0}
.area-head{display:flex;justify-content:space-between;gap:.6rem;font-weight:700;flex-wrap:wrap}
.bar{height:14px;background:#e8e4d6;border-radius:999px;overflow:hidden;margin-top:.3rem}
.bar>div{height:100%}
.lvl{font-size:.8rem;font-weight:800;padding:.1rem .55rem;border-radius:999px;color:#fff}
.lvl-strong{background:var(--good)}.lvl-mid{background:var(--warn)}.lvl-shaky{background:var(--bad)}
.bar .lvl-strong,.bar .lvl-mid,.bar .lvl-shaky{padding:0;border-radius:0}
.review li{margin-bottom:.6rem}
.review .wrong{color:var(--bad);font-weight:700}
.review .right{color:var(--good);font-weight:700}
.notice{background:var(--primary-soft);border-radius:10px;padding:.7rem 1rem;font-size:.95rem}

/* pricing */
.plans{display:grid;gap:1rem}
@media (min-width:700px){.plans{grid-template-columns:1fr 1fr}}
.plan{position:relative;display:flex;flex-direction:column}
.plan .price{font-size:2.6rem;font-weight:800;color:var(--primary-dark);line-height:1}
.plan .price small{font-size:1rem;font-weight:600;color:var(--muted)}
.plan.best{border:3px solid var(--accent)}
.plan .badge{position:absolute;top:-14px;right:14px;background:var(--accent);color:#2b1d00;font-weight:800;font-size:.8rem;padding:.2rem .7rem;border-radius:999px}
.plan .btn{margin-top:auto}

/* footer */
.site-footer{background:#10302f;color:#d7ebe8;padding:2rem 0;margin-top:2rem;font-size:.95rem}
.site-footer a{color:#fff}
.footer-grid{display:grid;gap:1.2rem}
@media (min-width:700px){.footer-grid{grid-template-columns:2fr 1fr 1fr}}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin-bottom:.35rem}
.site-footer h2{font-size:1rem;color:#fff;margin-bottom:.5rem}

@media print{
  .site-header,.site-footer,.preview-banner,.quiz-nav,.btn-row,.skip{display:none!important}
  body{background:#fff;font-size:12pt}
  section{padding:.8rem 0}
}