/* ============================================================
   고급대수 「선형대수, 현대 수학의 관문」 — 전용 디자인 시스템
   Playful Minimalism · PANTONE 5색 (독립 팔레트, 레포 공용 CSS와 무관)
   ============================================================ */

:root {
  /* 확정 팔레트 */
  --bg:          #F0EAE1;  /* PANTONE 11-4201 Cloud Dancer */
  --patina:      #6E9C99;  /* PANTONE 14-4810 Patina Blue  */
  --gold:        #D6A419;  /* PANTONE 14-0951 Golden Rod   */
  --terra:       #A9552E;  /* PANTONE 18-1454 Red Earth    */
  --sage:        #A8C796;  /* PANTONE 14-0121 (확정)        */

  /* 본문 대비용 딥 톤 (WCAG AA — 밝은 배경 위 텍스트 전용) */
  --patina-deep: #3F6663;
  --gold-deep:   #7E650F;
  --terra-deep:  #8A4525;
  --sage-deep:   #55703F;

  /* 배경 틴트 */
  --patina-tint: #E1EBE9;
  --gold-tint:   #F6EBC9;
  --terra-tint:  #F2DFD3;
  --sage-tint:   #E9F0DF;

  --ink:        #33302B;
  --ink-soft:   #6B655C;
  --paper:      #FBF8F2;
  --line:       #E0D7C8;

  --radius:     22px;
  --radius-sm:  14px;
  --shadow:     0 2px 10px rgba(51, 48, 43, .07);
  --font:       "Noto Sans KR", sans-serif;
  --mono:       "JetBrains Mono", "Noto Sans KR", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.75;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 레이아웃 ---------- */
.wrap { max-width: 1000px; margin: 0 auto; padding: 24px 20px 90px; }

.top-nav {
  display: flex; align-items: center; gap: 12px;
  padding: 18px 4px 6px; font-weight: 700;
}
.top-nav a {
  color: var(--patina-deep); text-decoration: none;
  padding: 6px 14px; border-radius: 999px; background: var(--paper);
  border: 2px solid var(--line); transition: transform .12s;
}
.top-nav a:hover { transform: translateX(-3px); }
.top-nav .crumb { color: var(--ink-soft); font-size: .9rem; font-weight: 500; }

/* ---------- 히어로 ---------- */
.hero { padding: 34px 6px 10px; }
.hero .unit-chip {
  display: inline-block; font-size: .85rem; font-weight: 800; letter-spacing: .06em;
  color: #fff; background: var(--patina); padding: 5px 16px; border-radius: 999px;
  margin-bottom: 14px;
}
.hero .unit-chip.gold  { background: var(--gold); }
.hero .unit-chip.terra { background: var(--terra); }
.hero .unit-chip.sage  { background: var(--sage-deep); }
.hero h1 {
  font-size: clamp(1.7rem, 4.6vw, 2.6rem); font-weight: 900;
  line-height: 1.28; margin: 0 0 10px; letter-spacing: -.02em;
}
.hero .big-q { color: var(--terra-deep); }
.hero p.lead { font-size: 1.06rem; color: var(--ink-soft); max-width: 46em; margin: 0; }

/* ---------- 패널(섹션 카드) ---------- */
.panel {
  background: var(--paper); border: 2px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 30px clamp(18px, 4vw, 38px); margin: 26px 0;
}
.panel > h2 {
  font-size: 1.45rem; font-weight: 900; margin: 0 0 6px; letter-spacing: -.01em;
  display: flex; align-items: center; gap: 10px;
}
.panel > h2 .no {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 38px; height: 38px; border-radius: 12px; font-size: 1.05rem;
  background: var(--patina-tint); color: var(--patina-deep);
}
.panel h3 { font-size: 1.12rem; font-weight: 800; margin: 26px 0 8px; }
.panel p  { margin: 10px 0; }
.panel .sub { color: var(--ink-soft); font-size: .95rem; }

/* ---------- 버튼 (3D 눌림) ---------- */
.btn {
  --btn-bg: var(--patina); --btn-sh: #557f7c;
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font); font-size: .95rem; font-weight: 800; color: #fff;
  background: var(--btn-bg); border: none; border-radius: var(--radius-sm);
  padding: 10px 20px; cursor: pointer;
  box-shadow: 0 4px 0 var(--btn-sh);
  transition: transform .08s, box-shadow .08s, filter .12s;
  user-select: none;
}
.btn:hover  { filter: brightness(1.06); }
.btn:active, .btn.pressed { transform: translateY(4px); box-shadow: 0 0 0 var(--btn-sh); }
.btn:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }
.btn.gold  { --btn-bg: var(--gold);  --btn-sh: #a37e12; }
.btn.terra { --btn-bg: var(--terra); --btn-sh: #7d3f22; }
.btn.sage  { --btn-bg: var(--sage-deep); --btn-sh: #3e5230; }
.btn.ghost {
  --btn-bg: var(--paper); --btn-sh: var(--line);
  color: var(--ink); border: 2px solid var(--line);
}
.btn.small { padding: 6px 14px; font-size: .85rem; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ---------- 위젯 ---------- */
.widget {
  background: #fff; border: 2px solid var(--line); border-radius: var(--radius-sm);
  padding: 18px; margin: 18px 0;
}
.widget canvas {
  display: block; width: 100%; height: auto;
  border-radius: 10px; background: #FDFCF9; border: 1px solid var(--line);
  touch-action: none;
}
.controls {
  display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: center;
  margin: 12px 0 4px;
}
.controls label { font-size: .9rem; font-weight: 700; color: var(--ink-soft); }
.controls input[type="range"] { accent-color: var(--terra); min-width: 140px; }
.controls input[type="number"], .controls select {
  font-family: var(--mono); font-size: .95rem; padding: 6px 10px;
  border: 2px solid var(--line); border-radius: 10px; background: var(--paper);
  width: 84px;
}
.controls select { width: auto; }
.readout {
  font-family: var(--mono); font-size: .92rem; background: var(--patina-tint);
  color: var(--patina-deep); border-radius: 10px; padding: 6px 12px; font-weight: 700;
}
.readout.gold  { background: var(--gold-tint);  color: var(--gold-deep); }
.readout.terra { background: var(--terra-tint); color: var(--terra-deep); }
.readout.sage  { background: var(--sage-tint);  color: var(--sage-deep); }

