:root {
  --bg: #ffffff;
  --bg-alt: #f4f7fa;
  --surface: #ffffff;
  --text: #16202b;
  --muted: #55636f;
  --border: #e2e8ee;
  --brand: #0f2a44;
  --accent: #0e7c86;
  --accent-soft: #e3f3f4;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 32, 48, 0.05), 0 6px 20px rgba(16, 32, 48, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1520;
    --bg-alt: #111c29;
    --surface: #152232;
    --text: #e8eef3;
    --muted: #a3b1bd;
    --border: #23344a;
    --brand: #e8eef3;
    --accent: #3cc4cf;
    --accent-soft: #143840;
    --shadow: none;
  }
}

:root[data-theme="dark"] {
  --bg: #0d1520;
  --bg-alt: #111c29;
  --surface: #152232;
  --text: #e8eef3;
  --muted: #a3b1bd;
  --border: #23344a;
  --brand: #e8eef3;
  --accent: #3cc4cf;
  --accent-soft: #143840;
  --shadow: none;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.2; color: var(--brand); margin: 0 0 0.5em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); letter-spacing: -0.02em; max-width: 18ch; }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.3rem); letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
a { color: var(--accent); }

.container { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--brand); font-size: 1.2rem; font-weight: 500; }
.logo strong { color: var(--accent); font-weight: 700; }
.logo-mark {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px;
  background: var(--accent); color: #fff; font-size: 0.85rem; font-weight: 700;
}
.nav { display: flex; gap: 28px; }
.nav a { color: var(--muted); text-decoration: none; font-weight: 500; font-size: 0.95rem; }
.nav a:hover { color: var(--text); }

/* Buttons */
.btn {
  display: inline-block; padding: 13px 24px; border-radius: 10px; font-weight: 600;
  text-decoration: none; font-size: 1rem; border: 1px solid transparent; transition: transform .15s, background .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-sm { padding: 9px 16px; font-size: 0.92rem; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 85%, #000); }
.btn-ghost { border-color: var(--border); color: var(--text); background: var(--surface); }
.btn-light { background: #fff; color: #0f2a44; }

/* Hero */
.hero { padding: 96px 0 80px; background: radial-gradient(1200px 400px at 80% -10%, var(--accent-soft), transparent 70%); }
.eyebrow { text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.8rem; font-weight: 600; color: var(--accent); margin-bottom: 12px; }
.lead { font-size: 1.2rem; color: var(--muted); max-width: 60ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 32px 0 40px; }
.hero-points { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 12px 28px; color: var(--muted); font-size: 0.95rem; }
.hero-points li::before { content: "✓"; color: var(--accent); font-weight: 700; margin-right: 8px; }

/* Sections */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 640px; margin-bottom: 48px; }
.section-head p:last-child { color: var(--muted); }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
}
.card p { color: var(--muted); margin: 0; font-size: 0.98rem; }
.card.plain { box-shadow: none; }
.icon {
  width: 44px; height: 44px; border-radius: 10px; background: var(--accent-soft);
  display: grid; place-items: center; margin-bottom: 18px;
}
.icon svg { width: 22px; height: 22px; fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.product { display: flex; flex-direction: column; gap: 12px; text-decoration: none; color: inherit; transition: border-color .15s, transform .15s; }
.product:hover { border-color: var(--accent); transform: translateY(-2px); }
.product-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.product h3 { margin: 0; font-size: 1.35rem; }
.tag { font-size: 0.78rem; font-weight: 600; color: var(--accent); background: var(--accent-soft); padding: 4px 10px; border-radius: 999px; white-space: nowrap; }
.link { margin-top: auto; font-weight: 600; color: var(--accent); font-size: 0.95rem; }

/* Flow diagram */
.flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 16px; align-items: stretch; }
.flow-col { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.flow-col h3 { font-size: 1.05rem; }
.flow-col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.flow-col li { color: var(--muted); font-size: 0.96rem; padding-left: 18px; position: relative; }
.flow-col li::before { content: ""; position: absolute; left: 0; top: 0.6em; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.flow-core { border: 2px solid var(--accent); box-shadow: var(--shadow); }
.flow-arrow { display: grid; place-items: center; color: var(--accent); font-size: 1.6rem; font-weight: 700; }

