:root {
  --leading: 28px;
  --half: 14px;
  --edge: clamp(20px, 5vw, 72px);
  --measure: 56ch;
  --ko: 'Archivo', 'Pretendard Variable', Pretendard, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  --sub: color-mix(in srgb, var(--color-text) 72%, transparent);
}
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; text-wrap: pretty; font-family: var(--ko); word-break: keep-all; font-size: 17px; line-height: var(--leading); }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--color-accent); }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 var(--edge); }

/* nav */
.nav { position: sticky; top: 0; z-index: 50; background: var(--color-bg);
  padding-inline: max(var(--edge), calc((100% - 1200px) / 2 + var(--edge))); }
.nav a { white-space: nowrap; display: inline-flex; align-items: center; gap: 6px; }
.nav a[aria-current='page'] { color: var(--color-accent); }
.nav-brand { font-family: var(--ko); }
.nav-brand small { font-size: 11px; letter-spacing: 0.3em; margin-left: 4px; }
@media (max-width: 720px) { .nav a:not(.nav-brand):not(.btn) { display: none; } }

.rule2 { height: 2px; border: 0; margin: 0; background: var(--color-divider); }
.kicker { display: block; font-size: 13px; line-height: var(--half); letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--color-accent-700); margin: 0 0 var(--half); }

/* hero */
.hero { padding: calc(4 * var(--leading)) 0 calc(3 * var(--leading)); }
.display { font-family: var(--ko); font-weight: var(--font-heading-weight);
  font-size: clamp(40px, 6vw, 80px); line-height: 1.14; letter-spacing: -0.035em; margin: 0; }
.display .line { display: block; }
.hero .sub { font-size: 18px; line-height: 30px; max-width: var(--measure); margin: var(--leading) 0 0; color: var(--sub); }
.row { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-top: var(--leading); }
.btn-lg { min-height: 48px; padding-inline: 22px; font-size: 15px; }

/* section */
.sec { padding: calc(3 * var(--leading)) 0; }
.sec-head { margin-bottom: calc(1.5 * var(--leading)); }
.sec-title { font-family: var(--ko); font-weight: var(--font-heading-weight);
  font-size: clamp(28px, 3.2vw, 40px); line-height: 1.25; letter-spacing: -0.03em; margin: 0; }
.sec-note { font-size: 16px; line-height: var(--leading); margin: var(--half) 0 0; color: var(--sub); max-width: var(--measure); }

/* entry links (index) */
.entries { display: grid; grid-template-columns: 1fr 1fr; border-top: 2px solid var(--color-divider); }
.entry { display: flex; flex-direction: column; gap: var(--half); padding: calc(1.5 * var(--leading)) var(--leading) calc(1.5 * var(--leading)) 0; }
.entry + .entry { border-left: 2px solid var(--color-divider); padding-left: var(--leading); }
.entry h3 { font-family: var(--ko); font-weight: var(--font-heading-weight); font-size: clamp(26px, 2.6vw, 34px);
  line-height: 1.2; letter-spacing: -0.03em; margin: 0; display: flex; align-items: center; gap: 12px; }
.entry p { margin: 0; color: var(--sub); max-width: 40ch; }
.entry .go { margin-top: var(--half); font-weight: 700; color: var(--color-accent-700); }
.entry:hover h3 { color: var(--color-accent); }

/* ruled rows */
.feature { display: grid; grid-template-columns: minmax(48px, 120px) minmax(0, 360px) minmax(0, 1fr);
  gap: 6px clamp(24px, 4vw, 64px); align-items: baseline;
  padding: var(--leading) 0; border-top: 2px solid var(--color-divider); }
.f-num { font-family: var(--font-heading); font-weight: var(--font-heading-weight); font-size: 15px; margin: 0; color: var(--color-accent); }
.f-title { font-family: var(--ko); font-weight: var(--font-heading-weight); font-size: 22px; letter-spacing: -0.02em; margin: 0; }
.f-copy { font-size: 16px; margin: 0; color: var(--sub); }

