:root {
  --paper: #f7f4ee;
  --ink: #2b2620;
  --ink-soft: #5c5346;
  --accent: #8a3324;
  --accent-soft: #f1e6de;
  --line: #ddd5c5;
  --card: #ffffff;
  --sans: "Pretendard", -apple-system, BlinkMacSystemFont, "Malgun Gothic", sans-serif;
  --serif: "Noto Serif KR", "Nanum Myeongjo", Georgia, serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 96px 24px 80px;
}
.mark {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 28px;
}
.mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
header.site {
  border-bottom: 1px solid var(--line);
  padding-bottom: 32px;
  margin-bottom: 40px;
}
.eyebrow {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
h1 {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}
h1 a { color: inherit; text-decoration: none; }
.en-name {
  font-family: var(--sans);
  font-size: 16px;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  margin-bottom: 24px;
}
nav.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  font-family: var(--sans);
  font-size: 14px;
}
nav.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}
nav.site-nav a:hover, nav.site-nav a.current {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
section {
  margin-bottom: 72px;
  scroll-margin-top: 24px;
}
h2 {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
h2.section-title {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--ink);
  border-bottom: 2px solid var(--line);
  padding-bottom: 14px;
  margin-bottom: 24px;
}
h2 a.section-link {
  color: inherit;
  text-decoration: none;
}
h2 a.section-link:hover { color: var(--accent); }
h2 a.section-link .arrow { opacity: 0; transition: opacity .15s; }
h2 a.section-link:hover .arrow { opacity: 1; }
p.lead {
  font-size: 19px;
  line-height: 1.9;
  color: var(--ink);
}
p.section-note {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 24px;
}
.page-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}
.page-lead {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink-soft);
  margin-bottom: 40px;
}

/* ---- Simple summary list (메인 페이지 전용) ---- */
ul.simple-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
}
ul.simple-list li a.item-link {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 12px 4px;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}
ul.simple-list li a.item-link:hover { color: var(--accent); }
ul.simple-list .item-title { font-size: 17px; }
ul.simple-list .item-sub {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-soft);
  white-space: nowrap;
  flex: 0 0 auto;
}
a.see-all {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}
a.see-all:hover { text-decoration: underline; }

/* ---- Cards (books / apps / projects — 상세 페이지 전용) ---- */
.card-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 18px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.cover {
  flex: 0 0 auto;
  width: 60px;
  height: 82px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 22px;
  overflow: hidden;
}
.cover img { width: 100%; height: 100%; object-fit: cover; }
.card-body { flex: 1 1 auto; min-width: 0; }
.card-body h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 2px;
}
.card-sub {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.card-desc {
  font-size: 14px;
  color: var(--ink);
  margin-bottom: 8px;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}
.tag {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 3px 10px;
}
.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-family: var(--sans);
  font-size: 16px;
}
.card-links a {
  text-decoration: none;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  font-weight: 600;
}
.card-links a::after {
  content: '↗';
  display: inline-block;
  margin-left: 3px;
  font-size: 0.8em;
  opacity: 0.55;
}
.card-links a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.card-links a:hover::after { opacity: 1; }

.card-wrap {
  display: flex;
  gap: 12px;
  align-items: stretch;
}
.card-wrap .card {
  margin: 0;
}
.card-main {
  flex: 1 1 auto;
  min-width: 0;
}
.card-actions-box {
  flex: 0 0 auto;
  width: 168px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
}
.card-actions-box .btn-download {
  width: 100%;
  justify-content: center;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  white-space: nowrap;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 4px;
  border: none;
  cursor: pointer;
}
.btn-download:hover { opacity: 0.88; }
.btn-download svg { width: 14px; height: 14px; }
.btn-download.small { padding: 6px 12px; font-size: 13px; }
.btn-download.outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}
.btn-download.outline:hover { opacity: 1; background: var(--accent-soft); }

/* ---- Code viewer (코딩 도서 예제 코드) ---- */
.code-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.code-list[hidden] {
  display: none;
}
.code-block {
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}
.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.lang-badge {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 2px 9px;
  border-radius: 100px;
}
.lang-badge.python { color: #0F6E56; background: #E1F5EE; }
.lang-badge.c { color: #185FA5; background: #E6F1FB; }
.lang-badge.js { color: #854F0B; background: #FAEEDA; }
.copy-btn {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.code-block pre {
  margin: 0;
  padding: 14px 16px;
  background: #fbfaf7;
  font-family: Consolas, Monaco, "D2Coding", monospace;
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--ink);
}
.code-note {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 12px;
}

/* ---- Tables (사업자정보 / 자료실 공용) ---- */
table.info {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 15px;
}
table.info tr { border-bottom: 1px solid var(--line); }
table.info tr:last-child { border-bottom: none; }
table.info th, table.info td { text-align: left; padding: 12px 0; vertical-align: top; }
table.info th { width: 150px; color: var(--ink-soft); font-weight: 500; }
table.info td { color: var(--ink); }

/* ---- Legal pages (개인정보처리방침 / 이용약관) ---- */
.legal h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 28px 0 10px;
}
.legal p, .legal li {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink);
  margin-bottom: 8px;
}
.legal ul, .legal ol { padding-left: 20px; margin-bottom: 12px; }
.legal .updated {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 32px;
}

/* ---- Footer ---- */
footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-soft);
}
footer .footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-bottom: 12px;
}
footer .footer-links a {
  color: var(--ink-soft);
  text-decoration: none;
}
footer .footer-links a:hover { color: var(--accent); }
a { color: var(--accent); }

@media (max-width: 520px) {
  h1 { font-size: 30px; }
  .wrap { padding: 48px 20px 64px; }
  table.info th { width: 110px; }
  .card { flex-direction: column; }
  .cover { width: 50px; height: 68px; }
  ul.simple-list li a.item-link { flex-direction: column; align-items: flex-start; gap: 2px; }
}
@media (max-width: 620px) {
  .card-wrap { flex-direction: column; }
  .card-actions-box { width: 100%; }
}