.mt { margin-top: 14px; }
.card.featured { border: 2px solid var(--accent); }
.trust { list-style: none; padding: 0; margin: 32px 0 0; display: flex; flex-wrap: wrap; gap: 12px 28px; color: var(--muted); font-size: 0.95rem; }
.trust li::before { content: "✓"; color: var(--accent); font-weight: 700; margin-right: 8px; }

/* Steps */
.steps { list-style: none; padding: 0; margin: 0 0 48px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.steps li { border-top: 3px solid var(--accent); padding-top: 20px; }
.steps p { color: var(--muted); font-size: 0.98rem; margin: 0; }
.step-num { display: block; font-weight: 700; color: var(--accent); font-size: 0.9rem; margin-bottom: 6px; }
.model { padding: 24px; border-radius: var(--radius); background: var(--bg-alt); }
.model p { color: var(--muted); margin: 0; font-size: 0.98rem; }

/* About */
.about { display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px; align-items: start; }
.about p { color: var(--muted); }
.about-list { list-style: none; padding: 0; margin: 40px 0 0; display: grid; gap: 12px; }
.about-list li { padding: 16px 20px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); color: var(--muted); font-size: 0.97rem; }
.about-list strong { color: var(--text); }

/* CTA */
.cta { background: #0f2a44; color: #fff; text-align: center; }
.cta h2 { color: #fff; }
.cta p { color: #c4d3df; font-size: 1.1rem; }
.cta-inner { max-width: 720px; }
.cta .btn { margin-top: 12px; word-break: break-all; }

/* Contact form */
.contact { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: start; text-align: left; }
.contact-points { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 10px; color: #c4d3df; }
.contact-points li::before { content: "✓"; color: #5fd3dc; font-weight: 700; margin-right: 8px; }
.contact-form { background: #fff; color: #16202b; border-radius: var(--radius); padding: 28px; display: grid; gap: 16px; }
.contact-form label { display: grid; gap: 6px; font-weight: 600; font-size: 0.92rem; color: #16202b; }
.contact-form .optional { font-weight: 400; color: #6b7883; }
.contact-form input, .contact-form textarea {
  font: inherit; font-weight: 400; font-size: 1rem; color: #16202b; background: #fff;
  border: 1px solid #cfd8e0; border-radius: 10px; padding: 11px 13px; width: 100%;
}
.contact-form textarea { resize: vertical; min-height: 120px; }
.contact-form input:focus, .contact-form textarea:focus { outline: 2px solid #0e7c86; outline-offset: 1px; border-color: #0e7c86; }
.contact-form button { justify-self: start; border: 0; cursor: pointer; font-family: inherit; }
.contact-form button:disabled { opacity: 0.6; cursor: wait; }
.contact-form .btn-primary { background: #0e7c86; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.form-status { margin: 0; font-size: 0.95rem; color: #55636f; min-height: 1.4em; }
.form-status.success { color: #0a7a3d; }
.form-status.error { color: #b42318; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 28px 0; color: var(--muted); font-size: 0.88rem; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }

/* Responsive */
@media (max-width: 900px) {
  .grid-3, .steps { grid-template-columns: repeat(2, 1fr); }
  .about { grid-template-columns: 1fr; gap: 0; }
  .flow { grid-template-columns: 1fr; }
  .contact { grid-template-columns: 1fr; gap: 32px; }
  .flow-arrow { transform: rotate(90deg); }
}
@media (max-width: 720px) {
  .nav { display: none; }
  .grid-2, .grid-3, .steps { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 64px 0; }
  .container { padding: 0 16px; }
  body { font-size: 16px; }
  .field-row { grid-template-columns: 1fr; }
  .contact-form { padding: 20px; }
}