/* ==========================================================================
   빌캠교실 — 재작성 스타일 (Brunch × Notion)
   Phase 1: 디자인 토큰 + 쉘 + 홈
   ========================================================================== */

/* 1. 토큰 ------------------------------------------------------------------ */
:root {
  --paper        : #fcfbf7;
  --paper-warm   : #f6f4ee;
  --paper-sunk   : #f0ede4;
  --ink          : #25231f;
  --ink-muted    : #6a665d;
  --ink-soft     : #a8a498;
  --line         : #e6e2d8;
  --line-soft    : #efece4;
  --accent       : #2c5b4a;
  --accent-ink   : #1b3d31;
  --accent-soft  : #e4ece7;
  --highlight    : #f0e7c8;
  --rose-soft    : #f3e5e1;
  --amber-soft   : #f4ead0;
  --sky-soft     : #e3ebef;
  --moss-soft    : #e4ebde;

  --sidebar-bg      : #1a2340;
  --sidebar-bg-2    : #222c4c;
  --sidebar-ink     : #ece7d7;
  --sidebar-muted   : #9aa1bd;
  --sidebar-soft    : #6b7292;
  --sidebar-line    : rgba(255, 255, 255, 0.09);
  --sidebar-accent  : #8bcfbb;

  --font-serif   : "Noto Serif KR", "Nanum Myeongjo", "IBM Plex Serif", serif;
  --font-sans    : "Pretendard Variable", "Pretendard", "SUIT", "Apple SD Gothic Neo", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono    : "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --reading-col  : 680px;
  --main-max     : 920px;
  --side-w       : 268px;

  --radius-sm    : 3px;
  --radius-md    : 6px;

  --ease         : cubic-bezier(.2, .7, .2, 1);
}

/* 2. 리셋 + 기본 ---------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.8;
  letter-spacing: -0.015em;
  font-feature-settings: "ss01", "tnum";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
p { margin: 0 0 16px; }
h1, h2, h3, h4 { margin: 0; font-family: var(--font-serif); font-weight: 700; letter-spacing: -0.03em; line-height: 1.25; }
ol, ul { margin: 0; padding: 0; list-style: none; }
hr { border: 0; border-top: 1px solid var(--line); margin: 56px 0; }

::selection { background: var(--highlight); color: var(--ink); }

/* 접근성 */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 12px; top: -48px; z-index: 100;
  padding: 10px 14px; background: var(--ink); color: var(--paper);
  border-radius: var(--radius-sm); font-size: 13px;
}
.skip-link:focus { top: 12px; }

/* 3. 앱 쉘 ---------------------------------------------------------------- */
.app-shell {
  display: grid;
  grid-template-columns: var(--side-w) 1fr;
  min-height: 100vh;
}

/* 4. 상단 바 (모바일 · 태블릿) -------------------------------------------- */
.top-bar {
  position: sticky; top: 0; z-index: 40;
  display: none;
  align-items: center; justify-content: space-between;
  height: 56px; padding: 0 20px;
  background: rgba(252, 251, 247, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.top-bar .brand-mini {
  display: inline-flex; align-items: baseline; gap: 8px;
  font-family: var(--font-serif); font-size: 18px; font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  padding: 4px 6px;
  border-radius: 6px;
  transition: background 0.15s var(--ease);
}
.top-bar .brand-mini:hover,
.top-bar .brand-mini:active {
  background: var(--paper-sunk);
}
.top-bar .brand-mini small {
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  letter-spacing: 0.18em; color: var(--ink-muted); text-transform: uppercase;
}
.drawer-toggle {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; color: var(--ink-muted);
}
.drawer-toggle::before {
  content: ""; width: 18px; height: 2px; background: var(--ink);
  box-shadow: 0 5px 0 var(--ink), 0 -5px 0 var(--ink);
}

