/* Alpha Bio Charm — plain CSS, system fonts, no third-party resources. */

:root {
  --bg: #f6faf8;
  --bg-alt: #ffffff;
  --bg-tint: #e6f4ee;
  --fg: #12231e;
  --muted: #4b6860;
  --accent: #0f8f6b;
  --accent-strong: #0a6b50;
  --accent-2: #7a5cd6;
  --border: #d3e4dc;
  --shadow: 0 1px 2px rgba(18, 35, 30, .06), 0 8px 24px rgba(18, 35, 30, .06);
  --max: 1040px;
  --radius: 14px;
  --serif: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1613;
    --bg-alt: #112420;
    --bg-tint: #0f2a23;
    --fg: #eaf4f0;
    --muted: #9db9b0;
    --accent: #5fd9b4;
    --accent-strong: #8ae8cb;
    --accent-2: #a995f0;
    --border: #21403a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--serif); line-height: 1.2; font-weight: 700; }
a { color: var(--accent-strong); }
a:hover { color: var(--accent); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.5rem; }

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #fff; padding: .5rem 1rem; z-index: 10;
}
.skip:focus { left: 0; }

/* ---------- Header / nav (CSS-only mobile menu) ---------- */
header.site {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 1rem; flex-wrap: wrap;
}
.logo {
  display: inline-flex; align-items: center; gap: .6rem;
  font-family: var(--serif); font-size: 1.25rem; font-weight: 700;
  color: var(--fg); text-decoration: none;
}
.logo svg { width: 34px; height: 34px; }
.logo span { color: var(--accent); }

.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-button {
  display: none; cursor: pointer; padding: .5rem .8rem;
  border: 1px solid var(--border); border-radius: 8px; font-size: .9rem; color: var(--muted);
}
.nav-toggle:focus-visible + .nav-button { outline: 3px solid var(--accent); }
nav ul { list-style: none; display: flex; gap: .25rem; margin: 0; padding: 0; }
nav a {
  display: block; padding: .45rem .85rem; border-radius: 999px;
  color: var(--muted); text-decoration: none; font-size: .95rem;
}
nav a:hover { color: var(--fg); background: var(--bg-tint); }
nav a[aria-current="page"] { color: var(--accent-strong); background: var(--bg-tint); font-weight: 600; }

@media (max-width: 680px) {
  .nav-button { display: inline-block; }
  nav { width: 100%; display: none; padding-bottom: .75rem; }
  .nav-toggle:checked ~ nav { display: block; }
  nav ul { flex-direction: column; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(60rem 30rem at 85% -10%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 60%),
    radial-gradient(40rem 24rem at -10% 110%, color-mix(in srgb, var(--accent-2) 16%, transparent), transparent 60%),
    var(--bg);
}
.hero .wrap {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 2rem; align-items: center;
  padding-top: 4.5rem; padding-bottom: 4.5rem;
}
.eyebrow {
  display: inline-block; font-size: .8rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent-strong); background: var(--bg-tint);
  padding: .3rem .8rem; border-radius: 999px; margin-bottom: 1.2rem; font-weight: 600;
}
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); margin: 0 0 1.2rem; letter-spacing: -.01em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.lead { font-size: 1.2rem; color: var(--muted); max-width: 36rem; margin: 0 0 2rem; }
.hero-art svg { width: 100%; height: auto; max-width: 420px; margin: 0 auto; display: block; }

.page-hero { background: var(--bg-tint); border-bottom: 1px solid var(--border); }
.page-hero .wrap { padding-top: 3.5rem; padding-bottom: 3rem; }
.page-hero h1 { font-size: clamp(1.9rem, 4vw, 2.8rem); margin: 0 0 .75rem; }
.page-hero .lead { margin-bottom: 0; }

@media (max-width: 820px) {
  .hero .wrap { grid-template-columns: 1fr; padding-top: 3rem; padding-bottom: 3rem; }
  .hero-art { order: -1; max-width: 260px; margin: 0 auto; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; padding: .8rem 1.5rem; border-radius: 999px;
  background: var(--accent); color: #fff; text-decoration: none; font-weight: 600;
  border: 2px solid var(--accent); transition: transform .15s, background .15s;
}
.btn:hover { background: var(--accent-strong); border-color: var(--accent-strong); color: #fff; transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--accent-strong); margin-left: .5rem; }
.btn.ghost:hover { background: var(--bg-tint); color: var(--accent-strong); }
@media (prefers-color-scheme: dark) { .btn, .btn:hover { color: #06221a; } }

