/* ==========================================================================
   book.crowdy.dev — 컴포넌트 스타일
   규칙: 색·라운드·간격을 하드코딩하지 않는다. tokens.css 의 var() 만 참조한다.
   유틸리티 클래스를 남발하지 않고 시맨틱 컴포넌트 클래스로 정리한다.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 기반
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  min-height: 100vh;
  background: hsl(var(--background));
  color: hsl(var(--foreground));
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* 일본어 줄바꿈.
     word-break: keep-all 을 쓰지 말 것 — 그건 어절에 공백이 있는 한국어용 규칙이고,
     공백이 없는 일본어에서는 문장 전체가 끊을 수 없는 한 덩어리가 되어 가로로 넘친다(실측 확인).
     기본값(normal)이 정상 줄바꿈이며, 여기에 금칙 처리와 긴 라틴 토큰 예외만 더한다. */
  line-break: strict;
  overflow-wrap: anywhere;
}

/* 배경 분위기: 상단에 아주 옅은 광원 두 개. 토큰 색만 사용한다. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(60rem 30rem at 12% -8%, hsl(var(--secondary) / 0.55), transparent 60%),
    radial-gradient(48rem 26rem at 92% -12%, hsl(var(--muted) / 0.40), transparent 62%);
}
body > * { position: relative; z-index: 1; }

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; color: inherit; }

:where(a, button, input, [tabindex]):focus-visible {
  outline: 2px solid hsl(var(--ring));
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

::selection { background: hsl(var(--primary) / 0.9); color: hsl(var(--primary-foreground)); }

[x-cloak] { display: none !important; }

/* --------------------------------------------------------------------------
   2. 레이아웃 프리미티브
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-6));
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: calc(var(--space-4) * -4);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
  border-radius: var(--radius-sm);
  font-size: var(--step--1);
  font-weight: 600;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: var(--space-4); }

/* 괘선 — 인쇄 서지 목록의 구분선 */
.rule {
  height: 1px;
  background: hsl(var(--border));
  border: 0;
}

/* --------------------------------------------------------------------------
   3. 헤더
   -------------------------------------------------------------------------- */
/* 주입 전 자리 예약: 헤더가 늦게 떠도 본문이 위로 튀지 않는다 */
.header-slot { min-height: var(--header-height); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  background: hsl(var(--background) / 0.82);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid hsl(var(--border));
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-3), 3vw, var(--space-6));
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--step-0);
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.brand-mark {
  font-size: 0.8em;
  color: hsl(var(--muted-foreground));
  transition: color var(--dur-base) var(--ease-out);
}
.brand:hover .brand-mark { color: hsl(var(--foreground)); }
.brand-dim { color: hsl(var(--muted-foreground)); }

.site-nav {
  display: none;
  gap: var(--space-5);
  font-size: var(--step--1);
  letter-spacing: 0.01em;
}
.site-nav a {
  color: hsl(var(--muted-foreground));
  padding-block: var(--space-2);
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.site-nav a:hover { color: hsl(var(--foreground)); border-bottom-color: hsl(var(--border)); }
.site-nav a[aria-current="page"] { color: hsl(var(--foreground)); border-bottom-color: hsl(var(--foreground)); }
@media (min-width: 48rem) { .site-nav { display: flex; } }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

/* --------------------------------------------------------------------------
   4. 폼 요소
   -------------------------------------------------------------------------- */
.search { position: relative; display: flex; align-items: center; }
.search-icon {
  position: absolute;
  left: var(--space-3);
  width: 1rem; height: 1rem;
  color: hsl(var(--muted-foreground));
  pointer-events: none;
}

.input {
  width: clamp(8rem, 24vw, 15rem);
  padding: var(--space-2) var(--space-3) var(--space-2) calc(var(--space-3) * 2 + 1rem);
  background: hsl(var(--input) / 0.45);
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  font-size: var(--step--1);
  transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.input::placeholder { color: hsl(var(--muted-foreground)); }
.input:hover { border-color: hsl(var(--muted-foreground) / 0.5); }
.input:focus { background: hsl(var(--input) / 0.7); }
.input[type="search"]::-webkit-search-cancel-button { filter: invert(0.6); }

.select {
  padding: var(--space-2) var(--space-3);
  background: hsl(var(--input) / 0.45);
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  font-size: var(--step--1);
  color: hsl(var(--foreground));
}
.select option { background: hsl(var(--popover)); color: hsl(var(--popover-foreground)); }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  background: transparent;
  font-size: var(--step--1);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.button:hover { background: hsl(var(--accent)); border-color: hsl(var(--muted-foreground) / 0.45); }
.button--primary {
  background: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
  border-color: hsl(var(--primary));
}
.button--primary:hover { background: hsl(var(--primary) / 0.9); }

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem; height: 2.25rem;
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  color: hsl(var(--muted-foreground));
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.icon-button:hover { color: hsl(var(--foreground)); background: hsl(var(--accent)); }
.icon-button svg { width: 1.05rem; height: 1.05rem; }

