/* Shared stylesheet for the Adaptive Training public site (home + how-it-works + download + guide).
   Dark, GitHub-ish palette; one accent. Kept framework-free so the static nginx service (atp-www)
   serves it as-is. */
:root{
  /* Bright light — the default; dark follows the OS below (marketing site, no toggle). */
  --bg:#f4f6f8; --bg2:#ffffff; --surface:#ffffff; --surface2:#eef1f5;
  --border:#e5e8ee; --border2:#d3d9e1;
  --text:#0e1116; --text2:#3d4653; --text3:#667085;
  --accent:#2b44f0; --warn:#eab308;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"SF Mono",ui-monospace,"Cascadia Code",Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0e1116; --bg2:#161b22; --surface:#161b22; --surface2:#1c232c;
    --border:#29313c; --border2:#3a434f;
    --text:#e6eaf0; --text2:#aab3c0; --text3:#7d8794;
    --accent:#5b74ff; --warn:#f5c542;
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
.wrap{max-width:1040px;margin:0 auto;padding:0 24px}

/* intensity spectrum — the app's identity mark, as a thin rule across the very top */
body::before{content:"";position:fixed;top:0;left:0;right:0;height:3px;z-index:30;
  background:linear-gradient(90deg,#94a3b8,#14b8c4,#16a34a,#eab308,#f97316,#ef4444)}

header{border-bottom:1px solid var(--border);position:sticky;top:0;
  background:color-mix(in srgb,var(--bg) 86%,transparent);
  backdrop-filter:blur(8px);z-index:10}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{font-family:var(--sans);font-weight:800;letter-spacing:-.03em;font-size:19px;color:var(--text)}
.logo small{display:block;font-weight:400;font-size:11px;color:var(--text3);letter-spacing:.3px;margin-top:-2px}
nav a{color:var(--text2);margin-left:22px;font-size:14px}
nav a:hover{color:var(--text)}
nav a.here{color:var(--text)}

.btn{display:inline-block;padding:10px 18px;border-radius:8px;border:1px solid var(--border2);
  background:transparent;color:var(--text);font-weight:600;font-size:14px;
  transition:border-color .15s,background .15s;cursor:pointer}
.btn:hover{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{filter:brightness(.92)}
.btn[disabled],.btn.disabled{opacity:.5;cursor:not-allowed;pointer-events:none}

.hero{padding:80px 0 56px;text-align:center}
.hero h1{font-family:var(--sans);font-weight:800;font-size:clamp(34px,5vw,54px);line-height:1.0;margin:0 0 18px;letter-spacing:-.035em}
.hero h1 .accent{color:var(--accent)}
.hero p.lede{font-size:clamp(16px,2.2vw,20px);color:var(--text2);max-width:680px;margin:0 auto 32px}
.cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.tagchips{margin-top:26px;display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.tag{font-family:var(--mono);font-size:12px;color:var(--text3);border:1px solid var(--border);
  border-radius:20px;padding:4px 12px}
.tag.free{color:var(--accent);font-weight:600;border-color:color-mix(in srgb,var(--accent) 45%,var(--border));
  background:color-mix(in srgb,var(--accent) 8%,transparent)}

.preview{margin:18px auto 0;max-width:920px;border:1px solid var(--border);border-radius:12px;
  overflow:hidden;background:var(--surface);box-shadow:0 24px 60px -28px rgba(0,0,0,.7)}
.preview .bar{display:flex;gap:7px;padding:11px 14px;border-bottom:1px solid var(--border);background:var(--bg2)}
.preview .bar i{width:11px;height:11px;border-radius:50%;background:var(--border2)}
.preview img{display:block;width:100%}
.preview .ph{padding:60px 24px;text-align:center;color:var(--text3);font-family:var(--mono);font-size:13px}

section{padding:56px 0;border-top:1px solid var(--border)}
/* section label as a mono instrument label (matches the app's editorial system) */
h2.sec{font-family:var(--mono);font-size:12px;text-transform:uppercase;letter-spacing:.16em;color:var(--accent);margin:0 0 10px;font-weight:600}
.sec-lede{font-family:var(--sans);font-size:26px;font-weight:700;margin:0 0 36px;letter-spacing:-.02em}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:22px}
.card h3{margin:0 0 8px;font-size:16px}
.card p{margin:0;color:var(--text2);font-size:14px}
.card .ico{color:var(--accent);display:block;height:26px;margin-bottom:12px}
.card .ico svg{width:26px;height:26px;display:block}

