:root{
  /* ATEROSTOP official palette (app_colors.dart) */
  --bg:#F8FAFA;            /* Background (soft white) */
  --bg2:#ffffff;
  --panel:#FFFFFF;         /* Surface */
  --panel2:#F2F9F9;        /* soft turquoise tint */
  --line:#E3ECEC;          /* border */
  --text:#1A202C;          /* Text Primary (dark gray) */
  --muted:#718096;         /* Text Secondary */
  --muted2:#9CA3AF;        /* Text Tertiary / disabled */
  --teal:#06D7D7;          /* Primary (turquoise) */
  --teal-dark:#05B5B5;     /* Primary Dark */
  --teal-light:#E1FBFB;    /* Primary Light */
  --red:#A30021;           /* Accent (deep red) */
  --red-light:#FFE5E9;     /* Accent Light */
  --red2:#C21842;
  --success:#10B981;       /* Success */
  --success-light:#D1FAE5;
  --warning:#F59E0B;
  --warning-light:#FEF3C7;
  --dark-bg:#0F172A;       /* Dark bg (measurement screen) */
  --dark-surface:#1E293B;
  --dark-border:#334155;
  --grad:linear-gradient(135deg,#06D7D7 0%,#05B5B5 100%);
  --grad-heart:linear-gradient(135deg,#A30021 0%,#C21842 100%);
  --radius:18px;
  --shadow:0 18px 50px rgba(26,32,44,.08);
  --shadow-soft:0 8px 24px rgba(5,181,181,.14);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Segoe UI',system-ui,-apple-system,'Inter',sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
.container{max-width:1160px;margin:0 auto;padding:0 24px}
section{padding:88px 0;position:relative}

/* ---------- BG decorations ---------- */
.bg-grid{
  position:fixed;inset:0;z-index:-2;pointer-events:none;
  background-image:
    radial-gradient(circle at 82% -8%,rgba(6,215,215,.14),transparent 45%),
    radial-gradient(circle at 8% 28%,rgba(163,0,33,.06),transparent 40%),
    radial-gradient(circle at 50% 115%,rgba(6,215,215,.10),transparent 48%);
}
.bg-grid::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(6,215,215,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(6,215,215,.05) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(circle at 50% 18%,#000 0%,transparent 75%);
}

/* ---------- Nav ---------- */
nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:rgba(255,255,255,.82);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.5px;font-size:19px;color:var(--text)}
.brand img{height:34px;width:34px;border-radius:9px}
.brand span b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;gap:30px;color:var(--muted);font-size:15px;font-weight:500}
.nav-links a:hover{color:var(--teal-dark)}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:15px;padding:11px 22px;border-radius:12px;border:1px solid transparent;cursor:pointer;transition:.2s;white-space:nowrap}
.btn-primary{background:var(--grad);color:#052a2a;box-shadow:var(--shadow-soft)}
.btn-primary:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn-ghost{border-color:var(--line);color:var(--text);background:#fff}
.btn-ghost:hover{border-color:var(--teal);box-shadow:var(--shadow-soft)}
.btn-heart{background:var(--grad-heart);color:#fff;box-shadow:0 8px 24px rgba(163,0,33,.26)}
.btn-heart:hover{filter:brightness(1.06);transform:translateY(-1px)}

/* ---------- Hero ---------- */
.hero{padding:96px 0 64px;text-align:center}
.pill{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border:1px solid rgba(6,215,215,.5);border-radius:999px;font-size:13px;color:var(--teal-dark);background:var(--teal-light);margin-bottom:26px;font-weight:600}
.pill .dot{width:8px;height:8px;border-radius:50%;background:var(--teal);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(6,215,215,.5)}50%{box-shadow:0 0 0 7px rgba(6,215,215,0)}}
.hero h1{font-size:clamp(40px,6vw,68px);line-height:1.08;font-weight:800;letter-spacing:-1px;margin-bottom:22px;color:var(--text)}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(17px,2vw,21px);color:var(--muted);max-width:720px;margin:0 auto 36px}
.hero .cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero-ecg{max-width:640px;margin:52px auto 0;opacity:.9}

/* ECG wave trace */
.ecg{width:100%;height:120px}
.ecg path{stroke:url(#ecgGrad);stroke-width:2.6;fill:none;stroke-linecap:round;stroke-linejoin:round}

/* ---------- Metrics strip ---------- */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:70px}
.metric{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px;text-align:left;box-shadow:0 10px 30px rgba(26,32,44,.04)}
.metric .ic{font-size:26px;margin-bottom:12px}
.metric h3{font-size:26px;font-weight:800;color:var(--teal-dark)}
.metric h3 small{font-size:14px;color:var(--muted);font-weight:600}
.metric p{color:var(--muted);font-size:14px;margin-top:4px}

