:root {
  --booklet-card-border: rgba(120, 98, 64, 0.16);
  --booklet-shadow: 0 28px 56px rgba(70, 59, 41, 0.14);
  --booklet-ink: #1f3f39;
  --booklet-muted: #5d6d68;
  --booklet-accent-strong: #214f47;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top right, rgba(71, 143, 182, 0.14), transparent 28%),
    radial-gradient(circle at bottom left, rgba(69, 124, 81, 0.16), transparent 24%),
    linear-gradient(180deg, #f9f4e7 0%, #f4eee2 48%, #f0ebdd 100%);
  color: var(--booklet-ink);
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
  padding-bottom: calc(124px + env(safe-area-inset-bottom, 0px));
}

.hidden {
  display: none !important;
}

.booklet-app {
  min-height: 100vh;
}

.booklet-topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  gap: 0.9rem;
  padding: calc(0.95rem + env(safe-area-inset-top, 0px)) 1rem 0.95rem;
  background:
    linear-gradient(180deg, rgba(250, 246, 236, 0.98), rgba(250, 246, 236, 0.92)),
    rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(120, 98, 64, 0.12);
}

.booklet-topbar__back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  width: fit-content;
  padding: 0.7rem 0.9rem;
  border-radius: 999px;
  background: rgba(47, 111, 97, 0.1);
  color: var(--booklet-accent-strong);
  text-decoration: none;
  font-weight: 700;
}

.booklet-topbar__copy {
  display: grid;
  gap: 0.2rem;
}

.booklet-topbar__eyebrow,
.booklet-slide__page,
.booklet-sheet__eyebrow,
.booklet-sheet__item-page,
.booklet-toolbar__count,
.booklet-intro__eyebrow {
  color: #7a6640;
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.booklet-topbar__title,
.booklet-intro__title,
.booklet-sheet__title,
.booklet-slide__title {
  margin: 0;
  line-height: 1.08;
}

.booklet-topbar__title {
  font-size: clamp(1.6rem, 1.2rem + 2vw, 2.5rem);
}

.booklet-topbar__meta,
.booklet-intro__copy {
  color: var(--booklet-muted);
}

.booklet-topbar__actions,
.booklet-intro__actions {
  display: grid;
  gap: 0.7rem;
}

.booklet-topbar__actions {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.booklet-topbar__action,
.booklet-primary-btn,
.booklet-secondary-btn,
.booklet-toolbar__btn,
.booklet-sheet__close,
.booklet-sheet__item {
  appearance: none;
  border: none;
  font: inherit;
}

.booklet-topbar__action,
.booklet-primary-btn,
.booklet-secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0.85rem 1rem;
  border-radius: 16px;
  text-decoration: none;
  font-weight: 800;
}

.booklet-topbar__action,
.booklet-primary-btn {
  background: linear-gradient(135deg, #336f63, #1f4f48);
  color: #fff;
  box-shadow: 0 18px 34px rgba(31, 79, 72, 0.18);
}

.booklet-topbar__action--secondary,
.booklet-secondary-btn {
  background: rgba(255, 255, 255, 0.72);
  color: var(--booklet-accent-strong);
  border: 1px solid rgba(47, 111, 97, 0.18);
}

.booklet-main {
  display: grid;
  gap: 1rem;
  padding: 1rem 1rem 0;
}

.booklet-intro,
.booklet-slide__card {
  border: 1px solid var(--booklet-card-border);
  border-radius: 26px;
  background:
    radial-gradient(circle at top right, rgba(220, 193, 138, 0.2), transparent 36%),
    linear-gradient(145deg, rgba(255, 252, 246, 0.96), rgba(245, 238, 224, 0.88)),
    rgba(255, 252, 246, 0.92);
  box-shadow: var(--booklet-shadow);
}

.booklet-intro {
  display: grid;
  overflow: hidden;
}

.booklet-intro__media img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.booklet-intro__content {
  display: grid;
  gap: 0.8rem;
  padding: 1rem;
}

.booklet-intro__title {
  font-size: 1.5rem;
}

.booklet-intro__copy {
  margin: 0;
  line-height: 1.58;
}

.booklet-viewer {
  margin-inline: -1rem;
}

.booklet-track {
  display: flex;
  gap: 0.9rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  padding: 0 1rem 0.4rem;
  scrollbar-width: none;
}

.booklet-track::-webkit-scrollbar,
.booklet-dots::-webkit-scrollbar {
  display: none;
}

.booklet-slide {
  flex: 0 0 calc(100vw - 2rem);
  scroll-snap-align: start;
}

.booklet-slide__head {
  display: grid;
  gap: 0.25rem;
  padding: 0.95rem 1rem 0;
}

.booklet-slide__title {
  font-size: 1.18rem;
}

.booklet-slide__media {
  padding: 0.8rem;
}

.booklet-slide__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 14px 26px rgba(37, 50, 46, 0.08);
}

.booklet-toolbar {
  position: fixed;
  left: 50%;
  bottom: calc(0.85rem + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  z-index: 35;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.65rem;
  width: min(720px, calc(100% - 1.25rem));
  padding: 0.6rem;
  border-radius: 24px;
  background: rgba(15, 23, 42, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 24px 48px rgba(2, 6, 23, 0.28);
  backdrop-filter: blur(16px);
}

.booklet-toolbar__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
}

.booklet-toolbar__btn:disabled {
  opacity: 0.42;
  cursor: default;
}

.booklet-toolbar__status {
  display: grid;
  gap: 0.12rem;
  text-align: center;
  color: #fff;
}

