/* ============================================================
   PATIENT FUNNEL — COLUMN (칼럼) Design System
   문석준 1인칭 시그니처 에세이 섹션.
   메인(LEDGER 라이트 테마)과 같은 결, /blog/(다크)와 명확히 구분.
   Standalone stylesheet — style.css/blog.css와 함께 쓰지 않는다.
   ============================================================ */

:root {
  --paper: #F6F3EC;
  --paper-deep: #EFEAE0;
  --ink: #14120D;
  --ink-soft: #4A463C;
  --ink-faint: #7A7568;
  --green: #0E5B43;
  --green-soft: #E3EDE7;
  --mark: #F3E7BF;
  --red: #B3402E;
  --line: rgba(20, 18, 13, 0.14);
  --line-soft: rgba(20, 18, 13, 0.08);
  --f-serif: 'Noto Serif KR', 'Nanum Myeongjo', serif;
  --f-sans: 'Noto Sans KR', 'Inter', -apple-system, sans-serif;
  --e-out: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-sans);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
  overflow-wrap: break-word;
}

a { color: inherit; }
img { max-width: 100%; display: block; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: 10px 18px; z-index: 200; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

/* ---------- Header ---------- */
.col-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky; top: 0; z-index: 100;
}
.col-header__inner {
  width: min(1120px, 92%);
  margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0;
  gap: 16px;
}
.col-header__logo {
  font-family: var(--f-serif);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  display: flex; align-items: center; gap: 9px;
  white-space: nowrap;
}
.col-header__logo-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--green); flex: 0 0 auto;
}
.col-header__nav {
  display: flex; align-items: center; gap: 4px;
  flex-wrap: wrap; justify-content: flex-end;
}
.col-header__nav a {
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--ink-soft);
  padding: 7px 13px;
  border-radius: 999px;
  transition: background 0.25s var(--e-out), color 0.25s var(--e-out);
}
.col-header__nav a:hover { background: var(--green-soft); color: var(--green); }
.col-header__nav a.is-active { background: var(--ink); color: var(--paper); }

/* ---------- Column index hero ---------- */
.col-hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(720px 340px at 85% -10%, rgba(14, 91, 67, 0.07), transparent 70%),
    var(--paper);
}
.col-hero__kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--green);
  border: 1px solid rgba(14, 91, 67, 0.35);
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 22px;
}
.col-hero__title {
  font-family: var(--f-serif);
  font-size: clamp(2rem, 4.6vw, 3.3rem);
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: -0.02em;
  max-width: 21ch;
}
.col-hero__title em {
  font-style: normal;
  background: linear-gradient(transparent 62%, var(--mark) 62%);
}
.col-hero__desc {
  margin-top: 22px;
  max-width: 62ch;
  color: var(--ink-soft);
  font-size: 1.02rem;
}
.col-hero__byline {
  margin-top: 26px;
  display: flex; align-items: center; gap: 12px;
  color: var(--ink-faint);
  font-size: 0.88rem;
}
.col-hero__byline strong { color: var(--ink); font-weight: 700; }
.col-hero__byline .sep { width: 26px; height: 1px; background: var(--line); }

/* ---------- Column index list ---------- */
.col-list { padding: 56px 0 88px; }
.col-list__note {
  font-size: 0.85rem; color: var(--ink-faint);
  margin-bottom: 34px;
  display: flex; align-items: center; gap: 10px;
}
.col-list__note::before {
  content: ""; width: 34px; height: 1px; background: var(--ink); display: inline-block;
}
.col-card {
  display: block;
  text-decoration: none;
  padding: 34px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background 0.3s var(--e-out);
}
.col-card:hover { background: rgba(14, 91, 67, 0.03); }
.col-card__meta {
  display: flex; align-items: center; gap: 12px;
  font-size: 0.8rem; color: var(--ink-faint);
  margin-bottom: 10px;
}
.col-card__no {
  font-family: var(--f-serif); font-weight: 800;
  color: var(--green); font-size: 0.85rem; letter-spacing: 0.06em;
}
.col-card__title {
  font-family: var(--f-serif);
  font-size: clamp(1.25rem, 2.4vw, 1.62rem);
  font-weight: 800;
  line-height: 1.42;
  letter-spacing: -0.015em;
  transition: color 0.25s var(--e-out);
}
.col-card:hover .col-card__title { color: var(--green); }
.col-card__hook {
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 0.96rem;
  max-width: 68ch;
}
.col-card__read {
  margin-top: 14px;
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.84rem; font-weight: 700; color: var(--green);
}
.col-card__read i { transition: transform 0.25s var(--e-out); }
.col-card:hover .col-card__read i { transform: translateX(4px); }