/* --------------------------------------------------------------------------
   5. 칩 / 배지
   -------------------------------------------------------------------------- */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border: 1px solid hsl(var(--border));
  border-radius: 999px;
  font-size: var(--step--1);
  color: hsl(var(--muted-foreground));
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.chip:hover { color: hsl(var(--foreground)); border-color: hsl(var(--muted-foreground) / 0.5); }
.chip[aria-current="page"], .chip--active {
  background: hsl(var(--accent));
  color: hsl(var(--accent-foreground));
  border-color: transparent;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0 var(--space-2);
  border-radius: var(--radius-sm);
  background: hsl(var(--secondary));
  color: hsl(var(--secondary-foreground));
  font-size: var(--step--1);
  line-height: 1.7;
  letter-spacing: 0.01em;
}

/* --------------------------------------------------------------------------
   6. 히어로
   -------------------------------------------------------------------------- */
.hero {
  padding-block: clamp(var(--space-6), 8vw, var(--space-8)) var(--space-6);
  border-bottom: 1px solid hsl(var(--border));
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: hsl(var(--muted-foreground));
}
.hero-title {
  margin-top: var(--space-3);
  max-width: 22ch;
  font-family: var(--font-serif);
  font-size: var(--step-3);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.02em;
  text-wrap: balance;   /* 마지막 줄에 한 단어만 남는 것을 막는다 */
}
.hero-lede {
  margin-top: var(--space-4);
  max-width: 52ch;
  color: hsl(var(--muted-foreground));
}
.hero-stats {
  margin-top: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  font-variant-numeric: tabular-nums;
}
.hero-stat-value {
  display: block;
  font-family: var(--font-serif);
  font-size: var(--step-2);
  line-height: 1.1;
}
.hero-stat-label {
  font-size: var(--step--1);
  color: hsl(var(--muted-foreground));
  letter-spacing: 0.02em;
}

/* --------------------------------------------------------------------------
   7. 섹션 바 (제목 + 정렬)
   -------------------------------------------------------------------------- */
.section-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  padding-block: var(--space-5) var(--space-4);
}
.section-title {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  font-weight: 400;
  letter-spacing: -0.01em;
}
.section-bar .sort { margin-left: auto; display: flex; align-items: center; gap: var(--space-2); }
.sort-label { font-size: var(--step--1); color: hsl(var(--muted-foreground)); }

/* --------------------------------------------------------------------------
   8. 카드 그리드
   3열(>=1024px) / 2열(>=640px) / 1열
   -------------------------------------------------------------------------- */
.grid-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(var(--space-4), 2.5vw, var(--space-6));
  padding-bottom: var(--space-7);
}
@media (min-width: 40rem)  { .grid-cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 64rem)  { .grid-cards { grid-template-columns: repeat(3, 1fr); } }

/* 1열 구간에서는 표지를 세로로 세우면 카드 하나가 한 화면을 먹는다.
   가로 조판으로 바꿔 목록을 훑을 수 있게 한다 — 서가는 훑는 화면이다. */
@media (max-width: 39.999rem) {
  .grid-cards > .card {
    display: grid;
    grid-template-columns: 6.75rem 1fr;
    grid-template-rows: auto 1fr;
    column-gap: var(--space-4);
    row-gap: var(--space-2);
    align-items: start;
  }
  .grid-cards > .card > .cover { grid-row: 1 / 3; align-self: start; }
  .grid-cards > .card > .card-body,
  .grid-cards > .card > .card-foot { grid-column: 2; }
  .grid-cards > .card > .card-foot { align-self: end; }
  .cover-overlay { display: none; }   /* 터치 기기에는 hover 가 없다 */
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-3);
  background: hsl(var(--card));
  color: hsl(var(--card-foreground));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius-lg);
  transition: border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out);
}
.card:hover {
  border-color: hsl(var(--muted-foreground) / 0.45);
  background: hsl(var(--accent) / 0.35);
  transform: translateY(-2px);
}
.card:focus-within { border-color: hsl(var(--ring)); }

/* 카드 전체를 링크로 만들되 내부 칩과 중첩 링크가 되지 않도록 오버레이로 처리 */
.card-link::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
}
.card-link:focus-visible { outline: none; }

.cover {
  position: relative;
  /* 実表紙は 1600x2560 = 5:8。2/3(0.667)にすると object-fit:cover が上下を切り落とす。
     KDP の推奨比も 1.6:1 なので 5/8 が正しい(2026-08-03 実測)。 */
  aspect-ratio: 5 / 8;
  overflow: hidden;
  border-radius: var(--radius);
  background: hsl(var(--secondary));
}
.cover img { width: 100%; height: 100%; object-fit: cover; }

