/* ==========================================================================
   灵映AI 官网 · LingYing AI Landing Page
   纯 HTML + CSS · 桌面网页 · 极光紫 × 青 双色调
   ========================================================================== */

:root{
  --bg:        #06040f;
  --bg-2:      #0a0718;
  --card:      rgba(146,128,255,.06);
  --card-hover:rgba(146,128,255,.11);
  --line:      rgba(148,128,255,.16);
  --text:      #f4f2ff;
  --text-2:    #cfc8e6;
  --text-3:    #8f86ad;
  --violet:    #8f6bff;
  --magenta:   #d86bff;
  --cyan:      #4cd6f7;
  --grad:      linear-gradient(120deg,#8f6bff 0%,#d86bff 52%,#4cd6f7 130%);
  --grad-btn:  linear-gradient(120deg,#8b5cf6 0%,#c84df0 60%,#e879f9 100%);
  --radius:    20px;
  --maxw:      1180px;
  --ease:      cubic-bezier(.22,1,.36,1);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
em{font-style:normal}
.grad{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 28px}

/* ---------- 背景：极光 + 网格 ---------- */
.bg-fx{position:fixed;inset:0;z-index:-2;overflow:hidden;background:linear-gradient(180deg,#080512 0%,#06040f 40%,#070512 100%)}
.aurora{position:absolute;width:900px;height:900px;border-radius:50%;filter:blur(120px);opacity:.5}
.aurora-1{background:radial-gradient(circle,rgba(124,77,255,.34),transparent 65%);top:-420px;left:-180px;animation:aurora-drift 16s ease-in-out infinite alternate}
.aurora-2{background:radial-gradient(circle,rgba(76,214,247,.20),transparent 65%);bottom:-460px;right:-220px;animation:aurora-drift 20s ease-in-out infinite alternate-reverse}
@keyframes aurora-drift{
  from{transform:translate(0,0) scale(1)}
  to{transform:translate(70px,50px) scale(1.12)}
}
.grid-lines{
  position:absolute;inset:0;opacity:.5;
  background-image:
    linear-gradient(rgba(148,128,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(148,128,255,.05) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(720px 480px at 50% 0%,#000 30%,transparent 75%);
  mask-image:radial-gradient(720px 480px at 50% 0%,#000 30%,transparent 75%);
}
.bg-fx::after{ /* 噪点 */
  content:"";position:absolute;inset:0;opacity:.045;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:12px;
  padding:14px 28px;border-radius:999px;
  font-size:15.5px;font-weight:600;cursor:pointer;white-space:nowrap;
  border:1px solid transparent;
  transition:transform .2s var(--ease),box-shadow .3s,border-color .3s,background .3s;
}
.btn svg{width:22px;height:22px;flex:none}
.btn small{display:block;font-size:10.5px;font-weight:400;opacity:.72;line-height:1.25;text-align:left}
.btn span{font-size:16px;line-height:1.25}
.btn-primary{
  color:#fff;background:var(--grad-btn);
  box-shadow:0 12px 34px -10px rgba(178,84,240,.65);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 18px 44px -10px rgba(178,84,240,.8)}
.btn-ghost{
  color:var(--text-2);border-color:rgba(255,255,255,.16);background:rgba(255,255,255,.03);
}
.btn-ghost:hover{transform:translateY(-3px);border-color:rgba(76,214,247,.45);color:#fff}
.btn-sm{padding:10px 22px;font-size:14px}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:100;
  background:rgba(6,4,15,.72);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(148,128,255,.12);
}
.nav-inner{display:flex;align-items:center;height:72px;gap:44px}
.brand{display:flex;align-items:center;gap:12px}
.brand-logo{width:35px;height:35px;border-radius:9px;box-shadow:0 4px 16px rgba(143,107,255,.45)}
.brand-name{font-size:19px;font-weight:800;letter-spacing:.04em}
.brand-name em{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.nav-links{display:flex;gap:34px;margin-left:auto}
.nav-links a{
  font-size:15px;color:var(--text-3);position:relative;padding:6px 0;
  transition:color .2s;
}
.nav-links a::after{
  content:"";position:absolute;left:50%;right:50%;bottom:-2px;height:2px;border-radius:2px;
  background:var(--grad);transition:left .25s var(--ease),right .25s var(--ease);
}
.nav-links a:hover{color:#fff}
.nav-links a:hover::after{left:0;right:0}
.nav-links a.active{color:#fff}
.nav-links a.active::after{left:0;right:0}