/* steps */
.steps { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 2px solid var(--color-divider); }
.step { padding: var(--leading) 20px 0 0; }
.step + .step { border-left: 1px solid var(--color-divider); padding-left: 20px; }
.step .n { font-family: var(--font-heading); font-weight: var(--font-heading-weight); font-size: 32px; line-height: 1; color: var(--color-accent); margin: 0 0 var(--leading); }
.step h3 { font-family: var(--ko); font-weight: var(--font-heading-weight); font-size: 19px; letter-spacing: -0.02em; margin: 0 0 6px; }
.step p { font-size: 15px; line-height: 24px; margin: 0; color: var(--sub); }

/* two-column */
.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: calc(2 * var(--leading)) clamp(24px, 5vw, 96px); align-items: start; }
.figure { margin: 0; }
.figure image-slot { width: 100%; aspect-ratio: 4 / 3; display: block; }
.figure.wide image-slot { aspect-ratio: 21 / 9; }

/* info list */
.info { margin: var(--leading) 0 0; display: grid; grid-template-columns: 72px 1fr; gap: 10px 16px; font-size: 16px; line-height: 24px; }
.info dt { font-weight: 700; }
.info dd { margin: 0; color: var(--sub); }

/* form */
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; padding-top: var(--leading); border-top: 2px solid var(--color-divider); }
.form .full { grid-column: 1 / -1; }
.form .input { min-height: 46px; font-size: 15px; font-family: var(--ko); }
.form textarea.input { min-height: 140px; }
.form .btn { width: 100%; min-height: 50px; font-size: 15px; }

/* list */
.soon { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--color-divider); }
.soon li { display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: calc(0.75 * var(--leading)) 0; border-bottom: 1px solid var(--color-divider); font-size: 18px; font-weight: 600; }

/* red close */
.close { background: var(--color-accent); color: var(--color-bg); }
.close .wrap { padding-top: calc(3 * var(--leading)); padding-bottom: calc(3 * var(--leading)); }
.close h3 { font-family: var(--ko); font-weight: var(--font-heading-weight); font-size: clamp(32px, 4.4vw, 56px); line-height: 1.18; letter-spacing: -0.03em; margin: 0; }
.close h3 .line { display: block; }
.close .row { margin-top: calc(1.5 * var(--leading)); }
.close .btn-ghost { color: var(--color-bg); border-color: var(--color-bg); }
.close .btn-ghost:hover { background: color-mix(in srgb, var(--color-bg) 14%, transparent); color: var(--color-bg); }

/* footer */
footer { padding: calc(2 * var(--leading)) 0; font-size: 13px; line-height: 22px;
  color: color-mix(in srgb, var(--color-text) 70%, transparent);
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: var(--leading) clamp(24px, 5vw, 96px); }
footer .brand { font-family: var(--ko); font-weight: var(--font-heading-weight); font-size: 18px; color: var(--color-text); margin: 0 0 8px; }
footer p { margin: 0; }
footer dl { display: grid; grid-template-columns: 80px 1fr; gap: 4px 16px; margin: 0; }
footer dd { margin: 0; }
footer .copy { grid-column: 1 / -1; border-top: 1px solid var(--color-divider); padding-top: var(--half); }

/* floating */
.float { position: fixed; right: 20px; bottom: 20px; display: flex; flex-direction: column; gap: 8px; z-index: 60; }
.float .btn { width: 52px; height: 52px; padding: 0; font-size: 12px; line-height: 1.2; text-align: center; }
.float .btn-secondary { background: var(--color-bg); }

@media (max-width: 960px) {
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: var(--leading); }
  .step + .step { border-left: 0; padding-left: 0; }
}
@media (max-width: 880px) { .feature { grid-template-columns: 1fr; } }
@media (max-width: 720px) {
  .hero { padding: calc(2.5 * var(--leading)) 0 calc(2 * var(--leading)); }
  .entries, .split, footer, .form { grid-template-columns: 1fr; }
  .entry + .entry { border-left: 0; border-top: 2px solid var(--color-divider); padding-left: 0; }
  .figure.wide image-slot { aspect-ratio: 4 / 3; }
}