/* ══════════════════════════════════════════════════
   The Neon Scholar — Vibecoding Glossary Theme
   Converted from Tailwind reference to vanilla CSS
   ══════════════════════════════════════════════════ */

/* ── Reset & Variables ── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Surface & Background */
  --color-bg: #11120f;
  --color-surface: #1d1e19;
  --color-surface-hover: #282a22;
  --color-surface-dim: #0c0d0a;
  --color-surface-high: #23241d;
  --color-surface-lowest: #000000;

  /* Text */
  --color-text: #eae7dd;
  --color-text-muted: #b9bcaf;

  /* Accent: Secondary (Purple) */
  --color-primary: #efbc70;
  --color-primary-dim: #d78b52;
  --color-primary-deep: #c97a3f;
  --color-on-primary: #11120f;

  /* Accent: Tertiary (Neon Cyan) */
  --color-tertiary: #f3d4a0;
  --color-tertiary-dim: #efbc70;

  /* Border */
  --color-border: #393a32;
  --color-outline: #a9ae9c;

  /* Category Colors */
  --color-ai: #efbc70;
  --color-prompt: #dae2fd;
  --color-tools: #f3d4a0;
  --color-practice: #fbbf24;

  /* Level Colors */
  --color-level-beginner: #f6d9a8;
  --color-level-basic: #efbc70;
  --color-level-advanced: #d78b52;
  --color-danger: #ff716c;

  /* Typography */
  --font-headline: 'Space Grotesk', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Manrope', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-label: 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-4xl: 3.5rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* 본문 축 — 네비·본문·홈이 모두 이 값을 쓴다. 축이 하나여야 정돈돼 보인다 (2026-07-26) */
  --container: 1040px;
  --gutter: 1.5rem;

  /* Transitions는 common.css에만 정의한다 (2026-07-27에 사본 제거).
     여기 사본이 있으면 나중에 로드되는 이 파일이 이겨서 common 수정이 안 먹는다. */
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 52px;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  /* 한글은 낱말 단위로 줄바꿈한다. 안 하면 “바이브코
딩”처럼 꺾인다 (2026-07-26) */
  word-break: keep-all;
  overflow-wrap: break-word;
}

::selection {
  background: var(--color-tertiary);
  color: #005b51;
}

/* ── Hero Section ── */
.hero {
  position: relative;
  text-align: center;
  padding: var(--space-3xl) var(--space-lg) var(--space-2xl);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: -10%;
  width: 60%;
  height: 80%;
  border-radius: 50%;
  background: rgba(93, 231, 211, 0.05);
  filter: blur(120px);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -10%;
  right: -5%;
  width: 50%;
  height: 70%;
  border-radius: 50%;
  background: rgba(239, 188, 112, 0.05);
  filter: blur(120px);
  pointer-events: none;
}

.hero__container {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero__title {
  font-family: var(--font-headline);
  font-size: var(--font-size-4xl);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.95;
  margin-bottom: var(--space-lg);
  color: var(--color-tertiary);
  text-shadow: 0 0 40px rgba(243, 212, 160, 0.3);
}

.hero__subtitle {
  font-family: var(--font-headline);
  font-size: var(--font-size-xl);
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: var(--space-xl);
  letter-spacing: -0.02em;
}

.hero__description {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  line-height: 1.9;
  max-width: 560px;
  margin: 0 auto;
}

/* ── Hero Stats ── */
.hero__stats {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  margin-top: var(--space-xl);
}

.hero__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero__stat-num {
  font-family: var(--font-headline);
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.hero__stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-outline);
  margin-top: var(--space-xs);
}

/* ── Jump Menu ── */
.jump-menu {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  /* 배경과 밑줄은 화면 끝까지, 링크는 본문과 같은 축에서 시작한다 (2026-07-26)
     가운데 정렬이면 아래 카드들과 시작선이 어긋나 보인다 */
  justify-content: flex-start;
  gap: var(--space-sm);
  padding-block: var(--space-sm);
  padding-inline: max(var(--gutter), calc((100% - var(--container)) / 2 + var(--gutter)));
  background: rgba(17, 18, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(57, 58, 50, 0.3);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
  scroll-padding-inline: var(--space-md);
}

