:root {
  --paper: #f4f1e9;
  --white: #fffdf8;
  --ink: #17211d;
  --muted: #69726d;
  --line: #d1cec4;
  --accent: #2b66f6;
  --accent-soft: #e7edff;
  --forest: #163f32;
  --acid: #d9ff42;
  --orange: #ff6a3d;
  --sans: Inter, Pretendard, "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
  --serif: Iowan Old Style, "Noto Serif KR", "AppleMyungjo", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
body.camp { --accent: #7b9a00; --accent-soft: #edf4cf; }
body.collaboration-course { --accent: #0e7c7b; --accent-soft: #dff2ed; }
a { color: inherit; }

.course-header {
  min-height: 72px;
  padding: 0 max(20px, calc((100vw - 1320px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--line);
}
.back-link, .header-repo { font-size: 11px; font-weight: 850; letter-spacing: .04em; text-decoration: none; }
.back-link { display: inline-flex; align-items: center; gap: 10px; text-transform: uppercase; }
.back-link span { color: var(--orange); font-size: 17px; }
.header-repo { color: var(--muted); }
.course-hero {
  position: relative;
  min-height: 580px;
  padding: 96px max(20px, calc((100vw - 1320px) / 2)) 86px;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, .55fr);
  gap: 8vw;
  align-items: end;
  overflow: hidden;
}
.course-hero::after {
  content: attr(data-number);
  position: absolute;
  z-index: -1;
  right: 2vw;
  top: -45px;
  color: color-mix(in srgb, var(--accent) 11%, transparent);
  font-size: min(31vw, 410px);
  line-height: 1;
  font-weight: 900;
  letter-spacing: -.12em;
}
.course-kicker { margin: 0 0 22px; color: var(--accent); font-size: 11px; font-weight: 900; letter-spacing: .15em; text-transform: uppercase; }
.course-hero h1 { max-width: 950px; margin: 0; font-size: clamp(45px, 6.2vw, 84px); line-height: 1.06; letter-spacing: -.065em; }
.course-intro { max-width: 560px; margin: 0 0 5px; }
.course-intro > p { margin: 0 0 27px; color: #59635d; font-size: 17px; line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.hero-actions a {
  min-height: 46px;
  padding: 0 17px;
  border: 1px solid var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-size: 11px;
  font-weight: 850;
  text-decoration: none;
}
.hero-actions a:first-child { background: var(--ink); color: #fff; }
.hero-actions a:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.stat-band {
  padding: 0 max(20px, calc((100vw - 1320px) / 2));
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}
.stat-band div { min-height: 108px; padding: 24px; border-right: 1px solid var(--line); display: grid; align-content: center; gap: 7px; }
.stat-band div:last-child { border-right: 0; }
.stat-band span { color: var(--muted); font-size: 10px; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.stat-band strong { font-size: 21px; letter-spacing: -.03em; }

.course-layout {
  max-width: 1320px;
  margin: 0 auto;
  padding: 105px 20px 120px;
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 9vw;
  align-items: start;
}
.course-nav { position: sticky; top: 26px; }
.course-nav p { margin: 0 0 18px; color: var(--orange); font-size: 10px; font-weight: 900; letter-spacing: .14em; }
.course-nav ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.course-nav li { border-bottom: 1px solid var(--line); }
.course-nav a { padding: 13px 0; display: grid; grid-template-columns: 29px 1fr; gap: 10px; color: var(--muted); font-size: 11px; line-height: 1.45; text-decoration: none; }
.course-nav a span { color: var(--accent); font-weight: 900; }
.course-nav a:hover { color: var(--ink); }
.course-search { margin: 0 0 23px; }
.course-search > label { display: block; margin-bottom: 8px; color: var(--muted); font-size: 10px; font-weight: 850; letter-spacing: .08em; }
.search-control { display: flex; border-bottom: 1px solid var(--ink); }
.search-control input { min-width: 0; width: 100%; height: 39px; padding: 0; border: 0; outline: 0; background: transparent; color: var(--ink); font: inherit; font-size: 12px; }