/* 행렬 입력 그리드 */
.mat-input {
  display: inline-grid; grid-template-columns: repeat(2, 74px); gap: 8px;
  padding: 10px 16px; position: relative;
}
.mat-input input {
  font-family: var(--mono); font-size: 1.02rem; text-align: center;
  padding: 8px 4px; border: 2px solid var(--line); border-radius: 10px;
  background: var(--paper); width: 74px;
}
.mat-input::before, .mat-input::after {
  content: ""; position: absolute; top: 0; bottom: 0; width: 12px;
  border: 3px solid var(--ink);
}
.mat-input::before { left: 0; border-right: none; border-radius: 8px 0 0 8px; }
.mat-input::after  { right: 0; border-left: none; border-radius: 0 8px 8px 0; }

/* ---------- 퀴즈/판정 ---------- */
.quiz-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 10px 0; }
.choice {
  font-family: var(--font); font-weight: 700; font-size: .92rem;
  background: var(--paper); color: var(--ink); border: 2px solid var(--line);
  border-radius: 999px; padding: 8px 18px; cursor: pointer;
  transition: transform .1s;
}
.choice:hover { transform: translateY(-2px); }
.choice.correct { background: var(--sage-tint); border-color: var(--sage-deep); color: var(--sage-deep); animation: pop .35s; }
.choice.wrong   { background: var(--terra-tint); border-color: var(--terra); color: var(--terra-deep); animation: shake .3s; }
@keyframes pop   { 40% { transform: scale(1.12); } }
@keyframes shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }

.feedback { font-weight: 700; margin: 8px 0; min-height: 1.4em; }
.feedback.ok  { color: var(--sage-deep); }
.feedback.no  { color: var(--terra-deep); }

/* ---------- 선형의 창 ---------- */
.window-linear {
  border-left: 6px solid var(--sage); background: var(--sage-tint);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 18px 22px; margin: 26px 0;
}
.window-linear .wl-tag {
  font-weight: 900; color: var(--sage-deep); font-size: .95rem;
  letter-spacing: .04em; display: block; margin-bottom: 6px;
}
.window-linear ul { margin: 8px 0; padding-left: 20px; }

/* ---------- 더 깊이 보기 ---------- */
details.deeper {
  background: var(--patina-tint); border-radius: var(--radius-sm);
  padding: 0; margin: 22px 0; border: 2px solid transparent;
}
details.deeper summary {
  cursor: pointer; font-weight: 800; color: var(--patina-deep);
  padding: 14px 20px; list-style: none; user-select: none;
}
details.deeper summary::before { content: "🔭 "; }
details.deeper[open] { border-color: var(--patina); }
details.deeper .inner { padding: 0 22px 18px; }

/* ---------- 코드 카드 ---------- */
.code-card {
  position: relative; background: #2E2B26; border-radius: var(--radius-sm);
  margin: 18px 0; overflow: hidden;
}
.code-card .code-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 16px; background: #3A362F; color: #D8D2C6;
  font-size: .85rem; font-weight: 700;
}
pre.code-block {
  margin: 0; padding: 18px; overflow-x: auto;
  font-family: var(--mono); font-size: .84rem; line-height: 1.6; color: #EAE4D8;
}
pre.code-block .hl { color: var(--gold); font-weight: 700; }
.copy-btn {
  font-family: var(--font); font-size: .8rem; font-weight: 800;
  background: var(--gold); color: #3A362F; border: none; border-radius: 8px;
  padding: 5px 12px; cursor: pointer; box-shadow: 0 3px 0 #a37e12;
  transition: transform .08s, box-shadow .08s;
}
.copy-btn:active { transform: translateY(3px); box-shadow: none; }

/* ---------- 논문/탐구실 ---------- */
.lab {
  border: 3px dashed var(--gold); border-radius: var(--radius);
  background: var(--gold-tint); padding: 26px clamp(16px, 3.5vw, 32px); margin: 30px 0;
}
.lab > h2 { margin-top: 0; }
.paper {
  background: var(--paper); border: 2px solid var(--line); border-radius: var(--radius-sm);
  padding: 14px 18px; margin: 12px 0;
}
.paper .p-title { font-weight: 800; }
.paper .p-meta  { font-size: .86rem; color: var(--ink-soft); font-family: var(--mono); }
.paper .p-guide { font-size: .92rem; margin-top: 6px; }

/* ---------- 허브 카드 ---------- */
.grid-cards {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 18px; margin: 22px 0;
}
a.card {
  display: block; text-decoration: none; color: var(--ink);
  background: var(--paper); border: 2px solid var(--line);
  border-radius: var(--radius); padding: 22px;
  box-shadow: 0 5px 0 var(--line);
  transition: transform .12s, box-shadow .12s;
  position: relative;
}
a.card:hover { transform: translateY(-4px); box-shadow: 0 9px 0 var(--line); }
a.card:active { transform: translateY(2px); box-shadow: 0 2px 0 var(--line); }
a.card .icon { font-size: 2rem; }
a.card h3 { margin: 8px 0 4px; font-size: 1.08rem; font-weight: 900; }
a.card p  { margin: 0; font-size: .88rem; color: var(--ink-soft); line-height: 1.6; }
a.card .badge {
  display: inline-block; margin-top: 12px; font-size: .74rem; font-weight: 800;
  padding: 3px 12px; border-radius: 999px;
  background: var(--patina-tint); color: var(--patina-deep);
}
a.card.bridge { border-color: var(--sage); box-shadow: 0 5px 0 var(--sage); }
a.card.bridge:hover { box-shadow: 0 9px 0 var(--sage); }
a.card.bridge .badge { background: var(--sage-tint); color: var(--sage-deep); }
a.card .done {
  position: absolute; top: 14px; right: 16px; font-size: 1.2rem;
}

