:root {
  --ink: #0f172a;
  --muted: #475569;
  --soft: #94a3b8;
  --surface: #ffffff;
  --bg: #ffffff;
  --bg-soft: #f6f9fc;
  --line: #e6edf3;
  --brand: #0d9488;
  --brand-grad: linear-gradient(120deg, #0d9488, #2563eb);
  --radius: 16px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 30px rgba(15, 23, 42, 0.08);
  --maxw: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.brand-mark {
  color: var(--brand);
}

.brand-accent {
  color: var(--brand);
}

.nav-links {
  display: flex;
  gap: 26px;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--ink);
}

/* hero */
.hero {
  position: relative;
  padding: 96px 0 80px;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(37, 99, 235, 0.10), transparent 60%),
    radial-gradient(900px 400px at 10% 0%, rgba(13, 148, 136, 0.12), transparent 55%),
    var(--bg);
  overflow: hidden;
}

.hero-inner {
  max-width: 720px;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand);
  background: rgba(13, 148, 136, 0.1);
  padding: 6px 12px;
  border-radius: 999px;
  margin: 0 0 20px;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 0 0 20px;
}

.grad {
  background: var(--brand-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  font-size: 1.2rem;
  color: var(--muted);
  max-width: 60ch;
  margin: 0 0 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.hero-note {
  margin: 0;
  color: var(--soft);
  font-size: 0.9rem;
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--brand-grad);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  box-shadow: 0 12px 34px rgba(13, 148, 136, 0.28);
}

.btn-ghost {
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  border-color: var(--brand);
  color: var(--brand);
}

/* sections */
.section {
  padding: 84px 0;
}

.section-soft {
  background: var(--bg-soft);
}

.section-head {
  max-width: 640px;
  margin: 0 0 44px;
}

.section-head h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.2rem);
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

.section-head p {
  color: var(--muted);
  margin: 0;
  font-size: 1.05rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(13, 148, 136, 0.4);
}

.card-num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 1.18rem;
  letter-spacing: -0.01em;
}

.card p {
  margin: 0;
  color: var(--muted);
}

/* disclaimer */
.disclaimer-box {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: var(--radius);
  padding: 34px 38px;
  box-shadow: var(--shadow-sm);
}

.disclaimer-box h2 {
  margin: 0 0 18px;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
}

.disclaimer-box p {
  color: var(--muted);
  margin: 0 0 14px;
  max-width: 80ch;
}

.disclaimer-box strong {
  color: var(--ink);
}

/* footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg);
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-brand {
  font-weight: 700;
}

.footer-tag,
.footer-copy {
  color: var(--soft);
  font-size: 0.9rem;
}

/* responsive */
@media (max-width: 820px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 72px 0 56px;
  }

  .section {
    padding: 60px 0;
  }
}

@media (max-width: 520px) {
  .nav-links {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}