.search-control input::placeholder { color: #9ba19d; }
.search-control button { padding: 0 0 0 10px; border: 0; background: transparent; color: var(--accent); font: inherit; font-size: 10px; font-weight: 850; cursor: pointer; }
.search-status { display: block; min-height: 16px; margin-top: 7px; color: var(--accent); font-size: 10px; font-weight: 800; }
.reading { min-width: 0; }
.reading-intro { margin: 0 0 72px; padding: 35px; border-left: 7px solid var(--accent); background: var(--white); }
.reading-intro p { margin: 0; font-family: var(--serif); font-size: clamp(23px, 2.5vw, 34px); line-height: 1.5; letter-spacing: -.025em; }
.chapter { padding: 0 0 72px; scroll-margin-top: 28px; }
.chapter + .chapter { padding-top: 74px; border-top: 1px solid var(--line); }
.chapter-heading { display: grid; grid-template-columns: 65px 1fr; gap: 20px; align-items: start; }
.chapter-number { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%; background: var(--accent); color: #fff; font-size: 12px; font-weight: 900; }
.chapter-label { margin: 2px 0 11px; color: var(--accent); font-size: 10px; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.chapter h2 { margin: 0; font-size: clamp(30px, 3.6vw, 49px); line-height: 1.12; letter-spacing: -.055em; }
.chapter-body { margin: 30px 0 0 85px; }
.chapter-body > p { max-width: 790px; margin: 0 0 23px; color: #535d57; font-size: 16px; line-height: 1.83; }
.chapter-body code { padding: .12em .34em; background: var(--white); color: var(--accent); font-family: "SFMono-Regular", Consolas, monospace; font-size: .88em; }
.chapter[hidden], .course-nav li[hidden] { display: none; }
.search-empty { margin: 0 0 72px; padding: 28px; border: 1px dashed var(--line); background: var(--white); }
.search-empty strong, .search-empty span { display: block; }
.search-empty strong { margin-bottom: 7px; color: var(--accent); font-size: 15px; }
.search-empty span { color: var(--muted); font-size: 12px; }
.takeaways { margin: 30px 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; list-style: none; }
.takeaways li { min-height: 105px; padding: 19px; border: 1px solid var(--line); background: var(--white); }
.takeaways strong { display: block; margin-bottom: 8px; color: var(--accent); font-size: 12px; }
.takeaways span { color: #59635d; font-size: 12px; line-height: 1.62; }
.takeaways.three-up { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.table-scroll { margin: 29px 0; overflow-x: auto; border-top: 2px solid var(--ink); }
.content-table { width: 100%; border-collapse: collapse; background: var(--white); font-size: 13px; }
.content-table th, .content-table td { padding: 15px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; line-height: 1.6; }
.content-table thead th { color: var(--accent); font-size: 10px; font-weight: 900; letter-spacing: .07em; text-transform: uppercase; }
.content-table tbody th { width: 22%; color: var(--ink); font-size: 12px; }
.content-table td { color: #59635d; }
.step-list { margin: 30px 0; padding: 0; list-style: none; counter-reset: step; border-top: 1px solid var(--line); }
.step-list li { min-height: 74px; padding: 16px 0; display: grid; grid-template-columns: minmax(130px, .35fr) 1fr; gap: 22px; align-items: baseline; border-bottom: 1px solid var(--line); counter-increment: step; }
.step-list strong { color: var(--accent); font-size: 13px; }
.step-list strong::before { content: counter(step, decimal-leading-zero) "  "; color: var(--orange); font-size: 9px; letter-spacing: .06em; }
.step-list span { color: #59635d; font-size: 13px; line-height: 1.65; }
.step-list.compact { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 0; gap: 1px; background: var(--line); }
.step-list.compact li { min-height: 112px; padding: 19px; display: block; border: 0; background: var(--white); }
