:root {
  --bg: #ffffff;
  --bg-alt: #f4f7fa;
  --surface: #ffffff;
  --text: #16202a;
  --muted: #56636f;
  --rule: #dde4ea;
  --brand: #0f3d5e;
  --accent: #1a7f8e;
  --accent-ink: #ffffff;
  --shadow: 0 1px 2px rgb(16 32 48 / 6%), 0 4px 16px rgb(16 32 48 / 6%);
  --radius: 12px;
  --wrap: 68rem;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1419;
    --bg-alt: #121c23;
    --surface: #16222b;
    --text: #e4eaef;
    --muted: #97a6b3;
    --rule: #26343f;
    --brand: #7cc4e8;
    --accent: #3fb4c4;
    --accent-ink: #06181c;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 4px 16px rgb(0 0 0 / 25%);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--accent); }
img, svg { display: block; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 0.75rem; }
h2 { font-size: clamp(1.6rem, 4vw, 2.1rem); color: var(--brand); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1rem; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 2rem; } }

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: var(--accent-ink); padding: 0.5rem 1rem; z-index: 10;
}
.skip:focus { left: 0; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4rem; }
.brand { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; color: var(--brand); font-size: 1.25rem; letter-spacing: 0.01em; }
.brand strong { color: var(--accent); }
nav ul { display: flex; align-items: center; gap: 1.25rem; list-style: none; margin: 0; padding: 0; }
nav a { color: var(--text); text-decoration: none; font-weight: 500; font-size: 0.95rem; }
nav a:hover { color: var(--accent); }
@media (max-width: 640px) {
  nav li:not(:last-child) { display: none; }
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--accent); color: var(--accent-ink);
  padding: 0.75rem 1.4rem; border-radius: 999px;
  font-weight: 600; text-decoration: none;
  border: 2px solid var(--accent);
  transition: filter 0.15s;
}
.btn:hover { filter: brightness(1.1); }
nav a.btn { color: var(--accent-ink); }
.btn-small { padding: 0.4rem 1rem; }
.btn-ghost { background: transparent; color: var(--accent); }
.btn-ghost:hover { background: var(--accent); color: var(--accent-ink); filter: none; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

/* Hero */
.hero {
  padding: clamp(3.5rem, 10vw, 7rem) 0 clamp(3rem, 8vw, 5.5rem);
  background:
    radial-gradient(60rem 30rem at 100% 0%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 70%),
    var(--bg);
}
.hero h1 { font-size: clamp(2.1rem, 6vw, 3.5rem); max-width: 18ch; color: var(--brand); letter-spacing: -0.015em; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.14em; font-size: 0.8rem; font-weight: 700; color: var(--accent); margin-bottom: 0.75rem; }
.lede { font-size: clamp(1.05rem, 2.2vw, 1.25rem); color: var(--muted); max-width: 40rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }

/* Sections */
.section { padding: clamp(3rem, 8vw, 5.5rem) 0; }
.section + .section { border-top: 1px solid var(--rule); }

.grid { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); margin-top: 1.5rem; }
.card {
  background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius);
  padding: 1.5rem; box-shadow: var(--shadow);
}
.card p { color: var(--muted); margin: 0; }
.icon {
  width: 2.5rem; height: 2.5rem; padding: 0.5rem; margin-bottom: 1rem;
  border-radius: 10px; background: color-mix(in srgb, var(--accent) 14%, transparent);
  fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}

/* CallFlow feature */
.feature { background: var(--bg-alt); }
.feature-inner { display: grid; gap: 2.5rem; align-items: center; }
@media (min-width: 860px) { .feature-inner { grid-template-columns: 1.1fr 1fr; } }
.checks { list-style: none; padding: 0; margin: 0 0 1.75rem; }
.checks li { position: relative; padding-left: 1.75rem; margin-bottom: 0.5rem; }
.checks li::before {
  content: ""; position: absolute; left: 0.2rem; top: 0.45em;
  width: 0.5rem; height: 0.9rem; border: solid var(--accent); border-width: 0 3px 3px 0; transform: rotate(45deg);
}
.mock {
  margin: 0; background: var(--surface); border: 1px solid var(--rule);
  border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
}
.mock-head { display: flex; gap: 6px; padding: 0.75rem 1rem; border-bottom: 1px solid var(--rule); background: var(--bg-alt); }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--rule); }
.mock-body { padding: 1.25rem 1.5rem 1.5rem; }
.mock-subject { font-weight: 700; margin-bottom: 0.15rem; }
.mock-meta { color: var(--muted); font-size: 0.85rem; }
.mock-text { border-left: 3px solid var(--accent); padding-left: 1rem; font-style: italic; }
.mock-link { color: var(--accent); font-weight: 600; margin: 0; font-size: 0.95rem; }

/* About */
.about-cols { display: grid; gap: 2rem; }
@media (min-width: 860px) { .about-cols { grid-template-columns: 1.6fr 1fr; } }
.about-cols p { color: var(--muted); }
.facts { margin: 0; display: grid; gap: 1rem; }
.facts div { border-left: 3px solid var(--accent); padding-left: 1rem; }
.facts dt { font-size: 1.75rem; font-weight: 800; color: var(--brand); line-height: 1.1; }
.facts dd { margin: 0; color: var(--muted); }

/* Contact */
.contact { background: var(--bg-alt); }
.contact-row { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); margin-top: 1.5rem; }
.contact-item {
  display: flex; flex-direction: column; gap: 0.2rem;
  background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius);
  padding: 1.25rem 1.5rem; color: var(--text); text-decoration: none; overflow-wrap: anywhere;
}
a.contact-item:hover { border-color: var(--accent); }
.contact-item .label { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.75rem; font-weight: 700; color: var(--accent); }

/* Footer */
.site-footer { border-top: 1px solid var(--rule); padding: 2rem 0; color: var(--muted); font-size: 0.9rem; }
.site-footer p { margin: 0; }

/* 404 */
.notfound { min-height: 60vh; display: grid; place-items: center; text-align: center; }
.notfound .lede { margin: 0 auto 1.75rem; }