/* ==========================================================================
   杰克英语绘本 Jack's English Picture Book
   风格：活泼童趣 · 明亮黄橙蓝绿
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 品牌主色 */
  --yellow:      #FFC93C;
  --yellow-deep: #FFB300;
  --orange:      #FF8A3D;
  --orange-deep: #F2661B;
  --blue:        #4FACFE;
  --blue-deep:   #1E7FD8;
  --green:       #3DD68C;
  --green-deep:  #1CA968;
  --coral:       #FF6B8A;
  --purple:      #9B7BFF;

  /* 中性色 */
  --ink:      #2B2A33;
  --ink-soft: #5A5866;
  --ink-mute: #8B8996;
  --line:     #EFEAF2;
  --cream:    #FFFCF5;
  --white:    #FFFFFF;

  /* 圆角 */
  --r-sm: 12px;
  --r-md: 20px;
  --r-lg: 28px;
  --r-xl: 40px;
  --r-pill: 999px;

  /* 阴影 */
  --sh-sm: 0 2px 10px rgba(43,42,51,.06);
  --sh-md: 0 8px 28px rgba(43,42,51,.09);
  --sh-lg: 0 18px 48px rgba(43,42,51,.13);
  --sh-color: 0 12px 32px rgba(255,169,60,.28);

  /* 容器 */
  --maxw: 1180px;

  /* 字体 */
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC",
          -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-round: "Baloo 2", "PingFang SC", "Microsoft YaHei", var(--font);
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--cream);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; font-size: 1rem; }

h1, h2, h3, h4 { line-height: 1.3; font-weight: 800; letter-spacing: -.01em; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px;
  border-radius: var(--r-pill);
  font-weight: 700; font-size: .97rem;
  transition: transform .22s cubic-bezier(.34,1.56,.64,1), box-shadow .22s, background .22s;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--yellow) 0%, var(--orange) 100%);
  color: #4A2E00;
  box-shadow: var(--sh-color);
}
.btn-primary:hover { transform: translateY(-3px) scale(1.03); box-shadow: 0 18px 40px rgba(255,138,61,.42); }
.btn-ghost {
  background: var(--white); color: var(--ink);
  border: 2px solid var(--line);
  box-shadow: var(--sh-sm);
}
.btn-ghost:hover { transform: translateY(-3px); border-color: var(--yellow); box-shadow: var(--sh-md); }
.btn-lg { padding: 16px 34px; font-size: 1.05rem; }
.btn-sm { padding: 9px 20px; font-size: .88rem; }
.btn-block { width: 100%; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,252,245,.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s, border-color .3s, background .3s;
}
.site-header.scrolled {
  background: rgba(255,255,255,.94);
  box-shadow: 0 4px 24px rgba(43,42,51,.08);
  border-bottom-color: var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; gap: 20px;
}

.logo { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.logo-mark {
  width: 42px; height: 42px; flex-shrink: 0;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--yellow), var(--orange));
  color: #fff; font-weight: 900; font-size: 1.4rem;
  border-radius: 14px;
  box-shadow: 0 6px 16px rgba(255,138,61,.35);
  font-family: var(--font-round);
}
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-text strong { font-size: 1.06rem; letter-spacing: .02em; }
.logo-text small { font-size: .67rem; color: var(--ink-mute); letter-spacing: .04em; }

.main-nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
  padding: 8px 13px; border-radius: var(--r-pill);
  font-size: .92rem; font-weight: 600; color: var(--ink-soft);
  transition: color .2s, background .2s;
  position: relative;
}
.nav-link:hover { color: var(--ink); background: rgba(255,201,60,.16); }
.nav-link.active { color: var(--orange-deep); background: rgba(255,138,61,.13); }
.nav-cta { margin-left: 10px; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span {
  display: block; width: 24px; height: 2.5px; border-radius: 2px;
  background: var(--ink); transition: transform .3s, opacity .3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

.scroll-progress {
  height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--yellow), var(--orange), var(--coral));
  transition: width .1s linear;
}

/* ---------- 首屏 Hero ---------- */
.hero {
  position: relative;
  padding: 148px 0 84px;
  overflow: hidden;
  background:
    radial-gradient(1100px 520px at 88% 4%, rgba(79,172,254,.16), transparent 62%),
    radial-gradient(900px 480px at 6% 92%, rgba(255,201,60,.24), transparent 62%),
    linear-gradient(180deg, #FFFDF8 0%, var(--cream) 100%);
}
.hero-bg-deco { position: absolute; inset: 0; pointer-events: none; z-index: 0; }
.blob { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .5; }
.blob-1 { width: 380px; height: 380px; background: rgba(255,201,60,.55); top: -120px; left: -100px; animation: float1 13s ease-in-out infinite; }
.blob-2 { width: 300px; height: 300px; background: rgba(61,214,140,.4); bottom: -80px; left: 42%; animation: float2 16s ease-in-out infinite; }
.blob-3 { width: 340px; height: 340px; background: rgba(155,123,255,.34); top: 40px; right: -110px; animation: float1 15s ease-in-out infinite reverse; }
@keyframes float1 { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(24px,-30px) scale(1.07); } }
@keyframes float2 { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(-28px,22px) scale(1.09); } }

.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.05fr .95fr;
  gap: 56px; align-items: center;
}
.hero-copy { max-width: 620px; }

.badge {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 18px; margin-bottom: 22px;
  background: var(--white); border: 2px solid rgba(255,201,60,.55);
  border-radius: var(--r-pill);
  font-size: .85rem; font-weight: 700; color: var(--orange-deep);
  box-shadow: var(--sh-sm);
}

.hero h1 {
  font-size: clamp(2.1rem, 4.6vw, 3.5rem);
  line-height: 1.2; margin-bottom: 20px; letter-spacing: -.02em;
}
.hero h1 .hl {
  position: relative; color: var(--orange-deep); white-space: nowrap;
}
.hero h1 .hl::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 4px; height: 12px;
  background: rgba(255,201,60,.5); border-radius: 6px; z-index: -1;
}
.hero-sub { font-size: 1.06rem; color: var(--ink-soft); margin-bottom: 32px; max-width: 560px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 40px; }