.step-list.compact span { display: block; margin-top: 8px; }
.week-outcome { margin: 25px 0 0; padding: 20px 23px; background: var(--accent-soft); color: #3f4b43; font-size: 13px; line-height: 1.65; }
.week-outcome strong { color: var(--accent); }
.week-link { display: inline-flex; gap: 10px; margin-top: 18px; color: var(--accent); font-size: 12px; font-weight: 900; text-underline-offset: 4px; }

.media-section {
  padding: 105px max(20px, calc((100vw - 1320px) / 2));
  background: #18201c;
  color: #f7f4ea;
}
.media-heading { display: grid; grid-template-columns: 1fr minmax(240px, 430px); gap: 40px; align-items: end; }
.media-heading p { margin: 0 0 15px; color: var(--orange); font-size: 10px; font-weight: 900; letter-spacing: .14em; }
.media-heading h2 { margin: 0; font-size: clamp(38px, 4.5vw, 62px); letter-spacing: -.055em; }
.media-heading > span { color: #a6b0aa; font-size: 13px; line-height: 1.7; }
.video-grid { margin-top: 52px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.video-card { padding: 14px; border: 1px solid #39453f; background: #202a25; }
.video-card video { width: 100%; aspect-ratio: 16/9; display: block; background: #0f1512; object-fit: cover; }
.video-card h3 { margin: 15px 5px 5px; font-size: 15px; }
.video-card p { margin: 0 5px 5px; color: #9ca7a0; font-size: 11px; line-height: 1.6; }
.resource-section {
  padding: 105px max(20px, calc((100vw - 1320px) / 2));
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 8vw;
  background: var(--acid);
}
.resource-section h2 { margin: 15px 0 0; font-size: clamp(38px, 4.5vw, 60px); line-height: 1.08; letter-spacing: -.055em; }
.resource-list { display: grid; gap: 8px; }
.resource-list a {
  min-height: 74px;
  padding: 0 20px;
  border: 1px solid rgba(23,33,29,.38);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-size: 13px;
  font-weight: 850;
  text-decoration: none;
}
.resource-list a:hover { background: var(--ink); color: #fff; }
.course-footer { min-height: 85px; padding: 0 max(20px, calc((100vw - 1320px) / 2)); display: flex; align-items: center; justify-content: space-between; gap: 20px; background: #18201c; color: #8e9992; font-size: 11px; }

@media (max-width: 900px) {
  .course-hero { grid-template-columns: 1fr; gap: 45px; }
  .stat-band { grid-template-columns: repeat(2, 1fr); }
  .stat-band div:nth-child(2) { border-right: 0; }
  .stat-band div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .course-layout { grid-template-columns: 1fr; }
  .course-nav { position: static; }
  .course-nav ol { display: grid; grid-template-columns: repeat(2, 1fr); }
  .course-nav li:nth-child(odd) { border-right: 1px solid var(--line); }
  .course-nav a { padding: 13px; }
  .course-search { max-width: 520px; }
  .media-heading, .resource-section { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .course-header { min-height: 64px; }
  .header-repo { display: none; }
  .course-hero { min-height: auto; padding-top: 68px; padding-bottom: 68px; }
  .course-hero h1 { font-size: 47px; }
  .course-intro > p { font-size: 15px; }
  .stat-band { padding: 0; }
  .stat-band div { min-height: 90px; padding: 17px; }
  .stat-band strong { font-size: 17px; }
  .course-layout { padding-top: 70px; padding-bottom: 80px; }
  .course-nav ol { grid-template-columns: 1fr; }
  .course-nav li:nth-child(odd) { border-right: 0; }
  .reading-intro { padding: 25px; }
  .chapter-heading { grid-template-columns: 44px 1fr; gap: 13px; }
  .chapter-number { width: 38px; height: 38px; }
  .chapter-body { margin-left: 0; }
  .takeaways, .takeaways.three-up, .video-grid, .step-list.compact { grid-template-columns: 1fr; }
  .step-list li { grid-template-columns: 1fr; gap: 7px; }
  .media-section, .resource-section { padding-top: 76px; padding-bottom: 76px; }
  .course-footer { padding-top: 23px; padding-bottom: 23px; align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }