/* ============ 主题变量（取自 logo 粉色） ============ */
:root{
  --pink:        #FF6BAE;
  --pink-deep:   #E8447F;
  --pink-dark:   #C9306A;
  --pink-light:  #FFD3E6;
  --pink-soft:   #FFF4F9;
  --pink-glow:   rgba(255,107,174,.35);
  --text:        #2B2430;
  --muted:       #7E7280;
  --white:       #FFFFFF;
  --radius:      20px;
  --radius-sm:   14px;
  --shadow:      0 12px 34px rgba(255,107,174,.20);
  --shadow-lg:   0 24px 60px rgba(232,68,127,.28);
  --nav-h:       72px;
}

/* ============ 基础 ============ */
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif;
  color:var(--text);
  background:var(--white);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{text-decoration:none;color:inherit;}
ul{list-style:none;}
.container{width:min(1180px,92%);margin:0 auto;}

/* ============ 通用按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 30px;border-radius:999px;border:none;cursor:pointer;
  font-size:16px;font-weight:600;font-family:inherit;
  transition:transform .25s cubic-bezier(.2,.8,.3,1),box-shadow .25s,background .25s;
  white-space:nowrap;
}
.btn-primary{
  color:#fff;
  background:linear-gradient(135deg,#FF8FC4 0%,var(--pink) 45%,var(--pink-deep) 100%);
  box-shadow:0 10px 26px var(--pink-glow);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 16px 36px rgba(232,68,127,.42);}
.btn-primary:active{transform:translateY(-1px);}
.btn-ghost{
  color:var(--pink-deep);background:#fff;
  border:2px solid var(--pink-light);
}
.btn-ghost:hover{background:var(--pink-soft);border-color:var(--pink);transform:translateY(-3px);}
.btn-lg{padding:17px 40px;font-size:17px;}
.btn-white{background:#fff;color:var(--pink-deep);box-shadow:0 12px 30px rgba(0,0,0,.18);}
.btn-white:hover{transform:translateY(-3px);box-shadow:0 18px 40px rgba(0,0,0,.26);}
.icon-dl{width:19px;height:19px;flex-shrink:0;}

/* ============ 顶部导航 ============ */
.nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:100;
  display:flex;align-items:center;
  background:rgba(255,255,255,.72);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  transition:box-shadow .3s,background .3s;
}
.nav.scrolled{
  background:rgba(255,255,255,.94);
  box-shadow:0 6px 24px rgba(255,107,174,.14);
}
.nav-inner{
  width:min(1180px,92%);margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
/* Logo */
.brand{display:flex;align-items:center;gap:11px;flex-shrink:0;}
.brand img{
  width:44px;height:44px;border-radius:13px;
  box-shadow:0 6px 16px var(--pink-glow);
  transition:transform .3s;
}
.brand:hover img{transform:rotate(-6deg) scale(1.06);}
.brand-name{
  font-size:21px;font-weight:800;letter-spacing:.5px;
  background:linear-gradient(135deg,var(--pink) 0%,var(--pink-deep) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
/* 菜单 */
.nav-menu{display:flex;align-items:center;gap:6px;}
.nav-menu a{
  position:relative;padding:9px 16px;border-radius:999px;
  font-size:15.5px;font-weight:500;color:var(--muted);
  transition:color .25s,background .25s;
}
.nav-menu a:hover{color:var(--pink-deep);background:var(--pink-soft);}
.nav-menu a.active{color:var(--pink-deep);font-weight:700;}
.nav-menu a.active::after{
  content:"";position:absolute;left:50%;bottom:2px;transform:translateX(-50%);
  width:18px;height:3px;border-radius:3px;background:var(--pink);
}
.nav-right{display:flex;align-items:center;gap:12px;}
.nav .btn{padding:11px 24px;font-size:15px;}

/* 下载按钮的角标 */
.btn-download{position:relative;}
.badge{
  position:absolute;
  top:-6px;
  right:-6px;
  display:flex;
  align-items:center;
  gap:2px;
  padding:4px 6px;
  background:var(--pink-deep);
  color:#fff;
  font-size:11px;
  font-weight:700;
  line-height:1;
  border-radius:20px;
  box-shadow:0 2px 8px rgba(232,68,127,.45);
  pointer-events:none;
  animation:pulse-badge 2s infinite;
}
.badge svg{
  width:10px;
  height:10px;
  fill:#fff;
}
@keyframes pulse-badge{
  0%{transform:scale(1);}
  50%{transform:scale(1.08);}
  100%{transform:scale(1);}
}