.hero-stats { display: flex; flex-wrap: wrap; gap: 34px; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong {
  font-size: 1.65rem; font-weight: 900; color: var(--orange-deep);
  font-family: var(--font-round); line-height: 1.1;
}
.hero-stats span { font-size: .84rem; color: var(--ink-mute); font-weight: 600; }

.hero-visual { position: relative; }
.hero-img-wrap {
  border-radius: var(--r-xl); overflow: hidden;
  box-shadow: var(--sh-lg);
  border: 6px solid var(--white);
  transform: rotate(1.2deg);
  transition: transform .5s cubic-bezier(.34,1.3,.64,1);
}
.hero-img-wrap:hover { transform: rotate(0deg) scale(1.02); }
.hero-img-wrap img { width: 100%; aspect-ratio: 3/2; object-fit: cover; }

/* 真实图书封面（竖版） */
.hero-img-cover { max-width: 420px; margin: 0 auto; transform: rotate(1.6deg); position: relative; }
.hero-img-cover img { aspect-ratio: 7/10; object-fit: cover; }
.cover-level-badge {
  position: absolute; top: 16px; right: -14px;
  padding: 8px 18px; border-radius: var(--r-pill);
  background: linear-gradient(135deg, var(--coral), var(--orange));
  color: #fff; font-weight: 900; font-size: .95rem; letter-spacing: .06em;
  box-shadow: 0 8px 20px rgba(255,107,138,.4);
  font-family: var(--font-round);
}
.hero-img-thumb {
  position: absolute; left: -26px; bottom: -20px; z-index: 2;
  width: 44%; max-width: 200px;
  background: var(--white); padding: 8px 8px 10px;
  border-radius: var(--r-md); box-shadow: var(--sh-lg);
  transform: rotate(-3deg);
  transition: transform .4s cubic-bezier(.34,1.3,.64,1);
}
.hero-img-thumb:hover { transform: rotate(0deg) scale(1.05); }
.hero-img-thumb img {
  width: 100%; aspect-ratio: 16/10; object-fit: cover;
  border-radius: var(--r-sm);
}
.hero-img-thumb small {
  display: block; text-align: center; margin-top: 7px;
  font-size: .72rem; font-weight: 800; color: var(--orange-deep);
}

.float-card {
  position: absolute; display: flex; align-items: center; gap: 11px;
  padding: 12px 18px; background: var(--white);
  border-radius: var(--r-md); box-shadow: var(--sh-md);
  animation: floaty 5s ease-in-out infinite;
}
.float-card strong { display: block; font-size: .92rem; }
.float-card small { font-size: .74rem; color: var(--ink-mute); }
.fc-icon { font-size: 1.5rem; }
.float-card-1 { top: 8%; left: -34px; animation-delay: 0s; }
.float-card-2 { bottom: 10%; right: -26px; animation-delay: 1.6s; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-13px); } }

.scroll-hint {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  width: 26px; height: 42px; border: 2.5px solid rgba(43,42,51,.22); border-radius: 14px;
  display: grid; place-items: start center; padding-top: 7px; z-index: 2;
}
.scroll-hint span {
  width: 4px; height: 8px; border-radius: 2px; background: var(--orange);
  animation: scrolldot 1.7s ease-in-out infinite;
}
@keyframes scrolldot { 0%,100% { transform: translateY(0); opacity: 1; } 60% { transform: translateY(14px); opacity: .2; } }

/* ---------- Section 通用 ---------- */
.section { padding: 96px 0; position: relative; }
.section-about  { background: var(--white); }
.section-disc   { background:
  radial-gradient(700px 400px at 92% 10%, rgba(79,172,254,.1), transparent 65%),
  var(--cream); }
.section-toy    { background: var(--white); }
.section-animation { background:
  radial-gradient(700px 420px at 8% 90%, rgba(255,201,60,.16), transparent 65%),
  var(--cream); }
.section-theme  { background: var(--white); }
.section-game   { background:
  radial-gradient(760px 440px at 90% 8%, rgba(61,214,140,.13), transparent 65%),
  linear-gradient(180deg, #F7FBF8 0%, #FFFCF5 100%); }
.section-showcase { background: var(--white); }
.section-contact { background:
  radial-gradient(900px 460px at 50% 0%, rgba(255,138,61,.14), transparent 68%),
  var(--cream); }

.section-head { max-width: 780px; margin: 0 auto 58px; text-align: center; }
.section-num {
  display: inline-block; font-family: var(--font-round);
  font-size: .9rem; font-weight: 900; letter-spacing: .16em;
  color: var(--orange); margin-bottom: 10px;
  padding: 4px 16px; border-radius: var(--r-pill);
  background: rgba(255,138,61,.12);
}
.section-title { font-size: clamp(1.5rem, 3.1vw, 2.25rem); margin-bottom: 16px; }
.section-desc { font-size: 1.03rem; color: var(--ink-soft); }

/* 滚动进场动画 */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s cubic-bezier(.22,1,.36,1); }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 01 简介 ---------- */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 44px; align-items: start; }
.about-main h3 { font-size: 1.42rem; margin-bottom: 16px; color: var(--ink); }
.about-main > p { color: var(--ink-soft); margin-bottom: 16px; }
.about-main strong { color: var(--orange-deep); }

.feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 30px; }
.feature-item {
  display: flex; gap: 14px; padding: 20px;
  background: var(--cream); border-radius: var(--r-md);
  border: 1.5px solid var(--line);
  transition: transform .28s, box-shadow .28s, border-color .28s, background .28s;
}
.feature-item:hover {
  transform: translateY(-5px); box-shadow: var(--sh-md);
  border-color: rgba(255,201,60,.55); background: var(--white);
}
.fi-icon {
  flex-shrink: 0; width: 46px; height: 46px; border-radius: 14px;
  display: grid; place-items: center; font-size: 1.4rem;
}
.fi-yellow { background: rgba(255,201,60,.22); }
.fi-blue   { background: rgba(79,172,254,.18); }
.fi-green  { background: rgba(61,214,140,.18); }
.fi-orange { background: rgba(255,138,61,.18); }
.feature-item h4 { font-size: 1rem; margin-bottom: 4px; }
.feature-item p { font-size: .87rem; color: var(--ink-mute); line-height: 1.65; }