/* 큰 질문 표 */
.q-map { display: grid; gap: 14px; margin: 20px 0; }
.q-item {
  display: grid; grid-template-columns: 52px 1fr; gap: 14px; align-items: start;
  background: var(--paper); border: 2px solid var(--line);
  border-radius: var(--radius-sm); padding: 16px 18px;
}
.q-item .q-no {
  width: 52px; height: 52px; border-radius: 16px; display: flex;
  align-items: center; justify-content: center; font-size: 1.5rem;
}
.q-item h3 { margin: 0 0 2px; font-size: 1.05rem; }
.q-item p { margin: 0; font-size: .9rem; color: var(--ink-soft); }

/* ---------- 기타 ---------- */
.pill-note {
  display: inline-block; background: var(--terra-tint); color: var(--terra-deep);
  font-weight: 700; font-size: .88rem; border-radius: 10px; padding: 4px 12px;
}
.std-footer {
  margin-top: 40px; padding: 18px 22px; border-radius: var(--radius-sm);
  background: rgba(51,48,43,.05); font-size: .85rem; color: var(--ink-soft);
}
.std-footer b { color: var(--ink); }
.next-link { text-align: center; margin: 40px 0 0; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(80px);
  background: var(--ink); color: #fff; font-weight: 700; font-size: .9rem;
  padding: 10px 22px; border-radius: 999px; opacity: 0; transition: all .3s; z-index: 50;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 720px) {
  .two-col { grid-template-columns: 1fr; }
  body { font-size: 16px; }
}

/* 성공 폭죽(마이크로 애니메이션) */
.confetti-burst { position: relative; }
.confetti-burst::after {
  content: "🎉"; position: absolute; top: -14px; right: -10px;
  animation: confetti .8s ease-out;
}
@keyframes confetti {
  0% { transform: scale(.2) rotate(-30deg); opacity: 0; }
  40% { transform: scale(1.4) rotate(10deg); opacity: 1; }
  100% { transform: scale(1) rotate(0); opacity: 0; }
}

/* ============================================================
   2026 course redesign — Editorial Lab
   공통 HTML 구조는 유지하되 읽기 화면과 발표 화면을 하나의 체계로 묶는다.
   ============================================================ */

:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --paper: #ffffff;
  --ink: #172033;
  --ink-soft: #5d677c;
  --line: #dfe4ef;
  --line-strong: #c4ccdc;

  --patina: #147d78;
  --patina-deep: #075e5a;
  --patina-tint: #e4f4f2;
  --gold: #f0b429;
  --gold-deep: #7b5400;
  --gold-tint: #fff4cf;
  --terra: #e45d3d;
  --terra-deep: #a93620;
  --terra-tint: #fff0eb;
  --sage: #8dc7a5;
  --sage-deep: #276748;
  --sage-tint: #eaf7ef;
  --blue: #3858d6;
  --blue-deep: #233b9c;
  --blue-tint: #edf0ff;
  --night: #10182a;

  --radius: 18px;
  --radius-sm: 11px;
  --shadow: 0 16px 42px rgba(23, 32, 51, .07);
  --shadow-float: 0 22px 70px rgba(16, 24, 42, .22);
  --font: "Noto Sans KR", "Pretendard", "Apple SD Gothic Neo", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --shell-h: 64px;
}

html {
  scroll-padding-top: calc(var(--shell-h) + 22px);
}

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% -10%, rgba(56, 88, 214, .1), transparent 30rem),
    linear-gradient(rgba(56, 88, 214, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 88, 214, .025) 1px, transparent 1px),
    var(--bg);
  background-size: auto, 32px 32px, 32px 32px, auto;
  color: var(--ink);
  font-size: 16.5px;
  line-height: 1.76;
  letter-spacing: -.012em;
  text-wrap: pretty;
}

body.has-course-shell { padding-top: var(--shell-h); }
body.drawer-open { overflow: hidden; }

::selection { color: #fff; background: var(--blue); }

a { color: var(--blue-deep); text-underline-offset: .18em; }
a:hover { color: var(--terra-deep); }

:focus-visible {
  outline: 3px solid rgba(56, 88, 214, .7);
  outline-offset: 3px;
}

.wrap {
  width: min(1120px, calc(100% - 40px));
  max-width: none;
  margin-inline: auto;
  padding: 38px 0 110px;
}

.has-course-shell > .top-nav,
.has-course-shell .wrap > .top-nav { display: none; }

.hero {
  position: relative;
  padding: clamp(52px, 7vw, 88px) clamp(4px, 2vw, 24px) 34px;
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  width: min(38vw, 420px);
  aspect-ratio: 1;
  right: 0;
  top: 18px;
  border-radius: 50%;
  background:
    linear-gradient(135deg, transparent 46%, rgba(56, 88, 214, .11) 46% 48%, transparent 48%),
    repeating-radial-gradient(circle, rgba(56, 88, 214, .12) 0 2px, transparent 2px 18px);
  mask-image: linear-gradient(135deg, #000, transparent 72%);
  pointer-events: none;
}

.hero .unit-chip {
  display: inline-flex;
  align-items: center;
  min-height: 29px;
  margin: 0 0 18px;
  padding: 4px 11px;
  border: 1px solid rgba(56, 88, 214, .25);
  border-radius: 7px;
  background: var(--blue-tint);
  color: var(--blue-deep);
  font: 800 .74rem/1.2 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.hero .unit-chip.gold { color: var(--gold-deep); background: var(--gold-tint); border-color: rgba(240,180,41,.35); }
.hero .unit-chip.terra { color: var(--terra-deep); background: var(--terra-tint); border-color: rgba(228,93,61,.3); }
.hero .unit-chip.sage { color: var(--sage-deep); background: var(--sage-tint); border-color: rgba(39,103,72,.25); }