.jump-menu::-webkit-scrollbar { display: none; }

.jump-menu__link {
  padding: 0.375rem 0.875rem;
  font-family: var(--font-label);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-outline);
  text-decoration: none;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
  scroll-snap-align: center;
  cursor: pointer;
}

.jump-menu__link:hover {
  color: var(--color-text);
}

/* 지금 어느 탭에 있는가 — 이 화면에서 가장 중요한 정보다. 가장 강하게 표시한다 */
.jump-menu__link--active {
  color: #04203b;
  background: var(--color-tertiary-dim);
  font-weight: 700;
}

.jump-menu__link--active:hover {
  color: #04203b;
  background: var(--color-tertiary);
}

/* 점프 메뉴는 탭이다. 고르지 않은 패널은 감춘다 (js/app.js: activateTab) */
.pane--off { display: none !important; }

/* 인쇄할 때는 탭과 무관하게 전부 나오게 한다 */
@media print {
  .pane--off { display: block !important; }
  .jump-menu { display: none !important; }
}

/* FAB 스타일은 css/common.css 한 곳에만 둔다 (2026-07-26).
   여기 사본은 툴팁(::after)과 position:relative가 빠진 옛 판이었다 */

/* ── Light Mode (glossary) ── */

html.light .hero { background: var(--color-bg); }
html.light .hero::before, html.light .hero::after { opacity: 0; }
html.light .hero__title { color: var(--color-text); text-shadow: none; }
html.light .hero__subtitle { color: var(--color-primary); }
html.light .hero__description { color: var(--color-text-muted); }

html.light .hero__stat-num { color: var(--color-primary); }
html.light .hero__stat-label { color: var(--color-outline); }

html.light .search__input { background: #fff; border-color: #d1dae5; color: #141c2f; }
html.light .search__input:focus { border-color: #7c4dff; box-shadow: 0 0 0 3px rgba(124,77,255,0.1); }
html.light .search__input::placeholder { color: #6b7a90; }
html.light .search__icon { color: #5a697f; }   /* 2.06:1 → 5.62:1. 아이콘도 3:1은 넘어야 보인다 */
html.light .search__clear { color: #5a697f; }
html.light .search__clear:hover { color: #141c2f; background: rgba(0,0,0,0.05); }

html.light .tabs__btn { background: #fff; border-color: #d1dae5; color: #334155; }
html.light .tabs__btn:hover { color: #141c2f; border-color: #6b7a90; background: #f8fafc; }
html.light .tabs__btn--active { color: #6234cc; border-color: #7c4dff; background: rgba(124,77,255,0.10); box-shadow: none; }
html.light .tabs__btn--active:hover { color: #6234cc; border-color: #7c4dff; background: rgba(124,77,255,0.16); }
html.light .tabs__count { color: #5a697f; background: rgba(0,0,0,0.05); }
html.light .tabs__btn--active .tabs__count { color: rgba(255,255,255,0.8); background: rgba(255,255,255,0.2); }

html.light .filters__btn { border-color: #d1dae5; color: #334155; }
html.light .filters__btn:hover { color: #141c2f; border-color: #6b7a90; }
html.light .filters__btn--active { color: #6234cc; border-color: #7c4dff; background: rgba(124,77,255,0.10); }

html.light .counter { color: #5a697f; }
html.light .filter-line__label { color: #5a697f; }

