:root {
  --bg: #f1ede3;
  --surface: #e7dfcb;
  --surface-soft: #ece6d6;
  --ink: #2a2b22;
  --ink-soft: #6b6857;
  --ink-faint: #a29d87;
  --accent: #7c6a3f;
  --accent-strong: #5b4c29;
  --on-accent: #f5efde;
  --line: #d8cfb4;
  --card-bg: #fbf9f2;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1a1810;
    --surface: #262215;
    --surface-soft: #221f14;
    --ink: #ece6d6;
    --ink-soft: #b7af98;
    --ink-faint: #7c7663;
    --accent: #cdaf74;
    --accent-strong: #e4c88e;
    --on-accent: #1a1810;
    --line: #3a3524;
    --card-bg: #211e13;
  }
}

:root[data-theme="dark"] {
  --bg: #1a1810;
  --surface: #262215;
  --surface-soft: #221f14;
  --ink: #ece6d6;
  --ink-soft: #b7af98;
  --ink-faint: #7c7663;
  --accent: #cdaf74;
  --accent-strong: #e4c88e;
  --on-accent: #1a1810;
  --line: #3a3524;
  --card-bg: #211e13;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
}

body {
  font-family: 'Gowun Dodum', 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-strong);
}

.app {
  display: flex;
  min-height: 100vh;
}

/* sidebar */
.sidebar {
  width: 300px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--line);
  padding: 24px 16px;
  overflow-y: auto;
  transition: transform 0.25s ease;
}

.sidebar-title {
  font-family: 'Gowun Batang', serif;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  padding: 0 8px 18px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
  line-height: 1.5;
}

.chapter-group {
  margin-bottom: 14px;
}

.chapter-label {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent-strong);
  padding: 6px 8px;
}

.unit {
  margin-bottom: 2px;
}

.unit-title {
  padding: 8px 8px 2px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-soft);
}

.nav-link {
  display: block;
  padding: 9px 10px;
  margin: 1px 0;
  border-radius: 9px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}

.nav-link:hover {
  background: var(--surface-soft);
  color: var(--ink);
}

.nav-link.active {
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
}

.nav-link.script {
  font-size: 13px;
  padding-left: 20px;
  color: var(--ink-soft);
}

.nav-link.script::before {
  content: '· ';
}

.nav-link.script.active {
  background: var(--accent-strong);
  color: var(--on-accent);
}

/* mobile toggle */
.sidebar-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 40;
  padding: 9px 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card-bg);
  color: var(--ink);
  font-family: inherit;
  font-size: 13.5px;
  cursor: pointer;
}

.sidebar-overlay {
  display: none;
}

/* content */
.content-wrap {
  flex: 1;
  min-width: 0;
  overflow-y: auto;
}

.content {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 40px 80px;
}

.meta-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 24px;
  margin-bottom: 32px;
  font-size: 14px;
  color: var(--ink-soft);
}

.meta-card .meta-row {
  display: flex;
  gap: 10px;
  padding: 3px 0;
}

.meta-card .meta-key {
  flex-shrink: 0;
  width: 70px;
  color: var(--ink-faint);
}

.type-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
}

.type-tab {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card-bg);
  color: var(--ink-soft);
  font-size: 13.5px;
  text-decoration: none;
}

.type-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
}

.md-body h1,
.md-body h2,
.md-body h3 {
  font-family: 'Gowun Batang', serif;
  font-weight: 700;
  line-height: 1.4;
}

.md-body h1 {
  font-size: 26px;
  margin: 0 0 20px;
}

.md-body h2 {
  font-size: 20px;
  margin: 36px 0 14px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

.md-body h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.md-body h3 {
  font-size: 16.5px;
  margin: 22px 0 10px;
}

.md-body p {
  margin: 0 0 14px;
}

.md-body ul,
.md-body ol {
  margin: 0 0 14px;
  padding-left: 22px;
}

.md-body li {
  margin: 4px 0;
}

.md-body blockquote {
  margin: 0 0 16px;
  padding: 4px 18px;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
  background: var(--surface-soft);
  border-radius: 0 8px 8px 0;
}

.md-body blockquote p {
  margin: 6px 0;
}

.md-body code {
  background: var(--surface-soft);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 0.9em;
}

.md-body pre {
  background: var(--surface-soft);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
}

.md-body pre code {
  background: none;
  padding: 0;
}

.md-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 20px;
  font-size: 14px;
}

.md-body th,
.md-body td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

.md-body th {
  background: var(--surface-soft);
  font-weight: 700;
}

.md-body img {
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
  display: block;
  margin: 8px 0 18px;
}

.md-body hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 28px 0;
}

.raw-md-link {
  display: inline-block;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-faint);
  text-decoration: none;
}

.raw-md-link:hover {
  color: var(--accent-strong);
}

.placeholder {
  padding: 60px 20px;
  text-align: center;
  color: var(--ink-faint);
}

@media (max-width: 880px) {
  .sidebar-toggle {
    display: flex;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 60;
    transform: translateX(-100%);
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 20px 0 40px rgba(0, 0, 0, 0.15);
  }

  .sidebar-overlay.open {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 50;
  }

  .content {
    padding: 84px 20px 60px;
  }
}