.hero h1 {
  max-width: 19ch;
  margin: 0;
  color: var(--night);
  font-size: clamp(2.35rem, 6.2vw, 5.2rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.065em;
}

.hero .big-q {
  color: var(--blue);
  background: linear-gradient(120deg, var(--blue) 0 55%, var(--patina) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p.lead {
  max-width: 59ch;
  margin-top: 24px;
  color: var(--ink-soft);
  font-size: clamp(1.03rem, 1.5vw, 1.2rem);
  line-height: 1.8;
}

.panel,
.lab {
  position: relative;
  margin: 30px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .94);
  box-shadow: var(--shadow);
}

.panel {
  padding: clamp(25px, 4.5vw, 52px);
  overflow: clip;
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(var(--blue), var(--patina));
  opacity: .7;
}

.panel > h2,
.lab > h2 {
  align-items: flex-start;
  max-width: 34ch;
  margin: 0 0 14px;
  color: var(--night);
  font-size: clamp(1.35rem, 2.8vw, 2.05rem);
  line-height: 1.35;
  letter-spacing: -.04em;
}

.panel > h2 .no {
  flex: 0 0 auto;
  min-width: 36px;
  height: 30px;
  margin-top: .16em;
  border: 1px solid rgba(56, 88, 214, .22);
  border-radius: 7px;
  background: var(--blue-tint);
  color: var(--blue-deep);
  font: 800 .82rem/1 var(--mono);
}

.panel h3 {
  color: var(--night);
  font-size: 1.12rem;
  line-height: 1.5;
  letter-spacing: -.025em;
}

.panel p { max-width: 78ch; }
.panel .sub { color: var(--ink-soft); font-size: .92rem; line-height: 1.68; }

.slide-lines {
  display: grid;
  gap: 9px;
  max-width: 72ch;
  margin: 16px 0 22px;
  padding: 0;
  list-style: none;
}
.slide-lines li {
  position: relative;
  padding-left: 22px;
  color: var(--ink);
  line-height: 1.58;
}
.slide-lines li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 10px;
  height: 2px;
  border-radius: 999px;
  background: var(--blue);
}
.slide-lines b { color: var(--night); }

.widget {
  position: relative;
  margin: 24px 0;
  padding: clamp(16px, 3vw, 26px);
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background:
    linear-gradient(rgba(56, 88, 214, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 88, 214, .025) 1px, transparent 1px),
    #fbfcff;
  background-size: 20px 20px;
  box-shadow: inset 0 1px 0 #fff;
}

.widget::before {
  content: "INTERACTIVE";
  position: absolute;
  top: -10px;
  right: 16px;
  padding: 2px 8px;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: var(--paper);
  color: var(--ink-soft);
  font: 700 .62rem/1.4 var(--mono);
  letter-spacing: .1em;
}

.widget canvas {
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(23, 32, 51, .05);
}

.controls { gap: 10px 12px; }
.controls label { color: var(--ink-soft); font-size: .85rem; }
.controls input[type="range"] { accent-color: var(--blue); }
.controls input[type="number"],
.controls select,
.mat-input input {
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: #fff;
  color: var(--night);
}

.controls input[type="number"]:focus,
.controls select:focus,
.mat-input input:focus { border-color: var(--blue); outline: 3px solid rgba(56,88,214,.12); }

.btn {
  --btn-bg: var(--blue);
  --btn-sh: var(--blue-deep);
  min-height: 42px;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 9px;
  padding: 9px 17px;
  box-shadow: 0 3px 0 var(--btn-sh), 0 8px 16px rgba(23,32,51,.1);
  font-size: .9rem;
  letter-spacing: -.01em;
}

.btn:hover { filter: brightness(1.04); transform: translateY(-1px); }
.btn:active, .btn.pressed { transform: translateY(3px); }
.btn.gold { --btn-bg: #7b5400; --btn-sh: #4d3400; }
.btn.terra { --btn-bg: #a93620; --btn-sh: #6e2112; }
.btn.sage { --btn-bg: var(--sage-deep); --btn-sh: #174b32; }
.btn.ghost {
  --btn-bg: #fff;
  --btn-sh: var(--line-strong);
  border-color: var(--line-strong);
  color: var(--ink);
  box-shadow: 0 3px 0 var(--line-strong);
}
.btn.small { min-height: 34px; padding: 5px 12px; }

.readout {
  border: 1px solid rgba(20,125,120,.18);
  border-radius: 7px;
  background: var(--patina-tint);
  color: var(--patina-deep);
  font-size: .84rem;
}
.readout.gold { border-color: rgba(240,180,41,.25); }
.readout.terra { border-color: rgba(228,93,61,.22); }
.readout.sage { border-color: rgba(39,103,72,.2); }

.choice {
  min-height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: #fff;
}
.choice:hover { border-color: var(--blue); transform: translateY(-1px); }

.window-linear {
  position: relative;
  margin: 28px 0 4px;
  border: 1px solid #bcded7;
  border-left: 4px solid var(--patina);
  border-radius: 0 13px 13px 0;
  background: linear-gradient(120deg, var(--patina-tint), #f8fcfb);
  padding: 22px clamp(18px, 3vw, 28px);
}
.window-linear .wl-tag {
  color: var(--patina-deep);
  font: 800 .78rem/1.4 var(--mono);
  letter-spacing: .045em;
}

details.deeper {
  margin: 24px 0;
  border: 1px solid #cdd5f5;
  border-radius: 13px;
  background: var(--blue-tint);
}
details.deeper summary {
  position: relative;
  padding: 16px 50px 16px 20px;
  color: var(--blue-deep);
}
details.deeper summary::before { content: "더 깊이"; margin-right: 10px; font: 700 .66rem/1 var(--mono); letter-spacing: .08em; }
details.deeper summary::after { content: "+"; position: absolute; right: 20px; font-size: 1.35rem; font-weight: 500; }
details.deeper[open] summary::after { content: "−"; }
details.deeper[open] { border-color: #99a9ec; }