/* M1: 표지 파일이 아직 없다. 자리와 비율만 확정하는 플레이스홀더. */
.cover-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background:
    linear-gradient(160deg, hsl(var(--secondary)) 0%, hsl(var(--background)) 100%);
}
/* 책등 — 표지 왼쪽의 세로 띠 */
.cover-placeholder::before {
  content: "";
  position: absolute;
  inset-block: 0;
  left: 0;
  width: 0.5rem;
  background: linear-gradient(90deg, hsl(var(--background) / 0.85), hsl(var(--background) / 0.25));
  border-right: 1px solid hsl(var(--border));
}
.cover-initial {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 7vw, 3rem);
  color: hsl(var(--muted-foreground) / 0.55);
  letter-spacing: -0.03em;
}

.cover-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: hsl(var(--background) / 0.62);
  color: hsl(var(--foreground));
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
}
.card:hover .cover-overlay,
.card:focus-within .cover-overlay { opacity: 1; }

.card-body { display: flex; flex-direction: column; gap: var(--space-2); flex: 1; }

.card-title {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.01em;
  text-wrap: balance;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--step--1);
  color: hsl(var(--muted-foreground));
  font-variant-numeric: tabular-nums;
}
.card-meta .sep { opacity: 0.45; }

.card-foot {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid hsl(var(--border));
  font-size: var(--step--1);
  color: hsl(var(--muted-foreground));
  font-variant-numeric: tabular-nums;
}
.card-foot time { margin-left: auto; }

/* 별점 — 비인터랙티브 표시용 */
.rating { display: inline-flex; align-items: center; gap: 1px; }
.rating svg { width: 0.85rem; height: 0.85rem; }
.rating .star-on  { color: hsl(var(--foreground)); }
.rating .star-off { color: hsl(var(--muted-foreground) / 0.35); }

/* --------------------------------------------------------------------------
   9. 스켈레톤 / 에러 / 빈 상태
   -------------------------------------------------------------------------- */
.skeleton {
  border-radius: var(--radius);
  background: linear-gradient(
    90deg,
    hsl(var(--muted) / 0.5) 25%,
    hsl(var(--muted) / 0.8) 37%,
    hsl(var(--muted) / 0.5) 63%
  );
  background-size: 400% 100%;
  animation: shimmer 1.4s ease-in-out infinite;
}
@keyframes shimmer { from { background-position: 100% 0; } to { background-position: 0 0; } }

.state {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-5);
  border: 1px dashed hsl(var(--border));
  border-radius: var(--radius-lg);
  color: hsl(var(--muted-foreground));
  font-size: var(--step--1);
}
.state--error { border-color: hsl(var(--destructive)); }

/* --------------------------------------------------------------------------
   10. 푸터
   -------------------------------------------------------------------------- */
.footer-slot { min-height: 6rem; }

.site-footer {
  margin-top: var(--space-7);
  padding-block: var(--space-6);
  border-top: 1px solid hsl(var(--border));
  font-size: var(--step--1);
  color: hsl(var(--muted-foreground));
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-3) var(--space-5);
}
.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-4); margin-left: auto; }
.site-footer a { border-bottom: 1px solid transparent; transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out); }
.site-footer a:hover { color: hsl(var(--foreground)); border-bottom-color: hsl(var(--border)); }
.footer-year { font-variant-numeric: tabular-nums; }

/* --------------------------------------------------------------------------
   11. 본문 (about 등)
   -------------------------------------------------------------------------- */
.prose { max-width: 62ch; }
.prose > * + * { margin-top: var(--space-4); }
.prose h2 {
  margin-top: var(--space-6);
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 400;
  letter-spacing: -0.015em;
}
.prose p { color: hsl(var(--muted-foreground)); }
.prose strong { color: hsl(var(--foreground)); font-weight: 600; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.1em 0.35em;
  background: hsl(var(--muted) / 0.6);
  border-radius: var(--radius-sm);
}
.prose a { color: hsl(var(--foreground)); border-bottom: 1px solid hsl(var(--muted-foreground) / 0.5); }
.prose a:hover { border-bottom-color: hsl(var(--foreground)); }

.page-head { padding-block: clamp(var(--space-6), 7vw, var(--space-7)) var(--space-5); }
.page-title {
  font-family: var(--font-serif);
  font-size: var(--step-3);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

/* --------------------------------------------------------------------------
   12. 모션 — 로드 시 스태거 등장
   -------------------------------------------------------------------------- */
@keyframes rise {
  from { opacity: 0; transform: translateY(0.75rem); }
  to   { opacity: 1; transform: none; }
}
.rise { animation: rise var(--dur-base) var(--ease-out) both; }
.grid-cards > .card { animation: rise 420ms var(--ease-out) both; }
.grid-cards > .card:nth-child(1) { animation-delay:  40ms; }
.grid-cards > .card:nth-child(2) { animation-delay:  80ms; }
.grid-cards > .card:nth-child(3) { animation-delay: 120ms; }
.grid-cards > .card:nth-child(4) { animation-delay: 160ms; }
.grid-cards > .card:nth-child(5) { animation-delay: 200ms; }
.grid-cards > .card:nth-child(6) { animation-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .card:hover { transform: none; }
}