/* kooahn.com — 공통 스타일
   원칙: 흰 배경 + 차콜 글자 + 포인트 1색, 시스템 글꼴, 넓은 여백 */

:root {
  --bg: #ffffff;
  --text: #36404a;
  --muted: #6b7680;
  --line: #e4e7e9;
  --surface: #f6f8f8;
  --accent: #2e7d75;

  --measure: 680px;
  --font: system-ui, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", "맑은 고딕", "Noto Sans KR", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b2026;
    --text: #e3e7ea;
    --muted: #9aa5ae;
    --line: #2e353d;
    --surface: #222930;
    --accent: #6cbcb3;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.75;
  word-break: keep-all;
  overflow-wrap: break-word;
}

a {
  color: var(--accent);
  text-underline-offset: 3px;
}

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 20px;
}

/* 머리글 */
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 28px;
  padding-bottom: 28px;
}

.brand {
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 20px;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
}

/* 첫 화면 */
.hero {
  padding: 72px 0 56px;
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 19px;
}

/* 증거 3칸 */
.proof {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 0 0 56px;
  padding: 0;
  list-style: none;
}

.proof li {
  padding: 20px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.proof h2 {
  margin: 0 0 6px;
  font-size: 17px;
}

.proof p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

.badge {
  display: inline-block;
  font-size: 13px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 1px 10px;
}

@media (max-width: 600px) {
  .proof {
    grid-template-columns: 1fr;
  }
}

/* 본문 */
.page {
  padding-top: 48px;
  padding-bottom: 24px;
}

.page h1 {
  margin: 0 0 24px;
  font-size: 32px;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.page h2 {
  margin: 48px 0 12px;
  font-size: 21px;
}

.page ul {
  padding-left: 1.2em;
}

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

.lead {
  font-size: 19px;
}

.page h1 small {
  margin-left: 8px;
  color: var(--muted);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0;
}

.lead em {
  font-style: normal;
  color: var(--accent);
  font-weight: 600;
}

/* 숫자 3개 */
.kpis {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page .kpis li {
  margin: 0;
  padding: 16px 16px 18px;
  background: var(--surface);
  border-top: 3px solid var(--accent);
}

.kpis strong {
  display: block;
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.kpis span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

@media (max-width: 600px) {
  .kpis {
    grid-template-columns: 1fr;
  }
}

/* 대표 사례 */
.case {
  margin: 0 0 16px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.case h3 {
  margin: 0;
  font-size: 18px;
}

.case-meta {
  margin: 2px 0 14px;
  color: var(--muted);
  font-size: 14px;
}

.case dl {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 8px 12px;
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
}

.case dt {
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  padding-top: 2px;
}

.case dd {
  margin: 0;
}

.case b {
  font-weight: 600;
}

@media (max-width: 600px) {
  .case {
    padding: 18px 16px;
  }

  .case dl {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .case dd + dt {
    margin-top: 10px;
  }
}

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

.note {
  margin-top: 40px;
  color: var(--muted);
  font-size: 14px;
}

.career {
  margin: 0;
  padding: 0;
  list-style: none;
}

.career li {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.career li + li {
  margin-top: 0;
}

.career strong {
  display: block;
}

.career span {
  color: var(--muted);
  font-size: 15px;
}

/* 바닥글 */
.site-footer {
  margin-top: 48px;
  border-top: 1px solid var(--line);
}

.site-footer .wrap {
  padding-top: 24px;
  padding-bottom: 40px;
  color: var(--muted);
  font-size: 14px;
}