/* 5. 사이드바 -------------------------------------------------------------- */
.sidebar {
  position: sticky; top: 0; align-self: start;
  height: 100vh;
  padding: 28px 24px 24px;
  background:
    linear-gradient(180deg, var(--sidebar-bg-2) 0%, var(--sidebar-bg) 60%);
  border-right: 1px solid rgba(0, 0, 0, 0.08);
  color: var(--sidebar-ink);
  overflow-y: auto;
  font-size: 14px;
  box-shadow: inset -1px 0 0 rgba(255, 255, 255, 0.04);
}

.side-brand {
  display: flex; align-items: center; gap: 12px;
  padding: 4px 6px 22px;
  border-bottom: 1px dashed var(--sidebar-line);
  margin-bottom: 20px;
  text-decoration: none;
  color: inherit;
  border-radius: 10px;
  transition: background 0.18s var(--ease), transform 0.18s var(--ease);
}
.side-brand:hover {
  background: rgba(255, 255, 255, 0.04);
  transform: translateX(2px);
}
.side-brand:hover .brand-icon {
  transform: rotate(-4deg) scale(1.04);
}

.nav-portal-home {
  margin-bottom: 12px;
  padding: 10px 12px !important;
  font-weight: 700 !important;
  color: var(--sidebar-accent) !important;
  background: rgba(139, 207, 187, 0.08);
  border: 1px solid rgba(139, 207, 187, 0.22);
  border-radius: 10px;
  letter-spacing: -0.01em;
}
.nav-portal-home .dot { background: var(--sidebar-accent) !important; box-shadow: 0 0 8px rgba(139,207,187,0.6); }
.nav-portal-home:hover {
  background: rgba(139, 207, 187, 0.14);
  border-color: rgba(139, 207, 187, 0.4);
  transform: translateX(2px);
}

.side-brand .brand-icon {
  transition: transform 0.2s var(--ease);
  width: 30px; height: 30px; border-radius: 6px;
  background: var(--paper); color: var(--sidebar-bg);
  display: grid; place-items: center;
  font-family: var(--font-serif); font-size: 15px; font-weight: 700;
  letter-spacing: -0.02em;
}
.side-brand strong {
  display: block;
  color: var(--sidebar-ink);
  font-family: var(--font-serif); font-size: 16px; font-weight: 700;
  letter-spacing: -0.02em;
}
.side-brand small {
  display: block;
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  letter-spacing: 0.18em; color: var(--sidebar-muted); text-transform: uppercase;
  margin-top: 2px;
}

.side-nav { display: flex; flex-direction: column; gap: 4px; }

.nav-group-label {
  margin: 16px 8px 6px;
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  letter-spacing: 0.2em; color: var(--sidebar-soft); text-transform: uppercase;
}
.nav-group-label:first-child { margin-top: 0; }

.nav-item {
  position: relative;
  display: flex; align-items: center; gap: 10px;
  padding: 7px 8px;
  border-radius: var(--radius-sm);
  color: var(--sidebar-ink);
  transition: background 0.15s var(--ease), color 0.15s var(--ease);
}
.nav-item:hover { background: rgba(255, 255, 255, 0.06); color: #ffffff; }
.nav-item.is-active {
  background: rgba(255, 255, 255, 0.09);
  color: #ffffff;
  font-weight: 600;
}
.nav-item.is-active::before {
  content: ""; position: absolute; left: -24px; top: 8px; bottom: 8px;
  width: 2px; background: var(--sidebar-accent);
}
.nav-item .dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--sidebar-soft); flex-shrink: 0;
}
.nav-item.is-active .dot { background: var(--sidebar-accent); }

.side-meta {
  margin-top: 28px; padding-top: 20px;
  border-top: 1px dashed var(--sidebar-line);
  font-family: var(--font-mono); font-size: 12px; color: var(--sidebar-muted);
}
.side-meta p { margin: 0 0 4px; }
.side-meta a { color: inherit; }
.side-meta a:hover { color: var(--sidebar-accent); }