html.light .card { background: #fff; border-color: #d1dae5; backdrop-filter: none; }
html.light .card:hover { box-shadow: 0 4px 20px rgba(0,0,0,0.06); border-color: #6b7a90; }
html.light .card__term { color: #141c2f; }
html.light .card__term-ko { color: #5a697f; }
html.light .card__short-def { color: #334155; }
html.light .card__category-icon { opacity: 0.8; }
html.light .card__toggle { color: #56657c; }
html.light .card:hover .card__toggle { color: #7c4dff; }
html.light .card--expanded .card__toggle { color: #0f766e; }
html.light .card__detail-inner { border-color: #dee5ed; }
html.light .card__section-title { color: #0f766e; }
html.light .card__section-text { color: #334155; }
html.light .card--expanded { border-left-color: #7c4dff; }
html.light .card--expanded[data-category="ai-basic"] { border-left-color: #7c4dff; box-shadow: 0 0 20px rgba(124,77,255,0.05); }
html.light .card--expanded[data-category="prompt"] { border-left-color: #334155; box-shadow: 0 0 20px rgba(0,0,0,0.03); }
html.light .card--expanded[data-category="tools"] { border-left-color: #0f766e; box-shadow: 0 0 20px rgba(13,148,136,0.05); }
html.light .card--expanded[data-category="practice"] { border-left-color: #d97706; box-shadow: 0 0 20px rgba(217,119,6,0.05); }

html.light .card__badge--beginner { background: transparent; color: #6234cc; border-color: rgba(124, 77, 255, 0.30); }
html.light .card__badge--basic { background: rgba(124, 77, 255, 0.22); color: #4a1fa6; border-color: rgba(124, 77, 255, 0.38); }
html.light .card__badge--advanced { background: #6234cc; color: #fff; border-color: #6234cc; }

html.light .related__pill { color: #0f766e; background: rgba(13,148,136,0.06); border-color: rgba(13,148,136,0.2); }
html.light .related__pill:hover { color: #0f766e; background: rgba(13,148,136,0.12); border-color: rgba(13,148,136,0.4); }
html.light .card__section--related { border-color: #dee5ed; }

html.light .jump-menu { background: rgba(248,250,252,0.97); border-color: #d1dae5; }
html.light .jump-menu__link { color: #5a697f; }
html.light .jump-menu__link:hover { color: #141c2f; }
html.light .jump-menu__link--active { color: #fff; background: #0f766e; }
html.light .jump-menu__link--active:hover { color: #fff; background: #115e59; }

html.light .guide__heading { color: #141c2f; }
html.light .guide__intro { color: #334155; }
html.light .guide { border-color: #dee5ed; }

html.light .roadmap__item,
html.light .pc__item,
html.light .pitfall__item,
html.light .cs__item,
html.light .ed__item { background: #fff; border-color: #d1dae5; }

html.light .roadmap__item:hover,
html.light .pc__item:hover,
html.light .pitfall__item:hover,
html.light .cs__item:hover,
html.light .ed__item:hover { border-color: #6b7a90; }

html.light .roadmap__day { color: #fff; }
html.light .roadmap__title { color: #141c2f; }
html.light .roadmap__desc { color: #334155; }
html.light .roadmap__action { color: #0f766e; background: rgba(13,148,136,0.05); }
html.light .roadmap__result { color: #7c4dff; background: rgba(124,77,255,0.05); }

html.light .pc__goal { color: #141c2f; }
html.light .pc__label { color: #141c2f; }
html.light .pc__code { color: #141c2f; } /* 예시 글은 잉크색으로 — #334155는 흐려서 안 읽힌다는 지적 (2026-08-11) */
html.light .pc__why { color: #0f766e; }
html.light .pc__tags { color: #5a697f; }
html.light .pc__tag { color: #7c4dff; background: rgba(124,77,255,0.06); border-color: rgba(124,77,255,0.2); }
html.light .pc__box--bad { background: rgba(220,38,38,0.04); border-color: rgba(220,38,38,0.15); }
html.light .pc__box--good { background: rgba(5,150,105,0.04); border-color: rgba(5,150,105,0.15); }