.about-side { display: flex; flex-direction: column; gap: 20px; position: sticky; top: 96px; }
.side-card { padding: 28px; border-radius: var(--r-lg); }
.side-card-brand {
  background: linear-gradient(155deg, #FFF7E4 0%, #FFEFD6 100%);
  border: 2px solid rgba(255,201,60,.5);
  box-shadow: var(--sh-sm);
}
.side-card-brand h4 { font-size: 1.06rem; margin-bottom: 18px; color: var(--orange-deep); }
.info-list > div {
  display: flex; justify-content: space-between; gap: 14px;
  padding: 11px 0; border-bottom: 1px dashed rgba(242,102,27,.25);
}
.info-list > div:last-child { border-bottom: none; }
.info-list dt { font-size: .86rem; color: var(--ink-mute); font-weight: 600; flex-shrink: 0; }
.info-list dd { font-size: .88rem; font-weight: 700; text-align: right; }

.side-card-quote {
  background: linear-gradient(150deg, var(--blue) 0%, var(--blue-deep) 100%);
  color: #fff; box-shadow: 0 14px 34px rgba(30,127,216,.28);
}
.quote-text { font-size: 1.06rem; font-weight: 700; line-height: 1.6; margin-bottom: 12px; }
.quote-from { font-size: .82rem; opacity: .85; }

/* ---------- 02 光盘 ---------- */
.disc-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 54px; align-items: center; }
.disc-visual { position: relative; }
.disc-visual img {
  border-radius: var(--r-xl); box-shadow: var(--sh-lg);
  border: 6px solid var(--white); aspect-ratio: 1/1; object-fit: cover;
}
.isbn-badge {
  position: absolute; right: -18px; bottom: -22px;
  background: var(--white); padding: 16px 22px; border-radius: var(--r-md);
  box-shadow: var(--sh-lg); border: 2px solid rgba(79,172,254,.35);
  display: flex; flex-direction: column; gap: 2px;
  animation: floaty 6s ease-in-out infinite;
}
.isbn-label { font-size: .72rem; font-weight: 700; color: var(--blue-deep); letter-spacing: .1em; }
.isbn-value { font-family: var(--font-round); font-size: 1.08rem; font-weight: 900; color: var(--ink); }
.isbn-value em { color: var(--ink-mute); font-style: normal; }
.isbn-note { font-size: .76rem; color: var(--ink-mute); }

.disc-copy h3 { font-size: 1.42rem; margin-bottom: 16px; }
.disc-copy > p { color: var(--ink-soft); margin-bottom: 28px; }

.disc-features { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 26px; }
.disc-features li {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 18px; background: var(--white); border-radius: var(--r-md);
  border: 1.5px solid var(--line); box-shadow: var(--sh-sm);
  transition: transform .28s, box-shadow .28s, border-color .28s;
}
.disc-features li:hover { transform: translateY(-4px); box-shadow: var(--sh-md); border-color: rgba(79,172,254,.5); }
.df-icon { font-size: 1.4rem; flex-shrink: 0; line-height: 1.3; }
.disc-features h4 { font-size: .95rem; margin-bottom: 3px; }
.disc-features p { font-size: .84rem; color: var(--ink-mute); line-height: 1.6; }

.disc-note {
  padding: 18px 22px; border-radius: var(--r-md);
  background: rgba(255,201,60,.15);
  border-left: 5px solid var(--yellow);
  font-size: .89rem; color: var(--ink-soft);
}
.disc-note strong { color: var(--ink); }

/* ---------- 03 发声玩具 ---------- */
.toy-layout { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.toy-copy h3 { font-size: 1.42rem; margin-bottom: 16px; }
.toy-copy > p { color: var(--ink-soft); margin-bottom: 30px; }

.toy-steps { display: flex; flex-direction: column; gap: 16px; margin-bottom: 30px; }
.step {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 18px 20px; background: var(--cream);
  border-radius: var(--r-md); border: 1.5px solid var(--line);
  transition: transform .28s, box-shadow .28s;
}
.step:hover { transform: translateX(6px); box-shadow: var(--sh-sm); }
.step-num {
  flex-shrink: 0; width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--green), var(--green-deep));
  color: #fff; font-weight: 900; font-size: .95rem;
  font-family: var(--font-round);
  box-shadow: 0 5px 14px rgba(28,169,104,.3);
}
.step h4 { font-size: .99rem; margin-bottom: 2px; }
.step p { font-size: .86rem; color: var(--ink-mute); }

.toy-modes { display: flex; flex-wrap: wrap; gap: 10px; }
.mode-chip {
  padding: 8px 16px; border-radius: var(--r-pill);
  background: var(--white); border: 1.5px solid var(--line);
  font-size: .85rem; font-weight: 700; color: var(--ink-soft);
  box-shadow: var(--sh-sm); transition: all .25s;
}
.mode-chip:hover { border-color: var(--green); color: var(--green-deep); transform: translateY(-2px); }

.toy-visual { position: relative; }
.toy-visual img {
  border-radius: var(--r-xl); box-shadow: var(--sh-lg);
  border: 6px solid var(--white); aspect-ratio: 1/1; object-fit: cover;
}
.sound-wave {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  display: flex; align-items: flex-end; gap: 5px; height: 40px;
  padding: 10px 18px; background: rgba(255,255,255,.9);
  border-radius: var(--r-pill); box-shadow: var(--sh-md);
  backdrop-filter: blur(8px);
}
.sound-wave span {
  width: 5px; border-radius: 3px;
  background: linear-gradient(180deg, var(--green), var(--blue));
  animation: wave 1.1s ease-in-out infinite;
}
.sound-wave span:nth-child(1) { height: 10px; animation-delay: 0s; }
.sound-wave span:nth-child(2) { height: 22px; animation-delay: .15s; }
.sound-wave span:nth-child(3) { height: 30px; animation-delay: .3s; }
.sound-wave span:nth-child(4) { height: 20px; animation-delay: .45s; }
.sound-wave span:nth-child(5) { height: 12px; animation-delay: .6s; }
@keyframes wave { 0%,100% { transform: scaleY(.5); opacity: .6; } 50% { transform: scaleY(1.15); opacity: 1; } }