/* ---------- Sections ---------- */
.sec-head{text-align:center;max-width:680px;margin:0 auto 56px}
.sec-head .tag{display:inline-block;font-size:13px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--teal-dark);margin-bottom:14px}
.sec-head h2{font-size:clamp(30px,4vw,44px);font-weight:800;letter-spacing:-.5px;margin-bottom:16px;line-height:1.15;color:var(--text)}
.sec-head p{color:var(--muted);font-size:17px}

/* Features grid */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:30px;transition:.25s;position:relative;overflow:hidden;box-shadow:0 10px 30px rgba(26,32,44,.04)}
.card:hover{transform:translateY(-5px);border-color:rgba(6,215,215,.55);box-shadow:var(--shadow)}
.card .num{position:absolute;top:20px;right:24px;font-size:44px;font-weight:800;color:rgba(6,215,215,.16)}
.card .ic{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;font-size:24px;margin-bottom:18px}
.card.b1 .ic{background:var(--teal-light)}
.card.b2 .ic{background:rgba(6,215,215,.16)}
.card.b3 .ic{background:var(--red-light)}
.card h3{font-size:20px;margin-bottom:10px;color:var(--text)}
.card p{color:var(--muted);font-size:15px}
.card ul{list-style:none;margin-top:16px;display:grid;gap:8px}
.card ul li{font-size:14px;color:var(--muted);display:flex;gap:9px;align-items:flex-start}
.card ul li::before{content:"✓";color:var(--success);font-weight:800}

/* How it works steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:30px;text-align:center;position:relative;box-shadow:0 10px 30px rgba(26,32,44,.04)}
.step .step-n{width:46px;height:46px;margin:0 auto 18px;border-radius:50%;background:var(--grad);display:grid;place-items:center;font-weight:800;font-size:20px;color:#052a2a}
.step h3{font-size:19px;margin-bottom:9px;color:var(--text)}
.step p{color:var(--muted);font-size:15px}

/* Params / CTA band */
.band{background:linear-gradient(135deg,var(--teal-light),rgba(255,229,233,.6));border:1px solid rgba(6,215,215,.4);border-radius:24px;padding:56px;text-align:center}
.band h2{font-size:clamp(28px,4vw,42px);font-weight:800;margin-bottom:14px;color:var(--text)}
.band p{color:var(--muted);font-size:18px;max-width:600px;margin:0 auto 30px}
.params{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-bottom:40px}
.chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:9px 18px;font-size:14px;font-weight:600;color:var(--text);box-shadow:0 5px 16px rgba(26,32,44,.05)}
.chip b{color:var(--red)}

/* PKM badge */
.pkm{display:flex;align-items:center;gap:18px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 24px;margin-top:40px;max-width:640px;box-shadow:0 8px 24px rgba(26,32,44,.05)}
.pkm img{height:46px;width:46px;border-radius:10px}
.pkm .t{font-size:14px;color:var(--muted);text-align:left}
.pkm .t b{color:var(--text);display:block;font-size:15px}

/* ---------- Footer ---------- */
footer{padding:48px 0;border-top:1px solid var(--line);background:#fff}
.foot{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.foot .muted{color:var(--muted);font-size:14px}
.foot .links{display:flex;gap:24px;font-size:14px;color:var(--muted)}
.foot .links a:hover{color:var(--teal-dark)}
.foot .brand{color:var(--text)}

/* ---------- Verification page ---------- */
body.center{min-height:100vh;display:grid;place-items:center}
.verify{max-width:480px;width:100%;margin:0 auto;padding:24px}
.verify-card{background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:44px 40px;text-align:center;box-shadow:var(--shadow)}
.verify .ico{width:84px;height:84px;margin:0 auto 24px;border-radius:50%;display:grid;place-items:center;font-size:38px}
.verify .ico.ok{background:var(--success-light);color:var(--success)}
.verify .ico.err{background:var(--red-light);color:var(--red)}
.verify .ico.wait{background:var(--teal-light);color:var(--teal-dark)}
.verify h1{font-size:26px;font-weight:800;margin-bottom:12px;color:var(--text)}
.verify p{color:var(--muted);font-size:16px}
.verify .email{display:inline-block;margin:16px 0 4px;padding:4px 14px;border-radius:8px;background:var(--teal-light);border:1px solid rgba(6,215,215,.4);color:var(--teal-dark);font-weight:600;font-size:15px}
.verify .ok-btn{margin-top:24px;width:100%;justify-content:center;color:#052a2a}
.verify .spin{width:44px;height:44px;border:4px solid var(--line);border-top-color:var(--teal);border-radius:50%;animation:rot 1s linear infinite;margin:0 auto 20px}
@keyframes rot{to{transform:rotate(360deg)}}
.verify .back{margin-top:22px;font-size:14px;color:var(--muted)}
.verify .back a{color:var(--teal-dark)}

@media(max-width:880px){
  .metrics{grid-template-columns:repeat(2,1fr)}
  .features,.steps{grid-template-columns:1fr}
  .nav-links{display:none}
  .band{padding:40px 24px}
}