.pill-note {
  border: 1px solid rgba(228,93,61,.18);
  border-radius: 6px;
  background: var(--terra-tint);
  color: var(--terra-deep);
  font: 750 .75rem/1.4 var(--mono);
}

.lab {
  padding: clamp(26px, 4.5vw, 50px);
  border: 1px solid #e2c46d;
  background: linear-gradient(145deg, #fffaf0, #fff 48%);
}
.lab::before {
  content: "INQUIRY LAB";
  display: inline-block;
  margin-bottom: 16px;
  color: var(--gold-deep);
  font: 800 .68rem/1 var(--mono);
  letter-spacing: .12em;
}
.paper {
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: 0 10px 10px 0;
  background: #fff;
  padding: 16px 19px;
  box-shadow: 0 8px 20px rgba(23,32,51,.04);
}
.paper .p-title { color: var(--night); }

.code-card {
  border: 1px solid #29334a;
  border-radius: 12px;
  background: var(--night);
  box-shadow: 0 14px 30px rgba(16,24,42,.16);
}
.code-card .code-head { background: #1b263d; }
pre.code-block { color: #e8edf8; }
.copy-btn { border-radius: 6px; box-shadow: none; }

.grid-cards {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 255px), 1fr));
  gap: 16px;
}
a.card,
.card {
  min-height: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255,255,255,.93);
  box-shadow: 0 7px 24px rgba(23,32,51,.055);
  padding: 22px;
}
a.card:hover {
  border-color: #aeb9dc;
  box-shadow: 0 18px 34px rgba(23,32,51,.1);
  transform: translateY(-4px);
}
a.card:active { box-shadow: 0 6px 16px rgba(23,32,51,.08); }
a.card.bridge { border-color: #b9d9c7; box-shadow: 0 7px 24px rgba(39,103,72,.07); }
a.card.bridge:hover { border-color: var(--sage-deep); box-shadow: 0 18px 34px rgba(39,103,72,.12); }
a.card .icon { color: var(--blue); font: 800 1rem/1 var(--mono); }
a.card h3 { color: var(--night); font-size: 1.08rem; }
a.card .badge { border-radius: 6px; font-family: var(--mono); letter-spacing: .02em; }
a.card .done {
  top: 14px;
  right: 14px;
  border-radius: 5px;
  background: var(--sage-tint);
  color: var(--sage-deep);
  padding: 2px 7px;
  font: 700 .65rem/1.6 var(--mono);
}

.q-map { gap: 10px; }
.q-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 16px 18px;
}
.q-item .q-no { border-radius: 9px; }

.section-label {
  margin: 52px 0 12px;
  color: var(--blue-deep);
  font: 800 .71rem/1 var(--mono);
  letter-spacing: .13em;
}

.std-footer {
  margin-top: 52px;
  border-top: 1px solid var(--line-strong);
  border-radius: 0;
  background: transparent;
  padding: 22px 2px;
  color: var(--ink-soft);
}

.next-link { margin-top: 48px; }

.exit-ticket {
  border-color: #b8c4eb;
  background: linear-gradient(135deg, #fff, var(--blue-tint));
}
.exit-ticket::before { background: var(--blue); opacity: 1; }
.exit-ticket .exit-kicker {
  margin: 0 0 9px;
  color: var(--blue-deep);
  font: 800 .68rem/1 var(--mono);
  letter-spacing: .11em;
}
.exit-ticket > label { display: block; margin: 18px 0 7px; color: var(--ink-soft); font-size: .82rem; font-weight: 700; }
.exit-ticket textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  padding: 13px 14px;
  font: inherit;
  line-height: 1.6;
}
.exit-ticket textarea:focus { border-color: var(--blue); outline: 3px solid rgba(56,88,214,.13); }
.exit-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 12px; }
.exit-actions [role="status"] { color: var(--patina-deep); font-size: .8rem; font-weight: 700; }

.two-col { gap: clamp(16px, 2.5vw, 28px); }

table {
  border-collapse: separate;
  border-spacing: 0;
}

/* ---------- 공통 수업 셸 ---------- */
.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 12px;
  transform: translateY(-150%);
  border-radius: 7px;
  background: var(--night);
  color: #fff;
  padding: 9px 14px;
  text-decoration: none;
}
.skip-link:focus { transform: translateY(0); }

.reading-progress {
  position: fixed;
  z-index: 210;
  inset: 0 0 auto;
  height: 3px;
  background: transparent;
}
.reading-progress span {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(90deg, var(--blue), var(--patina));
  transition: transform .08s linear;
}

.course-bar {
  position: fixed;
  z-index: 200;
  inset: 0 0 auto;
  height: var(--shell-h);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 20px;
  padding: 0 max(18px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid rgba(196,204,220,.85);
  background: rgba(255,255,255,.9);
  box-shadow: 0 8px 26px rgba(23,32,51,.045);
  backdrop-filter: blur(18px) saturate(1.2);
}

.course-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--night);
  text-decoration: none;
}
.course-brand:hover { color: var(--night); }
.course-brand-mark {
  position: relative;
  width: 34px;
  height: 34px;
  overflow: hidden;
  border-radius: 9px;
  background: var(--night);
}
.course-brand-mark::before,
.course-brand-mark::after,
.course-brand-mark i {
  content: "";
  position: absolute;
  width: 20px;
  height: 2px;
  left: 7px;
  background: #fff;
  transform-origin: left;
}
.course-brand-mark::before { top: 9px; transform: rotate(25deg); }
.course-brand-mark::after { top: 24px; transform: rotate(-25deg); }
.course-brand-mark i:first-child { top: 16px; background: #75ded7; }
.course-brand-mark i:last-child { display: none; }
.course-brand > span:last-child { display: grid; line-height: 1; }
.course-brand b { font: 900 .76rem/1 var(--mono); letter-spacing: .09em; }
.course-brand small { margin-top: 4px; color: var(--ink-soft); font-size: .67rem; }

