/* 狐狸与兔子 · 温馨治愈水彩童话 */

:root {
  --fr-sky: #cfe8f2;
  --fr-mist: #e8f4ef;
  --fr-meadow: #d8ecd8;
  --fr-peach: #f5c4a0;
  --fr-fox: #e8925a;
  --fr-fox-deep: #c86f3a;
  --fr-ink: #3d3a36;
  --fr-ink-soft: #5c564e;
  --fr-muted: rgba(61, 58, 54, 0.68);
  --fr-paper: rgba(255, 252, 247, 0.82);
  --fr-paper-solid: #fffaf3;
  --fr-line: rgba(200, 160, 120, 0.35);
  --fr-glow: rgba(255, 210, 160, 0.55);
  --fr-radius: 1.25rem;
  --font-display: 'Songti SC', 'STSong', 'SimSun', 'Noto Serif SC', 'Source Han Serif SC', serif;
  --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', system-ui, sans-serif;
  --font-story: 'KaiTi', 'STKaiti', 'Kaiti SC', 'Songti SC', serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--fr-ink);
  font-family: var(--font-body);
  line-height: 1.75;
  background:
    radial-gradient(ellipse 90% 60% at 10% 0%, rgba(207, 232, 242, 0.9), transparent 55%),
    radial-gradient(ellipse 70% 50% at 90% 20%, rgba(245, 196, 160, 0.35), transparent 50%),
    linear-gradient(180deg, #eef7f4 0%, #f7f1e8 42%, #e8f0ea 100%);
  overflow-x: hidden;
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--fr-fox-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

#fr-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.fr-glow {
  position: fixed;
  z-index: 0;
  pointer-events: none;
  border-radius: 50%;
  filter: blur(72px);
  opacity: 0.5;
}

.fr-glow--tl {
  width: min(48vw, 22rem);
  height: min(48vw, 22rem);
  top: -6%;
  left: -4%;
  background: radial-gradient(circle, var(--fr-sky) 0%, transparent 70%);
}

.fr-glow--br {
  width: min(44vw, 20rem);
  height: min(44vw, 20rem);
  bottom: 8%;
  right: -6%;
  background: radial-gradient(circle, var(--fr-peach) 0%, transparent 72%);
}

/* —— 导航 —— */
.fr-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  background: color-mix(in srgb, var(--fr-paper-solid) 78%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--fr-line);
}

.fr-nav__brand {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--fr-ink);
  text-decoration: none;
  letter-spacing: 0.06em;
}

.fr-nav__links {
  display: none;
  gap: 1.15rem;
  font-size: 0.9rem;
}

.fr-nav__links a {
  color: var(--fr-ink-soft);
  text-decoration: none;
}

.fr-nav__links a:hover {
  color: var(--fr-fox-deep);
}

.fr-nav__back {
  font-size: 0.88rem;
  color: var(--fr-muted);
  text-decoration: none;
  white-space: nowrap;
}

.fr-nav__back:hover {
  color: var(--fr-fox-deep);
}

@media (min-width: 720px) {
  .fr-nav__links {
    display: flex;
  }
}

/* —— Hero：铺满视口，顶部对齐保留画面上半 —— */
.fr-hero {
  position: relative;
  z-index: 1;
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: end stretch;
  overflow: hidden;
  background: #cfe8f2;
}

.fr-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.fr-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.fr-hero__veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(40, 36, 30, 0.1) 0%, transparent 28%),
    linear-gradient(0deg, rgba(30, 28, 24, 0.72) 0%, rgba(30, 28, 24, 0.28) 40%, transparent 68%);
  pointer-events: none;
}

.fr-hero__content {
  position: relative;
  z-index: 2;
  padding: 5.5rem 1.5rem 3.25rem;
  max-width: 40rem;
  color: #fffaf3;
}

.fr-hero__brand {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 4.5vw, 2.35rem);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.35);
  animation: fr-rise 1s ease both;
}

.fr-hero__tag {
  margin: 0 0 0.5rem;
  font-size: 0.86rem;
  letter-spacing: 0.18em;
  opacity: 0.88;
  animation: fr-rise 1s 0.12s ease both;
}

.fr-hero__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.1rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.25;
  text-shadow: 0 2px 28px rgba(0, 0, 0, 0.4);
  animation: fr-rise 1s 0.2s ease both;
}

.fr-hero__lead {
  margin: 0 0 1.5rem;
  max-width: 34rem;
  font-family: var(--font-story);
  font-size: clamp(0.98rem, 2.2vw, 1.12rem);
  line-height: 1.9;
  opacity: 0.94;
  animation: fr-rise 1s 0.32s ease both;
}

