/* ==========================================================================
   SO-ARM101 — 공통 스타일
   ========================================================================== */

:root {
  --bg:            #0c1015;
  --bg-elev:       #131922;
  --bg-elev-2:     #1a222e;
  --bg-code:       #0a0e13;
  --border:        #253040;
  --border-soft:   #1c2532;

  --text:          #e4eaf2;
  --text-dim:      #9aa8bd;
  --text-faint:    #64748b;

  --accent:        #4ade9a;
  --accent-dim:    #2f9d6d;
  --accent-soft:   rgba(74, 222, 154, 0.12);
  --on-accent:     #06140d;   /* 강조색 위에 얹는 글자색 */
  --overlay:       rgba(10, 14, 19, 0.82);   /* 3D 화면 위에 띄우는 칩 */
  --overlay-strong: rgba(10, 14, 19, 0.88);
  --link:          #6fb5ff;

  --warn:          #fbbf5a;
  --warn-soft:     rgba(251, 191, 90, 0.10);
  --danger:        #f87171;
  --danger-soft:   rgba(248, 113, 113, 0.10);
  --info:          #7dd3fc;
  --info-soft:     rgba(125, 211, 252, 0.10);
  --task:          #c084fc;
  --task-soft:     rgba(192, 132, 252, 0.10);

  --sidebar-w:     282px;
  --radius:        10px;
  --radius-sm:     6px;

  --mono: "JetBrains Mono", "Cascadia Code", "D2Coding", ui-monospace,
          SFMono-Regular, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Pretendard", "Apple SD Gothic Neo",
          "Malgun Gothic", "Segoe UI", Roboto, sans-serif;

  color-scheme: dark;
}

/* ──────────────────────────────────────────────────────────────────────
   테마는 세 가지 상태입니다.
     data-theme 없음  → 운영체제 설정을 따릅니다 (기본값)
     data-theme="light" → 항상 밝게
     data-theme="dark"  → 항상 어둡게
   아래 두 라이트 블록은 **같은 값을 유지**해야 합니다.
   ────────────────────────────────────────────────────────────────────── */

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg:          #f7f9fc;
    --bg-elev:     #ffffff;
    --bg-elev-2:   #eef2f8;
    --bg-code:     #10151c;
    --border:      #ccd7e6;
    --border-soft: #e2e9f3;

    --text:        #17202e;
    --text-dim:    #4c5b73;
    --text-faint:  #78869d;

    --accent:      #0f7a52;
    --accent-dim:  #0b5e3e;
    --accent-soft: rgba(15, 122, 82, 0.10);
    --on-accent:   #ffffff;
    --overlay:     rgba(255, 255, 255, 0.88);
    --overlay-strong: rgba(255, 255, 255, 0.94);
    --link:        #1457b8;

    --warn:        #8a5308;
    --warn-soft:   rgba(138, 83, 8, 0.09);
    --danger:      #b32b26;
    --danger-soft: rgba(179, 43, 38, 0.09);
    --info:        #06638f;
    --info-soft:   rgba(6, 99, 143, 0.09);
    --task:        #6d31d6;
    --task-soft:   rgba(109, 49, 214, 0.09);

    color-scheme: light;
  }
}

:root[data-theme="light"] {
  --bg:          #f7f9fc;
  --bg-elev:     #ffffff;
  --bg-elev-2:   #eef2f8;
  --bg-code:     #10151c;
  --border:      #ccd7e6;
  --border-soft: #e2e9f3;

  --text:        #17202e;
  --text-dim:    #4c5b73;
  --text-faint:  #78869d;

  --accent:      #0f7a52;
  --accent-dim:  #0b5e3e;
  --accent-soft: rgba(15, 122, 82, 0.10);
  --on-accent:   #ffffff;
  --overlay:     rgba(255, 255, 255, 0.88);
  --overlay-strong: rgba(255, 255, 255, 0.94);
  --link:        #1457b8;