/* ---------- 04 动画视频 ---------- */
.animation-layout { display: grid; grid-template-columns: 1.25fr .75fr; gap: 44px; align-items: start; }
.anim-feature { position: relative; }
.video-frame {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  box-shadow: var(--sh-lg); border: 6px solid var(--white);
  background: #000;
}
.video-frame img { width: 100%; aspect-ratio: 16/10; object-fit: cover; opacity: .92; transition: transform .5s, opacity .4s; }
.video-frame:hover img { transform: scale(1.04); opacity: .78; }
.video-frame video {
  display: block; width: 100%; aspect-ratio: 16/9;
  object-fit: cover; background: #000;
}
.video-frame-sub { margin-top: 26px; }
.play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 76px; height: 76px; border-radius: 50%;
  display: grid; place-items: center;
  background: rgba(255,255,255,.95); color: var(--orange-deep);
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
  transition: transform .3s cubic-bezier(.34,1.56,.64,1), background .3s;
}
.play-btn svg { width: 34px; height: 34px; margin-left: 4px; }
.play-btn:hover { transform: translate(-50%,-50%) scale(1.12); background: var(--yellow); color: #fff; }
.play-btn::before {
  content: ""; position: absolute; inset: -10px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,.6); animation: pulse 2.2s ease-out infinite;
}
@keyframes pulse { 0% { transform: scale(.9); opacity: .9; } 100% { transform: scale(1.5); opacity: 0; } }

.video-meta {
  position: static; padding: 13px 20px;
  background: #14131A; color: #fff;
}
.video-meta h4 { font-size: 1.05rem; margin-bottom: 2px; }
.video-meta span { font-size: .8rem; opacity: .8; }
.video-hint { margin-top: 14px; font-size: .84rem; color: var(--ink-mute); }

.anim-list h3 { font-size: 1.28rem; margin-bottom: 20px; }
.anim-card {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 16px 18px; margin-bottom: 14px;
  background: var(--white); border-radius: var(--r-md);
  border: 1.5px solid var(--line); box-shadow: var(--sh-sm);
  transition: transform .28s, box-shadow .28s, border-color .28s;
}
.anim-card:hover { transform: translateY(-4px); box-shadow: var(--sh-md); border-color: rgba(155,123,255,.45); }
.ac-icon { flex-shrink: 0; width: 42px; height: 42px; border-radius: 13px; display: grid; place-items: center; font-size: 1.25rem; }
.ac-1 { background: rgba(255,138,61,.18); }
.ac-2 { background: rgba(79,172,254,.18); }
.ac-3 { background: rgba(255,201,60,.22); }
.ac-4 { background: rgba(61,214,140,.18); }
.anim-card h4 { font-size: .97rem; margin-bottom: 2px; }
.anim-card p { font-size: .84rem; color: var(--ink-mute); line-height: 1.6; }

.episode-strip { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
.ep-chip {
  padding: 7px 14px; border-radius: var(--r-pill);
  background: rgba(155,123,255,.12); color: #6B4FD8;
  font-size: .8rem; font-weight: 700;
  transition: all .24s;
}
.ep-chip:hover { background: var(--purple); color: #fff; transform: translateY(-2px); }

/* ---------- 05 主题曲 ---------- */
.theme-layout { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: center; }
.theme-visual { position: relative; }
.theme-visual img {
  border-radius: var(--r-xl); box-shadow: var(--sh-lg);
  border: 6px solid var(--white); aspect-ratio: 1/1; object-fit: cover;
}
.play-btn-lg { width: 92px; height: 92px; background: rgba(255,255,255,.94); color: var(--coral); }
.play-btn-lg svg { width: 42px; height: 42px; }

.audio-card {
  margin-top: 22px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding: 14px 18px; border-radius: var(--r-md);
  background: var(--white); box-shadow: var(--sh-md);
  border: 2px solid rgba(255,107,138,.22);
}
.np-bars { display: flex; align-items: flex-end; gap: 3px; height: 24px; flex-shrink: 0; }
.np-bars i { width: 4px; border-radius: 2px; background: var(--coral); animation: wave 1s ease-in-out infinite; }
.np-bars i:nth-child(1) { height: 10px; animation-delay: 0s; }
.np-bars i:nth-child(2) { height: 20px; animation-delay: .18s; }
.np-bars i:nth-child(3) { height: 14px; animation-delay: .36s; }
.np-bars i:nth-child(4) { height: 23px; animation-delay: .54s; }
.audio-info { flex: 1; min-width: 140px; }
.audio-info strong { display: block; font-size: .95rem; }
.audio-info small { font-size: .76rem; color: var(--ink-mute); }
.audio-card audio {
  flex-basis: 100%; height: 40px; border-radius: var(--r-pill);
}

.theme-copy h3 { font-size: 1.55rem; margin-bottom: 14px; color: var(--coral); font-family: var(--font-round); }
.theme-copy > p { color: var(--ink-soft); margin-bottom: 26px; }
.theme-copy strong { color: var(--orange-deep); }

.lyric-box {
  padding: 26px 28px; border-radius: var(--r-lg);
  background: linear-gradient(150deg, #FFF6F8 0%, #FFF1F4 100%);
  border: 2px dashed rgba(255,107,138,.42);
  margin-bottom: 28px;
}
.lyric-line {
  display: flex; justify-content: space-between; align-items: baseline; gap: 18px;
  padding: 9px 0; border-bottom: 1px dashed rgba(255,107,138,.2);
}
.lyric-line:last-of-type { border-bottom: none; }
.l-en { font-size: 1rem; font-weight: 800; color: var(--coral); font-family: var(--font-round); }
.l-cn { font-size: .84rem; color: var(--ink-mute); text-align: right; }
.lyric-note { margin-top: 14px; font-size: .76rem; color: var(--ink-mute); }