/* 6. 메인 컬럼 ------------------------------------------------------------ */
.main-col {
  min-width: 0;
  padding: 56px clamp(28px, 5vw, 72px) 96px;
}
.main-inner {
  max-width: var(--main-max);
  margin: 0 auto;
}
.reading {
  max-width: var(--reading-col);
  margin-left: 0;
}

/* 7. Cover (Brunch 식 편집형 헤드라인) ----------------------------------- */
.cover {
  padding: 40px 0 56px;
  border-bottom: 1px solid var(--line);
}
.cover-kicker {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0 0 28px;
  display: inline-flex; align-items: center; gap: 10px;
}
.cover-kicker::before {
  content: ""; width: 28px; height: 1px; background: var(--accent);
}
.cover-title {
  font-size: clamp(36px, 5.6vw, 60px);
  line-height: 1.18;
  letter-spacing: -0.04em;
  max-width: 820px;
  margin: 0 0 24px;
}
.cover-title em {
  font-style: normal;
  color: var(--accent-ink);
  position: relative;
}
.cover-title em::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0.1em; height: 0.32em;
  background: var(--highlight); z-index: -1; opacity: 0.65;
}
.cover-sub {
  font-size: 18px; line-height: 1.75;
  color: var(--ink-muted);
  max-width: 640px;
  margin: 0 0 36px;
}
.cover-meta {
  display: flex; flex-wrap: wrap; gap: 0 32px;
  padding-top: 20px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-muted);
  margin: 0;
}
.cover-meta > div { display: flex; gap: 8px; padding: 6px 0; }
.cover-meta dt { color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.14em; }
.cover-meta dd { margin: 0; color: var(--ink); font-weight: 500; }

/* 8. Pull quote ----------------------------------------------------------- */
.pull-quote {
  margin: 64px 0;
  padding: 0 0 0 40px;
  border-left: 2px solid var(--accent);
  position: relative;
}
.pull-quote::before {
  content: "\201C";
  position: absolute; left: -8px; top: -24px;
  font-family: var(--font-serif); font-size: 64px; color: var(--accent);
  line-height: 1;
}
.pull-quote blockquote {
  margin: 0;
  font-family: var(--font-serif); font-size: 26px; font-weight: 500;
  line-height: 1.55; letter-spacing: -0.025em;
  color: var(--ink);
  font-style: italic;
}
.pull-quote blockquote p { margin: 0; }
.pull-quote figcaption {
  margin-top: 14px;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-soft);
}
#hookText { transition: opacity 0.3s var(--ease); }

/* 9. Block (섹션) ---------------------------------------------------------- */
.block { padding: 72px 0; border-top: 1px solid var(--line); }
.block:first-of-type { border-top: 0; }

.block-head { margin-bottom: 36px; }
.block-num {
  display: inline-block;
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.block-head h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.25;
  max-width: 760px;
}
.block-desc {
  margin: 14px 0 0;
  font-size: 16px; color: var(--ink-muted);
  max-width: 640px;
}
.block-lead {
  font-size: 18px; line-height: 1.8;
  color: var(--ink);
  max-width: var(--reading-col);
  margin: 0 0 28px;
}

/* 10. Callout (Notion 식) ------------------------------------------------- */
.callout {
  display: grid; grid-template-columns: auto 1fr; gap: 14px;
  padding: 20px 24px;
  background: var(--paper-warm);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
}
.callout-ico {
  font-family: var(--font-serif); font-size: 20px;
  color: var(--accent); line-height: 1.3;
}
.callout strong {
  display: block;
  font-family: var(--font-serif); font-size: 16px; font-weight: 700;
  margin-bottom: 6px; letter-spacing: -0.02em;
}
.callout p { margin: 0; font-size: 15px; color: var(--ink-muted); line-height: 1.75; }
.callout ul { margin: 10px 0 0; }
.callout li {
  padding: 4px 0; font-size: 14px; color: var(--ink);
  display: grid; grid-template-columns: auto 1fr; gap: 10px;
}
.callout li span { font-weight: 600; min-width: 88px; }
.callout li span::after { content: " ·"; color: var(--ink-soft); }