  --warn:        #8a5308;
  --warn-soft:   rgba(138, 83, 8, 0.09);
  --danger:      #b32b26;
  --danger-soft: rgba(179, 43, 38, 0.09);
  --info:        #06638f;
  --info-soft:   rgba(6, 99, 143, 0.09);
  --task:        #6d31d6;
  --task-soft:   rgba(109, 49, 214, 0.09);

  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 24px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------------------------------------------------------------- 사이드바 */

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-w);
  background: var(--bg-elev);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  overscroll-behavior: contain;
  z-index: 40;
  padding-bottom: 40px;
}

.sidebar::-webkit-scrollbar { width: 8px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* 브랜드 줄 — 왼쪽은 강좌 이름, 오른쪽 끝은 테마 아이콘 */
.brand-row {
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border-soft);
}

.brand {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 20px 10px 16px 18px;
  color: var(--text);
}
.brand:hover { text-decoration: none; }

.theme-icon {
  flex: none;
  display: grid;
  place-items: center;
  width: 32px; height: 32px;
  margin: 4px 14px 0 0;
  padding: 0;
  border-radius: 8px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-faint);
  cursor: pointer;
}
.theme-icon:hover {
  color: var(--accent);
  border-color: var(--border);
  background: var(--bg-elev-2);
}
.theme-icon svg { display: block; width: 17px; height: 17px; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px; height: 38px;
  flex: none;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: var(--on-accent);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: -0.3px;
}

.brand-text {
  display: flex; flex-direction: column;
  font-weight: 700; font-size: 15px; line-height: 1.25;
}
.brand-text small {
  font-weight: 500; font-size: 11.5px; color: var(--text-faint);
  letter-spacing: 0.02em;
}

.side-tools {
  display: flex; gap: 6px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-soft);
}
.side-tool {
  flex: 1;
  text-align: center;
  padding: 7px 4px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--bg-elev-2);
  border: 1px solid var(--border-soft);
  color: var(--text-dim);
}
.side-tool:hover {
  color: var(--accent); border-color: var(--accent-dim);
  text-decoration: none;
}

.theme-btn {
  flex: none;
  padding: 7px 10px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--bg-elev-2);
  border: 1px solid var(--border-soft);
  color: var(--text-dim);
  cursor: pointer;
  white-space: nowrap;
}
.theme-btn:hover { color: var(--accent); border-color: var(--accent-dim); }

.nav-part {
  display: flex; align-items: baseline; gap: 8px;
  padding: 18px 18px 6px;
  font-size: 12px; font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}
.nav-part-no {
  font-size: 10px; font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.sidebar-nav ul { list-style: none; margin: 0; padding: 0; }

.sidebar-nav li a {
  display: flex; align-items: flex-start; gap: 9px;
  padding: 6px 18px 6px 16px;
  font-size: 13.5px; line-height: 1.45;
  color: var(--text-dim);
  border-left: 2px solid transparent;
}
.sidebar-nav li a:hover {
  color: var(--text); background: var(--bg-elev-2);
  text-decoration: none;
}
.sidebar-nav li a.active {
  color: var(--accent);
  background: var(--accent-soft);
  border-left-color: var(--accent);
  font-weight: 600;
}
.sidebar-nav li a.done .nav-no::after {
  content: "✓"; margin-left: 2px; color: var(--accent);
}
.nav-no {
  flex: none;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
  padding-top: 2px;
  min-width: 18px;
}

.nav-toggle {
  display: none;
  position: fixed; top: 12px; left: 12px;
  z-index: 60;
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
}

.sidebar-scrim {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 35;
}
.sidebar-scrim.open { display: block; }

/* ------------------------------------------------------------------- 본문 */

.main {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
}

/* ------------------------------------------------------------- 홈 (hero) */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 44px;
  align-items: center;
  padding: 72px 48px 56px;
  max-width: 1280px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-block;
  font-size: 12px; font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-dim);
  padding: 5px 11px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(34px, 5.2vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 800;
}
.hero h1 span {
  background: linear-gradient(100deg, var(--accent), var(--info));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lede {
  margin: 0 0 26px;
  font-size: 16.5px;
  color: var(--text-dim);
  max-width: 54ch;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }

.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  font-size: 14.5px; font-weight: 600;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent-dim); color: var(--accent); text-decoration: none; }
.btn.primary {
  background: var(--accent); border-color: var(--accent); color: var(--on-accent);
}
.btn.primary:hover { background: var(--accent-dim); border-color: var(--accent-dim); color: var(--on-accent); }

.progress-wrap { max-width: 420px; }
.progress-bar {
  height: 7px; border-radius: 4px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border-soft);
  overflow: hidden;
}
.progress-fill {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  transition: width 0.4s ease;
}
.progress-text {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 8px;
  font-size: 12.5px; color: var(--text-faint);
}
.link-btn {
  background: none; border: none; padding: 0;
  color: var(--text-faint); font-size: 12.5px;
  cursor: pointer; text-decoration: underline;
  font-family: inherit;
}
.link-btn:hover { color: var(--accent); }

.hero-art { display: flex; flex-direction: column; gap: 10px; }
.hero-canvas-wrap {
  position: relative;
  aspect-ratio: 5 / 4;
  border-radius: 14px;
  border: 1px solid var(--border);
  background:
    radial-gradient(ellipse at 50% 120%, var(--accent-soft), transparent 62%),
    var(--bg-elev);
  overflow: hidden;
}
#heroCanvas { width: 100%; height: 100%; display: block; }
.hero-art-cap {
  text-align: center; font-size: 12px; color: var(--text-faint);
}

/* --------------------------------------------------------------- 팩트 바 */

.facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-soft);
  border-block: 1px solid var(--border-soft);
  margin-bottom: 8px;
}
.fact { background: var(--bg); padding: 22px 20px; text-align: center; }
.fact-n {
  font-family: var(--mono);
  font-size: 22px; font-weight: 700; color: var(--accent);
  letter-spacing: -0.02em;
}
.fact-l { font-size: 12.5px; color: var(--text-dim); margin-top: 3px; }

/* --------------------------------------------------------------- 로드맵 */

.roadmap, .curriculum {
  max-width: 1160px;
  margin: 0 auto;
  padding: 48px;
}
.roadmap h2, .curriculum h2 {
  font-size: 13px; font-weight: 800;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 22px;
}

.road { display: flex; flex-wrap: wrap; gap: 10px; }
.road-step {
  display: flex; align-items: center; gap: 10px;
  flex: 1 1 200px;
  padding: 14px 16px;
  border-radius: var(--radius);
  background: var(--bg-elev);
  border: 1px solid var(--border-soft);
  font-size: 13.5px; font-weight: 600;
}
.road-step b {
  display: grid; place-items: center;
  width: 26px; height: 26px; flex: none;
  border-radius: 7px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12.5px;
}

/* ------------------------------------------------------------ 커리큘럼 */

.part { margin-bottom: 40px; }
.part-head {
  display: flex; align-items: flex-start; gap: 14px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-soft);
}
.part-no {
  flex: none;
  font-family: var(--mono);
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-dim);
  padding: 4px 9px;
  border-radius: 999px;
  margin-top: 4px;
}
.part-head h3 { margin: 0; font-size: 19px; letter-spacing: -0.01em; }
.part-head p { margin: 3px 0 0; font-size: 13.5px; color: var(--text-dim); }

