/* ============================================================
   도서관 — 홈페이지 /css/style.css·/css/diary.css 위에 책장을 얹는다.
   바깥(대지)은 다이어리와 같은 쪽빛, 안에 짙은 나무 책장을 세운다.
   ▼ 설정판
   ============================================================ */
:root {
  --wood:       #3a2414;   /* 책장 나무 */
  --wood-dark:  #1f130a;   /* 책장 안쪽(그늘) */
  --wood-edge:  #5a3a20;   /* 선반 앞면 밝은 결 */
  --brass:      #bb9d61;   /* 이름표 — 홈페이지 금실(kin) */
  --book-w:     clamp(132px, 19vw, 210px);   /* 앞표지가 보이는 책의 폭 */
}

/* ---------- 책장 틀 ---------- */
.shelf {
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 18px 18px 0;
  border-radius: 4px;
  background:
    repeating-linear-gradient(92deg, rgba(0,0,0,.10) 0 2px, transparent 2px 9px, rgba(255,220,170,.03) 9px 11px, transparent 11px 23px),
    linear-gradient(180deg, var(--wood-edge), var(--wood) 40%, #2e1c0f);
  box-shadow: 0 24px 60px rgba(0,0,0,.55), inset 0 0 0 1px rgba(255,230,190,.08);
}

/* 한 칸: 안쪽은 그늘진 뒷판, 바닥에 선반 널 */
.shelf__row {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: clamp(14px, 2.4vw, 30px);
  padding: 36px clamp(18px, 4vw, 48px) 0;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(255,214,150,.10), transparent 60%),   /* 위에서 비치는 불빛 */
    repeating-linear-gradient(90deg, rgba(0,0,0,.12) 0 1px, transparent 1px 140px),  /* 뒷판 널 이음 */
    linear-gradient(180deg, #120b05, var(--wood-dark) 30%, #2a1a0d);
  box-shadow: inset 0 18px 30px rgba(0,0,0,.7), inset 0 -6px 14px rgba(0,0,0,.5);
}
.shelf__row::after {   /* 선반 널: 윗면 + 앞면 */
  content: "";
  position: absolute; left: -18px; right: -18px; bottom: 0;
  height: 50px;
  background:
    linear-gradient(180deg, #6b4626 0 6px, #4a2e18 6px 8px, transparent 8px),
    repeating-linear-gradient(90deg, rgba(0,0,0,.08) 0 3px, transparent 3px 17px, rgba(255,220,170,.05) 17px 19px, transparent 19px 41px),
    linear-gradient(180deg, var(--wood-edge), var(--wood) 70%, #2a190c);
  box-shadow: 0 6px 12px rgba(0,0,0,.5);
}

/* ---------- 책 ---------- */
.book {
  position: relative;
  z-index: 1;
  display: block;
  margin-bottom: 44px;   /* 선반 윗면(앞면 50px 중 위 6px)에 책이 서도록 */
  color: inherit;
  text-decoration: none;
  transition: transform .35s cubic-bezier(.2,.7,.2,1);
}
/* 이름표: 선반 앞면에 붙은 놋쇠 판 */
.book__plate {
  position: absolute; left: 50%; top: calc(100% + 11px);
  transform: translateX(-50%);
  white-space: nowrap;
  padding: 3px 12px 4px;
  border-radius: 2px;
  background: linear-gradient(180deg, #d8bf86, var(--brass) 55%, #8d7240);
  box-shadow: 0 1px 2px rgba(0,0,0,.6), inset 0 1px 0 rgba(255,255,255,.35);
  color: #2b1f0e;
  font-family: var(--serif-kr);
  font-size: .74rem;
  letter-spacing: .06em;
  line-height: 1.3;
  text-align: center;
}
.book__plate b { font-weight: 700; }
.book__plate small { display: block; font-size: .64rem; letter-spacing: 0; opacity: .8; }

/* 앞표지가 보이게 세운 책 */
.book--face .book__cover {
  display: block;
  width: var(--book-w);
  aspect-ratio: 2 / 3;
  border-radius: 1px 3px 3px 1px;
  overflow: hidden;
  box-shadow: -1px 0 0 rgba(0,0,0,.4), 10px 10px 18px rgba(0,0,0,.6), 2px 2px 4px rgba(0,0,0,.5);
  position: relative;
}
.book--face .book__cover img { display: block; width: 100%; height: 100%; object-fit: cover; }
.book--face .book__cover::after {   /* 책등 쪽 접힌 그늘과 표지 윤기 */
  content: "";
  position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(0,0,0,.28), rgba(0,0,0,0) 5%, rgba(255,255,255,.07) 6.5%, rgba(0,0,0,0) 9%),
    linear-gradient(135deg, rgba(255,255,255,.10), transparent 40%);
  pointer-events: none;
}
a.book:hover, a.book:focus-visible { transform: translateY(-10px); }
a.book:focus-visible { outline: none; }
a.book:focus-visible .book__cover { outline: 2px solid var(--brass); outline-offset: 4px; }

/* 등만 보이게 꽂은 책 */
.spine {
  display: flex; flex-direction: column; align-items: center; justify-content: space-between;
  width: calc(var(--book-w) * .26);
  height: calc(var(--book-w) * 1.5 - 6px);
  padding: 14px 0 12px;
  border-radius: 3px 3px 1px 1px;
  box-shadow: inset 3px 0 6px rgba(255,255,255,.08), inset -5px 0 8px rgba(0,0,0,.45), 6px 8px 14px rgba(0,0,0,.55);
}
.spine--indigo {
  background:
    repeating-linear-gradient(0deg, rgba(255,255,255,.025) 0 1px, transparent 1px 3px),
    linear-gradient(90deg, #1b2538, #2b3954 45%, #1a2335);
}
.spine__label {   /* 세로 제첨 — 한지 띠 */
  writing-mode: vertical-rl;
  padding: 10px 4px;
  background: #e8dfc9;
  color: var(--sumi);
  font-family: var(--mincho);
  font-size: clamp(.78rem, 1.1vw, .95rem);
  letter-spacing: .18em;
  box-shadow: 0 0 0 1px rgba(0,0,0,.25);
}
.spine__foot {
  writing-mode: vertical-rl;
  color: var(--brass);
  font-family: var(--mincho);
  font-size: .62rem;
  letter-spacing: .14em;
  opacity: .8;
}
.book.is-soon { cursor: default; }
.book.is-soon .spine { filter: saturate(.7) brightness(.85); }
.book.is-soon .book__plate { opacity: .75; }

/* 책 받침(북엔드) */
.bookend {
  position: relative; z-index: 1;
  width: 16px;
  height: calc(var(--book-w) * .7);
  margin: 0 0 44px -6px;
  border-radius: 2px 2px 0 0;
  background: linear-gradient(90deg, #6b5532, #a88a52 40%, #5b4728);
  box-shadow: 4px 6px 10px rgba(0,0,0,.5);
}

.library-foot { margin: 2em 0 0; color: var(--haze); font-size: .86rem; text-align: center; }

@media (max-width: 560px) {
  .shelf { padding: 10px 10px 0; }
  :root { --book-w: 124px; }
  .spine__foot { display: none; }
  .shelf__row { padding-left: 14px; padding-right: 14px; gap: 12px; }
  .shelf__row::after { left: -10px; right: -10px; }
  .book__plate { font-size: .66rem; padding: 2px 8px 3px; }
}
@media (prefers-reduced-motion: reduce) {
  .book { transition: none; }
}

/* ---------- 책 펼치기 (누르면) ---------- */
.book.is-taken { visibility: hidden; }
.opening {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(14, 19, 28, 0);
  transition: background-color .6s ease;
}
.opening.is-lifted { background: rgba(14, 19, 28, .82); }
.opening.is-leaving { background: var(--ai); transition-duration: .45s; }
.opening__book {
  position: absolute;
  transform-origin: 0 0;
  transition: transform .65s cubic-bezier(.3,.7,.2,1);
}
.opening__page, .opening__cover, .opening__back {
  position: absolute; inset: 0;
  border-radius: 1px 3px 3px 1px;
}
/* 첫 속지: 한지에 책 이름 */
.opening__page {
  display: flex; flex-direction: row-reverse; align-items: center; justify-content: center; gap: 1.1em;   /* 세로쓰기 두 줄: 오른쪽이 책 이름 */
  background:
    linear-gradient(90deg, rgba(60,45,20,.25), rgba(60,45,20,0) 7%),
    radial-gradient(ellipse at 50% 40%, #f1ead9 55%, #e2d7bf 140%);
  color: var(--sumi);
  box-shadow: 14px 16px 40px rgba(0,0,0,.6);
  transition: opacity .45s ease;
}
.opening__page b { writing-mode: vertical-rl; font-family: var(--mincho); font-size: 1.7em; letter-spacing: .3em; font-weight: 700; }
.opening__page span { writing-mode: vertical-rl; font-family: var(--serif-kr); font-size: .62em; letter-spacing: .2em; color: #6f665a; }
.opening__page::after {   /* 인주 점 */
  content: ""; position: absolute; left: 50%; bottom: 12%; width: .4em; height: .4em; margin-left: -.2em; border-radius: 50%; background: var(--shu);
}
/* 앞표지: 왼쪽 가장자리(책등)를 축으로 넘어간다 */
.opening__cover {
  transform-origin: 0 50%;
  transform: perspective(2400px) rotateY(0);
  transform-style: preserve-3d;
  transition: transform 1s cubic-bezier(.45,.05,.25,1);
}
.opening__cover img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  box-shadow: 10px 12px 30px rgba(0,0,0,.55);
}
.opening__back {   /* 표지 안쪽 면 */
  transform: rotateY(180deg);
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  background: linear-gradient(270deg, rgba(60,45,20,.25), rgba(60,45,20,0) 7%), #e9e0cb;
  box-shadow: -14px 16px 40px rgba(0,0,0,.5);
}
.opening.is-open .opening__cover { transform: perspective(2400px) rotateY(-180deg); }
.opening.is-leaving .opening__book { transform: scale(1.04) !important; opacity: 0; transition: transform .45s ease, opacity .45s ease; }