/* ---------- Article page ---------- */
.col-article-hero {
  padding: 64px 0 44px;
  border-bottom: 1px solid var(--line);
}
.col-breadcrumb {
  font-size: 0.8rem; color: var(--ink-faint);
  margin-bottom: 26px;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.col-breadcrumb a { color: var(--ink-faint); text-decoration: none; }
.col-breadcrumb a:hover { color: var(--green); }
.col-breadcrumb i { font-size: 0.6rem; }
.col-article-hero__tag {
  display: inline-block;
  font-size: 0.76rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--green);
  margin-bottom: 16px;
}
.col-article-hero__title {
  font-family: var(--f-serif);
  font-size: clamp(1.8rem, 4.2vw, 2.9rem);
  font-weight: 900;
  line-height: 1.32;
  letter-spacing: -0.02em;
  max-width: 24ch;
}
.col-article-hero__sub {
  margin-top: 18px;
  font-family: var(--f-serif);
  font-size: clamp(1.02rem, 2vw, 1.2rem);
  color: var(--ink-soft);
  line-height: 1.7;
  max-width: 56ch;
}
.col-article-hero__meta {
  margin-top: 28px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  font-size: 0.85rem; color: var(--ink-faint);
}
.col-article-hero__meta strong { color: var(--ink); font-weight: 700; }
.col-article-hero__meta .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--line); }

/* ---------- Article prose ---------- */
.col-prose {
  width: min(720px, 92%);
  margin: 0 auto;
  padding: 56px 0 40px;
}
.col-prose > p {
  margin-bottom: 1.7em;
  font-size: 1.04rem;
}
.col-prose > p:first-of-type::first-letter {
  font-family: var(--f-serif);
  font-size: 3.1em;
  font-weight: 900;
  float: left;
  line-height: 0.85;
  margin: 0.06em 0.14em 0 0;
  color: var(--green);
}
.col-prose h2 {
  font-family: var(--f-serif);
  font-size: clamp(1.35rem, 2.6vw, 1.7rem);
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -0.015em;
  margin: 2.4em 0 0.9em;
}
.col-prose h3 {
  font-family: var(--f-serif);
  font-size: 1.15rem;
  font-weight: 800;
  margin: 2em 0 0.7em;
}
.col-prose strong { font-weight: 700; }
.col-prose mark {
  background: linear-gradient(transparent 60%, var(--mark) 60%);
  color: inherit;
  padding: 0 2px;
}
.col-prose ul, .col-prose ol {
  margin: 0 0 1.7em 1.3em;
}
.col-prose li { margin-bottom: 0.55em; font-size: 1.02rem; }

/* TL;DR / 요약 박스 (AEO 타깃) */
.col-tldr {
  border: 1px solid var(--line);
  border-left: 4px solid var(--green);
  background: #FBF9F4;
  border-radius: 0 12px 12px 0;
  padding: 22px 26px;
  margin: 0 0 44px;
}
.col-tldr__label {
  font-size: 0.76rem; font-weight: 800;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--green);
  margin-bottom: 10px;
}
.col-tldr p { font-size: 0.99rem; color: var(--ink-soft); }
.col-tldr p strong { color: var(--ink); }

/* 인용/한 문장 강조 */
.col-pull {
  border: none;
  margin: 2.6em 0;
  padding: 0 0 0 26px;
  border-left: 3px solid var(--ink);
  font-family: var(--f-serif);
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
  font-weight: 800;
  line-height: 1.6;
  letter-spacing: -0.015em;
}
.col-pull cite {
  display: block; margin-top: 10px;
  font-family: var(--f-sans);
  font-style: normal; font-weight: 600;
  font-size: 0.8rem; color: var(--ink-faint);
}

/* 사고 실험/체크 박스 */
.col-box {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px 26px;
  margin: 2.2em 0;
  background: var(--paper-deep);
}
.col-box__label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.78rem; font-weight: 800;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--red);
  margin-bottom: 12px;
}
.col-box p, .col-box li { font-size: 0.97rem; color: var(--ink-soft); }
.col-box ul { margin: 0 0 0 1.2em; }
.col-box li { margin-bottom: 0.5em; }
.col-box li:last-child { margin-bottom: 0; }
.col-box p:last-child { margin-bottom: 0; }
.col-box p { margin-bottom: 1em; }

/* 구분선 */
.col-divider {
  border: none;
  text-align: center;
  margin: 3em 0;
}
.col-divider::before {
  content: "◆";
  color: var(--green);
  font-size: 0.7rem;
  letter-spacing: 1.4em;
  padding-left: 1.4em;
}

