/* =============================================================================
   The Concurrent Method — sales page
   Premium, conversion-first, self-contained. Restrained palette + one accent.
   Mobile-first. CSS-only micro-interactions. No external dependencies.
   ============================================================================= */

:root{
  /* palette — deep near-black, cool greys, ONE warm accent */
  --bg:#0a0d12;
  --bg-2:#0e121a;
  --surface:#141923;
  --surface-2:#1b212d;
  --line:#262f3e;
  --line-soft:#1d2531;
  --ink:#eef2f8;
  --ink-2:#c5cedb;
  --muted:#8a97ac;
  --faint:#5e6a7d;
  --accent:#ff5a3c;          /* the single accent */
  --accent-hi:#ff6e54;
  --accent-soft:rgba(255,90,60,.13);
  --accent-line:rgba(255,90,60,.35);
  --green:#3fb27f;

  /* type scale (1.25 major-third-ish, tuned) */
  --t-xs:.78rem;
  --t-sm:.9rem;
  --t-base:1rem;
  --t-lg:1.15rem;
  --t-xl:1.5rem;
  --t-2xl:2rem;
  --t-3xl:2.75rem;
  --t-4xl:3.4rem;

  --maxw:1080px;
  --radius:16px;
  --radius-sm:11px;
  --shadow:0 24px 60px -24px rgba(0,0,0,.7);
  --shadow-glow:0 0 0 1px var(--accent-line), 0 20px 50px -20px rgba(255,90,60,.28);

  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font);
  font-size:var(--t-base);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;position:relative}
.narrow{max-width:760px}
.narrow-block{max-width:62ch;margin-left:auto;margin-right:auto}
.center{text-align:center}

h1,h2,h3{letter-spacing:-.03em;line-height:1.08;font-weight:800}
h2{font-size:clamp(1.6rem,4vw,var(--t-2xl));margin-bottom:14px}
h3{font-size:var(--t-lg);font-weight:700;letter-spacing:-.02em}
em{font-style:normal;color:var(--accent)}

.eyebrow{
  display:inline-block;color:var(--accent);font-weight:600;font-size:var(--t-xs);
  letter-spacing:.14em;text-transform:uppercase;margin-bottom:12px;
}
.eyebrow.center{display:block;text-align:center}

.lead{color:var(--ink-2);font-size:var(--t-lg);line-height:1.6}

/* ---------- buttons ---------- */
.btn{
  display:inline-block;font-family:inherit;font-weight:700;font-size:var(--t-base);
  border-radius:var(--radius-sm);padding:14px 26px;cursor:pointer;text-decoration:none;
  border:1px solid var(--line);background:var(--surface-2);color:var(--ink);
  transition:transform .14s ease,background .18s,border-color .18s,box-shadow .18s;
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{
  background:var(--accent);border-color:var(--accent);color:#240a04;
  box-shadow:0 10px 30px -10px rgba(255,90,60,.5);
}
.btn-primary:hover{background:var(--accent-hi);box-shadow:0 16px 40px -10px rgba(255,90,60,.6)}
.btn-lg{font-size:var(--t-lg);padding:17px 34px}
.btn.full{display:block;width:100%;text-align:center}
.btn-link{background:transparent;border-color:transparent;color:var(--muted);padding:14px 8px}
.btn-link:hover{color:var(--ink);transform:none}

/* ---------- sections ---------- */
.section{padding:90px 0;position:relative}
@media(max-width:640px){.section{padding:64px 0}}

/* ---------- HERO ---------- */
.hero{
  position:relative;padding:90px 0 80px;text-align:center;overflow:hidden;
  background:radial-gradient(120% 90% at 50% -10%,#141b27 0%,var(--bg) 55%);
  border-bottom:1px solid var(--line-soft);
}
.hero-glow{
  position:absolute;top:-180px;left:50%;transform:translateX(-50%);
  width:760px;height:420px;border-radius:50%;
  background:radial-gradient(closest-side,rgba(255,90,60,.18),transparent 70%);
  filter:blur(20px);pointer-events:none;z-index:0;
}
.hero .container{position:relative;z-index:1}
.badge{
  display:inline-block;font-size:var(--t-xs);font-weight:600;letter-spacing:.06em;
  color:var(--ink-2);background:var(--surface);border:1px solid var(--line);
  padding:7px 16px;border-radius:30px;margin-bottom:26px;
}
.hero-title{
  font-size:clamp(2rem,6vw,var(--t-4xl));margin:0 auto 22px;max-width:18ch;
}
.hero-sub{color:var(--ink-2);font-size:var(--t-lg);max-width:60ch;margin:0 auto 34px;line-height:1.6}
.hero-sub strong{color:var(--ink)}
.hero-cta{display:flex;flex-direction:column;align-items:center;gap:6px;margin-bottom:22px}
.hero-trust{color:var(--faint);font-size:var(--t-sm)}

/* ---------- PROBLEM ---------- */
.problem{background:var(--bg)}
.pain-list{list-style:none;margin:26px 0;display:flex;flex-direction:column;gap:16px}
.pain-list li{
  position:relative;padding:18px 20px 18px 54px;background:var(--surface);
  border:1px solid var(--line-soft);border-radius:var(--radius-sm);color:var(--ink-2);
}
.pain-list li strong{color:var(--ink)}
.pain-list li::before{
  content:"";position:absolute;left:20px;top:24px;width:14px;height:14px;border-radius:4px;
  background:var(--accent-soft);border:1px solid var(--accent-line);
}

/* ---------- SOLUTION / MECHANISM ---------- */
.solution{background:linear-gradient(180deg,var(--bg) 0%,var(--bg-2) 100%);border-block:1px solid var(--line-soft)}
.mech-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px;margin-top:42px;
}
.mech-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;
  transition:border-color .2s,transform .2s;
}
.mech-card:hover{border-color:var(--accent-line);transform:translateY(-3px)}
.mech-num{
  display:block;font-size:var(--t-sm);font-weight:800;color:var(--accent);
  letter-spacing:.1em;margin-bottom:14px;
}
.mech-card h3{margin-bottom:8px}
.mech-card p{color:var(--muted);font-size:var(--t-sm);line-height:1.6}

/* ---------- WHAT'S INSIDE ---------- */
.inside{background:var(--bg)}
.inside-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;margin-top:42px;
}
.inside-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;
  transition:border-color .2s,transform .2s;
}
.inside-card:hover{border-color:var(--accent-line);transform:translateY(-3px)}
.inside-card.feature{
  background:linear-gradient(160deg,#19212e,#141923);border-color:var(--accent-line);
  box-shadow:var(--shadow-glow);grid-column:1/-1;
}
@media(min-width:760px){.inside-card.feature{grid-column:span 2}}
.inside-tag{
  display:inline-block;font-size:var(--t-xs);font-weight:700;color:var(--accent);
  text-transform:uppercase;letter-spacing:.1em;margin-bottom:12px;
}
.inside-card h3{margin-bottom:8px}
.inside-card p{color:var(--muted);font-size:var(--t-sm);line-height:1.6}
.inside-card.feature p{color:var(--ink-2);font-size:var(--t-base)}

/* ---------- PRICING ---------- */
.pricing{background:linear-gradient(180deg,var(--bg-2),var(--bg));border-block:1px solid var(--line-soft)}
.price-card{
  margin-top:38px;display:grid;grid-template-columns:1fr;gap:0;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--shadow);
}
@media(min-width:780px){.price-card{grid-template-columns:1fr 1fr}}
.price-stack{background:var(--surface);padding:32px 28px}
.stack-row{
  display:flex;justify-content:space-between;gap:12px;padding:13px 0;
  border-bottom:1px solid var(--line-soft);color:var(--ink-2);font-size:var(--t-sm);
}
.stack-row span:last-child{color:var(--muted);font-variant-numeric:tabular-nums}
.stack-total{
  display:flex;justify-content:space-between;padding:16px 0 0;margin-top:6px;
  font-weight:800;color:var(--ink);font-size:var(--t-lg);
}
.stack-total span:last-child{color:var(--ink);font-variant-numeric:tabular-nums}
.price-now{
  background:linear-gradient(160deg,#1a222f,#12171f);padding:36px 28px;text-align:center;
  display:flex;flex-direction:column;justify-content:center;
}
.price-now .anchor{
  color:var(--faint);text-decoration:line-through;font-size:var(--t-lg);font-weight:600;margin-bottom:4px;
}
.price-big{font-size:var(--t-3xl);font-weight:800;letter-spacing:-.03em;line-height:1;margin-bottom:14px}
.price-big span{font-size:var(--t-base);font-weight:600;color:var(--muted);letter-spacing:0}
.price-context{color:var(--muted);font-size:var(--t-sm);margin-bottom:22px;line-height:1.55}
.price-urgency{color:var(--faint);font-size:var(--t-xs);margin-top:14px;line-height:1.5}

/* ---------- GUARANTEE ---------- */
.guarantee{background:var(--bg)}
.guarantee-seal{
  width:88px;height:88px;border-radius:50%;margin:0 auto 22px;
  display:flex;align-items:center;justify-content:center;
  font-size:2rem;font-weight:800;color:var(--accent);
  border:2px solid var(--accent-line);background:var(--accent-soft);
  position:relative;
}
.guarantee-seal::after{
  content:"DAY GUARANTEE";position:absolute;bottom:-22px;left:50%;transform:translateX(-50%);
  font-size:.58rem;font-weight:700;letter-spacing:.14em;color:var(--muted);white-space:nowrap;
}
.guarantee h2{margin-top:14px}
.guarantee .lead{margin:14px auto 0;max-width:60ch}
.guarantee .lead strong{color:var(--ink)}
.fine{color:var(--faint);font-size:var(--t-xs);margin-top:18px;max-width:56ch;margin-inline:auto;line-height:1.5}

/* ---------- FAQ ---------- */
.faq{background:linear-gradient(180deg,var(--bg),var(--bg-2));border-top:1px solid var(--line-soft)}
.faq details{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);
  margin-top:14px;overflow:hidden;transition:border-color .2s;
}
.faq details[open]{border-color:var(--accent-line)}
.faq summary{
  cursor:pointer;list-style:none;padding:20px 24px;font-weight:600;font-size:var(--t-base);
  color:var(--ink);position:relative;padding-right:52px;transition:color .15s;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"+";position:absolute;right:22px;top:50%;transform:translateY(-50%);
  font-size:1.4rem;font-weight:400;color:var(--accent);transition:transform .25s;
}
.faq details[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq summary:hover{color:var(--accent-hi)}
.faq details p{padding:0 24px 22px;color:var(--muted);font-size:var(--t-sm);line-height:1.65}
.faq details p em{color:var(--ink-2)}
.faq h2{margin-bottom:30px}

/* ---------- FINAL CTA ---------- */
.final-cta{
  background:radial-gradient(120% 100% at 50% 120%,#1a222f 0%,var(--bg) 60%);
  border-top:1px solid var(--line-soft);
}
.final-cta h2{max-width:20ch;margin-inline:auto}
.final-cta .lead{margin:14px auto 30px;max-width:48ch}
.final-cta .btn-lg{margin-bottom:8px}
.final-cta .btn-link{display:block;margin-top:6px}

/* ---------- FOOTER ---------- */
.site-footer{background:var(--bg-2);border-top:1px solid var(--line);padding:40px 0 56px}
.disclosure{color:var(--faint);font-size:var(--t-xs);line-height:1.6;margin-bottom:12px;max-width:90ch}
.disclosure strong{color:var(--muted)}
.copyright{color:var(--faint);font-size:var(--t-xs);margin-top:8px}

/* ---------- motion: respect reduced-motion ---------- */
@media(prefers-reduced-motion:reduce){
  *{transition:none!important;scroll-behavior:auto!important}
}

/* ---------- focus visibility (a11y) ---------- */
a:focus-visible,button:focus-visible,summary:focus-visible{
  outline:2px solid var(--accent);outline-offset:3px;border-radius:6px;
}