/* 11. Property grid (3-up 기둥) ------------------------------------------ */
.prop-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  margin-top: 32px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.prop-card {
  padding: 28px 24px 28px 0;
  border-right: 1px dashed var(--line);
}
.prop-card:last-child { border-right: 0; }
.prop-card:not(:first-child) { padding-left: 24px; }
.prop-num {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.2em; color: var(--ink-soft);
  margin: 0 0 12px;
}
.prop-card h3 {
  font-size: 22px; margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.prop-card p {
  margin: 0; font-size: 15px; line-height: 1.75; color: var(--ink-muted);
}

/* 12. Page list (Notion 식 링크 리스트) ---------------------------------- */
.page-list {
  border-top: 1px solid var(--line);
}
.page-list li { border-bottom: 1px solid var(--line); }
.page-list a {
  display: grid;
  grid-template-columns: 20px 1fr auto 18px;
  gap: 14px; align-items: baseline;
  padding: 18px 8px;
  transition: background 0.15s var(--ease);
}
.page-list a:hover { background: var(--paper-warm); }
.pl-icon {
  font-family: var(--font-serif); font-size: 16px;
  color: var(--accent); text-align: center;
}
.pl-title {
  font-family: var(--font-serif); font-size: 18px; font-weight: 700;
  letter-spacing: -0.02em;
}
.pl-desc {
  font-size: 13px; color: var(--ink-muted);
  justify-self: end; text-align: right;
  max-width: 360px;
}
.pl-arrow {
  font-family: var(--font-mono); font-size: 16px; color: var(--ink-soft);
  transition: transform 0.2s var(--ease), color 0.15s var(--ease);
}
.page-list a:hover .pl-arrow { color: var(--accent); transform: translateX(4px); }

/* 13. Course gallery ------------------------------------------------------ */
.course-group { margin-bottom: 48px; }
.group-title {
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--ink-muted);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink);
  margin-bottom: 0;
  display: flex; justify-content: space-between; align-items: baseline;
}
.group-title::after {
  content: attr(data-count);
  color: var(--ink-soft); font-size: 11px;
}

.course-gallery {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 0;
}
.course-card {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  border-right: 1px dashed var(--line);
  padding-right: 24px;
  position: relative;
}
.course-card:nth-child(2n) { border-right: 0; padding-right: 0; padding-left: 24px; }
.course-card:nth-child(2n) { border-left: 1px dashed var(--line); margin-left: -1px; }

.course-tag {
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
  display: inline-block;
}
.course-title {
  font-family: var(--font-serif); font-size: 22px; font-weight: 700;
  letter-spacing: -0.025em; line-height: 1.3;
  margin: 0 0 10px;
}
.course-summary {
  font-size: 15px; line-height: 1.75; color: var(--ink-muted);
  margin: 0 0 16px;
}
.course-formats {
  display: flex; flex-wrap: wrap; gap: 6px;
}
.course-formats span {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted);
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

/* 실전반 (운영 중 강의실) 전용 카드 */
.course-card.is-live {
  padding-left: 20px; padding-right: 24px;
  border-left: 2px solid var(--accent);
  background: linear-gradient(90deg, var(--accent-soft) 0%, transparent 55%);
}
.course-card.is-live:nth-child(2n) {
  border-left: 2px solid var(--accent);
  padding-left: 20px; padding-right: 24px; margin-left: 0;
  background: linear-gradient(90deg, var(--accent-soft) 0%, transparent 55%);
}
.live-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent-ink);
  padding: 3px 10px;
  background: #fff;
  border: 1px solid var(--accent);
  border-radius: 999px;
  margin-bottom: 12px;
}
.live-badge::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  animation: livePulse 2s infinite;
}
@keyframes livePulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.85); }
}
.course-enter {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 16px;
  font-family: var(--font-serif); font-size: 15px; font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent-ink);
  border-bottom: 1.5px solid var(--accent);
  padding-bottom: 2px;
  transition: transform 0.2s var(--ease), color 0.15s var(--ease);
}
.course-enter:hover { transform: translateX(4px); color: var(--accent); }