/* ---------- FAQ (AEO) ---------- */
.col-faq {
  width: min(720px, 92%);
  margin: 0 auto;
  padding: 12px 0 48px;
}
.col-faq__title {
  font-family: var(--f-serif);
  font-size: 1.35rem; font-weight: 800;
  margin-bottom: 20px;
}
.col-faq details {
  border-bottom: 1px solid var(--line-soft);
  padding: 4px 0;
}
.col-faq summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 0.99rem;
  padding: 15px 0;
  list-style: none;
  display: flex; align-items: baseline; gap: 12px;
}
.col-faq summary::-webkit-details-marker { display: none; }
.col-faq summary::before {
  content: "Q.";
  font-family: var(--f-serif);
  font-weight: 900;
  color: var(--green);
  flex: 0 0 auto;
}
.col-faq details p {
  padding: 0 0 18px 30px;
  color: var(--ink-soft);
  font-size: 0.96rem;
}

/* ---------- Author / signature ---------- */
.col-author {
  width: min(720px, 92%);
  margin: 0 auto 56px;
  border-top: 1px solid var(--line);
  padding-top: 32px;
  display: flex; gap: 18px; align-items: flex-start;
}
.col-author__badge {
  flex: 0 0 auto;
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--green);
  color: #E9F5EE;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--f-serif);
  font-weight: 900; font-size: 1.15rem;
}
.col-author__name { font-weight: 800; font-size: 0.99rem; }
.col-author__role { font-size: 0.84rem; color: var(--ink-faint); margin-top: 2px; }
.col-author__bio { font-size: 0.92rem; color: var(--ink-soft); margin-top: 10px; max-width: 56ch; }

/* ---------- Prev / next & index CTA ---------- */
.col-nav {
  width: min(720px, 92%);
  margin: 0 auto 72px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.col-nav a {
  display: block;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px;
  transition: border-color 0.25s var(--e-out), background 0.25s var(--e-out);
}
.col-nav a:hover { border-color: var(--green); background: rgba(14, 91, 67, 0.04); }
.col-nav a .lbl {
  font-size: 0.74rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-faint);
  display: block; margin-bottom: 8px;
}
.col-nav a .ttl {
  font-family: var(--f-serif); font-weight: 800;
  font-size: 0.96rem; line-height: 1.5;
}
.col-nav a.is-index { text-align: center; }
.col-nav a.is-index .ttl { color: var(--green); }

/* ---------- CTA strip ---------- */
.col-cta {
  border-top: 1px solid var(--line);
  background: var(--ink);
  color: #EDEAE2;
  padding: 56px 0;
}
.col-cta__inner {
  width: min(720px, 92%); margin: 0 auto;
  text-align: center;
}
.col-cta__title {
  font-family: var(--f-serif);
  font-size: clamp(1.3rem, 2.8vw, 1.7rem);
  font-weight: 800; line-height: 1.5;
}
.col-cta__desc { margin-top: 12px; font-size: 0.94rem; color: rgba(237, 234, 226, 0.72); }
.col-cta__btn {
  display: inline-flex; align-items: center; gap: 10px;
  margin-top: 26px;
  background: var(--mark); color: var(--ink);
  font-weight: 800; font-size: 0.95rem;
  text-decoration: none;
  padding: 14px 28px;
  border-radius: 999px;
  transition: transform 0.25s var(--e-out), box-shadow 0.25s var(--e-out);
}
.col-cta__btn:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(0, 0, 0, 0.35); }

/* ---------- Footer ---------- */
.col-footer {
  background: var(--ink);
  color: rgba(237, 234, 226, 0.62);
  border-top: 1px solid rgba(237, 234, 226, 0.12);
  padding: 34px 0 44px;
  font-size: 0.8rem;
  line-height: 1.9;
}
.col-footer a { color: rgba(237, 234, 226, 0.82); text-decoration: none; }
.col-footer a:hover { text-decoration: underline; }
.col-footer__links {
  display: flex; gap: 16px; flex-wrap: wrap;
  margin-bottom: 14px;
  font-weight: 600;
}
.col-footer__biz { max-width: 72ch; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .col-header__nav a { padding: 6px 10px; font-size: 0.8rem; }
  .col-hero { padding: 52px 0 40px; }
  .col-article-hero { padding: 44px 0 36px; }
  .col-prose { padding: 40px 0 28px; }
  .col-prose > p { font-size: 1rem; }
  .col-nav { grid-template-columns: 1fr; }
  .col-author { flex-direction: row; }
  .col-pull { padding-left: 18px; }
}