:root {
  --ink: #452826;
  --wine: #933a3b;
  --wine-dark: #6f2f31;
  --blush: #faeeee;
  --cream: #fff8f4;
  --paper: #fffaf7;
  --muted: #866563;
  --line: rgba(147, 58, 59, 0.18);
  --shadow: 0 30px 80px rgba(72, 33, 30, 0.20);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, #fff 0, var(--cream) 30%, #f5e7e1 100%);
}

.background-glow {
  position: fixed;
  inset: auto -20% -35% auto;
  width: 52vw;
  height: 52vw;
  border-radius: 50%;
  background: rgba(147, 58, 59, 0.10);
  filter: blur(55px);
  pointer-events: none;
}

.topbar {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-block h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 0.95;
  color: var(--wine-dark);
  letter-spacing: -0.045em;
}

.brand-block p,
.info-panel p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.eyebrow {
  display: inline-flex;
  margin-bottom: 8px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--wine-dark);
  background: rgba(255, 255, 255, 0.58);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.top-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }

.btn,
.small-btn,
.icon-btn {
  border: 0;
  border-radius: 999px;
  font-weight: 800;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, opacity .2s ease;
  font-family: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  text-decoration: none;
}

.btn-primary {
  color: white;
  background: linear-gradient(135deg, var(--wine), var(--wine-dark));
  box-shadow: 0 12px 30px rgba(147, 58, 59, 0.26);
}

.btn-ghost {
  color: var(--wine-dark);
  background: rgba(255,255,255,0.72);
  border: 1px solid var(--line);
}

.btn:hover,
.small-btn:hover,
.icon-btn:hover { transform: translateY(-1px); }

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 24px;
  align-items: start;
}

.viewer-card,
.info-panel,
.thumbs-wrap {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.70);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.viewer-card {
  border-radius: 34px;
  padding: 18px;
  overflow: hidden;
}

.toolbar,
.progress-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.toolbar { margin-bottom: 16px; }

.icon-btn {
  width: 48px;
  height: 48px;
  font-size: 2rem;
  line-height: 1;
  color: var(--wine-dark);
  background: var(--blush);
}

.icon-btn:disabled { opacity: .35; cursor: not-allowed; transform: none; }

.page-status {
  display: grid;
  gap: 3px;
  text-align: center;
}

.page-status strong { color: var(--wine-dark); }
.page-status span { color: var(--muted); font-size: .9rem; }

.book-stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: clamp(420px, 72vw, 760px);
  padding: clamp(10px, 2vw, 28px);
  border-radius: 28px;
  background:
    linear-gradient(90deg, rgba(78,44,40,.08), transparent 18%, transparent 82%, rgba(78,44,40,.10)),
    radial-gradient(circle at 50% 48%, #fffdfb 0, #f5e3dc 72%);
  overflow: hidden;
}

.book {
  position: relative;
  width: min(100%, 880px);
  aspect-ratio: 1800 / 1288;
  perspective: 2600px;
  filter: drop-shadow(0 38px 48px rgba(75, 35, 32, 0.24));
}

.book::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -1%;
  bottom: -1%;
  width: 18px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, rgba(0,0,0,.18), rgba(255,255,255,.2), rgba(0,0,0,.18));
  z-index: 50;
  border-radius: 99px;
  pointer-events: none;
}

.sheet {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  transform-origin: left center;
  transform-style: preserve-3d;
  transition: transform 760ms cubic-bezier(.2, .78, .22, 1);
}

.sheet.flipped { transform: rotateY(-180deg); }

.page {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: var(--paper);
  border-radius: 0 14px 14px 0;
  backface-visibility: hidden;
  box-shadow: inset -18px 0 32px rgba(68, 40, 37, .08), 0 10px 28px rgba(68, 40, 37, .14);
}

.page.back {
  transform: rotateY(180deg);
  border-radius: 14px 0 0 14px;
  box-shadow: inset 18px 0 32px rgba(68, 40, 37, .08), 0 10px 28px rgba(68, 40, 37, .10);
}

.page img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  background: var(--paper);
}

.page.blank {
  display: grid;
  place-items: center;
  color: rgba(147, 58, 59, .38);
  font-size: clamp(1.3rem, 3vw, 2rem);
  letter-spacing: .14em;
  text-transform: uppercase;
}

.stage-hit {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 20%;
  border: 0;
  background: transparent;
  cursor: pointer;
  z-index: 70;
}
.stage-hit.left { left: 0; }
.stage-hit.right { right: 0; }

.progress-row { margin-top: 16px; }

input[type="range"] {
  width: 100%;
  accent-color: var(--wine);
}

.small-btn {
  flex: 0 0 auto;
  padding: 10px 15px;
  color: var(--wine-dark);
  background: var(--blush);
}

.info-panel {
  border-radius: 28px;
  padding: 24px;
  position: sticky;
  top: 20px;
}

.info-panel h2 {
  margin: 0;
  color: var(--wine-dark);
  font-size: 1.35rem;
}

.contact-card {
  margin-top: 20px;
  padding: 18px;
  display: grid;
  gap: 10px;
  border-radius: 22px;
  background: var(--blush);
}

.contact-card span {
  font-size: .78rem;
  font-weight: 900;
  color: var(--wine-dark);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.contact-card a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.thumbs-wrap {
  width: min(1180px, calc(100% - 32px));
  margin: 24px auto 42px;
  padding: 14px;
  border-radius: 24px;
}

.thumbs {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 4px 2px 8px;
  scrollbar-color: var(--wine) transparent;
}

.thumb {
  flex: 0 0 74px;
  border: 2px solid transparent;
  border-radius: 14px;
  padding: 0;
  background: transparent;
  cursor: pointer;
  overflow: hidden;
  position: relative;
}

.thumb.active { border-color: var(--wine); }

.thumb img {
  width: 100%;
  display: block;
  aspect-ratio: 900 / 1288;
  object-fit: cover;
}

.thumb span {
  position: absolute;
  right: 5px;
  bottom: 5px;
  padding: 2px 6px;
  border-radius: 999px;
  background: rgba(255,255,255,.88);
  color: var(--wine-dark);
  font-size: .72rem;
  font-weight: 900;
}

@media (max-width: 960px) {
  .topbar,
  .shell { grid-template-columns: 1fr; }
  .topbar { flex-direction: column; align-items: flex-start; }
  .top-actions { justify-content: flex-start; }
  .info-panel { position: static; }
}

@media (max-width: 640px) {
  .viewer-card { padding: 12px; border-radius: 24px; }
  .book-stage { min-height: 360px; padding: 8px; }
  .toolbar { gap: 8px; }
  .icon-btn { width: 42px; height: 42px; }
  .btn { width: 100%; }
  .top-actions { width: 100%; }
  .thumb { flex-basis: 58px; }
}