.course-location {
  overflow: hidden;
  color: var(--ink-soft);
  font: 650 .78rem/1.3 var(--mono);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-actions { display: flex; align-items: center; gap: 6px; }
.shell-link,
.shell-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--ink-soft);
  padding: 6px 10px;
  font: 700 .76rem/1 var(--font);
  text-decoration: none;
  cursor: pointer;
}
.shell-link:hover,
.shell-button:hover { border-color: var(--line); background: var(--bg); color: var(--night); }
.shell-button span { font: 700 .95rem/1 var(--mono); }
.shell-button em { font-style: normal; }

.course-drawer-backdrop {
  position: fixed;
  z-index: 240;
  inset: 0;
  opacity: 0;
  background: rgba(16,24,42,.42);
  backdrop-filter: blur(4px);
  transition: opacity .18s;
}
.course-drawer-backdrop.is-open { opacity: 1; }

.course-drawer {
  position: fixed;
  z-index: 250;
  inset: 0 0 0 auto;
  width: min(480px, 94vw);
  overflow-y: auto;
  transform: translateX(102%);
  border-left: 1px solid var(--line);
  background: #f9fafe;
  box-shadow: var(--shadow-float);
  padding: 28px clamp(20px, 4vw, 34px) 40px;
  transition: transform .24s cubic-bezier(.22,.75,.25,1);
  visibility: hidden;
  pointer-events: none;
}
.course-drawer.is-open { transform: translateX(0); visibility: visible; pointer-events: auto; }
.drawer-head { display: flex; align-items: start; justify-content: space-between; gap: 20px; }
.drawer-head small,
.drawer-label { margin: 0; color: var(--blue-deep); font: 800 .66rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.drawer-head h2 { margin: 7px 0 0; color: var(--night); font-size: 1.55rem; letter-spacing: -.04em; }
.drawer-head button {
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
  color: var(--ink-soft);
  font-size: 1.5rem;
  cursor: pointer;
}
.today-question {
  margin: 24px 0;
  border-radius: 12px;
  background: var(--night);
  color: #fff;
  padding: 19px 20px;
}
.today-question span { color: #75ded7; font: 800 .65rem/1 var(--mono); letter-spacing: .1em; }
.today-question p { margin: 8px 0; font-size: 1.04rem; font-weight: 750; line-height: 1.55; }
.today-question small { color: #aeb8cb; }
.drawer-block { margin-top: 28px; }
.drawer-label-row { display: flex; justify-content: space-between; align-items: center; }
.drawer-label-row span { color: var(--ink-soft); font-size: .72rem; }
.course-progress-track { height: 5px; margin: 10px 0 14px; overflow: hidden; border-radius: 999px; background: var(--line); }
.course-progress-track span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--blue), var(--patina)); }
.course-routes { display: grid; gap: 7px; }
.course-route {
  display: grid;
  grid-template-columns: 35px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 10px;
  min-height: 58px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  padding: 8px 10px;
  text-decoration: none;
}
.course-route:hover { border-color: #acb8dd; color: var(--ink); transform: translateX(-2px); }
.course-route.is-current { border-color: var(--blue); background: var(--blue-tint); }
.course-route-code { color: var(--blue-deep); font: 800 .7rem/1 var(--mono); text-align: center; }
.course-route-copy { display: grid; min-width: 0; }
.course-route-copy b { font-size: .83rem; }
.course-route-copy small { overflow: hidden; color: var(--ink-soft); font-size: .68rem; text-overflow: ellipsis; white-space: nowrap; }
.course-route-state { color: var(--sage-deep); font-weight: 900; }
.course-routes.compact { grid-template-columns: 1fr 1fr; }
.course-routes.compact .course-route { grid-template-columns: 30px minmax(0,1fr) 15px; min-height: 48px; }
.course-routes.compact .course-route-copy small { display: none; }
.page-outline { display: grid; gap: 2px; margin-top: 10px; }
.page-outline a { display: grid; grid-template-columns: 26px 1fr; gap: 8px; border-radius: 7px; color: var(--ink-soft); padding: 7px 8px; font-size: .78rem; text-decoration: none; }
.page-outline a:hover { background: #fff; color: var(--blue-deep); }
.page-outline span { color: #8b96aa; font: 700 .68rem/1.8 var(--mono); }
.drawer-foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; margin-top: 30px; border-top: 1px solid var(--line); padding-top: 18px; }
.drawer-foot a,
.drawer-foot button { border: 0; background: none; color: var(--blue-deep); padding: 0; font: 700 .76rem/1.5 var(--font); cursor: pointer; }

/* ---------- 발표 모드 ---------- */
.deck-controls {
  position: fixed;
  z-index: 500;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 7px;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 12px;
  background: rgba(16,24,42,.94);
  box-shadow: 0 18px 55px rgba(0,0,0,.35);
  color: #fff;
  padding: 7px;
  backdrop-filter: blur(14px);
}
.deck-controls[hidden] { display: none; }
.deck-controls button {
  min-width: 38px;
  min-height: 36px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 8px;
  background: rgba(255,255,255,.08);
  color: #fff;
  padding: 6px 11px;
  font: 750 .78rem/1 var(--font);
  cursor: pointer;
}
.deck-controls button:hover { background: rgba(255,255,255,.16); }
.deck-controls button:disabled { opacity: .3; cursor: default; }
.deck-count { min-width: 68px; text-align: center; font: 700 .75rem/1 var(--mono); }
.deck-exit { margin-left: 5px; }
.deck-exit kbd { margin-left: 5px; color: #aeb8cb; font: 600 .65rem/1 var(--mono); }

