/* =====================================================
   CHAEMBRE — Brand Case Study
   Built from the client's own book/brochure mockup —
   hero + book spreads are real exported images; only the
   OVERVIEW section is live text, typeset to spec.
   ===================================================== */

body.page-chaembre {
  --cb-bg:        #efe8d9;
  --cb-paper:     #f7f2e7;
  --cb-ink:       #1b1811;
  --cb-ink-mid:   rgba(27,24,17,0.58);
  --cb-rule:      rgba(27,24,17,0.14);

  --cb-serif:     'Playfair Display', 'Noto Serif KR', serif;
  --cb-mono:      'IBM Plex Mono', 'Courier New', monospace;
  /* section titles: Copperplate Regular 45px / -30 tracking */
  --cb-plate:     'Copperplate', 'Copperplate Gothic Light', var(--cb-serif);

  background: var(--cb-bg);
  color: var(--cb-ink);
  font-family: 'Pretendard', sans-serif;
  word-break: keep-all;
  overflow-wrap: break-word;
}

body.page-chaembre .nav {
  background: var(--cb-paper);
  border-bottom: 1px solid var(--cb-rule);
}
body.page-chaembre .nav__logo-mark,
body.page-chaembre .nav__logo-sub { color: var(--cb-ink); }
body.page-chaembre .nav__links a { color: var(--cb-ink-mid); }
body.page-chaembre .nav__links a:hover { color: var(--cb-ink); }
body.page-chaembre .nav__back { color: var(--cb-ink-mid); transition: color 0.2s; }
body.page-chaembre .nav__back:hover { color: var(--cb-ink); }

.cb-mono {
  font-family: var(--cb-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ---------- HERO ---------- */
.cb-hero {
  position: relative;
  width: 100%;
}

.cb-hero__img {
  display: block;
  width: 100%;
  height: auto;
}

.cb-hero__logo {
  position: absolute;
  left: 6%;
  top: 50%;
  transform: translateY(-50%);
  width: 16%;
  min-width: 140px;
  max-width: 260px;
  height: auto;
}

/* ---------- OVERVIEW ---------- */
.cb-content {
  background-image: url('images/chaembre/layout-content-bg.webp');
  background-size: cover;
  background-position: top center;
  background-repeat: no-repeat;
}

/* same column as the book and the spec below it, so the rule lines up */
.cb-overview {
  max-width: 1100px;
  margin: 0 auto;
  padding: 140px 32px 120px;
  text-align: center;
}

.cb-overview__title {
  font-family: var(--cb-plate);
  font-weight: 400;
  font-size: 15px;
  letter-spacing: -0.03em;
  color: #000;
}

.cb-overview__body {
  margin-top: 44px;
}

.cb-overview__rule {
  border: 0;
  border-top: 1px solid rgba(27, 24, 17, 0.35);
  margin: 64px 0 0;
}

.cb-overview__img {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 72px;
}

.cb-overview__logo {
  display: block;
  width: 220px;
  height: auto;
  margin: 72px auto 0;
}

.cb-overview__body p {
  font-size: 18px;
  line-height: 30px;
  letter-spacing: -0.03em;
  color: #000;
}

.cb-overview__body p.cb-overview__line1 {
  font-family: 'Pretendard', sans-serif;
  font-weight: 700;
}

.cb-overview__body p.cb-overview__line2 {
  font-family: 'Pretendard', sans-serif;
  font-weight: 500;
}

/* ---------- BOOK (page-flip viewer) ---------- */
.cb-flip {
  max-width: 1100px;
  margin: 0 auto;
  /* side padding leaves room for the cover, which overhangs the pages */
  padding: 40px 32px 96px;
}

.cb-flip__stage {
  position: relative;
  width: 100%;
  aspect-ratio: 1491 / 958;
  cursor: pointer;
}

.cb-flip__stack {
  position: relative;
  width: 100%;
  height: 100%;
  perspective: 2400px;
}

/* The leaf that turns, hinged on the spine. It is a real two-sided sheet:
   front = this spread's right page, back = the next spread's left page.
   A turned leaf stays where it lands, so it *is* the left page — nothing
   is ever swapped in behind it and there is no timing to get wrong. */
.cb-flip__leaf {
  position: absolute;
  top: 0;
  right: 0;
  width: 48.69%;
  height: 100%;
  transform-origin: left center;
  transform: rotateY(0deg);
  transform-style: preserve-3d;
  transition: transform 1.5s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.cb-flip__leaf.is-flipped {
  transform: rotateY(-180deg);
}

/* pages too far either side of the spread on show */
.cb-flip__leaf.is-out {
  visibility: hidden;
}

.cb-flip__face {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  object-fit: contain;
  backface-visibility: hidden;
}

.cb-flip__face--front {
  width: 100%;
  object-position: left center;
  transform: translateZ(0.5px);
}

/* the board is a shade larger than the pages it closes over, so the
   page edges underneath stay hidden — as on a real book */
.cb-flip__face--cover {
  width: 105.6%;
}

/* the back is a left page, so it is wider than the leaf; mirroring it
   about its own centre lands it exactly in the left-hand zone */
.cb-flip__face--back {
  width: 105.37%;
  transform: rotateY(180deg) translateZ(0.5px);
}

.cb-flip__controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  margin-top: 36px;
}

.cb-flip__arrow {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--cb-rule);
  background: var(--cb-paper);
  color: var(--cb-ink);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}

.cb-flip__arrow:hover { background: var(--cb-bg); }

.cb-flip__counter {
  color: var(--cb-ink-mid);
  min-width: 64px;
  text-align: center;
}

/* ---------- SPEC (monogram / palette / type / tools) ---------- */
.cb-spec {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px 160px;
}

.cb-spec__row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 56px;
  margin-bottom: 72px;
}

.cb-spec__label {
  font-family: var(--cb-plate);
  font-weight: 400;
  font-size: 15px;
  letter-spacing: -0.03em;
  white-space: nowrap;
  text-align: center;
  color: #000;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(27, 24, 17, 0.35);
}

.cb-spec__body {
  padding-top: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 190px;
}

.cb-spec__monogram {
  width: 104px;
  height: auto;
}

.cb-spec__palette {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 14px 26px;
  justify-content: center;
}

.cb-spec__palette img {
  width: 58px;
  height: auto;
}

/* hover spins the mark clockwise; on leave it carries on round to upright
   rather than snapping back, since the keyhole has to end up pointing down */
@keyframes cb-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.cb-spec__palette img.is-spinning {
  animation: cb-spin 1.1s linear infinite;
}

.cb-spec__palette img.is-settling {
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-reduced-motion: reduce) {
  .cb-spec__palette img.is-spinning { animation: none; }
  .cb-spec__palette img.is-settling { transition: none; }
}

.cb-spec__type {
  flex-direction: column;
  gap: 18px;
  text-align: center;
}

.cb-spec__face { color: var(--cb-ink); line-height: 1.2; }
.cb-spec__face--copperplate {
  font-family: var(--cb-plate);
  font-size: 26px;
  letter-spacing: 0.02em;
}
.cb-spec__face--helvetica {
  font-family: Helvetica, 'Helvetica Neue', Arial, sans-serif;
  font-size: 20px;
}
.cb-spec__face--pretendard {
  font-family: 'Pretendard', sans-serif;
  font-size: 15px;
}

.cb-spec__tools {
  list-style: none;
  margin: 0;
  padding: 44px 0 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
}

.cb-tool {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.cb-tool__icon {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
}

.cb-tool__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-family: 'Pretendard', sans-serif;
}

.cb-tool__text strong {
  font-size: 13px;
  font-weight: 600;
  color: var(--cb-ink);
  margin-bottom: 2px;
}

.cb-tool__text span {
  font-size: 11px;
  line-height: 1.45;
  color: var(--cb-ink-mid);
}

/* ---------- FOOTER NAV ---------- */
.cb-footer-nav {
  padding: 40px 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--cb-paper);
  border-top: 1px solid var(--cb-rule);
}

.cb-footer-nav a {
  color: var(--cb-ink-mid);
  transition: color 0.2s;
}
.cb-footer-nav a:hover { color: var(--cb-ink); }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 900px) {
  .cb-hero__logo { left: 8%; width: 30%; min-width: 100px; }
  .cb-overview { padding: 90px 24px 80px; }
  .cb-overview__body { margin-top: 32px; }
  .cb-overview__body p { font-size: 15px; line-height: 26px; }
  .cb-overview__rule { margin-top: 44px; }
  .cb-overview__img { margin-top: 40px; }
  .cb-overview__logo { width: 160px; margin-top: 40px; }
  .cb-flip { padding: 24px 24px 90px; }
  .cb-flip__controls { gap: 20px; margin-top: 24px; }
  .cb-flip__arrow { width: 36px; height: 36px; font-size: 18px; }
  .cb-spec { padding: 0 24px 90px; }
  .cb-spec__row { grid-template-columns: 1fr; gap: 40px; margin-bottom: 40px; }
  .cb-spec__body { padding-top: 28px; min-height: 0; }
  .cb-spec__tools { grid-template-columns: 1fr 1fr; gap: 20px; padding-top: 28px; }
  .cb-footer-nav { padding: 28px 24px; flex-direction: column; gap: 16px; }
}