:root {
  color-scheme: light;
  --paper: #f6f0e5;
  --paper-deep: #ece2d2;
  --ink: #24211d;
  --muted: #6e675e;
  --line: #d8ccbb;
  --rust: #a84f34;
  --sage: #5f765f;
  --cobalt: #315e86;
  --white: #fffdf8;
  --shadow: 0 18px 50px rgb(60 48 35 / 12%);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: clip;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent 0 47px, rgb(168 79 52 / 8%) 48px, transparent 49px),
    linear-gradient(var(--paper), #f9f4eb 48%, var(--paper));
  font-family: ui-serif, Georgia, "Times New Roman", serif;
  line-height: 1.65;
}

a {
  color: var(--cobalt);
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--rust);
}

.skip-link {
  position: absolute;
  z-index: 10;
  top: -80px;
  left: 16px;
  padding: 10px 14px;
  color: var(--white);
  background: var(--ink);
  border-radius: 8px;
}

.skip-link:focus {
  top: 12px;
}

.site-header,
.site-footer,
.page {
  width: min(1120px, calc(100% - 32px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 22px;
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--rust);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.84rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-decoration: none;
  text-transform: uppercase;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.9rem;
}

.nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 800;
  text-decoration-color: var(--rust);
  text-decoration-thickness: 2px;
}

.page {
  padding-block: 64px 88px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  align-items: center;
  gap: clamp(36px, 8vw, 100px);
  min-height: 520px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--rust);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.16;
  text-wrap: balance;
}

h1 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(2.7rem, 7vw, 5.8rem);
  letter-spacing: -0.045em;
}

h2 {
  margin: 0 0 18px;
  font-size: clamp(1.75rem, 4vw, 2.7rem);
  letter-spacing: -0.025em;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.12rem;
}

.lede {
  max-width: 64ch;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 10px 18px;
  border: 1px solid var(--ink);
  border-radius: 12px;
  color: var(--white);
  background: var(--ink);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 800;
  text-decoration: none;
}

.button.secondary {
  color: var(--ink);
  background: transparent;
}

.card-stack {
  position: relative;
  min-height: 330px;
}

.stack-sheet {
  position: absolute;
  inset: 34px 0 0 20px;
  border: 1px solid var(--line);
  border-radius: 28px 12px 28px 12px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.stack-sheet:nth-child(1) {
  transform: rotate(7deg) translate(20px, 8px);
  border-top: 8px solid var(--cobalt);
}

.stack-sheet:nth-child(2) {
  transform: rotate(-5deg) translate(-18px, 18px);
  border-top: 8px solid var(--sage);
}

.stack-sheet:nth-child(3) {
  display: grid;
  place-items: center;
  padding: 32px;
  transform: rotate(1deg);
  border-top: 8px solid var(--rust);
  text-align: center;
}

.stack-word {
  display: block;
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 800;
}

.stack-note {
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.92rem;
}

.section {
  padding-block: 52px;
  border-top: 1px solid var(--line);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.paper-card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 18px 8px 18px 8px;
  background: rgb(255 253 248 / 82%);
  box-shadow: 0 8px 22px rgb(60 48 35 / 7%);
}

.paper-card.rust { border-top: 5px solid var(--rust); }
.paper-card.sage { border-top: 5px solid var(--sage); }
.paper-card.cobalt { border-top: 5px solid var(--cobalt); }

.metric {
  display: block;
  margin-bottom: 6px;
  font-size: 2rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.document {
  max-width: 820px;
  margin-inline: auto;
  padding: clamp(24px, 6vw, 64px);
  border: 1px solid var(--line);
  border-radius: 24px 10px 24px 10px;
  background: rgb(255 253 248 / 88%);
  box-shadow: var(--shadow);
}

.document h1 {
  max-width: 18ch;
  font-size: clamp(2.2rem, 6vw, 4.3rem);
}

.document h2 {
  margin-top: 48px;
  font-size: 1.75rem;
}

.document h3 {
  margin-top: 28px;
}

.notice {
  margin-block: 28px;
  padding: 18px 20px;
  border-left: 5px solid var(--rust);
  border-radius: 6px 12px 12px 6px;
  background: var(--paper-deep);
}

.details {
  display: grid;
  grid-template-columns: minmax(150px, 0.35fr) minmax(0, 0.65fr);
  margin-block: 24px;
  border-top: 1px solid var(--line);
}

.details dt,
.details dd {
  margin: 0;
  padding: 14px 10px;
  border-bottom: 1px solid var(--line);
}

.details dt {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-weight: 800;
}

.table-wrap {
  overflow-x: auto;
  margin-block: 24px;
}

table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}

th,
td {
  padding: 13px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.86rem;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 26px 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.86rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

code {
  padding: 0.12em 0.35em;
  border-radius: 5px;
  background: var(--paper-deep);
  font-size: 0.92em;
}

/* 과정 단어 목록 표: 짧은 칸(과정·단어 수·이용 조건·파일)은 한 줄로 */
.word-lists th:not(:nth-child(3)),
.word-lists td:not(:nth-child(3)) {
  white-space: nowrap;
}

@media (max-width: 760px) {
  body {
    background: linear-gradient(var(--paper), #f9f4eb 48%, var(--paper));
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    justify-content: flex-start;
  }

  .page {
    padding-block: 38px 64px;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .card-stack {
    min-height: 290px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .details {
    grid-template-columns: 1fr;
  }

  .details dt {
    padding-bottom: 2px;
    border-bottom: 0;
  }

  .details dd {
    padding-top: 2px;
  }
}

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