:root{
  --blue:#0a84ff; --blue-600:#0060df; --ink:#0b1220; --slate:#5b6472;
  --bg:#ffffff; --bg-soft:#f5f7fa; --line:#e6eaf0; --radius:18px;
  --shadow:0 10px 40px rgba(16,26,48,.10);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em;margin:0 0 .5em}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:.6rem 1rem;border-radius:0 0 8px 0;z-index:100}
.skip-link:focus{left:0}

/* header */
.site-header{position:sticky;top:0;z-index:50;display:flex;align-items:center;
  justify-content:space-between;gap:1rem;padding:.85rem clamp(1rem,4vw,2.5rem);
  background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(16px);
  border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:.55rem;font-weight:700;color:var(--ink);letter-spacing:-.02em;font-size:1.12rem}
.brand:hover{text-decoration:none}
.brand-mark{width:22px;height:22px;border-radius:7px;
  background:linear-gradient(135deg,var(--blue),#5ac8fa);
  box-shadow:inset 0 0 0 3px rgba(255,255,255,.55)}
.site-nav{display:flex;align-items:center;gap:.35rem}
.nav-link{padding:.5rem .8rem;border-radius:10px;color:var(--slate);font-weight:500}
.nav-link:hover{color:var(--ink);background:var(--bg-soft);text-decoration:none}
.nav-link.is-active{color:var(--ink)}
.nav-cta{color:#fff;background:var(--blue)}
.nav-cta:hover{background:var(--blue-600);color:#fff}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:.4rem}
.nav-toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.2s}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.8rem 1.4rem;border-radius:999px;font-weight:600;cursor:pointer;border:1px solid transparent;transition:.15s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-600);color:#fff}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{background:var(--bg-soft)}
.btn-sm{padding:.5rem 1rem;font-size:.9rem}

/* hero */
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:2rem;align-items:center;
  max-width:1120px;margin:0 auto;padding:clamp(2.5rem,7vw,5.5rem) clamp(1rem,4vw,2.5rem)}
.hero-title{font-size:clamp(2.2rem,5.5vw,3.6rem);font-weight:800}
.hero-sub{font-size:1.15rem;color:var(--slate);max-width:34ch}
.hero-cta{display:flex;gap:.8rem;flex-wrap:wrap;margin:1.6rem 0 1rem}
.hero-note{font-size:.9rem;color:var(--slate)}
.hero-art{display:flex;justify-content:center}
.phone{width:230px;height:470px;border-radius:40px;background:#0b1220;padding:12px;
  box-shadow:var(--shadow);position:relative}
.phone-screen{position:relative;width:100%;height:100%;border-radius:30px;overflow:hidden;
  background:linear-gradient(160deg,#eaf1f7,#dfeaf3)}
.map-grid{position:absolute;inset:0;background-image:
  linear-gradient(rgba(10,132,255,.08) 1px,transparent 1px),
  linear-gradient(90deg,rgba(10,132,255,.08) 1px,transparent 1px);
  background-size:26px 26px}
.trail{position:absolute;inset:0;width:100%;height:100%}
.metrics{position:absolute;left:10px;right:10px;bottom:12px;display:grid;grid-template-columns:1fr 1fr 1fr 1fr;
  gap:2px;background:rgba(255,255,255,.82);backdrop-filter:blur(8px);border-radius:16px;padding:10px 6px}
.metrics div{display:flex;flex-direction:column;align-items:center}
.metrics b{font-size:1rem;font-variant-numeric:tabular-nums}
.metrics span{font-size:.6rem;color:var(--slate);text-transform:uppercase;letter-spacing:.04em}

/* features */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;
  max-width:1120px;margin:0 auto;padding:1rem clamp(1rem,4vw,2.5rem) 3rem}
.feature{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem}
.feature-ic{font-size:1.7rem;margin-bottom:.4rem}
.feature h3{font-size:1.05rem;margin-bottom:.25rem}
.feature p{margin:0;color:var(--slate);font-size:.95rem}