/* 실전반 그룹 타이틀에 운영중 배지 */
.group-title.is-live-group::after {
  content: "운영중";
  display: inline-flex; align-items: center; gap: 4px;
  color: var(--accent); font-weight: 600;
  padding: 2px 8px;
  background: var(--accent-soft);
  border-radius: 999px;
}
.group-title.is-live-group::before {
  content: "●";
  color: var(--accent); font-size: 8px;
  margin-right: 6px;
  animation: livePulse 2s infinite;
}

/* 14. Audience list (컬러 콜아웃 리스트) --------------------------------- */
.audience-list {
  display: grid; gap: 2px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.aud {
  display: grid; grid-template-columns: 180px 1fr;
  gap: 40px; align-items: baseline;
  padding: 22px 8px;
  border-top: 1px solid var(--line);
  position: relative;
}
.aud:first-child { border-top: 0; }
.aud::before {
  content: ""; position: absolute; left: 0; top: 28px; bottom: 28px;
  width: 3px; border-radius: 2px;
}
.aud.a1::before { background: var(--accent); }
.aud.a2::before { background: #c08a3a; }
.aud.a3::before { background: #8b5f84; }
.aud.a4::before { background: #5a7a46; }
.aud-tag {
  font-family: var(--font-serif); font-size: 18px; font-weight: 700;
  letter-spacing: -0.02em; padding-left: 16px;
}
.aud p {
  margin: 0; font-size: 15px; line-height: 1.8; color: var(--ink-muted);
}

/* 15. Numbered list (운영방식) ------------------------------------------- */
.numbered-list { display: grid; gap: 0; }
.numbered-list li {
  display: grid; grid-template-columns: 88px 1fr;
  gap: 32px; align-items: baseline;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}
.numbered-list li:first-child { border-top: 0; }
.n-num {
  font-family: var(--font-serif); font-size: 40px; font-weight: 700;
  color: var(--accent); letter-spacing: -0.02em; line-height: 1;
  font-style: italic;
}
.numbered-list strong {
  display: block;
  font-family: var(--font-serif); font-size: 22px; font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.numbered-list p {
  margin: 0; font-size: 15px; line-height: 1.75; color: var(--ink-muted);
  max-width: 560px;
}

/* 16. Review quotes ------------------------------------------------------- */
.review-stack { display: grid; gap: 0; }
.review-quote {
  margin: 0;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  position: relative;
  padding-left: 56px;
}
.review-quote:first-child { border-top: 0; }
.review-quote::before {
  content: "\201C";
  position: absolute; left: 0; top: 24px;
  font-family: var(--font-serif); font-size: 52px; line-height: 0.8;
  color: var(--accent); opacity: 0.55;
}
.review-quote p {
  margin: 0;
  font-family: var(--font-serif); font-size: 22px; font-weight: 500;
  line-height: 1.55; letter-spacing: -0.025em;
  color: var(--ink);
}
.review-quote mark {
  background: var(--highlight); color: var(--ink);
  padding: 0 4px; border-radius: 2px;
}
.review-quote footer {
  margin-top: 12px;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-soft);
}

/* 17. Properties panel (Notion 페이지 속성) ------------------------------ */
.properties {
  margin: 0 0 32px;
  border-top: 1px solid var(--line);
}
.properties > div {
  display: grid; grid-template-columns: 140px 1fr;
  gap: 24px;
  padding: 14px 8px;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.properties dt {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--ink-muted);
}
.properties dd {
  margin: 0; font-size: 16px; color: var(--ink);
}
.properties dd a {
  border-bottom: 1px solid var(--ink-soft);
  padding-bottom: 1px;
  transition: border-color 0.15s var(--ease), color 0.15s var(--ease);
}
.properties dd a:hover { color: var(--accent-ink); border-color: var(--accent); }

