:root {
  --ink: #12151c;
  --muted: #5c6573;
  --line: #e4e7ee;
  --blue: #1a4fd8;
  --blue-soft: #f3f6fd;
  --white: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Pretendard, "Segoe UI", sans-serif;
  line-height: 1.65;
}

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

header {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 24px;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
}

.logo {
  font-weight: 800;
  letter-spacing: -0.04em;
  font-size: 1.15rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 0.95rem;
  font-weight: 600;
}

nav a:hover { color: var(--blue); }

.hero,
section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 72px 24px;
}

.hero {
  padding-top: 88px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--line);
}

.eyebrow,
.section-label {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

h1 {
  margin: 0;
  max-width: 12em;
  font-size: clamp(2.3rem, 5vw, 3.6rem);
  line-height: 1.18;
  letter-spacing: -0.045em;
  font-weight: 800;
}

h2 {
  margin: 0 0 28px;
  font-size: clamp(1.55rem, 3vw, 2rem);
  letter-spacing: -0.035em;
  line-height: 1.3;
}

.lead {
  max-width: 38rem;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.section-lead { margin-top: -12px; margin-bottom: 28px; }

.actions {
  display: flex;
  gap: 10px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 11px 16px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
}

.btn-primary {
  background: var(--ink);
  color: var(--white);
}

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

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

section { border-bottom: 1px solid var(--line); }

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: start;
}

.about-grid > p {
  margin: 0;
  font-size: 1.08rem;
}

.facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.facts strong {
  display: block;
  margin-bottom: 2px;
}

.facts span { color: var(--muted); }

.grid,
.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

article {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px;
  background: var(--white);
}

.code {
  margin: 0;
  color: var(--blue);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

article h3 {
  margin: 8px 0 8px;
  font-size: 1.15rem;
  letter-spacing: -0.03em;
}

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

.ideas {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.ideas li {
  padding: 22px 22px 22px 0;
  border-bottom: 1px solid var(--line);
}

.ideas li:nth-child(odd) { padding-right: 36px; }

.ideas li:nth-child(even) {
  padding-left: 36px;
  border-left: 1px solid var(--line);
}

.ideas h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

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

.plan-main {
  background: var(--blue-soft);
  border-color: #c9d6f5;
}

.badge {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 700;
}

.price {
  margin: 8px 0 16px;
  color: var(--ink);
  font-weight: 700;
}

.price span {
  font-size: 2rem;
  letter-spacing: -0.04em;
  font-weight: 800;
}

.price .per {
  margin-left: 2px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.plans ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.plans li + li { margin-top: 6px; }

footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 24px 48px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 800px) {
  .about-grid,
  .grid,
  .plans,
  .ideas { grid-template-columns: 1fr; }

  .ideas li,
  .ideas li:nth-child(odd),
  .ideas li:nth-child(even) {
    padding: 20px 0;
    border-left: 0;
  }

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