/* 我们的故事：章节翻页 */
.story {
  position: relative;
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

/* 章节进度 */
.chapter-nav {
  position: sticky;
  top: var(--nav-h);
  z-index: 30;
  background: rgba(251, 247, 238, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gold-line);
}

.chapter-nav ol {
  width: var(--shell);
  margin: 0 auto;
  list-style: none;
  display: flex;
  gap: clamp(1rem, 3vw, 2.4rem);
  justify-content: center;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 0.9rem 0;
}

.chapter-nav ol::-webkit-scrollbar { display: none; }

.chapter-nav button {
  appearance: none;
  border: 0;
  background: none;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  white-space: nowrap;
  padding: 0.15rem 0;
  position: relative;
  transition: color 0.35s var(--ease);
}

.chapter-nav button::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15rem;
  width: 100%;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.45s var(--ease);
}

.chapter-nav button:hover { color: var(--ink-soft); }

.chapter-nav button[aria-current="true"] { color: var(--ink); }
.chapter-nav button[aria-current="true"]::after { transform: scaleX(1); }

.chapter-nav .no {
  font-family: var(--label);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin-right: 0.5rem;
}

/* 章节舞台：同一位置切换，高度随内容 */
.chapters {
  position: relative;
  width: var(--shell);
  margin: 0 auto;
  padding: clamp(2.6rem, 6vw, 4.5rem) 0 0;
}

.chapter {
  display: none;
}

.chapter.is-current {
  display: block;
}

/* 进出方向：向后翻从右侧来，向前翻从左侧来 */
.chapter.is-current.from-next { animation: chapter-next 0.75s var(--ease) both; }
.chapter.is-current.from-prev { animation: chapter-prev 0.75s var(--ease) both; }

@keyframes chapter-next {
  from { opacity: 0; transform: translate3d(3.5%, 0, 0); }
  to { opacity: 1; transform: none; }
}

@keyframes chapter-prev {
  from { opacity: 0; transform: translate3d(-3.5%, 0, 0); }
  to { opacity: 1; transform: none; }
}

.chapter-head {
  text-align: center;
  margin-bottom: clamp(2rem, 4.5vw, 3.2rem);
}

.chapter-head .no {
  font-family: var(--label);
  font-size: 0.66rem;
  letter-spacing: 0.34em;
  color: var(--gold);
}

.chapter-head h2 {
  margin-top: 0.9rem;
  font-weight: 400;
  font-size: clamp(1.9rem, 5vw, 2.8rem);
  letter-spacing: 0.16em;
  text-indent: 0.16em;
}

.chapter-head .when {
  margin-top: 0.7rem;
  font-style: italic;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}

.chapter-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.chapter-body.flip .chapter-media { order: 2; }

.chapter-media {
  display: grid;
  gap: 1rem;
}

.chapter-media.pair {
  grid-template-columns: 1fr 1fr;
  align-items: start;
}

.chapter-media.pair .frame:nth-child(2) {
  margin-top: 2.2rem;
}

.chapter-media.pair.mixed {
  grid-template-columns: 1.15fr 0.85fr;
}

.chapter-media.pair.mixed .frame:nth-child(2) {
  margin-top: 0;
}

/* 领证：宝丽来叠放，和其它章一样占媒体栏 */
.polaroids {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  width: 100%;
  margin: 0;
  padding: 1.2rem 0.2rem 0.8rem;
}

.polaroid {
  position: relative;
  flex: 0 0 auto;
  margin: 0;
  background: #fffaf3;
  padding: 0.55rem 0.55rem 1.05rem;
  border: 1px solid rgba(232, 214, 168, 0.5);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.85) inset,
    0 14px 28px rgba(42, 34, 22, 0.1);
  transition: transform 0.45s var(--ease), box-shadow 0.45s var(--ease);
}

.polaroid .frame {
  border-color: rgba(184, 148, 63, 0.16);
  background: #efe5d2;
}

.polaroid figcaption {
  margin: 0.62rem 0 0;
  text-align: center;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.polaroid.is-port {
  width: 36%;
  z-index: 2;
  margin-right: -10%;
  transform: rotate(-4.5deg);
}

.polaroid.is-land {
  width: 54%;
  z-index: 1;
  margin-bottom: 1.15rem;
  transform: rotate(2deg);
}