body.deck-mode {
  overflow: hidden;
  padding-top: 0;
  background: var(--night);
  font-size: clamp(18px, 1.18vw, 23px);
  line-height: 1.6;
}
.deck-mode .course-bar,
.deck-mode .reading-progress,
.deck-mode > .top-nav { display: none; }
.deck-mode .wrap {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  width: 100%;
  height: 100dvh;
  overflow: hidden;
  padding: clamp(18px, 3vw, 42px) clamp(18px, 4vw, 64px) 78px;
}
.deck-mode .deck-slide { display: none !important; }
.deck-mode .deck-slide.is-active {
  display: block !important;
  width: min(1580px, 100%);
  max-height: calc(100dvh - 120px);
  margin: 0;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  animation: deck-in .28s ease-out;
}
.deck-mode .hero.deck-slide.is-active,
.deck-mode .panel.deck-slide.is-active,
.deck-mode .lab.deck-slide.is-active,
.deck-mode details.deck-slide.is-active {
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 28px 90px rgba(0,0,0,.35);
  padding: clamp(28px, 4vw, 58px);
}
.deck-mode .hero h1 { font-size: clamp(2.5rem, 6.3vw, 5.5rem); }
.deck-mode .panel > h2,
.deck-mode .lab > h2 { font-size: clamp(2rem, 3.4vw, 3.3rem); max-width: 30ch; }
.deck-mode .panel > p,
.deck-mode .lab > p { max-width: 64ch; font-size: 1.02em; }
.deck-mode .slide-lines { max-width: 62ch; gap: 12px; font-size: 1.08em; }
.deck-mode .panel .sub,
.deck-mode .lab .sub { font-size: .78em; }
.deck-mode .widget { padding: clamp(16px, 2vw, 28px); }
.deck-mode .widget canvas { max-height: min(49vh, 520px) !important; }
.deck-mode .btn,
.deck-mode .choice { min-height: 50px; padding: 10px 20px; font-size: .88em; }
.deck-mode .controls label,
.deck-mode .readout { font-size: .78em; }
.deck-mode .deck-reveal:not(.is-revealed) { display: none !important; }
.deck-mode .deck-reveal.is-revealed { animation: reveal-in .24s ease-out; }
.deck-mode .std-footer { display: none; }
@keyframes deck-in { from { opacity: 0; transform: translateY(12px) scale(.992); } }
@keyframes reveal-in { from { opacity: 0; transform: translateY(8px); } }

.deck-reveal-button { min-width: 92px !important; background: rgba(117,222,215,.15) !important; border-color: rgba(117,222,215,.35) !important; }

/* ---------- 새 허브/커리큘럼 컴포넌트 ---------- */
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.hero-actions a { text-decoration: none; }
.course-thesis {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, .8fr);
  gap: clamp(22px, 5vw, 58px);
  align-items: center;
  overflow: hidden;
  border-radius: 20px;
  background: var(--night);
  color: #fff;
  padding: clamp(28px, 5vw, 58px);
  box-shadow: 0 24px 64px rgba(16,24,42,.2);
}
.course-thesis .eyebrow { color: #75ded7; font: 800 .69rem/1 var(--mono); letter-spacing: .12em; }
.course-thesis h2 { margin: 12px 0; color: #fff; font-size: clamp(1.7rem, 3.5vw, 2.8rem); line-height: 1.3; letter-spacing: -.045em; }
.course-thesis p { color: #bfc8d9; }
.thesis-diagram { min-height: 260px; }
.thesis-diagram svg { display: block; width: 100%; height: auto; }

.lens-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 22px; }
.lens-card { position: relative; min-height: 210px; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #fff; padding: 22px; }
.lens-card::after { content: attr(data-code); position: absolute; right: 14px; bottom: -18px; color: rgba(56,88,214,.08); font: 900 4.8rem/1 var(--mono); }
.lens-card small { color: var(--blue-deep); font: 800 .67rem/1 var(--mono); letter-spacing: .09em; }
.lens-card h3 { margin: 13px 0 8px; font-size: 1.2rem; }
.lens-card p { position: relative; z-index: 1; color: var(--ink-soft); font-size: .88rem; }

.route-section { margin: 64px 0; }
.route-section > header { display: grid; grid-template-columns: minmax(0,1fr) minmax(240px,.55fr); gap: 30px; align-items: end; margin-bottom: 22px; }
.route-section .eyebrow { color: var(--blue-deep); font: 800 .68rem/1 var(--mono); letter-spacing: .12em; }
.route-section h2 { margin: 10px 0 0; color: var(--night); font-size: clamp(1.65rem, 3.5vw, 2.7rem); line-height: 1.25; letter-spacing: -.045em; }
.route-section > header p { margin: 0; color: var(--ink-soft); }

.learning-route { display: grid; gap: 13px; }
.route-card {
  display: grid;
  grid-template-columns: 58px minmax(180px,.65fr) minmax(240px,1.35fr) auto;
  gap: 18px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  padding: 18px 20px;
  color: var(--ink);
  text-decoration: none;
  transition: transform .15s, border-color .15s, box-shadow .15s;
}
.route-card:hover { border-color: #aab7e1; color: var(--ink); transform: translateX(4px); box-shadow: var(--shadow); }
.route-index { color: var(--blue); font: 900 1.1rem/1 var(--mono); }
.route-copy small { color: var(--ink-soft); font: 650 .68rem/1 var(--mono); }
.route-copy h3 { margin: 5px 0 0; color: var(--night); font-size: 1.16rem; }
.route-concepts { color: var(--ink-soft); font-size: .83rem; }
.route-concepts b { display: block; color: var(--patina-deep); font: 750 .7rem/1.5 var(--mono); }
.route-enter { color: var(--blue); font: 900 1.2rem/1 var(--mono); }