html.light .compare-table th { background: #f8fafc; color: #334155; border-color: #d1dae5; }
html.light .compare-table td { color: #334155; border-color: #dee5ed; }
html.light .compare-table tr:hover td { background: #f9fafb; }
html.light .ct__tool { color: #141c2f !important; }
html.light .table-wrap { border-color: #d1dae5; }

html.light .pitfall__title { color: #141c2f; }
html.light .pitfall__problem { color: var(--color-danger); }
html.light .pitfall__problem strong { color: #b91c1c; }
html.light .pitfall__solution { color: #0f766e; }
html.light .pitfall__solution strong { color: #0f766e; }

html.light .cs__when { color: #5a697f; }
html.light .cs__technique { color: #141c2f; }
html.light .cs__example { color: #141c2f; } /* .pc__code와 같은 처방 — 잉크색으로 (2026-08-12) */
html.light .cs__tip { color: #334155; }

html.light .ed__code { color: var(--color-danger); background: rgba(185,28,28,0.05); }
html.light .ed__header .card__badge { color: #fff; }
html.light .ed__meaning { color: #334155; }
html.light .ed__meaning strong { color: #141c2f; }
html.light .ed__solution { color: #0f766e; }
html.light .ed__solution strong { color: #0f766e; }

html.light .empty__text { color: #141c2f; }
html.light .empty__hint { color: #5a697f; }
html.light .empty__reset { color: #6234cc; border-color: #7c4dff; background: rgba(124,77,255,0.10); }
html.light .empty__reset:hover { background: rgba(124,77,255,0.18); }

html.light .hero__subtitle { color: #7c4dff; }
html.light .hero__stat-num { color: #7c4dff; }
html.light .hero__stat-label { color: #5a697f; }

html.light ::selection { background: #7c4dff; color: #fff; }

/* ── Tab Count Badge ── */
.tabs__count {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--color-outline);
  background: rgba(234, 231, 221, 0.08);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-full);
  margin-left: 0.25rem;
}

.tabs__btn--active .tabs__count {
  color: var(--color-on-primary);
  background: rgba(255, 255, 255, 0.2);
}

/* ── Main Content ── */
.main {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-2xl) var(--gutter);
}

/* ── Search Bar ── */
.search {
  margin-bottom: var(--space-xl);
}

.search__wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search__icon {
  position: absolute;
  left: var(--space-lg);
  color: var(--color-outline);
  pointer-events: none;
  transition: color var(--transition-fast);
  /* ⚠️ z-index를 빼면 라이트 모드에서 아이콘이 사라진다 (2026-07-28).
     .search__input의 backdrop-filter가 입력창을 별도 층으로 올려,
     마크업에서 아이콘이 앞에 있어도 입력창이 위에 덮인다.
     다크는 배경이 반투명이라 흐릿하게 비쳐 티가 안 났다. */
  z-index: 1;
}

.search__input {
  flex: 1;
  min-width: 0;
  padding: 1rem 2.5rem 1rem 3.25rem;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: rgba(35, 36, 29, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search__input::placeholder {
  color: var(--color-outline);
}

.search__input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(239, 188, 112, 0.15), 0 0 20px rgba(239, 188, 112, 0.1);
}

.search__input:focus ~ .search__icon,
.search__wrapper:focus-within .search__icon {
  color: var(--color-primary);
}

/* ── Category Tabs ── */
/* ── 필터 한 줄 (라벨 + 버튼들) ──
   위쪽 점프 메뉴에도 “프롬프트 · 도구”가 있어 낱말이 겹친다.
   “분야” · “난이도” 라벨을 붙여 어느 층위의 이름인지 드러낸다 (2026-07-26) */
.filter-line {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.filter-line__label {
  flex: 0 0 auto;
  min-width: 2.75rem;
  font-family: var(--font-label);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-outline);
  padding-top: 0.5rem;
}

.filter-line .tabs,
.filter-line .filters { margin-bottom: 0; }

.tabs {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
  padding-bottom: var(--space-xs);
}

