@charset "utf-8";
/* ============================================================
   WORKNEST — 메인 화면
   핵심: 3D 책이 조립되고 겉표지가 한 겹씩 입혀지는 인트로 애니메이션
   ============================================================ */

/* ── 히어로 무대 ──────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  /* 헤더는 흐름 안에 있으므로, 그만큼 위로 끌어올려 헤더가 히어로 위에 겹치게 한다.
     (이 처리가 없으면 투명한 헤더 뒤로 흰 배경이 보이고 흰 글자가 사라진다) */
  margin-top: calc(var(--header-h) * -1);
  padding: calc(var(--header-h) + 30px) 0 70px;
  display: flex; align-items: center;
  background: radial-gradient(120% 90% at 50% 0%, #17233D 0%, var(--navy) 55%, #080D18 100%);
  color: #fff; overflow: hidden;
}

/* 배경 장식 — 브랜드 색 오라 */
.hero::before, .hero::after {
  content: ''; position: absolute; border-radius: 50%;
  filter: blur(90px); opacity: 0; pointer-events: none;
  transition: opacity 1.6s var(--ease);
}
.hero::before { width: 620px; height: 620px; left: -180px; top: -120px; background: rgba(53,178,223,.34); }
.hero::after  { width: 560px; height: 560px; right: -160px; bottom: -180px; background: rgba(124,79,168,.32); }
.intro-ready .hero::before { opacity: 1; }
.intro-ready .hero::after  { opacity: 1; }

.hero-grid {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1.02fr .98fr;
  gap: 56px; align-items: center; width: 100%;
}

/* ── 히어로 글 ────────────────────────────────────────────── */
.hero-copy > * {
  opacity: 0; transform: translateY(20px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.intro-done .hero-copy > *      { opacity: 1; transform: none; }
.intro-done .hero-copy > *:nth-child(1) { transition-delay: .05s; }
.intro-done .hero-copy > *:nth-child(2) { transition-delay: .14s; }
.intro-done .hero-copy > *:nth-child(3) { transition-delay: .23s; }
.intro-done .hero-copy > *:nth-child(4) { transition-delay: .32s; }
.intro-done .hero-copy > *:nth-child(5) { transition-delay: .41s; }

.hero .eyebrow { color: var(--cyan); }
.hero .eyebrow::before { background: linear-gradient(90deg, var(--cyan), transparent); }

.hero h1 {
  margin: 16px 0 18px;
  font-size: clamp(2rem, 1.2rem + 3vw, 3.3rem);
  line-height: 1.24; letter-spacing: -.03em;
}
.hero h1 .accent {
  background: linear-gradient(100deg, #7FD9F5 0%, #8FB4FF 50%, #C0A2FF 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero-desc { color: rgba(255,255,255,.72); font-size: 1.04rem; max-width: 480px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.hero-meta {
  display: flex; flex-wrap: wrap; gap: 10px 26px;
  margin-top: 34px; padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,.12);
  font-size: .86rem; color: rgba(255,255,255,.55);
}
.hero-meta b { display: block; color: #fff; font-size: 1.32rem; font-weight: 800; letter-spacing: -.02em; }

/* ── 책 무대 ──────────────────────────────────────────────── */
.book-stage {
  position: relative;
  display: grid; place-items: center;
  min-height: 520px;
  perspective: 1800px;
  perspective-origin: 50% 46%;
}

.book-link {
  display: block; position: relative;
  transform-style: preserve-3d;
  cursor: pointer;
  transition: transform .55s var(--ease);
}

/* 책 본체 — 조립 전에는 눕혀져 있다가 세워진다 */
.book3d {
  --bw: clamp(210px, 19vw, 290px);           /* 표지 가로 */
  --bh: calc(var(--bw) * 1.414);             /* A4 비율 */
  --bd: clamp(26px, 2.4vw, 38px);            /* 책 두께 */

  position: relative;
  width: var(--bw); height: var(--bh);
  transform-style: preserve-3d;
  transform: rotateX(78deg) rotateY(0deg) rotateZ(-12deg) translateZ(-40px);
  transition: transform 1.15s var(--ease);
}
/* 1단계: 책이 세워진다 */
.stage-1 .book3d { transform: rotateX(8deg) rotateY(-26deg) rotateZ(0deg); }
/* 완료 후 가볍게 정면을 향한다 */
.stage-4 .book3d { transform: rotateX(6deg) rotateY(-21deg); }