/* 汉堡按钮 */
.hamburger{
  display:none;width:44px;height:44px;border:none;background:var(--pink-soft);
  border-radius:12px;cursor:pointer;position:relative;
}
.hamburger span{
  position:absolute;left:12px;width:20px;height:2px;border-radius:2px;
  background:var(--pink-deep);transition:.3s;
}
.hamburger span:nth-child(1){top:15px;}
.hamburger span:nth-child(2){top:21px;}
.hamburger span:nth-child(3){top:27px;}
.hamburger.open span:nth-child(1){top:21px;transform:rotate(45deg);}
.hamburger.open span:nth-child(2){opacity:0;}
.hamburger.open span:nth-child(3){top:21px;transform:rotate(-45deg);}

/* ============ 页面头部 ============ */
.page-hero{
  padding:calc(var(--nav-h) + 64px) 0 48px;
  text-align:center;
  background:
    radial-gradient(800px 420px at 50% 0%, #FFE3F0 0%, rgba(255,227,240,0) 70%),
    linear-gradient(180deg,#FFF9FC 0%,#FFFFFF 100%);
}
.section-tag{
  display:inline-block;padding:6px 16px;border-radius:999px;
  background:var(--pink-soft);color:var(--pink-deep);
  font-size:13px;font-weight:700;letter-spacing:1px;margin-bottom:16px;
}
.page-hero h1{
  font-size:clamp(28px,3.6vw,44px);font-weight:900;letter-spacing:-.6px;
  line-height:1.25;margin-bottom:14px;
}
.page-hero h1 .grad{
  background:linear-gradient(120deg,var(--pink) 0%,var(--pink-deep) 60%,#FF9CCB 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.page-hero p{color:var(--muted);font-size:16px;max-width:520px;margin:0 auto;}

/* ============ 筛选栏 ============ */
.filter-section{padding:0 0 60px;}
.filter-bar{
  display:flex;flex-wrap:wrap;gap:10px;justify-content:center;
  margin-bottom:20px;
}
.filter-chip{
  padding:10px 26px;border-radius:999px;
  border:1.5px solid var(--pink-light);
  background:#fff;color:var(--muted);
  font-size:14.5px;font-weight:600;
  cursor:pointer;font-family:inherit;
  transition:all .25s cubic-bezier(.2,.8,.3,1);
}
.filter-chip:hover{border-color:var(--pink);color:var(--pink-deep);}
.filter-chip.active{
  background:linear-gradient(135deg,var(--pink),var(--pink-deep));
  color:#fff;border-color:transparent;
  box-shadow:0 8px 22px var(--pink-glow);
}

/* 子分类 */
.sub-filter{
  display:none;flex-wrap:wrap;gap:8px;justify-content:center;
  max-width:760px;margin:0 auto;
  padding:18px;
  background:var(--pink-soft);
  border:1px dashed var(--pink-light);
  border-radius:18px;
  animation:fadeIn .35s ease;
}
.sub-filter.show{display:flex;}
@keyframes fadeIn{
  from{opacity:0;transform:translateY(-8px);}
  to{opacity:1;transform:translateY(0);}
}
.sub-chip{
  padding:7px 18px;border-radius:999px;border:none;
  background:#fff;color:var(--pink-deep);
  font-size:13.5px;font-weight:600;
  cursor:pointer;font-family:inherit;
  transition:all .25s;
  box-shadow:0 2px 8px rgba(255,107,174,.12);
}
.sub-chip:hover{background:var(--pink-light);transform:translateY(-2px);}
.sub-chip.active{
  background:var(--pink-deep);color:#fff;
  box-shadow:0 6px 16px rgba(232,68,127,.35);
}

/* ============ 视频网格 ============ */
.video-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(240px,1fr));
  gap:24px;
  padding-bottom:20px;
}
.video-card{
  display:block;
  background:#fff;
  border-radius:18px;
  overflow:hidden;
  border:1px solid #FFE3F0;
  box-shadow:0 8px 24px rgba(255,107,174,.10);
  transition:transform .35s cubic-bezier(.2,.8,.3,1),box-shadow .35s,border-color .35s;
  cursor:pointer;
}
.video-card:hover{
  transform:translateY(-8px);
  border-color:var(--pink-light);
  box-shadow:0 20px 44px rgba(232,68,127,.22);
}
.video-thumb{
  position:relative;
  aspect-ratio:16/9;
  overflow:hidden;
  background:var(--pink-soft);
}
.video-thumb img{
  width:100%;height:100%;object-fit:cover;
  transition:transform .5s cubic-bezier(.2,.8,.3,1);
}
.video-card:hover .video-thumb img{transform:scale(1.07);}
/* 悬停遮罩（提示下载） */
.video-mask{
  position:absolute;inset:0;
  display:grid;place-items:center;
  background:linear-gradient(180deg,rgba(232,68,127,0) 0%,rgba(232,68,127,.62) 100%);
  opacity:0;
  transition:opacity .3s;
}
.video-card:hover .video-mask{opacity:1;}
.video-mask span{
  display:inline-flex;align-items:center;gap:6px;
  padding:9px 20px;border-radius:999px;
  background:#fff;color:var(--pink-deep);
  font-size:13px;font-weight:700;
  box-shadow:0 8px 22px rgba(0,0,0,.18);
  transform:translateY(6px);
  transition:transform .35s;
}
.video-card:hover .video-mask span{transform:translateY(0);}
.video-mask svg{width:14px;height:14px;}

.video-info{padding:16px 18px 18px;}
.video-info h3{
  font-size:15.5px;font-weight:700;
  margin-bottom:10px;line-height:1.45;
  color:var(--text);
  display:-webkit-box;
  -webkit-line-clamp:1;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.video-tag{
  display:inline-block;
  padding:3px 12px;
  border-radius:999px;
  background:var(--pink-soft);
  color:var(--pink-deep);
  font-size:12px;
  font-weight:600;
}

/* 空状态 */
.empty-state{
  display:none;
  text-align:center;
  padding:70px 20px;
  color:var(--muted);
}
.empty-state .emoji{font-size:44px;display:block;margin-bottom:12px;}

/* ============ 下载条 ============ */
.download-strip{padding:20px 0 100px;}
.strip-inner{
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  padding:34px 44px;
  border-radius:26px;
  background:linear-gradient(135deg,var(--pink) 0%,var(--pink-deep) 55%,#C9306A 100%);
  color:#fff;
  box-shadow:0 20px 50px rgba(232,68,127,.30);
  position:relative;
  overflow:hidden;
}
.strip-inner::before{
  content:"";position:absolute;
  width:280px;height:280px;border-radius:50%;
  background:rgba(255,255,255,.10);
  top:-130px;right:-60px;
}
.strip-inner > *{position:relative;z-index:2;}
.strip-inner h3{font-size:22px;font-weight:900;margin-bottom:6px;letter-spacing:-.3px;}
.strip-inner p{font-size:14.5px;opacity:.92;}

/* ============ 页脚 ============ */
.footer{background:#2B2430;color:#BFB4C2;padding:64px 0 28px;font-size:14.5px;}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;margin-bottom:46px;}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:16px;}
.footer-brand img{width:40px;height:40px;border-radius:12px;}
.footer-brand span{font-size:19px;font-weight:800;color:#fff;letter-spacing:.5px;}
.footer p.desc{color:#8E8393;max-width:300px;line-height:1.8;}
.footer h4{color:#fff;font-size:15.5px;font-weight:700;margin-bottom:18px;}
.footer li{margin-bottom:11px;}
.footer li a{transition:color .25s,padding-left .25s;}
.footer li a:hover{color:var(--pink);padding-left:5px;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.09);padding-top:24px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
  color:#7E7280;font-size:13.5px;
}

/* ============ 滚动淡入 ============ */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.8,.3,1);}
.reveal.show{opacity:1;transform:none;}

/* ============ 响应式 ============ */
@media (max-width:960px){
  .footer-top{grid-template-columns:1fr 1fr;gap:34px;}
  .footer-col-brand{grid-column:1 / -1;}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:20px;}
}
@media (max-width:760px){
  .nav-menu{
    position:fixed;top:var(--nav-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:4px;
    background:#fff;padding:16px 6% 24px;
    box-shadow:0 18px 34px rgba(255,107,174,.18);
    transform:translateY(-140%);transition:transform .38s cubic-bezier(.2,.8,.3,1);
  }
  .nav-menu.open{transform:translateY(0);}
  .nav-menu a{padding:13px 16px;border-radius:12px;font-size:16px;}
  .nav-menu a.active::after{display:none;}
  .hamburger{display:block;}
  .nav-right .btn{display:none;}
  .page-hero{padding:calc(var(--nav-h) + 44px) 0 36px;}
  .filter-chip{padding:9px 20px;font-size:14px;}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:16px;}
  .video-info{padding:13px 14px 15px;}
  .video-info h3{font-size:14px;}
  .strip-inner{padding:26px 22px;text-align:center;justify-content:center;}
  .strip-inner h3{font-size:19px;}
  .footer-top{grid-template-columns:1fr;}
}