.theme-uses h4 { font-size: 1.02rem; margin-bottom: 12px; }
.theme-uses ul { display: flex; flex-direction: column; gap: 9px; }
.theme-uses li {
  font-size: .89rem; color: var(--ink-soft);
  padding-left: 22px; position: relative;
}
.theme-uses li::before {
  content: "♪"; position: absolute; left: 0; color: var(--coral); font-weight: 900;
}
.theme-uses strong { color: var(--ink); }

/* ---------- 06 游戏 ---------- */
/* 真实互动游戏（iframe 嵌入） */
.game-live {
  background: var(--white); border-radius: var(--r-xl);
  box-shadow: var(--sh-lg); border: 2px solid rgba(61,214,140,.28);
  overflow: hidden; margin-bottom: 44px;
}
.game-live-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 16px 24px; flex-wrap: wrap;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-deep) 100%);
  color: #fff;
}
.gl-title { display: flex; align-items: center; gap: 10px; font-size: 1.05rem; flex-wrap: wrap; }
.gl-tag {
  font-size: .74rem; font-weight: 800; padding: 3px 12px;
  background: rgba(255,255,255,.24); border-radius: var(--r-pill);
  letter-spacing: .04em;
}
.game-live-bar .btn-primary { background: #fff; color: var(--green-deep); box-shadow: 0 6px 16px rgba(0,0,0,.14); }
.game-live-bar .btn-primary:hover { background: #FFFDF7; box-shadow: 0 10px 22px rgba(0,0,0,.2); }

.game-live-body {
  padding: 18px; background: linear-gradient(180deg, #F7FBF8, #FFFCF5);
  display: flex; justify-content: center;
}
.game-live-body iframe {
  width: 100%; max-width: 620px; height: 660px;
  border: 0; border-radius: var(--r-lg);
  box-shadow: 0 16px 40px rgba(180,80,0,.22);
  background: #FFC15E;
}
.game-live-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  flex-wrap: wrap; padding: 15px 24px; border-top: 1.5px solid var(--line);
  background: var(--cream); font-size: .87rem; color: var(--ink-soft);
}
.gl-tip { color: var(--ink-mute); font-size: .82rem; }

/* 更多玩法 */
.game-extra-title { font-size: 1.2rem; margin-bottom: 20px; text-align: center; }
.game-extra-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.game-extra-grid .gt-dot {
  width: 10px; height: 10px; border-radius: 50%; background: #fff;
  box-shadow: 0 0 0 4px rgba(255,255,255,.3);
  animation: pulseDot 1.8s ease-in-out infinite;
}
@keyframes pulseDot { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

.mini-game {
  display: flex; gap: 13px; align-items: flex-start;
  padding: 16px; margin-bottom: 12px;
  background: var(--white); border-radius: var(--r-md);
  border: 1.5px solid var(--line); box-shadow: var(--sh-sm);
  transition: transform .26s, box-shadow .26s, border-color .26s;
}
.mini-game:hover { transform: translateX(5px); box-shadow: var(--sh-md); border-color: rgba(61,214,140,.45); }
.mg-emoji { font-size: 1.5rem; flex-shrink: 0; }
.mini-game h4 { font-size: .95rem; margin-bottom: 2px; }
.mini-game p { font-size: .83rem; color: var(--ink-mute); line-height: 1.6; }

/* ---------- 07 宝宝展示 ---------- */
.showcase-hero {
  display: grid; grid-template-columns: 1fr 1.05fr; gap: 46px;
  align-items: center; margin-bottom: 56px;
  padding: 34px; border-radius: var(--r-xl);
  background: linear-gradient(150deg, #FFF8EE 0%, #FFF3F5 55%, #F3F9FF 100%);
  border: 2px solid rgba(255,201,60,.35);
}
.showcase-hero img {
  border-radius: var(--r-lg); box-shadow: var(--sh-lg);
  border: 6px solid var(--white); aspect-ratio: 1/1; object-fit: cover;
}
.showcase-hero-copy h3 { font-size: 1.45rem; margin-bottom: 14px; }
.showcase-hero-copy > p { color: var(--ink-soft); margin-bottom: 26px; }

.progress-track { display: flex; flex-direction: column; gap: 0; position: relative; }
.pt-item { display: flex; gap: 16px; align-items: flex-start; padding-bottom: 20px; position: relative; }
.pt-item:last-child { padding-bottom: 0; }
.pt-item::before {
  content: ""; position: absolute; left: 38px; top: 28px; bottom: 0; width: 2px;
  background: linear-gradient(180deg, rgba(255,138,61,.4), rgba(79,172,254,.4));
}
.pt-item:last-child::before { display: none; }
.pt-badge {
  flex-shrink: 0; padding: 6px 14px; border-radius: var(--r-pill);
  background: var(--white); color: var(--orange-deep);
  font-size: .8rem; font-weight: 800; box-shadow: var(--sh-sm);
  border: 1.5px solid rgba(255,138,61,.3); white-space: nowrap;
  z-index: 1;
}
.pt-item p { font-size: .9rem; color: var(--ink-soft); padding-top: 5px; }

.gallery {
  display: grid; grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 200px; gap: 18px; margin-bottom: 56px;
}
.gallery-item {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  box-shadow: var(--sh-md); background: var(--white);
}
.gallery-item.g-large { grid-column: span 2; grid-row: span 2; }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .55s cubic-bezier(.22,1,.36,1); }
.gallery-item:hover img { transform: scale(1.09); }
.gallery-item figcaption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 20px 22px;
  background: linear-gradient(0deg, rgba(0,0,0,.76), rgba(0,0,0,.28) 62%, transparent);
  color: #fff; transform: translateY(6px); transition: transform .4s;
}
.gallery-item:hover figcaption { transform: none; }
.gallery-item figcaption strong { display: block; font-size: 1rem; margin-bottom: 2px; }
.gallery-item figcaption span { font-size: .8rem; opacity: .88; }