.part-list { display: grid; gap: 8px; }

.lesson-card {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 15px 18px;
  border-radius: var(--radius);
  background: var(--bg-elev);
  border: 1px solid var(--border-soft);
  color: var(--text);
  transition: border-color 0.15s, transform 0.15s;
}
.lesson-card:hover {
  border-color: var(--accent-dim);
  transform: translateX(3px);
  text-decoration: none;
}
.lc-no {
  flex: none;
  font-family: var(--mono);
  font-size: 15px; font-weight: 700;
  color: var(--text-faint);
  width: 26px; padding-top: 1px;
}
.lc-main { flex: 1; min-width: 0; }
.lc-title { font-size: 15.5px; font-weight: 650; letter-spacing: -0.01em; }
.lc-sum { font-size: 13.2px; color: var(--text-dim); margin-top: 2px; }
.lc-meta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 7px; }
.lc-min { font-size: 11.5px; color: var(--text-faint); font-family: var(--mono); }
.tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border-soft);
  color: var(--text-dim);
}
.lc-check {
  flex: none;
  width: 19px; height: 19px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  margin-top: 3px;
}
.lesson-card.done .lc-check {
  background: var(--accent);
  border-color: var(--accent);
  position: relative;
}
.lesson-card.done .lc-check::after {
  content: "✓";
  position: absolute; inset: 0;
  display: grid; place-items: center;
  color: var(--on-accent); font-size: 12px; font-weight: 800;
}
.lesson-card.done .lc-no { color: var(--accent); }

/* ------------------------------------------------------------- 레슨 페이지 */

.lesson { max-width: 1160px; margin: 0 auto; padding: 44px 48px 80px; }

.lesson-head { margin-bottom: 30px; }
.crumbs {
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-bottom: 10px;
}
.lesson-head h1 {
  margin: 0 0 12px;
  font-size: clamp(27px, 3.6vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.025em;
  font-weight: 800;
  display: flex; align-items: baseline; gap: 14px;
}
.lesson-no {
  font-family: var(--mono);
  font-size: 0.62em;
  color: var(--text-faint);
  font-weight: 700;
}
.lede { margin: 0; font-size: 16px; color: var(--text-dim); max-width: 68ch; }

.lesson-actions {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--border-soft);
}
.done-toggle {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13.5px; font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  cursor: pointer;
}
.done-toggle input { accent-color: var(--accent); width: 15px; height: 15px; }
.done-toggle:has(input:checked) { border-color: var(--accent-dim); color: var(--accent); }
.ghost-btn {
  font-size: 13.5px; font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-dim);
}
.ghost-btn:hover { color: var(--accent); border-color: var(--accent-dim); text-decoration: none; }

.lesson-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 216px;
  gap: 44px;
  align-items: start;
}

.lesson-body { min-width: 0; }

/* --- 목차 사이드 --- */
.lesson-toc {
  position: sticky; top: 24px;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  font-size: 13px;
  border-left: 1px solid var(--border-soft);
  padding-left: 16px;
}
.toc-title {
  font-size: 11px; font-weight: 800;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 10px;
}
.toc-links { display: flex; flex-direction: column; gap: 2px; }
.lesson-toc a {
  display: block;
  color: var(--text-dim);
  padding: 3px 0;
  line-height: 1.45;
  border-left: 2px solid transparent;
  margin-left: -17px; padding-left: 15px;
}
.lesson-toc a:hover { color: var(--text); text-decoration: none; }
.lesson-toc a.current {
  color: var(--accent); border-left-color: var(--accent); font-weight: 600;
}
.lesson-toc .toc-l3 { padding-left: 27px; font-size: 12.3px; }

/* ------------------------------------------------------------ 본문 타이포 */

.lesson-body h2 {
  margin: 46px 0 14px;
  font-size: 24px; font-weight: 750;
  letter-spacing: -0.02em;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--border-soft);
  scroll-margin-top: 20px;
}
.lesson-body h3 {
  margin: 32px 0 10px;
  font-size: 18.5px; font-weight: 700;
  letter-spacing: -0.015em;
  scroll-margin-top: 20px;
}
.lesson-body h4 {
  margin: 24px 0 8px;
  font-size: 16px; font-weight: 700;
  color: var(--text-dim);
}
.lesson-body > h2:first-child { margin-top: 0; }

