:root {
  --bg0: #071a14;
  --bg1: #0b2e24;
  --ink: #f2f7f4;
  --muted: #9bb5aa;
  --accent: #3dcf9a;
  --accent-dim: rgba(61, 207, 154, 0.14);
  --line: rgba(242, 247, 244, 0.1);
  --font: "Pretendard Variable", Pretendard, "Apple SD Gothic Neo", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 700px at 12% -10%, #134a38 0%, transparent 55%),
    radial-gradient(900px 600px at 100% 10%, #1a3d55 0%, transparent 50%),
    linear-gradient(165deg, var(--bg0), var(--bg1) 55%, #08151f);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.glow {
  position: fixed;
  inset: auto -10% -20% auto;
  width: min(70vw, 520px);
  height: min(70vw, 520px);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61, 207, 154, 0.18), transparent 70%);
  pointer-events: none;
  filter: blur(8px);
}

.sheet {
  width: min(640px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(48px, 12vh, 96px) 0 64px;
  animation: rise 0.7s ease both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.brand {
  margin: 0 0 28px;
  font-size: clamp(2rem, 6vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.brand a {
  color: inherit;
  text-decoration: none;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(1.55rem, 4.5vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.lead {
  margin: 0 0 28px;
  max-width: 34em;
  color: var(--muted);
  font-size: 1.05rem;
}

.lead.muted {
  font-size: 0.95rem;
}

.points {
  margin: 0 0 40px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.points li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  font-size: 0.98rem;
}

.contact {
  padding: 22px 20px;
  border-radius: 18px;
  background: var(--accent-dim);
  border: 1px solid rgba(61, 207, 154, 0.28);
  margin-bottom: 28px;
  animation: rise 0.85s ease 0.08s both;
}

.contact h2 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
}

.contact p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.95rem;
}

.mail {
  display: inline-block;
  color: var(--accent);
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  letter-spacing: -0.02em;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.mail:hover {
  border-bottom-color: var(--accent);
}

.links {
  display: flex;
  gap: 18px;
  margin-bottom: 36px;
}

.links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.links a:hover {
  color: var(--ink);
  border-bottom-color: var(--line);
}

footer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  color: rgba(155, 181, 170, 0.75);
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.doc h1 {
  font-size: clamp(1.4rem, 4vw, 1.85rem);
}

.prose {
  margin: 0 0 36px;
  color: rgba(242, 247, 244, 0.88);
}

.prose h2 {
  margin: 28px 0 10px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
}

.prose p,
.prose li {
  color: var(--muted);
  font-size: 0.98rem;
}

.prose ul {
  margin: 0;
  padding-left: 1.2em;
}

.prose a {
  color: var(--accent);
  text-decoration: none;
}

.prose a:hover {
  text-decoration: underline;
}

@media (max-width: 480px) {
  .sheet {
    width: calc(100% - 32px);
  }

  footer {
    flex-direction: column;
  }
}