.testimonials { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.testimonial {
  padding: 28px; border-radius: var(--r-lg);
  background: var(--cream); border: 1.5px solid var(--line);
  display: flex; flex-direction: column; justify-content: space-between; gap: 18px;
  transition: transform .3s, box-shadow .3s, border-color .3s, background .3s;
}
.testimonial:hover { transform: translateY(-6px); box-shadow: var(--sh-md); border-color: rgba(255,201,60,.55); background: var(--white); }
.t-text { font-size: .93rem; color: var(--ink-soft); line-height: 1.75; font-style: italic; }
.t-author { display: flex; align-items: center; gap: 12px; }
.t-avatar {
  width: 44px; height: 44px; border-radius: 50%; flex-shrink: 0;
  display: grid; place-items: center; font-size: 1.3rem;
  background: linear-gradient(135deg, rgba(255,201,60,.35), rgba(255,138,61,.3));
}
.t-author strong { display: block; font-size: .92rem; }
.t-author small { font-size: .78rem; color: var(--ink-mute); }

/* ---------- 联系 ---------- */
.contact-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 54px; align-items: center; }
.contact-copy h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); margin-bottom: 14px; }
.contact-copy > p { color: var(--ink-soft); margin-bottom: 28px; }
.contact-list { display: flex; flex-direction: column; gap: 14px; }
.contact-list li {
  display: flex; align-items: center; gap: 12px;
  font-size: .95rem; color: var(--ink-soft); font-weight: 600;
}
.contact-list span {
  width: 40px; height: 40px; border-radius: 13px; flex-shrink: 0;
  display: grid; place-items: center; font-size: 1.15rem;
  background: var(--white); box-shadow: var(--sh-sm);
}

.contact-card {
  padding: 34px; border-radius: var(--r-xl);
  background: var(--white); box-shadow: var(--sh-lg);
  border: 2px solid rgba(255,201,60,.3);
}
.contact-card h3 { font-size: 1.22rem; margin-bottom: 22px; }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.contact-form label { display: flex; flex-direction: column; gap: 7px; }
.contact-form label span { font-size: .86rem; font-weight: 700; color: var(--ink-soft); }
.contact-form input, .contact-form textarea {
  padding: 13px 16px; border-radius: var(--r-sm);
  border: 1.8px solid var(--line); background: var(--cream);
  transition: border-color .24s, box-shadow .24s, background .24s;
  resize: vertical;
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--yellow); background: var(--white);
  box-shadow: 0 0 0 4px rgba(255,201,60,.18);
}
.form-note { font-size: .85rem; min-height: 1.3em; font-weight: 700; }
.form-note.ok { color: var(--green-deep); }
.form-note.err { color: var(--coral); }
.contact-form label span i { color: var(--coral); font-style: normal; }
.form-privacy { font-size: .76rem; color: var(--ink-mute); margin-top: -8px; }
.contact-form button[disabled] { opacity: .6; cursor: not-allowed; }

/* ---------- 页脚 ---------- */
.site-footer { background: #2B2A33; color: rgba(255,255,255,.72); }
.footer-inner {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px; padding: 62px 24px 46px;
}
.logo-footer .logo-text strong { color: #fff; }
.logo-footer .logo-text small { color: rgba(255,255,255,.5); }
.footer-brand > p { margin-top: 18px; font-size: .9rem; max-width: 260px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links h4 { color: #fff; font-size: .95rem; margin-bottom: 6px; }
.footer-links a, .footer-links span { font-size: .87rem; transition: color .22s, transform .22s; }
.footer-links a:hover { color: var(--yellow); transform: translateX(3px); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 22px 0; }
.footer-bottom .container {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  font-size: .82rem; color: rgba(255,255,255,.5);
}
/* 备案号（管局要求：首页底部展示并链接至工信部备案官网） */
.footer-icp { display: inline-flex; align-items: center; gap: 8px; }
.footer-icp a {
  color: rgba(255,255,255,.6); text-decoration: none;
  border-bottom: 1px solid transparent; transition: color .2s, border-color .2s;
}
.footer-icp a:hover { color: var(--yellow); border-bottom-color: var(--yellow); }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 48px; height: 48px; border-radius: 50%;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--yellow), var(--orange));
  color: #fff; font-size: 1.25rem; font-weight: 900;
  box-shadow: var(--sh-color);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: opacity .3s, visibility .3s, transform .3s;
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { transform: translateY(-4px) scale(1.07); }

/* ==========================================================================
   板块全屏浏览（每个板块右上角的「全屏」按钮）
   ========================================================================== */
.fs-btn {
  position: absolute; top: 34px; right: 24px; z-index: 6;
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 15px; border-radius: var(--r-pill);
  border: 1.5px solid var(--line); background: rgba(255,255,255,.92);
  font-size: .78rem; font-weight: 700; color: var(--ink-soft);
  cursor: pointer; transition: .24s; white-space: nowrap;
  box-shadow: 0 2px 10px rgba(120,105,80,.07);
  backdrop-filter: blur(6px);
}
.fs-btn:hover { border-color: var(--orange); color: var(--orange-deep); background: #FFF9F0; transform: translateY(-1px); }
.fs-btn svg { width: 13px; height: 13px; flex-shrink: 0; }
.fs-btn.fs-on { border-color: var(--orange); color: var(--orange-deep); background: #FFF3E0; }
/* 宽屏时让按钮对齐内容容器右边缘，而不是贴屏幕边 */
@supports (right: max(1px, 2px)) {
  .fs-btn { right: calc(max(20px, (100% - 1180px) / 2 + 6px)); }
}

/* 真·全屏时（浏览器 Fullscreen API） */
.section:fullscreen,
.section:-webkit-full-screen,
.section:-moz-full-screen,
.section:-ms-fullscreen {
  height: 100vh; overflow-y: auto; padding: 56px 0 64px;
  background: var(--cream);
}
.section:fullscreen::backdrop { background: #FFF8E7; }
.section:fullscreen .container { max-width: 1180px; }
.section:fullscreen .reveal,
.section:-webkit-full-screen .reveal { opacity: 1; transform: none; }
.section:fullscreen .fs-btn { position: fixed; top: 16px; right: 20px; box-shadow: var(--sh-md); }