/* 18. Inline CTA --------------------------------------------------------- */
.cta-row {
  display: flex; flex-wrap: wrap; gap: 24px 32px;
  margin: 32px 0 0;
}
.cta {
  font-family: var(--font-serif); font-size: 18px; font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  border-bottom: 2px solid var(--ink);
  padding-bottom: 2px;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease), transform 0.2s var(--ease);
}
.cta:hover { color: var(--accent-ink); border-color: var(--accent); }

/* 19. Footer ------------------------------------------------------------- */
.foot {
  margin-top: 72px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 12px;
  color: var(--ink-soft);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.foot a { color: var(--ink-muted); }
.foot a:hover { color: var(--accent-ink); }

/* 20. 반응형 -------------------------------------------------------------- */
@media (max-width: 1023px) {
  .app-shell { grid-template-columns: 1fr; }
  .top-bar { display: flex; }
  .sidebar {
    position: fixed; top: 56px; left: 0; bottom: 0;
    width: min(320px, 84vw);
    height: calc(100vh - 56px);
    transform: translateX(-100%);
    transition: transform 0.3s var(--ease);
    z-index: 30;
    border-right: 1px solid var(--line);
    box-shadow: 8px 0 32px rgba(0,0,0,0);
  }
  .sidebar.is-open {
    transform: translateX(0);
    box-shadow: 8px 0 32px rgba(0,0,0,0.08);
  }
  .drawer-backdrop {
    position: fixed; inset: 56px 0 0 0; background: rgba(0,0,0,0.28);
    z-index: 25; opacity: 0; pointer-events: none;
    transition: opacity 0.2s var(--ease);
  }
  .drawer-backdrop.is-on { opacity: 1; pointer-events: auto; }

  .main-col { padding: 32px 20px 64px; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .cover { padding: 24px 0 40px; }
  .cover-sub { font-size: 16px; }
  .pull-quote { padding-left: 24px; margin: 40px 0; }
  .pull-quote blockquote { font-size: 20px; }
  .pull-quote::before { font-size: 48px; top: -16px; }
  .block { padding: 48px 0; }
  .block-head h2 { font-size: 26px; }
  .prop-grid { grid-template-columns: 1fr; }
  .prop-card { border-right: 0; border-bottom: 1px dashed var(--line); padding: 20px 0 !important; }
  .prop-card:last-child { border-bottom: 0; }
  .course-gallery { grid-template-columns: 1fr; }
  .course-card, .course-card:nth-child(2n) {
    border-right: 0; border-left: 0; padding: 24px 0; margin-left: 0;
  }
  .aud { grid-template-columns: 1fr; gap: 8px; padding-left: 14px; }
  .aud-tag { padding-left: 0; }
  .aud::before { left: 0; top: 26px; bottom: auto; height: 20px; }
  .numbered-list li { grid-template-columns: 1fr; gap: 8px; }
  .n-num { font-size: 28px; }
  .review-quote { padding-left: 36px; }
  .review-quote::before { font-size: 40px; top: 20px; }
  .review-quote p { font-size: 18px; }
  .properties > div { grid-template-columns: 1fr; gap: 4px; padding: 12px 6px; }
  .cover-meta { gap: 0 20px; }
}

/* 21. 모션 감소 선호 ---------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}

/* 22. 프린트 ------------------------------------------------------------- */
@media print {
  .sidebar, .top-bar, .drawer-backdrop { display: none; }
  .app-shell { grid-template-columns: 1fr; }
  .main-col { padding: 0; }
  a { color: inherit; text-decoration: none; }
}