/* bands */
.privacy-band,.get{max-width:820px;margin:0 auto;padding:3.5rem clamp(1rem,4vw,2.5rem);text-align:center}
.privacy-band h2,.get h2{font-size:clamp(1.6rem,3.5vw,2.2rem)}
.privacy-band p,.get p{color:var(--slate);font-size:1.08rem}
.get{border-top:1px solid var(--line)}

/* legal */
.legal{max-width:760px;margin:0 auto;padding:clamp(2rem,5vw,3.5rem) clamp(1rem,4vw,2rem)}
.legal h1{font-size:clamp(1.8rem,4vw,2.4rem)}
.legal h2{font-size:1.15rem;margin-top:2rem}
.legal p,.legal li{color:#2a333f}
.legal-updated{color:var(--slate);font-size:.9rem}
.legal-entity{margin-top:2rem;color:var(--slate);font-size:.9rem}

/* runs viewer */
.runs{max-width:1120px;margin:0 auto;padding:clamp(1.5rem,4vw,3rem) clamp(1rem,4vw,2.5rem)}
.runs-head h1{font-size:clamp(1.8rem,4vw,2.4rem)}
.runs-lede{color:var(--slate);max-width:60ch}
.runs-auth,.runs-notice{background:var(--bg-soft);border:1px solid var(--line);
  border-radius:var(--radius);padding:1.5rem;text-align:center;margin-top:1.2rem}
.runs-notice{color:var(--slate)}
.runs-dashboard{display:grid;grid-template-columns:1.4fr .9fr;gap:1.2rem;margin-top:1.2rem;min-height:520px}
.runs-map{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);min-height:520px;background:var(--bg-soft)}
.runs-list{display:flex;flex-direction:column;gap:.6rem}
.runs-summary{font-weight:600}
#activities{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.5rem;overflow:auto;max-height:460px}
#activities li{display:flex;justify-content:space-between;gap:.6rem;padding:.7rem .9rem;
  border:1px solid var(--line);border-radius:12px;cursor:pointer;background:#fff}
#activities li:hover,#activities li.sel{border-color:var(--blue);background:#f3f8ff}
#activities .a-title{font-weight:600}
#activities .a-sub{color:var(--slate);font-size:.85rem}
#activities .a-dist{font-variant-numeric:tabular-nums;font-weight:600}

/* footer */
.site-footer{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:.5rem;
  padding:2rem 1rem;color:var(--slate);font-size:.9rem;border-top:1px solid var(--line);margin-top:2rem}
.site-footer a{color:var(--slate)}
.site-footer a:hover{color:var(--ink)}
.sep{opacity:.5}

@media (max-width:820px){
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;right:0;left:0;flex-direction:column;align-items:stretch;
    gap:.15rem;padding:.6rem;background:#fff;border-bottom:1px solid var(--line);display:none}
  .site-nav.open{display:flex}
  .nav-cta{text-align:center}
  .hero{grid-template-columns:1fr;text-align:center}
  .hero-cta{justify-content:center}
  .hero-sub{margin-inline:auto}
  .hero-art{order:-1}
  .features{grid-template-columns:1fr 1fr}
  .runs-dashboard{grid-template-columns:1fr}
  .runs-map{min-height:340px}
}
@media (max-width:520px){ .features{grid-template-columns:1fr} }

@media (prefers-color-scheme:dark){
  :root{--ink:#eef2f8;--slate:#9aa5b5;--bg:#0b1220;--bg-soft:#141d2e;--line:#243149;
    --shadow:0 10px 40px rgba(0,0,0,.5)}
  body{background:var(--bg)}
  .site-header{background:rgba(11,18,32,.8);}
  .btn-ghost{background:#141d2e}
  #activities li{background:#141d2e}
  #activities li:hover,#activities li.sel{background:#16233b}
  .legal p,.legal li{color:#c4cdda}
}