.booklet-toolbar__count {
  color: rgba(255, 255, 255, 0.72);
}

.booklet-toolbar__title {
  font-size: 0.95rem;
  font-weight: 700;
}

.booklet-dots {
  position: fixed;
  left: 50%;
  bottom: calc(5.8rem + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  z-index: 20;
  display: flex;
  gap: 0.4rem;
  width: min(680px, calc(100% - 2.2rem));
  overflow-x: auto;
  justify-content: center;
  padding: 0.2rem 0;
  scrollbar-width: none;
}

.booklet-dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  padding: 0;
  border: none;
  border-radius: 999px;
  background: rgba(31, 79, 72, 0.22);
  cursor: pointer;
}

.booklet-dot.is-active {
  width: 28px;
  background: linear-gradient(135deg, #3d7b6b, #25544d);
}

.booklet-sheet-backdrop {
  position: fixed;
  inset: 0;
  z-index: 45;
  background: rgba(15, 23, 42, 0.48);
}

.booklet-sheet {
  position: fixed;
  inset: auto 0 0;
  z-index: 50;
  display: grid;
  gap: 0.85rem;
  max-height: 78vh;
  padding: 1rem 1rem calc(1rem + env(safe-area-inset-bottom, 0px));
  border-radius: 28px 28px 0 0;
  background: rgba(248, 243, 232, 0.98);
  box-shadow: 0 -18px 42px rgba(15, 23, 42, 0.2);
}

.booklet-sheet__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.booklet-sheet__close {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(31, 79, 72, 0.12);
  color: var(--booklet-accent-strong);
  cursor: pointer;
}

.booklet-sheet__list {
  display: grid;
  gap: 0.6rem;
  overflow-y: auto;
}

.booklet-sheet__item {
  display: grid;
  gap: 0.18rem;
  width: 100%;
  padding: 0.95rem 1rem;
  border: 1px solid rgba(31, 79, 72, 0.1);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.booklet-sheet__item-title {
  font-size: 1rem;
  font-weight: 700;
}

.booklet-sheet__item.is-active {
  border-color: rgba(31, 79, 72, 0.32);
  background: rgba(217, 232, 222, 0.72);
}

html[data-theme="dark"],
body[data-theme="dark"] {
  background:
    radial-gradient(circle at top right, rgba(34, 211, 238, 0.1), transparent 26%),
    radial-gradient(circle at bottom left, rgba(74, 222, 128, 0.08), transparent 20%),
    linear-gradient(180deg, #07111e 0%, #0f172a 48%, #111827 100%);
  color: #eff6f1;
}

html[data-theme="dark"] .booklet-topbar {
  background:
    linear-gradient(180deg, rgba(9, 16, 28, 0.98), rgba(9, 16, 28, 0.94)),
    rgba(15, 23, 42, 0.9);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

html[data-theme="dark"] .booklet-topbar__back {
  background: rgba(56, 189, 154, 0.12);
  color: #d1fae5;
}

html[data-theme="dark"] .booklet-topbar__eyebrow,
html[data-theme="dark"] .booklet-slide__page,
html[data-theme="dark"] .booklet-sheet__eyebrow,
html[data-theme="dark"] .booklet-sheet__item-page,
html[data-theme="dark"] .booklet-intro__eyebrow {
  color: #fcd34d;
}

html[data-theme="dark"] .booklet-topbar__meta,
html[data-theme="dark"] .booklet-intro__copy {
  color: #c0d0cb;
}

html[data-theme="dark"] .booklet-intro,
html[data-theme="dark"] .booklet-slide__card {
  background:
    radial-gradient(circle at top right, rgba(250, 204, 21, 0.1), transparent 36%),
    linear-gradient(145deg, rgba(20, 29, 39, 0.98), rgba(16, 24, 34, 0.96)),
    rgba(17, 24, 39, 0.94);
  border-color: rgba(173, 148, 99, 0.18);
  box-shadow: 0 30px 64px rgba(2, 6, 23, 0.35);
}

html[data-theme="dark"] .booklet-topbar__action--secondary,
html[data-theme="dark"] .booklet-secondary-btn {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.08);
  color: #ecfdf5;
}

html[data-theme="dark"] .booklet-sheet {
  background: rgba(10, 16, 28, 0.98);
  box-shadow: 0 -18px 42px rgba(2, 6, 23, 0.4);
}

html[data-theme="dark"] .booklet-sheet__close {
  background: rgba(255, 255, 255, 0.08);
  color: #ecfdf5;
}

html[data-theme="dark"] .booklet-sheet__item {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.08);
}

html[data-theme="dark"] .booklet-sheet__item.is-active {
  background: rgba(45, 107, 91, 0.26);
  border-color: rgba(74, 222, 128, 0.22);
}

@media (min-width: 720px) {
  body {
    padding-bottom: 9rem;
  }

  .booklet-topbar {
    grid-template-columns: auto 1fr auto;
    align-items: center;
  }

  .booklet-topbar__actions {
    grid-template-columns: repeat(2, auto);
  }

  .booklet-main {
    max-width: 1040px;
    margin: 0 auto;
    padding: 1.25rem 1.25rem 0;
  }

  .booklet-intro {
    grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  }

  .booklet-viewer {
    margin-inline: 0;
  }

  .booklet-slide {
    flex-basis: 100%;
  }

  .booklet-track {
    padding-inline: 0;
  }
}