.fr-hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 250, 243, 0.55);
  background: rgba(255, 250, 243, 0.16);
  color: #fffaf3;
  font-size: 0.95rem;
  text-decoration: none;
  backdrop-filter: blur(8px);
  transition: background 0.25s ease, transform 0.25s ease;
  animation: fr-rise 1s 0.42s ease both;
}

.fr-hero__cta:hover {
  background: rgba(255, 250, 243, 0.28);
  transform: translateY(-2px);
  color: #fffaf3;
}

.fr-hero__scroll {
  position: absolute;
  z-index: 2;
  left: 50%;
  bottom: 1.25rem;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  color: rgba(255, 250, 243, 0.75);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  pointer-events: none;
}

.fr-chevron {
  width: 0.7rem;
  height: 0.7rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  animation: fr-bob 1.6s ease-in-out infinite;
}

@keyframes fr-rise {
  from {
    opacity: 0;
    transform: translateY(1.1rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fr-bob {
  0%,
  100% {
    transform: rotate(45deg) translateY(0);
  }
  50% {
    transform: rotate(45deg) translateY(0.35rem);
  }
}

/* —— 主体区块 —— */
.fr-main {
  position: relative;
  z-index: 1;
}

.fr-section {
  padding: 4rem 1.25rem;
  max-width: 58rem;
  margin: 0 auto;
}

.fr-section--wide {
  max-width: 72rem;
}

.fr-h2 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.5vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--fr-ink);
}

.fr-h2-sub {
  margin: 0 0 1.75rem;
  color: var(--fr-muted);
  font-size: 0.95rem;
}

.fr-panel {
  padding: 1.5rem 1.35rem;
  border-radius: var(--fr-radius);
  background: var(--fr-paper);
  border: 1px solid var(--fr-line);
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 40px rgba(80, 60, 40, 0.06);
}

@media (min-width: 640px) {
  .fr-panel {
    padding: 2rem 2.25rem;
  }
}

.fr-intro p {
  margin: 0 0 1rem;
  font-family: var(--font-story);
  font-size: 1.05rem;
  color: var(--fr-ink-soft);
}

.fr-intro p:last-child {
  margin-bottom: 0;
}

.fr-mark {
  color: var(--fr-fox-deep);
  font-weight: 600;
}

/* —— 幕次目录 —— */
.fr-toc {
  margin: 0 0 2.25rem;
  padding: 1.15rem 1.1rem 1.25rem;
  border-radius: var(--fr-radius);
  background: var(--fr-paper);
  border: 1px solid var(--fr-line);
}

.fr-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.15rem 1.25rem;
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .fr-toc__list {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .fr-toc__list {
    grid-template-columns: 1fr 1fr 1fr 1fr;
  }
}

.fr-toc__item {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.45rem 0.15rem;
  color: var(--fr-ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.fr-toc__item:hover {
  color: var(--fr-fox-deep);
  border-bottom-color: rgba(200, 111, 58, 0.35);
}

.fr-toc__n {
  flex: 0 0 auto;
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--fr-fox);
  font-weight: 600;
}

.fr-toc__t {
  font-family: var(--font-display);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* —— 故事 ‖ 绘本交织（粘性绘本台 + 原文比例自适应） —— */
.fr-scenes {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.fr-scene {
  display: grid;
  gap: 1.25rem;
  scroll-margin-top: 4.5rem;
  padding: 2.5rem 0;
  border-top: 1px solid transparent;
  background:
    linear-gradient(90deg, transparent, rgba(200, 160, 120, 0.28), transparent) top / 56% 1px no-repeat;
}

.fr-scene:first-child {
  background: none;
  padding-top: 0.5rem;
}

@media (min-width: 900px) {
  .fr-scene {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 1.85rem;
    align-items: start;
    padding: 3rem 0;
  }

  .fr-scene--flip {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .fr-scene--flip .fr-scene__story {
    order: 2;
  }

  .fr-scene--flip .fr-scene__visual {
    order: 1;
  }

  /* 粘性绘本台：滚动读故事时画面停在视野里 */
  .fr-scene__visual {
    position: sticky;
    top: 4.75rem;
  }
}

.fr-scene__story {
  position: relative;
  padding: 1.5rem 1.35rem 1.6rem;
  border-radius: var(--fr-radius);
  background:
    linear-gradient(165deg, rgba(255, 252, 247, 0.94), rgba(255, 246, 236, 0.88));
  border: 1px solid var(--fr-line);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.7) inset,
    0 14px 40px rgba(80, 60, 40, 0.07);
}