.anchor {
  opacity: 0; margin-left: 8px;
  color: var(--text-faint); font-weight: 400;
  font-size: 0.7em;
}
h2:hover .anchor, h3:hover .anchor { opacity: 1; }

.lesson-body p { margin: 0 0 15px; }
.lesson-body ul, .lesson-body ol { margin: 0 0 16px; padding-left: 24px; }
.lesson-body li { margin-bottom: 6px; }
.lesson-body li > ul, .lesson-body li > ol { margin: 6px 0 4px; }

.lesson-body hr {
  border: none;
  border-top: 1px solid var(--border-soft);
  margin: 38px 0;
}

.lesson-body blockquote {
  margin: 0 0 18px;
  padding: 2px 0 2px 18px;
  border-left: 3px solid var(--accent-dim);
  color: var(--text-dim);
  font-style: italic;
}
.lesson-body blockquote p:last-child { margin-bottom: 0; }

.lesson-body code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--bg-elev-2);
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  padding: 1px 5px;
  word-break: break-word;
}

.fig {
  margin: 0 0 24px;
  padding: 18px 18px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--bg-elev);
}
.fig svg {
  display: block;
  width: 100%;
  height: auto;
}
.fig figcaption {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border-soft);
  font-size: 12.8px;
  line-height: 1.6;
  color: var(--text-faint);
  text-align: center;
}
.fig figcaption b, .fig figcaption strong { color: var(--text-dim); }

/* 도해 공통 토큰 — SVG 안에서 참조합니다 */
.fig svg text { font-family: var(--sans); }
.fig svg .mono { font-family: var(--mono); }
.fig svg .lbl { font-size: 13px; fill: var(--text); }
.fig svg .sub { font-size: 11.5px; fill: var(--text-faint); }
.fig svg .tag { font-size: 11px; fill: var(--text-dim); }
.fig svg .hi  { fill: var(--accent); }
.fig svg .wr  { fill: var(--warn); }
.fig svg .dg  { fill: var(--danger); }
.fig svg .ln  { stroke: var(--border); fill: none; }
.fig svg .ln-hi { stroke: var(--accent); fill: none; }
.fig svg .box { fill: var(--bg-elev-2); stroke: var(--border); }
.fig svg .box-hi { fill: var(--accent-soft); stroke: var(--accent-dim); }

@media (max-width: 560px) {
  .fig { padding: 12px 10px 10px; }
  .fig svg .lbl { font-size: 15px; }
  .fig svg .sub { font-size: 13px; }
  .fig svg .tag { font-size: 12.5px; }
}

.lesson-body img {
  max-width: 100%; height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
}

/* --- 코드 블록 --- */

.code-block {
  margin: 0 0 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--bg-code);
}
.code-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border);
}
.code-lang {
  font-family: var(--mono);
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-faint);
}
.copy-btn {
  font-family: inherit;
  font-size: 11.5px; font-weight: 600;
  padding: 3px 10px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-faint);
  cursor: pointer;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent-dim); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent); }

.code-block pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.68;
  color: #d6e2f0;
}
.code-block code {
  background: none; border: none; padding: 0;
  font-size: inherit; color: inherit;
  white-space: pre;
}

/* --- 표 --- */

.table-wrap {
  margin: 0 0 20px;
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
}
.lesson-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.8px;
}
.lesson-body th {
  text-align: left;
  padding: 10px 14px;
  background: var(--bg-elev-2);
  border-bottom: 1px solid var(--border);
  font-weight: 700;
  font-size: 13px;
  white-space: nowrap;
}
.lesson-body td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--border-soft);
  vertical-align: top;
}
.lesson-body tbody tr:last-child td { border-bottom: none; }
.lesson-body tbody tr:hover { background: var(--bg-elev); }

