/* =========================================================================
   Modern CPR — design system
   Brand: clinical teal + disciplined pulse-red on a cool neutral.
   Type:  Bricolage Grotesque (display) / Hanken Grotesk (body) / IBM Plex Mono (data)
   Themes: light (default), dark via prefers-color-scheme, and explicit [data-theme].
   ========================================================================= */

/* ---- Tokens: light (default) ---- */
:root {
  --ground:#F3F6F7;
  --surface:#FFFFFF;
  --surface-2:#E9EFF0;
  --ink:#0D1E22;
  --ink-2:#3C5257;
  --muted:#67797E;
  --line:#DCE5E7;
  --line-2:#C8D5D8;

  --brand:#0A6F7C;
  --brand-strong:#075662;
  --brand-tint:#E1F0F1;
  --on-brand:#FFFFFF;

  --pulse:#E23B42;
  --pulse-strong:#C22F36;
  --pulse-tint:#FCE7E7;

  --good:#0F8A66;
  --good-tint:#E2F3EC;
  --warn:#B26A00;
  --warn-tint:#F7EDD9;

  --focus:#1AA0B1;
  --shadow: 0 1px 2px rgba(13,30,34,.06), 0 14px 34px -18px rgba(13,30,34,.26);
  --shadow-sm: 0 1px 2px rgba(13,30,34,.08);

  --r-sm:8px; --r:12px; --r-lg:18px; --r-xl:26px; --r-pill:999px;

  --font-display:'Bricolage Grotesque',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-body:'Hanken Grotesk',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,'SF Mono',Menlo,Consolas,monospace;

  --fs-display:clamp(2.5rem,1.5rem + 3.4vw,4rem);
  --fs-h1:clamp(1.95rem,1.35rem + 2.2vw,2.9rem);
  --fs-h2:clamp(1.5rem,1.2rem + 1.2vw,2.05rem);
  --fs-h3:1.25rem;
  --fs-lead:clamp(1.06rem,1rem + .4vw,1.24rem);
  --fs-body:1.0625rem;
  --fs-small:.9375rem;
  --fs-label:.72rem;

  --maxw:1120px;
  --gutter:clamp(1.1rem,4vw,2.5rem);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground:#071417;
    --surface:#0E1E22;
    --surface-2:#15292F;
    --ink:#E9F2F3;
    --ink-2:#AFC4C8;
    --muted:#7F969B;
    --line:#20363B;
    --line-2:#2C464C;

    --brand:#39BFCE;
    --brand-strong:#63D3DF;
    --brand-tint:#0F2E34;
    --on-brand:#04191D;

    --pulse:#FF5C63;
    --pulse-strong:#FF7B81;
    --pulse-tint:#2A1315;

    --good:#3BC08E;
    --good-tint:#0F2A24;
    --warn:#E0A44A;
    --warn-tint:#2A2213;

    --focus:#48CDDD;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 16px 40px -18px rgba(0,0,0,.7);
    --shadow-sm: 0 1px 2px rgba(0,0,0,.5);
  }
}

:root[data-theme="dark"] {
  --ground:#071417;
  --surface:#0E1E22;
  --surface-2:#15292F;
  --ink:#E9F2F3;
  --ink-2:#AFC4C8;
  --muted:#7F969B;
  --line:#20363B;
  --line-2:#2C464C;

  --brand:#39BFCE;
  --brand-strong:#63D3DF;
  --brand-tint:#0F2E34;
  --on-brand:#04191D;

  --pulse:#FF5C63;
  --pulse-strong:#FF7B81;
  --pulse-tint:#2A1315;

  --good:#3BC08E;
  --good-tint:#0F2A24;
  --warn:#E0A44A;
  --warn-tint:#2A2213;

  --focus:#48CDDD;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 16px 40px -18px rgba(0,0,0,.7);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.5);
}

/* ---- Reset / base ---- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}
body{
  margin:0;
  background:var(--ground);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:var(--fs-body);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.1;color:var(--ink);margin:0 0 .5em;text-wrap:balance}
h1{font-size:var(--fs-h1)}
h2{font-size:var(--fs-h2)}
h3{font-size:var(--fs-h3);line-height:1.25}
p{margin:0 0 1rem;max-width:66ch}
a{color:var(--brand-strong);text-decoration-thickness:1px;text-underline-offset:2px}
a:hover{color:var(--brand)}
img,svg{max-width:100%;height:auto;display:block}
strong{font-weight:700;color:var(--ink)}
ul,ol{margin:0 0 1rem;padding-left:1.2em}
li{margin:.3em 0}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:4px}

/* ---- Layout ---- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(3rem,7vw,5.5rem)}
.section--tight{padding-block:clamp(2rem,5vw,3.5rem)}
.section--alt{background:var(--surface)}
.stack{display:flex;flex-direction:column;gap:1rem}
.grid{display:grid;gap:clamp(1rem,2.4vw,1.6rem)}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr))}
.center{text-align:center;margin-inline:auto}
.center p{margin-inline:auto}
.lead{font-size:var(--fs-lead);color:var(--ink-2);line-height:1.6}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---- Eyebrow / labels ---- */
.eyebrow{
  font-family:var(--font-mono);font-size:var(--fs-label);font-weight:600;
  letter-spacing:.14em;text-transform:uppercase;color:var(--brand);
  display:inline-flex;align-items:center;gap:.5em;margin:0 0 .9rem;
}
.eyebrow::before{content:"";width:1.6em;height:2px;background:var(--brand);border-radius:2px}
.center .eyebrow{justify-content:center}

/* ---- Skip link ---- */
.skip{position:absolute;left:.6rem;top:-3rem;z-index:200;background:var(--brand);color:var(--on-brand);
  padding:.6rem 1rem;border-radius:var(--r-sm);font-weight:600;transition:top .15s}
.skip:focus{top:.6rem;color:var(--on-brand)}

/* ---- Header / nav ---- */
.site-header{position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--ground) 86%,transparent);
  backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:1rem;min-height:64px}
.brand{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--font-display);font-weight:800;
  font-size:1.2rem;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
.brand:hover{color:var(--ink)}
.brand .mark{width:30px;height:30px;flex:0 0 auto}
.brand b{color:var(--brand)}
.nav-links{display:flex;align-items:center;gap:.35rem;margin-left:auto}
#site-nav{display:flex;align-items:center;gap:.15rem}
#site-nav a{color:var(--ink-2);text-decoration:none;font-weight:600;font-size:var(--fs-small);
  padding:.5rem .7rem;border-radius:var(--r-sm)}
#site-nav a:hover{color:var(--ink);background:var(--surface-2)}
.nav-tools{display:flex;align-items:center;gap:.5rem;margin-left:.4rem}
.icon-btn{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:var(--r-sm);
  border:1px solid var(--line);background:var(--surface);color:var(--ink-2);cursor:pointer}
.icon-btn:hover{color:var(--ink);border-color:var(--line-2)}
.icon-btn svg{width:20px;height:20px}
.theme-toggle .moon{display:none}
:root[data-theme="dark"] .theme-toggle .sun{display:none}
:root[data-theme="dark"] .theme-toggle .moon{display:block}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .theme-toggle .sun{display:none}
  :root:not([data-theme="light"]) .theme-toggle .moon{display:block}
}
.nav-toggle{display:none}

@media (max-width:860px){
  .nav-toggle{display:inline-grid}
  #site-nav{position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:.1rem;
    background:var(--surface);border-bottom:1px solid var(--line);padding:.6rem var(--gutter) 1rem;
    box-shadow:var(--shadow);display:none}
  #site-nav.open{display:flex}
  #site-nav a{padding:.7rem .6rem;font-size:1rem}
  .nav-links{margin-left:auto}
}

/* ---- Buttons ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font-family:var(--font-body);font-weight:700;font-size:1rem;line-height:1;
  padding:.85em 1.35em;border-radius:var(--r-pill);border:1px solid transparent;cursor:pointer;
  text-decoration:none;transition:transform .12s ease, box-shadow .15s ease, background .15s ease;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--brand);color:var(--on-brand);box-shadow:var(--shadow-sm)}
.btn-primary:hover{background:var(--brand-strong);color:var(--on-brand);box-shadow:var(--shadow)}
.btn-pulse{background:var(--pulse);color:#fff}
.btn-pulse:hover{background:var(--pulse-strong);color:#fff}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn-ghost:hover{background:var(--surface-2);color:var(--ink)}
.btn-lg{font-size:1.06rem;padding:1em 1.6em}
.btn svg{width:18px;height:18px}
.btn-row{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}
.center .btn-row{justify-content:center}

/* ---- Chips ---- */
.chips{display:flex;flex-wrap:wrap;gap:.5rem}
.center .chips{justify-content:center}
.chip{display:inline-flex;align-items:center;gap:.45em;font-size:var(--fs-small);font-weight:600;color:var(--ink-2);
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-pill);padding:.4em .8em}
.chip svg{width:15px;height:15px;color:var(--brand)}
.tag{display:inline-block;font-family:var(--font-mono);font-size:.66rem;font-weight:600;letter-spacing:.08em;
  text-transform:uppercase;color:var(--pulse-strong);background:var(--pulse-tint);border-radius:var(--r-pill);
  padding:.28em .6em;vertical-align:middle}
.tag--new{color:var(--brand-strong);background:var(--brand-tint)}

/* ---- Hero ---- */
.hero{position:relative;overflow:hidden;padding-block:clamp(2.6rem,6vw,5rem)}
.hero-grid{display:grid;gap:clamp(1.6rem,4vw,3rem);grid-template-columns:1.05fr .95fr;align-items:center}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr}}
.hero h1{font-size:var(--fs-display);letter-spacing:-.02em;margin-bottom:.4em}
.hero .lead{max-width:36ch}
.hero .btn-row{margin-top:1.6rem}
.hero .chips{margin-top:1.5rem}

/* ECG monitor card */
.monitor{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-xl);
  box-shadow:var(--shadow);padding:1.4rem;overflow:hidden}
.monitor::before{content:"";position:absolute;inset:0;background:
  radial-gradient(120% 90% at 90% 0%,color-mix(in srgb,var(--brand) 12%,transparent),transparent 60%);pointer-events:none}
.monitor-top{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:.6rem;position:relative}
.monitor-bpm{font-family:var(--font-mono);font-weight:600;color:var(--pulse);font-size:1.9rem;line-height:1;
  font-variant-numeric:tabular-nums;display:flex;align-items:baseline;gap:.3em}
.monitor-bpm small{font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:600}
.monitor-heart{width:22px;height:22px;color:var(--pulse);animation:beat 1.05s ease-in-out infinite}
.monitor-label{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.ecg{display:block;width:100%;height:120px}
.ecg-grid{stroke:var(--line);stroke-width:1;opacity:.5}
.ecg-trace{fill:none;stroke:var(--pulse);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;
  filter:drop-shadow(0 0 6px color-mix(in srgb,var(--pulse) 55%,transparent))}
.ecg-sweep{stroke-dasharray:260;stroke-dashoffset:260;animation:sweep 2.4s linear infinite}
.monitor-foot{display:flex;flex-wrap:wrap;gap:.6rem 1.2rem;margin-top:.7rem;position:relative}
.metric{display:flex;flex-direction:column}
.metric b{font-family:var(--font-mono);font-weight:600;font-size:1.05rem;color:var(--ink);font-variant-numeric:tabular-nums}
.metric span{font-size:.72rem;color:var(--muted);letter-spacing:.02em}

@keyframes beat{0%,60%,100%{transform:scale(1)}30%{transform:scale(1.22)}}
@keyframes sweep{to{stroke-dashoffset:-260}}
@media (prefers-reduced-motion: reduce){
  .monitor-heart{animation:none}
  .ecg-sweep{animation:none;stroke-dashoffset:0}
}

/* ---- Cards ---- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:1.5rem;
  box-shadow:var(--shadow-sm);height:100%}
.card h3{margin-bottom:.35rem}
.card p{color:var(--ink-2);font-size:var(--fs-small);margin-bottom:0}
.card-ico{width:44px;height:44px;border-radius:var(--r);display:grid;place-items:center;
  background:var(--brand-tint);color:var(--brand-strong);margin-bottom:1rem}
.card-ico svg{width:24px;height:24px}
.topic .card-ico{background:var(--pulse-tint);color:var(--pulse-strong)}

/* feature list */
.feature{display:flex;gap:1rem;align-items:flex-start}
.feature .fico{flex:0 0 auto;width:40px;height:40px;border-radius:var(--r);display:grid;place-items:center;
  background:var(--brand-tint);color:var(--brand-strong)}
.feature .fico svg{width:22px;height:22px}
.feature h3{font-size:1.1rem;margin-bottom:.2rem}
.feature p{margin-bottom:0;color:var(--ink-2);font-size:var(--fs-small)}

/* numbered steps */
.steps{counter-reset:step;display:grid;gap:1.2rem}
.step{display:flex;gap:1rem;align-items:flex-start;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:1.3rem 1.5rem;box-shadow:var(--shadow-sm)}
.step::before{counter-increment:step;content:counter(step);flex:0 0 auto;width:38px;height:38px;border-radius:50%;
  display:grid;place-items:center;background:var(--brand);color:var(--on-brand);font-family:var(--font-mono);font-weight:600}
.step h3{margin-bottom:.2rem;font-size:1.12rem}
.step p{margin-bottom:0;color:var(--ink-2);font-size:var(--fs-small)}

/* ---- Callout / honesty ---- */
.callout{border:1px solid var(--line);border-left:4px solid var(--brand);background:var(--surface);
  border-radius:var(--r);padding:1.2rem 1.4rem}
.callout--note{border-left-color:var(--brand)}
.callout--check{border-left-color:var(--good)}
.callout--warn{border-left-color:var(--warn)}
.callout h3{font-size:1.05rem;margin-bottom:.35rem}
.callout p:last-child{margin-bottom:0}
.two-col-list{display:grid;gap:1.2rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr))}
.tick,.cross{list-style:none;padding-left:0}
.tick li,.cross li{position:relative;padding-left:1.8em;margin:.5em 0;color:var(--ink-2)}
.tick li::before{content:"";position:absolute;left:0;top:.42em;width:1.1em;height:1.1em;border-radius:50%;
  background:var(--good-tint);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230F8A66' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");
  background-size:.72em;background-repeat:no-repeat;background-position:center}
.cross li::before{content:"";position:absolute;left:0;top:.42em;width:1.1em;height:1.1em;border-radius:50%;
  background:var(--pulse-tint);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23C22F36' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 6 6 18M6 6l12 12'/%3E%3C/svg%3E");
  background-size:.7em;background-repeat:no-repeat;background-position:center}

/* ---- Pricing ---- */
.price-card{max-width:440px;margin-inline:auto;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-xl);box-shadow:var(--shadow);overflow:hidden}
.price-head{padding:1.6rem 1.8rem 1.2rem;border-bottom:1px solid var(--line);background:
  linear-gradient(180deg,var(--brand-tint),transparent)}
.price-amt{font-family:var(--font-display);font-weight:800;font-size:3.2rem;line-height:1;color:var(--ink);
  font-variant-numeric:tabular-nums}
.price-amt sup{font-size:1.3rem;font-weight:700;top:-1.1em;margin-right:.05em}
.price-amt small{font-size:.9rem;font-weight:600;color:var(--muted);font-family:var(--font-body)}
.price-body{padding:1.4rem 1.8rem 1.9rem}
.price-body .tick li{color:var(--ink)}
.price-body .btn{width:100%;margin-top:.6rem}
.price-note{font-size:var(--fs-small);color:var(--muted);text-align:center;margin-top:.9rem}

/* ---- FAQ ---- */
.faq{max-width:760px;margin-inline:auto;display:grid;gap:.7rem}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.faq summary{cursor:pointer;list-style:none;padding:1.05rem 1.3rem;font-weight:700;color:var(--ink);
  display:flex;justify-content:space-between;align-items:center;gap:1rem;font-size:1.02rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--font-mono);font-size:1.4rem;color:var(--brand);line-height:1;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq .faq-a{padding:0 1.3rem 1.2rem;color:var(--ink-2)}
.faq .faq-a p:last-child{margin-bottom:0}

/* ---- Banner CTA ---- */
.cta-band{background:var(--brand);color:var(--on-brand);border-radius:var(--r-xl);padding:clamp(2rem,5vw,3.2rem);
  text-align:center;position:relative;overflow:hidden}
.cta-band h2{color:var(--on-brand)}
.cta-band p{color:color-mix(in srgb,var(--on-brand) 82%,var(--brand));margin-inline:auto}
.cta-band .btn-primary{background:var(--on-brand);color:var(--brand-strong)}
.cta-band .btn-primary:hover{background:color-mix(in srgb,var(--on-brand) 90%,#000)}

/* ---- Footer ---- */
.site-footer{background:var(--surface);border-top:1px solid var(--line);padding-block:2.6rem 2rem;margin-top:2rem}
.footer-grid{display:grid;gap:2rem;grid-template-columns:1.4fr 1fr 1fr 1fr}
@media (max-width:760px){.footer-grid{grid-template-columns:1fr 1fr}}
@media (max-width:480px){.footer-grid{grid-template-columns:1fr}}
.footer-col h4{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--muted);margin-bottom:.9rem;font-weight:600}
.footer-col a{display:block;color:var(--ink-2);text-decoration:none;font-size:var(--fs-small);padding:.28em 0}
.footer-col a:hover{color:var(--brand)}
.footer-brand p{font-size:var(--fs-small);color:var(--muted);max-width:34ch}
.footer-disclaimer{border-top:1px solid var(--line);margin-top:2rem;padding-top:1.4rem;
  font-size:.82rem;color:var(--muted);line-height:1.6}
.footer-disclaimer p{max-width:none}
.footer-legal{display:flex;flex-wrap:wrap;gap:.4rem 1.1rem;margin-top:1rem;font-size:.82rem}
.footer-legal a{color:var(--muted);text-decoration:none}
.footer-legal a:hover{color:var(--brand)}

/* ---- Reveal on scroll ---- */
html.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
html.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){html.js .reveal{opacity:1;transform:none;transition:none}}

/* ---- Prose (legal/content pages) ---- */
.prose{max-width:72ch;margin-inline:auto}
.prose h2{margin-top:2.2rem}
.prose h3{margin-top:1.6rem}
.prose ul{padding-left:1.3em}
.page-head{padding-block:clamp(2rem,5vw,3.4rem);border-bottom:1px solid var(--line);background:var(--surface)}
.page-head .container{max-width:72ch}
.updated{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}