.tabs__btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.625rem 1.25rem;
  font-family: var(--font-headline);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  background: rgba(35, 36, 29, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  white-space: nowrap;
  letter-spacing: -0.01em;
  transition: all var(--transition-fast);
}

.tabs__btn:hover {
  color: var(--color-text);
  background: var(--color-surface-hover);
  border-color: var(--color-outline);
}

/* 분야·난이도는 “필터”다. 화면에서 가장 강해야 할 것은 위쪽 탭(지금 어디에 있는가)이므로
   여기는 한 단계 낮춘 윤곽선 강조로 둔다 (2026-07-26) */
.tabs__btn--active {
  color: var(--color-primary);
  background: rgba(239, 188, 112, 0.14);
  border-color: var(--color-primary);
  box-shadow: none;
}

.tabs__btn--active:hover {
  color: var(--color-primary);
  background: rgba(239, 188, 112, 0.2);
  border-color: var(--color-primary);
}

.tabs__icon {
  font-size: var(--font-size-sm);
}

/* ── Level Filters ── */
.filters {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.filters__btn {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  font-family: var(--font-label);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filters__btn:hover {
  color: var(--color-text);
  border-color: var(--color-outline);
}

/* 분야 필터와 같은 방식으로 통일 — 같은 층위인데 강조가 달라 보이면 안 된다 */
.filters__btn--active {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(239, 188, 112, 0.14);
}

.filters__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 6px currentColor;
}

.filters__dot--beginner { background: var(--color-level-beginner); box-shadow: none; }
.filters__dot--basic { background: var(--color-level-basic); box-shadow: none; }
.filters__dot--advanced { background: var(--color-level-advanced); box-shadow: none; }

/* ── Result Counter ── */
.counter {
  font-family: var(--font-label);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-outline);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* ── Card List ── */
.cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ── Term Card (Glass Card) ── */
.card {
  background: rgba(35, 36, 29, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(57, 58, 50, 0.6);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-fast);
}

.card:hover {
  border-color: var(--color-outline);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  transform: translateY(-1px);
}

.card__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg) var(--space-xl);
  cursor: pointer;
  user-select: none;
}

.card__header:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
  border-radius: var(--radius-xl);
}

.card__badge {
  flex-shrink: 0;
  padding: 0.2rem 0.625rem;
  font-family: var(--font-label);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  color: #fff;
}

/* 난이도는 순서가 있는 값이다. 서로 다른 색(신호등)이 아니라 한 색의 채움 정도로 나타낸다 */
.card__badge--beginner {
  background: transparent;
  color: #f6d9a8;
  border: 1px solid rgba(239, 188, 112, 0.35);
}
.card__badge--basic {
  background: rgba(239, 188, 112, 0.26);
  color: #efe7ff;
  border: 1px solid rgba(239, 188, 112, 0.45);
}
.card__badge--advanced {
  background: #efbc70;
  color: #1a0040;
  border: 1px solid #efbc70;
}

.card__info {
  flex: 1;
  min-width: 0;
}

.card__term {
  font-family: var(--font-headline);
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.2rem;
  color: var(--color-text);
}

.card__term-ko {
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  color: var(--color-outline);
  margin-left: var(--space-sm);
  font-weight: 400;
}

.card__short-def {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.card__category-icon {
  flex-shrink: 0;
  font-size: var(--font-size-lg);
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.card:hover .card__category-icon {
  opacity: 1;
}

.card__bookmark {
  flex-shrink: 0;
  background: none;
  border: none;
  font-size: var(--font-size-base);
  color: #8d9182;
  cursor: pointer;
  padding: 0 0.25rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
  opacity: 1;
}
.card__bookmark:hover { opacity: 0.8; transform: scale(1.2); }
.card__bookmark--active { color: #fbbf24; opacity: 1; }
.card__bookmark--active:hover { opacity: 1; }
html.light .card__bookmark { color: #5a697f; }
html.light .card__bookmark--active { color: #f59e0b; opacity: 1; }

.card__toggle {
  flex-shrink: 0;
  font-size: var(--font-size-sm);
  color: var(--color-outline);
  transition: transform var(--transition-normal), color var(--transition-fast);
}

.card:hover .card__toggle {
  color: var(--color-primary);
}

.card--expanded .card__toggle {
  transform: rotate(180deg);
  color: var(--color-tertiary);
}

/* ── Accordion Detail ── */
.card__detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.card--expanded .card__detail {
  max-height: 1000px;
}

.card__detail-inner {
  padding: 0 var(--space-xl) var(--space-xl);
  border-top: 1px solid rgba(57, 58, 50, 0.5);
  padding-top: var(--space-xl);
}

.card__section {
  margin-bottom: var(--space-lg);
}

.card__section:last-child {
  margin-bottom: 0;
}

/* 넓은 화면에서 펼친 카드는 2단 — 글줄 폭(40rem)을 지키면서 오른쪽 빈 공간을 내용으로 채운다.
   쉬운 설명이 왼쪽, 일상 비유·실제 예시가 오른쪽, 관련 용어는 아래 전체 폭 (2026-07-29) */
@media (min-width: 1024px) {
  .card__detail-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: var(--space-2xl);
    align-items: start;
  }
  .card__section:nth-child(1) { grid-column: 1; grid-row: 1 / 3; margin-bottom: 0; }
  .card__section:nth-child(2) { grid-column: 2; grid-row: 1; }
  .card__section:nth-child(3) { grid-column: 2; grid-row: 2; margin-bottom: 0; }
  .card__section--related { grid-column: 1 / -1; grid-row: 3; margin-top: var(--space-lg); }
}

.card__section-title {
  font-family: var(--font-headline);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-tertiary-dim);
  letter-spacing: -0.01em;
}

.card__section-text {
  /* 펼쳐서 읽는 본문이라 15px. 카드 한 줄 요약(.card__short-def)은 160개가 격자로 깔려 14px 그대로 둔다 (2026-09-15) */
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.85;
}

/* Category accent border on expanded card */
.card--expanded {
  border-left: 3px solid var(--color-primary);
}

.card--expanded[data-category="ai-basic"] {
  border-left-color: var(--color-ai);
  box-shadow: 0 0 30px rgba(239, 188, 112, 0.08);
}

.card--expanded[data-category="prompt"] {
  border-left-color: var(--color-prompt);
  box-shadow: 0 0 30px rgba(218, 226, 253, 0.06);
}

.card--expanded[data-category="tools"] {
  border-left-color: var(--color-tools);
  box-shadow: 0 0 30px rgba(243, 212, 160, 0.08);
}

.card--expanded[data-category="practice"] {
  border-left-color: var(--color-practice);
  box-shadow: 0 0 30px rgba(251, 191, 36, 0.08);
}

/* ── Empty State ── */
.empty {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
}

.empty__text {
  font-family: var(--font-headline);
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.empty__hint {
  font-size: var(--font-size-sm);
  color: var(--color-outline);
}

/* 필터 때문에 0개가 됐을 때 바로 풀 수 있게 (2026-07-26) */
.empty__reset {
  margin-top: var(--space-lg);
  padding: 0.5rem 1.125rem;
  font-family: var(--font-label);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(239, 188, 112, 0.14);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.empty__reset:hover { background: rgba(239, 188, 112, 0.24); }

/* 푸터 스타일은 css/common.css 한 곳에만 둔다.
   여기 있던 사본이 common.css를 덮어 다크에서 푸터 글씨가 2.23:1로 묻혔다 (2026-07-26) */

/* ── Responsive: Mobile ── */
@media (max-width: 768px) {
  .hero {
    padding: var(--space-2xl) var(--space-md) var(--space-xl);
  }

  .hero__title {
    font-size: var(--font-size-2xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-lg);
  }

  .main {
    padding: var(--space-lg) var(--space-md);
  }

  .card__header {
    padding: var(--space-md) var(--space-lg);
  }

  .card__term {
    font-size: var(--font-size-base);
  }

  .card__term-ko {
    display: block;
    margin-left: 0;
    margin-top: 0.125rem;
  }

  .card__detail-inner {
    padding: 0 var(--space-lg) var(--space-lg);
    padding-top: var(--space-md);
  }

  .tabs__btn {
    padding: 0.5rem 1rem;
  }

  .hero__stats {
    gap: var(--space-lg);
  }

  .hero__stat-num {
    font-size: var(--font-size-xl);
  }

  /* 모바일에서 점프 메뉴는 주된 이동 수단이다. 손가락으로 누를 만큼 키운다 */
  .jump-menu {
    gap: var(--space-xs);
    /* 축약형 padding은 위의 padding-inline을 덮는다. 본문과 같은 좌우 여백으로 */
    padding-block: 0.375rem;
    padding-inline: var(--gutter);
    justify-content: flex-start;
  }

  .jump-menu__link {
    font-size: 0.75rem;
    padding: 0.5rem 0.75rem;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
  }

  .jump-menu__link--active {
    font-weight: 700;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: var(--font-size-xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-base);
  }

  .card__header {
    padding: var(--space-md);
    gap: var(--space-sm);
  }

  .card__detail-inner {
    padding: 0 var(--space-md) var(--space-md);
    padding-top: var(--space-md);
  }
}

/* 게이트 스타일은 css/common.css 한 곳에만 둔다.
   여기 있던 옛 다크 게이트 사본이 common.css를 덮어 배경 얼룩과 어두운 입력창을 만들었다 (2026-07-26) */

/* ── Skip Link ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-on-primary);
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  text-decoration: none;
  z-index: 100;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
}

/* ── Search Clear Button ── */
/* ── Bookmark Filter Button ── */
.search__bookmark {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  margin-left: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  color: #8d9182;
  background: rgba(35, 36, 29, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.search__bookmark:hover { color: #fbbf24; border-color: rgba(251, 191, 36, 0.3); }
.search__bookmark--active { color: #fbbf24; background: rgba(251, 191, 36, 0.1); border-color: rgba(251, 191, 36, 0.4); }
html.light .search__bookmark { background: #fff; border-color: #d1dae5; color: #56657c; }
html.light .search__bookmark:hover { color: #f59e0b; border-color: rgba(245, 158, 11, 0.3); }
html.light .search__bookmark--active { color: #f59e0b; background: rgba(245, 158, 11, 0.06); border-color: rgba(245, 158, 11, 0.4); }

.search__clear {
  position: absolute;
  right: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  font-size: var(--font-size-sm);
  color: var(--color-outline);
  background: transparent;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.search__clear:hover {
  color: var(--color-text);
  background: rgba(234, 231, 221, 0.1);
}

/* ── Related Terms ── */
.card__section--related {
  padding-top: var(--space-md);
  border-top: 1px solid rgba(57, 58, 50, 0.3);
}

.related__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.related__pill {
  padding: 0.25rem 0.75rem;
  font-family: var(--font-label);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-tertiary-dim);
  background: rgba(239, 188, 112, 0.08);
  border: 1px solid rgba(239, 188, 112, 0.2);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.related__pill:hover {
  color: var(--color-tertiary);
  background: rgba(239, 188, 112, 0.15);
  border-color: rgba(239, 188, 112, 0.4);
  box-shadow: 0 0 10px rgba(239, 188, 112, 0.15);
}


/* ── 카테고리 라인 아이콘 (data-icon 주입) ── */
.card__category-icon {
  color: var(--color-primary);
  line-height: 0;
  display: inline-flex;
  align-items: center;
}
.card__category-icon svg { width: 1.1rem; height: 1.1rem; display: block; }

/* 섹션 제목 안 아이콘은 제목 색을 따름 (퍼플 고정 해제) */
.card__section-title .icon { color: inherit; }
.card__section-title .icon svg { width: 1.05em; height: 1.05em; }