/* --- 콜아웃 --- */

.callout {
  margin: 0 0 20px;
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  border-left-width: 3px;
  background: var(--bg-elev);
}
.callout-title {
  font-size: 12px; font-weight: 800;
  letter-spacing: 0.06em;
  margin-bottom: 7px;
}
.callout-body > *:last-child { margin-bottom: 0; }
.callout-body p { margin-bottom: 9px; }
.callout-body ul, .callout-body ol { margin-bottom: 9px; }

.callout-tip    { border-left-color: var(--accent); background: var(--accent-soft); }
.callout-tip    .callout-title { color: var(--accent); }
.callout-info   { border-left-color: var(--info); background: var(--info-soft); }
.callout-info   .callout-title { color: var(--info); }
.callout-warn   { border-left-color: var(--warn); background: var(--warn-soft); }
.callout-warn   .callout-title { color: var(--warn); }
.callout-danger { border-left-color: var(--danger); background: var(--danger-soft); }
.callout-danger .callout-title { color: var(--danger); }
.callout-check  { border-left-color: var(--accent); background: var(--accent-soft); }
.callout-check  .callout-title { color: var(--accent); }
.callout-task   { border-left-color: var(--task); background: var(--task-soft); }
.callout-task   .callout-title { color: var(--task); }

.callout-check input[type="checkbox"],
.callout-body input[type="checkbox"] { accent-color: var(--accent); }

/* --- 페이저 --- */

.pager {
  display: flex; gap: 12px;
  margin-top: 54px;
  padding-top: 24px;
  border-top: 1px solid var(--border-soft);
}
.pager a, .pager span {
  flex: 1;
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--bg-elev);
  color: var(--text);
  font-size: 14.5px; font-weight: 600;
  display: flex; flex-direction: column; gap: 3px;
}
.pager a:hover { border-color: var(--accent-dim); text-decoration: none; color: var(--accent); }
.pager span:not(.disabled) { display: block; }
.pager a span {
  all: unset;
  font-size: 11.5px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-faint);
}
.pager-next { text-align: right; align-items: flex-end; }
.pager .disabled { background: transparent; border-color: transparent; }

/* ---------------------------------------------------------------- 푸터 */

.site-foot {
  max-width: 1160px;
  margin: 0 auto;
  padding: 36px 48px 64px;
  border-top: 1px solid var(--border-soft);
  font-size: 13px;
  color: var(--text-faint);
}
.site-foot p { margin: 0 0 10px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 16px; }

/* ------------------------------------------------------------- 반응형 */

@media (max-width: 1180px) {
  .lesson-grid { grid-template-columns: minmax(0, 1fr); }
  .lesson-toc { display: none; }
}

@media (max-width: 1000px) {
  .hero { grid-template-columns: 1fr; padding: 56px 32px 40px; }
  .hero-art { order: -1; max-width: 420px; }
  .facts { grid-template-columns: repeat(2, 1fr); }
  .roadmap, .curriculum, .site-foot { padding: 36px 32px; }
  .lesson { padding: 36px 32px 64px; }
}

@media (max-width: 860px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    width: 280px;
  }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; padding-top: 56px; }
  .nav-toggle { display: block; }
}

@media (max-width: 560px) {
  body { font-size: 15.5px; }
  .hero { padding: 40px 16px 32px; }
  .roadmap, .curriculum, .site-foot { padding: 28px 16px; }
  .lesson { padding: 24px 16px 48px; }
  .facts { grid-template-columns: 1fr 1fr; }
  .lesson-body h2 { font-size: 21px; }
  .pager { flex-direction: column; }
  .lesson-card { padding: 13px 14px; gap: 12px; }
  .code-block pre { font-size: 12.2px; padding: 12px 13px; }
}

/* 본문 속 버튼 링크  @btn[주소] 라벨 */
.cta-row { margin: 18px 0 22px; }
.ghost-btn.cta {
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 650;
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.ghost-btn.cta:hover {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
  color: var(--on-accent);
}

/* 홈 미니 뷰어가 실제 메시로 올라가면 이 캔버스가 위에 깔립니다 */
.hero-gl { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }