:root {
  --paper: #f6f1e8;
  --paper-2: #efe6d8;
  --ink: #1c1f24;
  --muted: #5c5a55;
  --line: #d8cfc0;
  --card: #fffdf8;
  --accent: #c45c26;
  --accent-soft: #f3dfcf;
  --danger: #b42318;
  --ok: #2f6b4f;
  --sidebar: #16181c;
  --sidebar-text: #e8e2d6;
  --sidebar-muted: #9a9386;
  --shadow: 0 18px 40px rgba(28, 31, 36, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: "Malgun Gothic", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  line-height: 1.65;
}

a { color: inherit; }

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--sidebar);
  color: var(--sidebar-text);
  padding: 28px 20px 32px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
}

.brand {
  display: block;
  text-decoration: none;
  margin-bottom: 28px;
}

.brand-kicker {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: 6px;
}

.brand-title {
  display: block;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand-sub {
  display: block;
  margin-top: 6px;
  color: var(--sidebar-muted);
  font-size: 13px;
}

.nav-label {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--sidebar-muted);
  margin: 8px 4px 10px;
}

.nav a {
  display: block;
  text-decoration: none;
  color: var(--sidebar-text);
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 14px;
}

.nav a:hover,
.nav a.is-active {
  background: #23262c;
}

.nav a.is-active {
  box-shadow: inset 3px 0 0 var(--accent);
}

.menu-toggle {
  display: none;
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 20;
  border: 0;
  background: var(--ink);
  color: #fff;
  padding: 10px 14px;
  border-radius: 999px;
  font-size: 13px;
}

.main {
  padding: 48px 56px 80px;
}

.wrap { max-width: 860px; }

.kicker {
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.16em;
  font-weight: 700;
  margin: 0 0 10px;
}

h1 {
  margin: 0 0 12px;
  font-size: 36px;
  letter-spacing: -0.04em;
  line-height: 1.25;
}

.lede {
  color: var(--muted);
  font-size: 17px;
  margin: 0 0 32px;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  margin-bottom: 40px;
  align-items: end;
}

.hero-card,
.note,
.step,
.pager,
.task-card {
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero-card,
.note {
  padding: 22px 24px;
  border-radius: 16px;
}

.hero-card strong { display: block; margin-bottom: 6px; }
.hero-card p, .note p { margin: 0; color: var(--muted); }

.task-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.task-card {
  display: block;
  text-decoration: none;
  padding: 18px 18px 16px;
  border-radius: 14px;
}

.task-card:hover { border-color: #c4b7a2; }
.task-num {
  display: block;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 6px;
}
.task-card h2 {
  margin: 0 0 6px;
  font-size: 18px;
  letter-spacing: -0.03em;
}
.task-card p { margin: 0; color: var(--muted); font-size: 14px; }

.steps { display: grid; gap: 16px; margin: 28px 0; }

.step {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: 18px 20px;
  border-radius: 14px;
}

.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
}

.step h2 {
  margin: 4px 0 6px;
  font-size: 18px;
}

.step p { margin: 0; color: var(--muted); }

.secret {
  display: inline-block;
  margin-top: 8px;
  padding: 4px 8px;
  background: var(--accent-soft);
  border-radius: 6px;
  font-family: Consolas, "Courier New", monospace;
  font-weight: 700;
}

.figure {
  margin: 18px 0 8px;
}

.figure img,
.figure video {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #111;
  display: block;
}

.figure img { background: #fff; }

.video-block {
  margin: 0 0 28px;
}

.video-block > h2 {
  margin: 0 0 12px;
  font-size: 18px;
  letter-spacing: -0.03em;
}

.video-grid {
  display: grid;
  gap: 16px;
}

@media (min-width: 820px) {
  .video-grid.two { grid-template-columns: 1fr 1fr; }
}

.task-card .has-video {
  display: inline-block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--accent);
  font-weight: 700;
}

.caption {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 36px;
  padding: 16px;
  border-radius: 14px;
}

.pager a { text-decoration: none; }
.pager span { display: block; color: var(--muted); font-size: 12px; }
.pager strong { display: block; margin-top: 2px; }

.warn {
  border-left: 4px solid var(--danger);
}

.ok {
  border-left: 4px solid var(--ok);
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(86vw, 320px);
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    z-index: 15;
  }
  .sidebar.is-open { transform: none; }
  .menu-toggle { display: block; }
  .main { padding: 72px 20px 48px; }
  .hero, .task-grid { grid-template-columns: 1fr; }
  h1 { font-size: 28px; }
}