.polaroid.is-port::before {
  content: "";
  position: absolute;
  top: -0.38rem;
  left: 46%;
  width: 2.2rem;
  height: 0.55rem;
  background: rgba(212, 181, 106, 0.4);
  box-shadow: 0 1px 2px rgba(42, 34, 22, 0.08);
  transform: rotate(-3deg);
}

@media (hover: hover) and (pointer: fine) {
  .polaroid.is-port:hover {
    z-index: 3;
    transform: rotate(-1deg) translateY(-0.4rem);
    box-shadow: 0 22px 36px rgba(42, 34, 22, 0.14);
  }

  .polaroid.is-land:hover {
    z-index: 3;
    transform: rotate(0.5deg) translateY(-0.4rem);
    box-shadow: 0 22px 36px rgba(42, 34, 22, 0.14);
  }
}

.chapter-media.solo {
  max-width: min(100%, 22rem);
  justify-self: center;
}

.chapter-text p {
  color: var(--ink-soft);
  margin-bottom: 1.05rem;
}

.chapter-text p:last-child { margin-bottom: 0; }

.chapter-text .lead {
  font-size: 1.2rem;
  font-style: italic;
  color: var(--ink);
  margin-bottom: 1.4rem;
}

.chapter-quote {
  margin-top: 2rem;
  padding-left: 1.2rem;
  border-left: 1px solid var(--gold);
  font-style: italic;
  color: var(--ink);
  letter-spacing: 0.08em;
}

/* 章节内元素依次浮起 */
.chapter.is-current .chapter-head,
.chapter.is-current .chapter-media,
.chapter.is-current .chapter-text {
  animation: rise-soft 0.85s var(--ease) both;
}

.chapter.is-current .chapter-head { animation-delay: 0.05s; }
.chapter.is-current .chapter-media { animation-delay: 0.16s; }
.chapter.is-current .chapter-text { animation-delay: 0.26s; }

@keyframes rise-soft {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}

/* 翻页控件 */
.chapter-pager {
  width: var(--shell);
  margin: clamp(2.6rem, 6vw, 4rem) auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--gold-line);
  padding-top: 1.6rem;
}

.pager-btn {
  appearance: none;
  border: 0;
  background: none;
  cursor: pointer;
  font-family: var(--sans);
  color: var(--ink);
  display: grid;
  gap: 0.2rem;
  max-width: 42%;
  transition: opacity 0.3s var(--ease);
}

.pager-btn.next { text-align: right; }

.pager-btn .dir {
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.pager-btn .name {
  font-size: 1rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pager-btn:disabled {
  opacity: 0.28;
  cursor: default;
}

.pager-dots {
  display: flex;
  gap: 0.5rem;
}

.pager-dots button {
  appearance: none;
  width: 7px;
  height: 7px;
  padding: 0;
  border: 1px solid var(--gold);
  background: transparent;
  transform: rotate(45deg);
  cursor: pointer;
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}

.pager-dots button[aria-current="true"] {
  background: var(--gold);
  transform: rotate(45deg) scale(1.25);
}

/* 结尾 */
.story-end {
  width: var(--shell);
  margin: clamp(3.5rem, 8vw, 5.5rem) auto 0;
  text-align: center;
}

.story-end .script {
  font-size: clamp(1.8rem, 4.5vw, 2.5rem);
  font-style: italic;
  color: var(--gold);
}

.story-end p {
  margin: 0.9rem auto 1.8rem;
  max-width: 30rem;
  color: var(--ink-soft);
}

@media (max-width: 900px) {
  .chapter-body {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .chapter-body.flip .chapter-media { order: 0; }

  /* 注意：grid 子项用 auto 外边距会退化成按内容宽度，这里用 justify-self 居中 */
  .chapter-media {
    width: min(100%, 26rem);
    justify-self: center;
  }

  .chapter-media.pair .frame:nth-child(2) { margin-top: 1.4rem; }

  .polaroids {
    width: 100%;
    padding: 1.2rem 0.2rem 1rem;
  }

  .polaroid.is-port {
    width: 40%;
    margin-right: -8%;
    transform: rotate(-3.5deg);
  }

  .polaroid.is-land {
    width: 58%;
    margin-bottom: 0.85rem;
    transform: rotate(1.5deg);
  }
}

@media (max-width: 720px) {
  .chapter-nav ol { justify-content: flex-start; }
  .pager-btn .name { max-width: 8.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  .chapter.is-current,
  .chapter.is-current .chapter-head,
  .chapter.is-current .chapter-media,
  .chapter.is-current .chapter-text {
    animation: none;
  }
}