.progress-card { display: grid; grid-template-columns: auto 1fr auto; gap: 16px; align-items: center; border: 1px solid var(--line); border-radius: 14px; background: #fff; padding: 20px; }
.progress-orbit { --progress: 0%; width: 64px; height: 64px; border-radius: 50%; background: conic-gradient(var(--blue) var(--progress), var(--line) 0); padding: 7px; }
.progress-orbit::after { content: ""; display: block; width: 100%; height: 100%; border-radius: inherit; background: #fff; }
.progress-card p { margin: 0; color: var(--ink-soft); }
.progress-card strong { color: var(--night); font: 900 1.1rem/1 var(--mono); }

.curriculum-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 20px; align-items: start; }
.concept-map { border: 1px solid var(--line); border-radius: 16px; background: #fff; padding: clamp(18px,3vw,30px); overflow-x: auto; }
.concept-map svg { min-width: 700px; width: 100%; height: auto; }
.concept-map .node { cursor: pointer; }
.concept-map .node rect { fill: #fff; stroke: #cbd3e4; stroke-width: 1.5; rx: 8; }
.concept-map .node:hover rect { stroke: var(--blue); stroke-width: 2.2; }
.concept-map .node text { fill: var(--ink); font: 700 12px var(--font); }
.concept-map .edge { fill: none; stroke: #acb7d0; stroke-width: 1.5; marker-end: url(#arrowhead); }
.concept-map .edge.hub { stroke: var(--patina); stroke-dasharray: 5 5; }
.ontology-note { border: 1px solid #bcded7; border-radius: 13px; background: var(--patina-tint); padding: 20px; color: var(--patina-deep); font-size: .86rem; }
.ontology-note code { font-family: var(--mono); }

.lesson-list { display: grid; gap: 10px; }
.lesson-row { display: grid; grid-template-columns: 78px 1.15fr 1fr 1fr; gap: 14px; align-items: start; border: 1px solid var(--line); border-radius: 12px; background: #fff; padding: 16px; }
.lesson-no { color: var(--blue-deep); font: 800 .74rem/1.5 var(--mono); }
.lesson-row h3 { margin: 0 0 4px; font-size: .98rem; }
.lesson-row p { margin: 0; color: var(--ink-soft); font-size: .8rem; line-height: 1.55; }
.lesson-row .exit { border-left: 2px solid var(--gold); padding-left: 12px; }
.lesson-row .ontology-id { color: var(--patina-deep); font: 650 .65rem/1.45 var(--mono); }

.rubric { width: 100%; overflow: hidden; border: 1px solid var(--line); border-radius: 13px; background: #fff; }
.rubric table { width: 100%; }
.rubric th,
.rubric td { border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 13px; vertical-align: top; text-align: left; font-size: .79rem; line-height: 1.5; }
.rubric th { background: var(--blue-tint); color: var(--blue-deep); }
.rubric tr:last-child td { border-bottom: 0; }

.reveal-item { opacity: 0; transform: translateY(14px); transition: opacity .45s ease, transform .45s ease; }
.reveal-item.is-visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
  .lens-grid { grid-template-columns: 1fr; }
  .route-section > header { grid-template-columns: 1fr; gap: 12px; }
  .route-card { grid-template-columns: 44px 1fr auto; }
  .route-concepts { grid-column: 2 / -1; }
  .curriculum-grid { grid-template-columns: 1fr; }
  .lesson-row { grid-template-columns: 60px 1fr 1fr; }
  .lesson-row .exit { grid-column: 2 / -1; }
}

@media (max-width: 720px) {
  :root { --shell-h: 58px; }
  body { font-size: 15.5px; }
  .wrap { width: min(100% - 26px, 1120px); padding-top: 20px; }
  .course-bar { gap: 10px; padding-inline: 12px; }
  .course-location,
  .shell-link,
  .shell-button em { display: none; }
  .course-actions { margin-left: auto; }
  .shell-button { width: 38px; justify-content: center; padding: 6px; }
  .hero { padding-top: 42px; }
  .hero h1 { font-size: clamp(2.25rem, 12vw, 3.45rem); }
  .panel { padding: 25px 19px; }
  .panel::before { width: 3px; }
  .widget { margin-inline: -4px; padding: 15px 11px; }
  .two-col { grid-template-columns: 1fr; }
  .course-thesis { grid-template-columns: 1fr; }
  .thesis-diagram { min-height: 0; }
  .route-card { grid-template-columns: 34px 1fr auto; gap: 10px; padding: 15px 13px; }
  .route-concepts { font-size: .76rem; }
  .progress-card { grid-template-columns: auto 1fr; }
  .progress-card > strong { grid-column: 2; }
  .course-routes.compact { grid-template-columns: 1fr; }
  .deck-mode .wrap { padding: 12px 10px 72px; }
  .deck-mode .hero.deck-slide.is-active,
  .deck-mode .panel.deck-slide.is-active,
  .deck-mode .lab.deck-slide.is-active,
  .deck-mode details.deck-slide.is-active { padding: 25px 18px; border-radius: 13px; }
  .deck-exit kbd { display: none; }
  .lesson-row { grid-template-columns: 1fr; }
  .lesson-row .exit { grid-column: auto; }
  .rubric { overflow-x: auto; }
  .rubric table { min-width: 760px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .reveal-item { opacity: 1; transform: none; }
}

@media print {
  :root { --bg: #fff; }
  body { padding: 0 !important; background: #fff; color: #000; font-size: 11pt; }
  .course-bar,
  .reading-progress,
  .course-drawer,
  .course-drawer-backdrop,
  .deck-controls,
  .hero-actions,
  .copy-btn,
  .next-link { display: none !important; }
  .wrap { width: 100%; padding: 0; }
  .hero { padding: 18mm 0 8mm; }
  .hero::before,
  .panel::before { display: none; }
  .panel,
  .lab,
  .widget,
  .card { break-inside: avoid; border-color: #bbb !important; box-shadow: none !important; background: #fff !important; }
  .panel { padding: 8mm; }
  details.deeper .inner { display: block; }
  a { color: #000; text-decoration: none; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 8pt; word-break: break-all; }
}