@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&display=swap");

:root {
  --bg: #000000;
  --fg: #ffffff;
  --muted: #a3a3a3;
  --border: #262626;
  --primary: #39ff33;
  --card: #0d0d0d;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
}

.bar {
  width: min(1280px, 100% - 2rem);
  height: 56px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-weight: 700;
  font-size: 1.55rem;
  line-height: 1;
  letter-spacing: -0.02em;
}

.brand a:hover {
  text-decoration: none;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.top-nav a {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: 6px;
  padding: 0.4rem 0.5rem;
}

.top-nav a:hover {
  color: var(--primary);
  text-decoration: none;
}

.wrap {
  width: min(760px, 100% - 2rem);
  margin: 0 auto;
  padding: 4rem 0 4rem;
}

h1 {
  margin: 0;
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: clamp(1.9rem, 4vw, 2.25rem);
  line-height: 1.1;
  color: var(--primary);
  letter-spacing: -0.03em;
}

h2 {
  margin: 0 0 0.65rem;
  color: var(--fg);
  font-size: 1.15rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

p {
  margin: 0.6rem 0 0;
}

ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

li + li {
  margin-top: 0.3rem;
}

strong {
  color: var(--fg);
}

.effective {
  margin-top: 0.6rem;
  color: var(--muted);
  font-size: 0.92rem;
}

section {
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.95rem;
}

section h2,
.sms-card h2 {
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: 1.22rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.75rem;
}

section p,
section li,
.footer-links {
  font-size: 1rem;
  line-height: 1.55;
}

.sms-card {
  margin-top: 2.1rem;
  padding: 1.2rem 1.1rem;
  border: 1px solid rgba(57, 255, 51, 0.3);
  border-radius: 0.95rem;
  background: var(--card);
}

.sms-card h2 {
  color: var(--primary);
}

.footer-links {
  margin-top: 2.2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

@media (max-width: 900px) {
  .brand {
    font-size: 1.5rem;
  }

  h1 {
    font-size: clamp(1.8rem, 7vw, 2.25rem);
  }

  section h2,
  .sms-card h2 {
    font-size: 1.15rem;
  }
}

@media (max-width: 640px) {
  .bar {
    width: min(1280px, 100% - 1rem);
    height: 50px;
  }

  .brand {
    font-size: 1.35rem;
  }

  .top-nav {
    gap: 0.15rem;
  }

  .top-nav a {
    font-size: 0.74rem;
    padding: 0.3rem 0.34rem;
  }

  .wrap {
    width: min(760px, 100% - 1.5rem);
    padding: 2rem 0 3rem;
  }

  section h2,
  .sms-card h2 {
    font-size: 1.1rem;
  }
}