/* 兜底「伪全屏」（浏览器不允许全屏时使用，如内嵌预览框） */
.section.fs-pseudo {
  position: fixed; inset: 0; z-index: 9999;
  overflow-y: auto; background: var(--cream);
  padding: 56px 0 64px; margin: 0; border-radius: 0;
}
.section.fs-pseudo .container { max-width: 1180px; }
.section.fs-pseudo .reveal { opacity: 1; transform: none; }
.section.fs-pseudo .fs-btn { position: fixed; top: 16px; right: 20px; box-shadow: var(--sh-md); }
body.fs-lock { overflow: hidden; }

/* 全屏时让视频 / 游戏用足屏幕 */
.section:fullscreen .video-frame video,
.section.fs-pseudo .video-frame video { max-height: 74vh; margin: 0 auto; display: block; }
.section:fullscreen .game-live,
.section.fs-pseudo .game-live { max-width: 680px; margin-left: auto; margin-right: auto; }
.section:fullscreen .game-live-body iframe,
.section.fs-pseudo .game-live-body iframe { height: calc(100vh - 230px); min-height: 520px; }

/* ==========================================================================
   核心价值 · 适用场景（首页开头，01 简介之前）
   ========================================================================== */
.section-uses {
  background:
    radial-gradient(760px 420px at 8% 0%, rgba(255,206,84,.16), transparent 62%),
    radial-gradient(700px 420px at 96% 100%, rgba(79,172,254,.14), transparent 62%),
    var(--white);
}
.section-uses .section-desc { max-width: 620px; margin: 0 auto; }

/* 首屏场景小标签 */
.hero-for { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; margin-bottom: 26px; }
.hero-for .hf-label {
  font-size: .78rem; font-weight: 800; color: var(--ink-mute);
  letter-spacing: .04em;
}
.hero-for .hf-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: var(--r-pill);
  font-size: .82rem; font-weight: 700; color: var(--ink);
  background: rgba(255,255,255,.86); border: 1.5px solid var(--line);
  box-shadow: 0 2px 8px rgba(120,105,80,.05);
}
.hero-for .hf-chip.hf-home { border-color: rgba(255,138,61,.34); background: #FFF6EC; color: #B1550F; }
.hero-for .hf-chip.hf-school { border-color: rgba(79,140,254,.32); background: #EFF5FF; color: #2B5FBF; }

/* 两栏场景卡 */
.uses-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
.use-card {
  background: var(--white); border-radius: var(--r-lg);
  border: 1.5px solid var(--line); padding: 32px 30px 30px;
  box-shadow: 0 10px 34px rgba(140,124,96,.08);
  transition: transform .3s, box-shadow .3s, border-color .3s;
  display: flex; flex-direction: column;
}
.use-card:hover { transform: translateY(-4px); box-shadow: 0 18px 46px rgba(140,124,96,.14); }
.use-card.use-home { border-top: 5px solid var(--orange); }
.use-card.use-school { border-top: 5px solid #5B9BFF; }

.use-head { display: flex; gap: 15px; align-items: flex-start; margin-bottom: 24px; }
.use-emoji {
  width: 54px; height: 54px; flex-shrink: 0; border-radius: 16px;
  display: grid; place-items: center; font-size: 1.7rem;
  background: linear-gradient(135deg, #FFF4D6, #FFE6B8);
}
.use-school .use-emoji { background: linear-gradient(135deg, #E7F0FF, #D6E6FF); }
.use-head h3 { font-size: 1.42rem; margin-bottom: 6px; }
.use-sub { font-size: .92rem; color: var(--ink-soft); }

.use-points { list-style: none; display: flex; flex-direction: column; gap: 15px; margin-bottom: 22px; }
.use-points li { display: flex; gap: 13px; align-items: flex-start; }
.use-points .up-icon {
  width: 34px; height: 34px; flex-shrink: 0; border-radius: 11px;
  display: grid; place-items: center; font-size: 1.02rem;
  background: var(--cream); border: 1.5px solid var(--line);
}
.use-points strong { display: block; font-size: .98rem; margin-bottom: 3px; }
.use-points p { font-size: .88rem; color: var(--ink-soft); }

.use-quote {
  margin-top: auto; padding: 15px 18px; border-radius: var(--r-md);
  font-size: 1rem; font-weight: 800; line-height: 1.55;
  background: linear-gradient(135deg, #FFF8E7, #FFF1D6);
  border-left: 4px solid var(--yellow);
  color: var(--ink);
}
.use-school .use-quote {
  background: linear-gradient(135deg, #F1F7FF, #E7F0FF);
  border-left-color: #5B9BFF;
}

/* 四种能力 */
.ability-box { margin-top: 24px; padding-top: 22px; border-top: 1.5px dashed var(--line); }
.ability-box h4 { font-size: 1.02rem; margin-bottom: 16px; color: var(--ink); }
.ability-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }
.ability {
  background: var(--cream); border: 1.5px solid var(--line);
  border-radius: var(--r-md); padding: 16px 15px;
  transition: transform .26s, border-color .26s, background .26s;
}
.ability:hover { transform: translateY(-3px); border-color: var(--yellow); background: #FFFCF4; }
.ability b {
  display: inline-block; font-family: var(--font-round); font-size: .74rem;
  font-weight: 900; letter-spacing: .1em; color: var(--orange);
  padding: 2px 9px; border-radius: var(--r-pill);
  background: rgba(255,138,61,.13); margin-bottom: 9px;
}
.ability h5 { font-size: 1rem; margin-bottom: 5px; }
.ability p { font-size: .82rem; color: var(--ink-soft); line-height: 1.6; }

/* 园所标签 */
.school-tags { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
.school-tags span {
  font-size: .8rem; font-weight: 700; color: #2B5FBF;
  padding: 7px 14px; border-radius: var(--r-pill);
  background: #EFF5FF; border: 1.5px solid rgba(79,140,254,.24);
}
.school-note { margin-top: 18px; font-size: .84rem; color: var(--ink-mute); }
.use-school .use-points { margin-bottom: 4px; }