.book3d > * { position: absolute; inset: 0; border-radius: 3px 7px 7px 3px; }

/* 뒷표지 */
.book3d__back {
  background: linear-gradient(145deg, #16233B, #0C1424);
  transform: translateZ(calc(var(--bd) * -1));
  box-shadow: inset 0 0 40px rgba(0,0,0,.5);
  opacity: 0; transition: opacity .5s var(--ease);
}
.stage-2 .book3d__back { opacity: 1; }

/* 종이 뭉치 — 위에서부터 한 장씩 쌓이는 느낌 */
.book3d__pages {
  left: 4px; right: 3px; top: 5px; bottom: 5px;
  background:
    repeating-linear-gradient(90deg, #FFFFFF 0 2px, #E8ECF3 2px 4px);
  transform: translateZ(calc(var(--bd) * -0.5));
  border-radius: 2px 5px 5px 2px;
  box-shadow: 0 0 0 1px rgba(0,0,0,.06);
  transform-origin: left center;
  opacity: 0; clip-path: inset(0 0 100% 0);
  transition: opacity .35s var(--ease), clip-path .85s var(--ease);
}
.stage-2 .book3d__pages { opacity: 1; clip-path: inset(0 0 0 0); transition-delay: .18s; }

/* 책등 */
.book3d__spine {
  left: 0; width: var(--bd);
  /* -90도 돌린 뒤, 회전된 좌표계 기준으로 책 왼쪽 옆면 자리에 맞춘다 */
  transform: rotateY(-90deg) translateX(calc(var(--bd) * -0.5)) translateZ(calc(var(--bd) * 0.5));
  background: linear-gradient(180deg, #2A3A55, #14213A 60%, #0B1220);
  border-radius: 3px 0 0 3px;
  display: grid; place-items: center;
  opacity: 0; transform-origin: center;
  transition: opacity .55s var(--ease);
}
.stage-1 .book3d__spine { opacity: 1; }
.book3d__spine i {
  display: block; width: 3px; height: 46%;
  border-radius: 3px; background: var(--brand-gradient);
  opacity: .95;
}

/* 앞표지 */
.book3d__cover {
  overflow: hidden;
  background: linear-gradient(150deg, #1F3A6E, #14224A);
  box-shadow: 0 0 0 1px rgba(255,255,255,.06);
  /* 3단계 전에는 뒤로 젖혀져 있다 */
  transform-origin: left center;
  transform: rotateY(-118deg);
  opacity: 0;
  transition: transform .95s var(--ease), opacity .3s var(--ease);
}
.stage-3 .book3d__cover { transform: rotateY(0deg); opacity: 1; }

/* 겉표지 레이어 ① 브랜드 바탕 */
.book3d__coat {
  position: absolute; inset: 0;
  background: var(--brand-gradient);
  clip-path: inset(0 0 100% 0);
  transition: clip-path .8s var(--ease);
}
.stage-3 .book3d__coat { clip-path: inset(0 0 0 0); transition-delay: .45s; }

/* 겉표지 레이어 ② 실제 표지 이미지가 위에서 아래로 입혀진다 */
.book3d__art {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover;
  clip-path: inset(0 0 100% 0);
  transition: clip-path .95s var(--ease);
}
.stage-3 .book3d__art { clip-path: inset(0 0 0 0); transition-delay: 1.05s; }

/* 겉표지 레이어 ③ 광택이 한 번 스쳐 지나간다 */
.book3d__gloss {
  position: absolute; inset: -30% -60%;
  background: linear-gradient(100deg,
      transparent 38%, rgba(255,255,255,.42) 50%, transparent 62%);
  transform: translateX(-120%);
  pointer-events: none;
}
.stage-4 .book3d__gloss { animation: coverGloss 1.25s var(--ease) .1s both; }
@keyframes coverGloss {
  to { transform: translateX(120%); }
}

/* 표지 가장자리 음영 */
.book3d__cover::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(90deg, rgba(0,0,0,.34) 0%, rgba(0,0,0,.10) 6%, transparent 16%);
}

/* 바닥 그림자 */
.book-shadow {
  position: absolute; left: 50%; bottom: 6%;
  width: clamp(230px, 22vw, 330px); height: 34px;
  transform: translateX(-50%) scaleX(.7);
  background: radial-gradient(ellipse at center, rgba(0,0,0,.62), transparent 68%);
  filter: blur(11px);
  opacity: 0; transition: opacity .8s var(--ease), transform 1s var(--ease);
}
.stage-1 .book-shadow { opacity: .9; transform: translateX(-50%) scaleX(1); }

/* 조립이 끝나면 위아래로 천천히 떠 있는다 */
.stage-4 .book-link { animation: bookFloat 6s ease-in-out 1.2s infinite; }
@keyframes bookFloat {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-13px); }
}

/* 마우스를 올리면 살짝 앞으로 */
.book-link:hover  { animation-play-state: paused; }
.book-link:hover  .book3d { transform: rotateX(4deg) rotateY(-13deg) scale(1.035); }
.book-link:focus-visible .book3d { transform: rotateX(4deg) rotateY(-13deg) scale(1.035); }

/* 책 아래 안내 */
.book-caption {
  position: absolute; left: 50%; bottom: -6px;
  transform: translateX(-50%);
  text-align: center; width: max-content; max-width: 90%;
  opacity: 0; transition: opacity .7s var(--ease) .5s;
}
.stage-4 .book-caption { opacity: 1; }
.book-caption strong { display: block; font-size: .95rem; color: #fff; }
.book-caption span {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 5px;
  font-size: .82rem; color: rgba(255,255,255,.6);
}
.book-caption span::after {
  content: '→'; transition: transform .25s var(--ease);
}
.book-link:hover + .book-caption span::after { transform: translateX(4px); }

/* 조립 진행 표시 */
.intro-progress {
  position: absolute; left: 50%; top: 8px; transform: translateX(-50%);
  width: 120px; height: 3px; border-radius: 3px;
  background: rgba(255,255,255,.14); overflow: hidden;
  transition: opacity .5s var(--ease);
}
.intro-progress i {
  display: block; width: 0; height: 100%;
  background: var(--brand-gradient);
  transition: width .8s var(--ease);
}
.stage-1 .intro-progress i { width: 34%; }
.stage-2 .intro-progress i { width: 62%; }
.stage-3 .intro-progress i { width: 88%; }
.stage-4 .intro-progress   { opacity: 0; }
.stage-4 .intro-progress i { width: 100%; }

/* 스크롤 안내 */
.scroll-hint {
  position: absolute; left: 50%; bottom: 22px; transform: translateX(-50%);
  z-index: 3; display: grid; justify-items: center; gap: 7px;
  font-size: .74rem; letter-spacing: .16em; text-transform: uppercase;
  color: rgba(255,255,255,.42);
  opacity: 0; transition: opacity .8s var(--ease) 1s;
}
.intro-done .scroll-hint { opacity: 1; }
.scroll-hint i {
  display: block; width: 1px; height: 30px;
  background: linear-gradient(180deg, rgba(255,255,255,.5), transparent);
  animation: hintDrop 2.1s ease-in-out infinite;
}
@keyframes hintDrop {
  0%, 100% { transform: scaleY(.4); transform-origin: top; opacity: .3; }
  50%      { transform: scaleY(1);  transform-origin: top; opacity: 1; }
}

/* ── 과목 목록 (책장) ─────────────────────────────────────── */
.shelf {
  display: grid; gap: 22px;
  grid-template-columns: repeat(auto-fill, minmax(232px, 1fr));
}

.shelf-item {
  position: relative;
  display: flex; flex-direction: column;
  padding: 22px 20px 20px;
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--r-lg);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.shelf-item.is-ready:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-3); border-color: #C8D6F0;
}
.shelf-item.is-soon { background: var(--bg-soft); border-style: dashed; }

.shelf-cover {
  position: relative; aspect-ratio: 3 / 4;
  border-radius: var(--r-sm); overflow: hidden;
  background: var(--bg-mute);
  box-shadow: 0 6px 18px rgba(16,24,40,.12);
  margin-bottom: 16px;
}
.shelf-cover img { width: 100%; height: 100%; object-fit: cover; }
.shelf-cover.is-empty {
  display: grid; place-items: center; box-shadow: none;
  background: repeating-linear-gradient(135deg, #EDF1F7 0 10px, #F5F8FC 10px 20px);
  color: var(--gray-3); font-size: .84rem; font-weight: 600;
}
/* 책등 느낌의 왼쪽 선 */
.shelf-cover::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 7px;
  background: linear-gradient(90deg, rgba(0,0,0,.30), transparent);
  z-index: 1;
}

.shelf-course {
  display: block; margin-bottom: 5px;
  font-size: .76rem; font-weight: 700; letter-spacing: .02em;
  color: var(--blue);
}
.shelf-item.is-soon .shelf-course { color: var(--gray-2); }
.shelf-item h3 { font-size: 1.04rem; margin-bottom: 6px; }
.shelf-item p { font-size: .87rem; color: var(--gray); line-height: 1.6; }
.shelf-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line-soft);
  font-size: .82rem; color: var(--gray-2);
}

/* ── 이용 안내 3단계 ──────────────────────────────────────── */
.howto { display: grid; gap: 20px; grid-template-columns: repeat(3, 1fr); counter-reset: howto; }
.howto-item {
  position: relative; padding: 28px 24px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
}
.howto-item::before {
  counter-increment: howto; content: counter(howto, decimal-leading-zero);
  display: block; margin-bottom: 14px;
  font-size: 1.5rem; font-weight: 800; letter-spacing: -.03em;
  background: var(--brand-gradient);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.howto-item h3 { font-size: 1.02rem; margin-bottom: 8px; }
.howto-item p { font-size: .89rem; color: var(--gray); }

/* ── 반응형 ───────────────────────────────────────────────── */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 26px; }
  .hero { min-height: auto; padding-bottom: 90px; }
  .book-stage { min-height: 430px; order: -1; }
  .hero-copy { text-align: center; }
  .hero-desc { margin-inline: auto; }
  .hero-actions, .hero-meta { justify-content: center; }
  .hero-meta { border-top: 0; }
  .howto { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .book3d { --bw: min(58vw, 220px); }
  .book-stage { min-height: 390px; }
  .scroll-hint { display: none; }
  .shelf { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .shelf-item { padding: 14px 13px 15px; border-radius: var(--r); }
  .shelf-item h3 { font-size: .94rem; }
  .shelf-item p { font-size: .8rem; }
  .shelf-foot { font-size: .76rem; }
}

/* 움직임 최소화 — 애니메이션 없이 완성된 모습으로 바로 보여준다 */
@media (prefers-reduced-motion: reduce) {
  .book3d, .book3d__cover, .book3d__coat, .book3d__art,
  .book3d__back, .book3d__pages, .book3d__spine,
  .book-shadow, .book-caption, .hero-copy > * {
    transition: none !important; animation: none !important;
  }
  .book3d { transform: rotateX(6deg) rotateY(-21deg) !important; }
  .book3d__cover { transform: none !important; opacity: 1 !important; }
  .book3d__coat, .book3d__art, .book3d__pages { clip-path: none !important; opacity: 1 !important; }
  .book3d__back, .book3d__spine { opacity: 1 !important; }
  .book-shadow { opacity: .9 !important; }
  .book-caption, .hero-copy > * { opacity: 1 !important; transform: none !important; }
  .intro-progress { display: none; }
}