.split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.split ul{margin:0;padding-left:0;list-style:none}
.split li{padding:10px 0;border-bottom:1px solid var(--border);color:var(--text2);font-size:15px}
.split li b{color:var(--text);font-weight:600}
.split li:last-child{border-bottom:none}
.note-card{background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:22px;font-size:14px;color:var(--text2)}
.note-card b{color:var(--text)}

.beta{background:var(--surface2);border:1px solid var(--border);border-radius:10px;
  padding:20px 24px;display:flex;gap:14px;align-items:flex-start;font-size:14px;color:var(--text2)}
.beta .dot{flex:none;width:9px;height:9px;border-radius:50%;background:var(--warn);margin-top:6px}
.beta b{color:var(--text)}

footer{border-top:1px solid var(--border);padding:32px 0;color:var(--text3);font-size:13px;text-align:center}
footer a{color:var(--text2)}
footer .links{margin-bottom:10px}
footer .links a{margin:0 9px}

/* ---------- inner pages (how-it-works, download, guide) ---------- */
.page-hero{padding:56px 0 34px}
.crumbs{font-size:13px;color:var(--text3);margin:0 0 14px;font-family:var(--mono)}
.crumbs a{color:var(--text2)}
.page-hero h1{font-family:var(--sans);font-weight:800;font-size:clamp(30px,4.2vw,46px);line-height:1.02;margin:0 0 14px;letter-spacing:-.035em}
.page-hero .lede{font-size:clamp(16px,2vw,19px);color:var(--text2);max-width:720px;margin:0}

.prose{max-width:760px}
.prose h2{font-family:var(--sans);font-weight:600;font-size:24px;letter-spacing:-.015em;margin:44px 0 10px}
.prose h3{font-size:17px;margin:26px 0 8px}
.prose p{color:var(--text2);margin:0 0 14px}
.prose ul,.prose ol{color:var(--text2);padding-left:20px;margin:0 0 14px}
.prose li{margin:6px 0}
.prose li b,.prose p b,.prose strong{color:var(--text)}
.prose code{font-family:var(--mono);font-size:.88em;background:var(--surface2);border:1px solid var(--border);
  border-radius:5px;padding:1px 6px;color:var(--text)}
.prose a:hover{text-decoration:underline}

.callout{background:var(--surface2);border:1px solid var(--border);border-left:3px solid var(--accent);
  border-radius:8px;padding:16px 18px;margin:20px 0;font-size:14px;color:var(--text2)}
.callout b{color:var(--text)}

.methods{display:grid;gap:16px;margin:8px 0 0}
.method{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:20px 22px}
.method h3{margin:0 0 6px;font-size:17px;display:flex;align-items:baseline;gap:10px}
.method h3 .n{font-family:var(--mono);font-size:13px;color:var(--accent);font-weight:700}
.method p{margin:0;color:var(--text2);font-size:14px}
.method p+p{margin-top:8px}

.dlgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:8px 0 0}
.dl{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:24px 22px;text-align:center;
  display:flex;flex-direction:column;position:relative}
.dl .os{color:var(--text);height:30px;margin-bottom:10px;display:flex;justify-content:center;align-items:center}
.dl .os svg{width:30px;height:30px;display:block}
.dl h3{margin:0 0 4px;font-size:16px}
.dl .meta{color:var(--text3);font-size:12px;font-family:var(--mono);margin-bottom:16px}
.dl .btn{width:100%}
.dl .btn:first-of-type{margin-top:auto}   /* bottom-align the CTA block across cards */
.dl .badge{position:absolute;top:14px;right:14px;margin:0}   /* corner ribbon — doesn't shove the title down */
.badge{display:inline-block;font-family:var(--mono);font-size:11px;color:var(--text3);border:1px solid var(--border);
  border-radius:20px;padding:3px 10px;margin-bottom:12px}