/* 底部一句话总结 */
.uses-summary {
  margin-top: 30px; text-align: center;
  font-size: .95rem; font-weight: 700; color: var(--ink-soft);
}
.uses-summary span {
  display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: center;
  padding: 13px 26px; border-radius: var(--r-pill);
  background: var(--white); border: 1.5px solid var(--line);
  box-shadow: 0 6px 20px rgba(140,124,96,.07);
}
.uses-summary i { font-style: normal; color: var(--orange); }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .hero-inner { gap: 40px; }
  .about-grid { grid-template-columns: 1fr; }
  .about-side { position: static; flex-direction: row; }
  .about-side .side-card { flex: 1; }
  .animation-layout { grid-template-columns: 1fr; }
  .game-extra-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed; top: 72px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 4px;
    padding: 18px 24px 26px;
    background: rgba(255,255,255,.98);
    backdrop-filter: blur(16px);
    box-shadow: 0 18px 40px rgba(43,42,51,.13);
    border-bottom: 1px solid var(--line);
    transform: translateY(-12px); opacity: 0; visibility: hidden;
    transition: transform .3s, opacity .3s, visibility .3s;
    max-height: calc(100vh - 72px); overflow-y: auto;
  }
  .main-nav.open { transform: none; opacity: 1; visibility: visible; }
  .nav-link { padding: 13px 16px; border-radius: var(--r-sm); font-size: 1rem; }
  .nav-cta { margin: 10px 0 0; }

  .hero { padding: 124px 0 70px; }
  .hero-inner { grid-template-columns: 1fr; gap: 46px; }
  .hero-visual { max-width: 560px; margin: 0 auto; width: 100%; }
  .float-card-1 { left: 0; }
  .float-card-2 { right: 0; }
  .hero-copy { max-width: none; }

  .disc-layout { grid-template-columns: 1fr; gap: 44px; }
  .disc-visual { max-width: 460px; margin: 0 auto; width: 100%; }
  .isbn-badge { right: 0; bottom: -18px; }

  .toy-layout { grid-template-columns: 1fr; gap: 42px; }
  .toy-visual { max-width: 460px; margin: 0 auto; width: 100%; }

  .theme-layout { grid-template-columns: 1fr; gap: 42px; }
  .theme-visual { max-width: 480px; margin: 0 auto; width: 100%; }

  .showcase-hero { grid-template-columns: 1fr; gap: 30px; padding: 26px; }
  .showcase-hero img { max-width: 440px; margin: 0 auto; width: 100%; }

  .contact-inner { grid-template-columns: 1fr; gap: 40px; }

  .section { padding: 74px 0; }
  .gallery { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 190px; }
  .testimonials { grid-template-columns: 1fr; }
  .game-extra-grid { grid-template-columns: repeat(2, 1fr); }
  .game-live-body iframe { height: 620px; }
}

@media (max-width: 620px) {
  .container { padding: 0 18px; }
  .section { padding: 60px 0; }
  .section-head { margin-bottom: 40px; }

  .hero { padding: 108px 0 58px; }
  .hero h1 { font-size: 1.95rem; }
  .hero-sub { font-size: .97rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { gap: 22px; }
  .hero-stats strong { font-size: 1.4rem; }
  .hero-img-cover { max-width: 330px; }
  .hero-img-thumb { left: -6px; bottom: -16px; }
  .float-card { padding: 9px 13px; }
  .float-card strong { font-size: .82rem; }
  .float-card small { font-size: .68rem; }
  .fc-icon { font-size: 1.25rem; }
  .float-card-1 { top: 4%; }
  .float-card-2 { bottom: 5%; }
  .scroll-hint { display: none; }

  .feature-list, .disc-features { grid-template-columns: 1fr; }
  .about-side { flex-direction: column; }

  .gallery { grid-template-columns: 1fr; grid-auto-rows: 210px; }
  .gallery-item.g-large { grid-column: span 1; grid-row: span 1; }


  .game-live-body { padding: 12px; }
  .game-live-body iframe { height: 600px; }
  .game-live-bar { padding: 14px 16px; }
  .game-live-bar .btn { width: 100%; }
  .game-live-foot { flex-direction: column; align-items: flex-start; padding: 13px 16px; }
  .game-extra-grid { grid-template-columns: 1fr; }

  .footer-inner { grid-template-columns: 1fr; gap: 30px; padding: 44px 18px 34px; }
  .footer-bottom .container { flex-direction: column; text-align: center; }

  .contact-card { padding: 24px; }
  .lyric-box { padding: 20px 18px; }
  .lyric-line { flex-direction: column; gap: 2px; }
  .l-cn { text-align: left; }
  .back-top { right: 16px; bottom: 16px; width: 42px; height: 42px; }
  .play-btn { width: 62px; height: 62px; }
  .play-btn svg { width: 28px; height: 28px; }
}

/* ---------- 无障碍 / 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 核心价值板块 与 全屏按钮 的响应式 ---------- */
@media (max-width: 1080px) {
  .uses-grid { gap: 22px; }
  .use-card { padding: 26px 24px; }
}
@media (max-width: 900px) {
  .uses-grid { grid-template-columns: 1fr; }
  .ability-grid { grid-template-columns: 1fr 1fr; }
  .fs-btn { top: 22px; right: 16px; }
  .section:fullscreen .fs-btn,
  .section.fs-pseudo .fs-btn { top: 12px; right: 12px; }
}
@media (max-width: 620px) {
  .ability-grid { grid-template-columns: 1fr; }
  .use-head h3 { font-size: 1.24rem; }
  .use-card { padding: 22px 18px; }
  .use-quote { font-size: .94rem; padding: 13px 15px; }
  .fs-btn { padding: 7px 11px; top: 16px; right: 12px; }
  .fs-btn .fs-text { display: none; }
  .hero-for .hf-chip { font-size: .78rem; padding: 6px 11px; }
  .section:fullscreen,
  .section.fs-pseudo { padding: 44px 0 50px; }
  .section:fullscreen .game-live-body iframe,
  .section.fs-pseudo .game-live-body iframe { height: calc(100vh - 260px); min-height: 420px; }
}