@media (min-width: 640px) {
  .fr-scene__story {
    padding: 1.85rem 1.9rem 2rem;
  }
}

.fr-scene__head {
  margin-bottom: 1.05rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px dashed var(--fr-line);
}

.fr-scene__num {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--fr-fox-deep);
  font-weight: 600;
}

.fr-scene__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--fr-ink);
}

.fr-scene__prose {
  font-family: var(--font-story);
  font-size: clamp(1.02rem, 1.35vw, 1.1rem);
  line-height: 2.05;
  color: var(--fr-ink-soft);
}

.fr-scene__prose p {
  margin: 0 0 1.05rem;
  text-indent: 2em;
}

.fr-scene__prose p:last-child {
  margin-bottom: 0;
}

.fr-scene__visual {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.65rem 0.8rem;
  /* 行高只由图片决定，旁白不得把整行撑高 */
  align-items: start;
}

.fr-scene--flip .fr-scene__visual {
  grid-template-columns: auto minmax(0, 1fr);
}

.fr-scene--flip .fr-scene__figure {
  order: 2;
}

.fr-scene--flip .fr-scene__aside {
  order: 1;
}

.fr-scene__figure {
  margin: 0;
  border-radius: calc(var(--fr-radius) + 0.15rem);
  overflow: hidden;
  border: 1px solid var(--fr-line);
  background: transparent;
  line-height: 0;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.55) inset,
    0 18px 44px rgba(70, 55, 40, 0.12);
}

/* 按原图比例铺满宽度；高度随图片，不留底色空隙 */
.fr-scene__figure img {
  display: block;
  width: 100%;
  height: auto;
}

/*
 * 旁白侧栏：不参与撑高（height:0），再以 min-height:100% 贴齐图片高度；
 * 竖排文字在等高内自动换列（多行竖排）。
 */
.fr-scene__aside {
  box-sizing: border-box;
  height: 0;
  min-height: 100%;
  max-height: 100%;
  display: flex;
  justify-content: center;
  align-items: stretch;
  padding: 0.15rem 0.05rem;
  min-width: 2.25rem;
  overflow: visible;
}

.fr-vert {
  margin: 0;
  box-sizing: border-box;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-story);
  font-size: clamp(0.9rem, 1.35vw, 1.02rem);
  line-height: 1.9;
  letter-spacing: 0.18em;
  color: var(--fr-ink-soft);
  height: 100%;
  width: max-content;
  max-width: min(7.5rem, 22vw);
  overflow: hidden;
}

@media (max-width: 899px) {
  .fr-scene__visual {
    grid-template-columns: 1fr;
    position: static;
    align-items: stretch;
  }

  .fr-scene--flip .fr-scene__visual {
    grid-template-columns: 1fr;
  }

  .fr-scene--flip .fr-scene__figure,
  .fr-scene--flip .fr-scene__aside {
    order: unset;
  }

  .fr-scene__aside {
    height: auto;
    min-height: 0;
    max-height: none;
    justify-content: flex-start;
    padding: 0;
    min-width: 0;
  }

  .fr-vert {
    writing-mode: horizontal-tb;
    letter-spacing: 0.04em;
    height: auto;
    width: auto;
    max-width: none;
    overflow: visible;
    padding: 0.65rem 0.85rem;
    border-radius: 0.75rem;
    background: rgba(255, 252, 247, 0.92);
    border: 1px solid var(--fr-line);
    border-left: 3px solid var(--fr-fox);
    font-size: 0.96rem;
    line-height: 1.85;
  }
}

.fr-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--fr-line);
  background: var(--fr-paper-solid);
  color: var(--fr-ink);
  font: inherit;
  font-size: 0.9rem;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.fr-btn:hover {
  background: #fff3e6;
  border-color: rgba(200, 111, 58, 0.35);
  color: var(--fr-ink);
}

/* —— 页脚 —— */
.fr-footer {
  position: relative;
  z-index: 1;
  padding: 3rem 1.25rem 4rem;
  text-align: center;
}

.fr-footer__inner {
  max-width: 36rem;
  margin: 0 auto;
}

.fr-footer__brand {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.14em;
}

.fr-footer__text {
  margin: 0 0 1.25rem;
  color: var(--fr-muted);
  font-size: 0.92rem;
}

.fr-footer__wish {
  display: inline-block;
  margin-top: 0.65rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  color: var(--fr-fox-deep);
}

/* —— 显现 —— */
[data-reveal] {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .fr-hero__brand,
  .fr-hero__tag,
  .fr-hero__title,
  .fr-hero__lead,
  .fr-hero__cta,
  .fr-chevron,
  [data-reveal] {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}