.cardlink{display:block;background:var(--surface);border:1px solid var(--border);border-radius:10px;
  padding:20px;transition:border-color .15s}
.cardlink:hover{border-color:var(--accent)}
.cardlink h3{margin:0 0 6px;font-size:16px;color:var(--text)}
.cardlink p{margin:0;color:var(--text2);font-size:14px}

/* screenshot figure (in guide / how-it-works prose) — mirrors the home hero frame */
.shot{margin:20px 0 6px;border:1px solid var(--border);border-radius:10px;overflow:hidden;
  background:var(--surface);box-shadow:0 16px 40px -24px rgba(0,0,0,.7)}
.shot .bar{display:flex;gap:7px;padding:10px 13px;border-bottom:1px solid var(--border);background:var(--bg2)}
.shot .bar i{width:10px;height:10px;border-radius:50%;background:var(--border2)}
.shot img{display:block;width:100%}

/* ---------- download waiver (modal on /download/ + standalone gate on /download/go/*) ---------- */
.modal-backdrop{position:fixed;inset:0;background:rgba(6,9,14,.66);backdrop-filter:blur(6px);
  z-index:100;display:none;align-items:center;justify-content:center;padding:24px}
.modal-backdrop.open{display:flex}

/* full-page centering for the standalone gate on the /go/ redirect pages */
.waiver-stage{min-height:calc(100vh - 3px);display:flex;align-items:center;justify-content:center;padding:40px 24px}
.waiver-stage[hidden]{display:none}   /* the class's display:flex would otherwise defeat [hidden] */
.waiver-stage .go-note{text-align:center;max-width:520px}
.waiver-stage .go-note h1{font-size:clamp(24px,3vw,30px);font-weight:800;letter-spacing:-.025em;margin:0 0 12px}

.waiver-card{position:relative;overflow:hidden;text-align:left;background:var(--surface);
  border:1px solid var(--border);border-radius:16px;max-width:560px;width:100%;max-height:88vh;
  padding:34px 34px 28px;box-shadow:0 34px 90px -30px rgba(0,0,0,.85)}
/* brand spectrum rail across the top edge of the card — the app's identity mark */
.waiver-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,#94a3b8,#14b8c4,#16a34a,#eab308,#f97316,#ef4444)}
/* faint warn-tinted glow behind the header, so the caution reads at a glance */
.waiver-card::after{content:"";position:absolute;top:0;left:0;right:0;height:130px;pointer-events:none;
  background:radial-gradient(120% 100% at 12% 0%,color-mix(in srgb,var(--warn) 16%,transparent),transparent 70%)}
.waiver-card>*{position:relative;z-index:1}

.waiver-label{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;
  text-transform:uppercase;letter-spacing:.15em;color:var(--warn);font-weight:700;margin:2px 0 12px}
.waiver-label svg{width:17px;height:17px;flex:none}

.waiver-card h1,.waiver-card h2{font-family:var(--sans);font-weight:800;font-size:26px;
  letter-spacing:-.03em;line-height:1.08;margin:0 0 16px;color:var(--text)}
.waiver-card p{color:var(--text2);font-size:15px;line-height:1.62;margin:0 0 13px}
.waiver-card p:last-of-type{margin-bottom:0}
.waiver-card p b{color:var(--text)}
.waiver-card .waiver-risk{color:var(--warn);font-weight:700}

.waiver-actions{display:flex;gap:12px;justify-content:flex-end;flex-wrap:wrap;
  margin-top:24px;padding-top:20px;border-top:1px solid var(--border)}
.waiver-actions .btn{width:auto;padding:11px 20px}
.waiver-actions .btn.primary{box-shadow:0 10px 24px -10px color-mix(in srgb,var(--accent) 85%,transparent)}
/* narrow screens: stack full-width with the primary action on top */
@media(max-width:520px){
  .waiver-actions{flex-direction:column-reverse;align-items:stretch}
  .waiver-actions .btn{width:100%;text-align:center}
}

@media(max-width:720px){.split{grid-template-columns:1fr}nav a:not(.btn){display:none}}