:root {
  color-scheme: light;
  --ink: #18322c;
  --muted: #53655f;
  --paper: #f5f1e8;
  --card: #fffdf8;
  --accent: #e85d3f;
  --accent-dark: #b83c25;
  --line: #cfd5cb;
  --serif: Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 85% 8%, rgba(232, 93, 63, 0.12), transparent 24rem),
    var(--paper);
  font-family: var(--sans);
  line-height: 1.7;
}

a { color: var(--ink); text-underline-offset: 0.2em; }
a:hover { color: var(--accent-dark); }
a:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
  border-radius: 2px;
}

.site-header,
footer {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-header { min-height: 88px; border-bottom: 1px solid var(--line); }
.brand { font-family: var(--serif); font-size: 1.35rem; font-weight: 700; text-decoration: none; }
nav, footer div { display: flex; flex-wrap: wrap; gap: 22px; }
nav a { font-size: 0.9rem; font-weight: 650; text-decoration: none; }
nav a[aria-current="page"] { color: var(--accent-dark); }

main { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.hero { padding: clamp(80px, 12vw, 150px) 0 clamp(72px, 10vw, 120px); max-width: 880px; }
.eyebrow { margin-bottom: 20px; color: var(--accent-dark); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.16em; text-transform: uppercase; }
h1, h2 { font-family: var(--serif); line-height: 1.15; }
h1 { margin: 0; max-width: 18ch; font-size: clamp(3.2rem, 8vw, 7.1rem); font-weight: 500; letter-spacing: -0.055em; }
h1 span { color: var(--accent-dark); }
.lead { max-width: 650px; margin: 34px 0; color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.25rem); }

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  font-weight: 750;
  text-decoration: none;
  transition: transform 150ms ease, background 150ms ease;
}
.button:hover { color: #fff; background: var(--accent-dark); transform: translateY(-2px); }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-grid article { min-height: 260px; padding: 34px; border-right: 1px solid var(--line); }
.feature-grid article:last-child { border-right: 0; }
.feature-grid .number { color: var(--accent-dark); font-family: var(--serif); font-size: 1rem; }
.feature-grid h2 { margin: 58px 0 12px; font-size: 1.55rem; }
.feature-grid p { margin: 0; color: var(--muted); }

.document { max-width: 780px; padding: clamp(64px, 10vw, 110px) 0 80px; }
.document h1 { max-width: none; font-size: clamp(2.7rem, 7vw, 5.5rem); }
.document h2 { margin: 48px 0 12px; font-size: 1.55rem; }
.document p { color: #344842; }
.document .updated { margin: 18px 0 52px; color: var(--muted); font-size: 0.9rem; }
.language-note { margin-top: 64px; padding: 28px; border-left: 4px solid var(--accent); background: var(--card); }
.language-note h2 { margin-top: 0; }

.support { max-width: 900px; }
.contact-card { margin: 52px 0 70px; padding: clamp(26px, 5vw, 44px); display: flex; align-items: center; justify-content: space-between; gap: 28px; border: 1px solid var(--line); background: var(--card); }
.contact-card h2 { margin: 0 0 8px; }
.contact-card p { margin: 0; }
.contact-card .button { flex: 0 0 auto; }
.faq { border-top: 1px solid var(--line); }
.faq > h2 { margin-bottom: 28px; }
details { border-bottom: 1px solid var(--line); padding: 22px 0; }
summary { cursor: pointer; font-weight: 750; }
details p { margin-bottom: 0; }

footer { min-height: 130px; margin-top: 80px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.86rem; }
footer a { color: var(--muted); }

@media (max-width: 720px) {
  .site-header { min-height: 76px; align-items: flex-start; padding: 20px 0; }
  nav { justify-content: flex-end; gap: 8px 16px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .feature-grid article:last-child { border-bottom: 0; }
  .feature-grid h2 { margin-top: 28px; }
  .contact-card { align-items: stretch; flex-direction: column; }
  .contact-card .button { align-self: flex-start; word-break: break-all; }
  footer { align-items: flex-start; flex-direction: column; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}