/* ---------- Sections ---------- */
section { padding: 4.5rem 0; }
section.alt { background: var(--bg-alt); border-block: 1px solid var(--border); }
section h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0 0 .75rem; }
.section-intro { color: var(--muted); max-width: 42rem; margin: 0 0 2.5rem; font-size: 1.08rem; }

.grid { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card {
  background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.75rem; box-shadow: var(--shadow);
}
section.alt .card { background: var(--bg); }
.card h3 { margin: 1rem 0 .5rem; font-size: 1.25rem; }
.card p { margin: 0; color: var(--muted); }
.icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: var(--bg-tint); color: var(--accent-strong);
}
.icon svg { width: 28px; height: 28px; }

/* Stats */
.stats { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); margin: 0; padding: 0; list-style: none; }
.stats li { text-align: center; padding: 1.5rem 1rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-alt); }
.stats strong { display: block; font-family: var(--serif); font-size: 2.4rem; color: var(--accent); line-height: 1.1; }
.stats span { color: var(--muted); font-size: .95rem; }

/* Two-column prose */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
@media (max-width: 820px) { .split { grid-template-columns: 1fr; gap: 2rem; } }
.split p { color: var(--muted); }
.split h2 { margin-top: 0; }

.checks { list-style: none; padding: 0; margin: 1.25rem 0 0; display: grid; gap: .75rem; }
.checks li { position: relative; padding-left: 2rem; }
.checks li::before {
  content: "\2713"; position: absolute; left: 0; top: .1em; width: 1.3rem; height: 1.3rem;
  border-radius: 50%; background: var(--bg-tint); color: var(--accent-strong);
  font-size: .8rem; font-weight: 700; display: grid; place-items: center;
}

/* Timeline (pipeline) */
.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; display: grid; gap: 1.25rem; }
.steps li {
  counter-increment: step; position: relative;
  background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.5rem 5rem; box-shadow: var(--shadow);
}
.steps li::before {
  content: counter(step); position: absolute; left: 1.5rem; top: 1.4rem;
  width: 2.4rem; height: 2.4rem; border-radius: 50%;
  background: var(--accent); color: #fff; font-family: var(--serif); font-weight: 700;
  display: grid; place-items: center;
}
@media (prefers-color-scheme: dark) { .steps li::before { color: #06221a; } }
.steps h3 { margin: 0 0 .35rem; font-size: 1.15rem; }
.steps p { margin: 0; color: var(--muted); }

/* Call to action band */
.cta {
  background: linear-gradient(135deg, var(--accent-strong), var(--accent-2));
  color: #fff; border-radius: calc(var(--radius) * 1.5); padding: 3rem 2rem; text-align: center;
}
.cta h2 { color: #fff; }
.cta p { color: rgba(255,255,255,.9); max-width: 36rem; margin: 0 auto 1.5rem; }
.cta .btn { background: #fff; color: #0a3d2e; border-color: #fff; }
.cta .btn:hover { background: #e6f4ee; color: #0a3d2e; }

/* Contact */
.contact-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 1rem; }
.contact-list li { padding: 1.25rem 1.5rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-alt); }
.contact-list strong { display: block; font-family: var(--serif); margin-bottom: .2rem; }

.notice { border-left: 4px solid var(--accent); background: var(--bg-tint); padding: 1rem 1.25rem; border-radius: 0 10px 10px 0; color: var(--muted); }

/* ---------- Footer ---------- */
footer.site { border-top: 1px solid var(--border); background: var(--bg-alt); padding: 2.5rem 0; color: var(--muted); font-size: .92rem; }
footer.site .wrap { display: flex; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap; }
footer.site ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 1.25rem; flex-wrap: wrap; }
footer.site a { color: var(--muted); }
footer.site a:hover { color: var(--accent); }

@media print {
  header.site, .cta, .nav-button { display: none; }
  body { background: #fff; color: #000; }
}