/* Synapse — synapsehealth.app
   Shared styles. Dark-first, matching the app's EKG/green identity. */

:root {
  --bg: #0a0f1a;
  --bg-2: #0f1726;
  --surface: #121b2b;
  --surface-2: #16203200;
  --line: #1f2c40;
  --ink: #e9eef6;
  --mut: #9aa7bd;
  --faint: #6b7890;
  --accent: #34d399;
  --accent-2: #10b981;
  --accent-3: #6ee7b7;
  --radius: 16px;
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(1100px 540px at 50% -10%, #11203a 0%, rgba(17,32,58,0) 60%),
    var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-3); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* Header */
header.site {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(140%) blur(10px);
  background: rgba(10,15,26,0.72);
  border-bottom: 1px solid var(--line);
}
header.site .bar {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; letter-spacing: -0.01em; }
.brand svg { display: block; }
.brand .sub { color: var(--faint); font-weight: 600; font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; }
nav.top a { color: var(--mut); font-weight: 600; font-size: 15px; margin-left: 22px; }
nav.top a:hover { color: var(--ink); }
@media (max-width: 620px) { nav.top a { margin-left: 16px; font-size: 14px; } nav.top a.hide-sm { display: none; } }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 22px; border-radius: 999px; font-weight: 700; font-size: 16px;
  border: 1px solid transparent; cursor: pointer; transition: transform .06s ease, filter .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  color: #04231a;
  background: linear-gradient(180deg, var(--accent-3), var(--accent));
}
.btn-primary:hover { color: #04231a; filter: brightness(1.05); }
.btn-ghost { color: var(--ink); border-color: var(--line); background: transparent; }
.btn-ghost:hover { color: var(--ink); border-color: #2c3c56; }

/* Hero */
.hero { padding: 72px 0 40px; text-align: center; }
.hero .tile { margin: 0 auto 26px; width: 104px; height: 104px; }
.hero h1 { font-size: clamp(34px, 6vw, 60px); line-height: 1.05; letter-spacing: -0.03em; margin: 0 0 16px; }
.hero h1 .grad {
  background: linear-gradient(90deg, var(--accent-2), var(--accent-3));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { font-size: clamp(17px, 2.4vw, 21px); color: var(--mut); max-width: 640px; margin: 0 auto 30px; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .note { margin-top: 16px; color: var(--faint); font-size: 14px; }

/* Sections */
section { padding: 48px 0; }
.eyebrow { color: var(--accent); font-weight: 700; font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; text-align: center; }
h2.section-title { text-align: center; font-size: clamp(26px, 4vw, 38px); letter-spacing: -0.02em; margin: 8px 0 40px; }

/* Feature grid */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 860px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }
.card {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 22px;
}
.card .ic { font-size: 24px; margin-bottom: 10px; }
.card h3 { margin: 0 0 6px; font-size: 18px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--mut); font-size: 15px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 720px) { .steps { grid-template-columns: 1fr; } }
.step .n { width: 34px; height: 34px; border-radius: 999px; display: grid; place-items: center;
  font-weight: 800; color: #04231a; background: linear-gradient(180deg, var(--accent-3), var(--accent)); margin-bottom: 10px; }
.step h3 { margin: 0 0 6px; font-size: 18px; }
.step p { margin: 0; color: var(--mut); }

/* CTA band */
.band {
  margin: 16px 0 0; text-align: center;
  background: linear-gradient(180deg, #102236, #0c1626);
  border: 1px solid var(--line); border-radius: 24px; padding: 44px 24px;
}
.band h2 { font-size: clamp(24px, 4vw, 34px); letter-spacing: -0.02em; margin: 0 0 10px; }
.band p { color: var(--mut); margin: 0 0 24px; }

/* Footer */
footer.site { border-top: 1px solid var(--line); margin-top: 56px; padding: 36px 0 56px; color: var(--mut); }
footer.site .row { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
footer.site nav a { color: var(--mut); font-weight: 600; margin-left: 20px; }
footer.site nav a:first-child { margin-left: 0; }
footer.site nav a:hover { color: var(--ink); }
footer.site .copy { color: var(--faint); font-size: 14px; }

/* Legal pages (privacy / terms) */
.legal { max-width: 760px; }
.legal h1 { font-size: 32px; letter-spacing: -0.02em; margin: 8px 0 4px; }
.legal .eff { color: var(--faint); font-size: 14px; margin: 0 0 28px; }
.legal h2 { font-size: 20px; letter-spacing: -0.01em; margin: 30px 0 8px; }
.legal p, .legal li { color: #cfd8e6; font-size: 16px; }
.legal ul { padding-left: 22px; }
.legal hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
.legal code { background: #0e1726; border: 1px solid var(--line); padding: 1px 6px; border-radius: 6px; font-size: 90%; }
.legal .tmpl { background: #0e1726; border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; color: var(--faint); font-size: 14px; }