/* ---------- 首屏 ---------- */
.hero{position:relative;padding:96px 0 110px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.02fr 1fr;gap:56px;align-items:center}
.badge{
  display:inline-flex;align-items:center;gap:9px;
  font-size:13px;color:var(--text-2);letter-spacing:.06em;
  border:1px solid var(--line);border-radius:999px;padding:7px 16px;
  background:rgba(146,128,255,.06);
}
.badge i{
  width:7px;height:7px;border-radius:50%;background:var(--grad-btn);
  box-shadow:0 0 10px rgba(200,77,240,.9);animation:pulse 2.2s infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.hero h1{
  font-size:clamp(38px,4.6vw,58px);line-height:1.22;font-weight:800;
  letter-spacing:.01em;margin:26px 0 20px;
}
.hero .sub{font-size:16.5px;color:var(--text-3);line-height:1.85}
.cta-row{display:flex;gap:16px;margin-top:36px;flex-wrap:wrap}
.cta-row.center{justify-content:center}
.trust{
  display:flex;gap:0;margin-top:44px;
  border:1px solid var(--line);border-radius:16px;overflow:hidden;
  background:rgba(146,128,255,.04);
}
.trust li{
  flex:1;padding:16px 8px;text-align:center;
  border-right:1px solid var(--line);
}
.trust li:last-child{border-right:none}
.trust b{
  display:block;font-size:22px;font-weight:800;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.trust span{font-size:12px;color:var(--text-3)}

/* 首屏视觉：AI视频主卡 + AI音乐叠放卡 */
.hero-visual{position:relative;animation:floaty 8s ease-in-out infinite;padding-bottom:54px}
.glow{position:absolute;border-radius:50%;filter:blur(74px);pointer-events:none}
.glow-a{width:340px;height:340px;background:radial-gradient(circle,rgba(143,107,255,.36),transparent 70%);top:-10%;left:-8%}
.glow-b{width:300px;height:300px;background:radial-gradient(circle,rgba(76,214,247,.26),transparent 70%);bottom:-10%;right:-6%}
.hero-visual .h-main{position:relative;z-index:2;width:94%}
.hero-visual .h-sub{
  position:absolute;z-index:1;width:52%;
  right:-2%;bottom:0;transform:rotate(5deg);
  opacity:.55;filter:saturate(.9);
}
.hero-visual .h-sub img{filter:brightness(.9)}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-13px)}}

/* 悬浮胶囊 */
.chip{
  position:absolute;z-index:6;white-space:nowrap;
  font-size:13px;color:var(--text);
  padding:9px 16px;border-radius:999px;
  background:rgba(16,10,34,.72);border:1px solid rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  box-shadow:0 14px 34px -12px rgba(0,0,0,.65);
  animation:floaty 6s ease-in-out infinite;
}
.chip-1{top:6%;left:-26px;animation-delay:-2s}
.chip-2{top:42%;right:-22px;animation-delay:-4s}
.chip-3{bottom:-4%;left:10%;animation-delay:-1s}

/* ---------- 通用区块 ---------- */
.section{padding:112px 0;position:relative}
.section-alt::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent,rgba(146,128,255,.045) 30%,rgba(146,128,255,.045) 70%,transparent);
  pointer-events:none;
}
.sec-head{text-align:center;max-width:660px;margin:0 auto 64px;position:relative;z-index:1}
.kicker{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;font-weight:600;letter-spacing:.28em;color:var(--cyan);
}
.kicker::before,.kicker::after{content:"";width:26px;height:1px;background:linear-gradient(90deg,transparent,var(--cyan))}
.kicker::after{background:linear-gradient(90deg,var(--cyan),transparent)}
.sec-head h2{font-size:clamp(30px,3.4vw,42px);font-weight:800;line-height:1.3;margin:16px 0 14px}
.sec-head p{font-size:15.5px;color:var(--text-3)}

/* ---------- 功能卡片 ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.f-card{
  position:relative;padding:32px 28px;border-radius:var(--radius);
  background:var(--card);border:1px solid var(--line);
  transition:transform .28s var(--ease),border-color .28s,background .28s,box-shadow .28s;
  overflow:hidden;
}
.f-card::before{ /* 顶部渐变光线 */
  content:"";position:absolute;top:0;left:12%;right:12%;height:1px;
  background:linear-gradient(90deg,transparent,rgba(143,107,255,.55),rgba(76,214,247,.55),transparent);
  opacity:0;transition:opacity .3s;
}
.f-card:hover{
  transform:translateY(-6px);
  border-color:rgba(143,107,255,.4);
  background:var(--card-hover);
  box-shadow:0 26px 60px -24px rgba(100,60,220,.5);
}
.f-card:hover::before{opacity:1}
.f-ic{
  width:52px;height:52px;border-radius:14px;display:grid;place-items:center;
  background:linear-gradient(135deg,rgba(143,107,255,.2),rgba(76,214,247,.14));
  border:1px solid rgba(143,107,255,.3);
  color:#b9a3ff;margin-bottom:20px;
}
.f-ic svg{width:24px;height:24px}
.f-card:hover .f-ic{color:var(--cyan)}
.f-card h3{font-size:19px;font-weight:700;margin-bottom:10px}
.f-card p{font-size:14.5px;color:var(--text-3);line-height:1.75}

/* ---------- 产品展示 ---------- */
.show-row{
  display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center;
  padding:44px 0;
}
.show-row + .show-row{margin-top:24px}
.show-row.rev .show-media{order:2}
.show-row.rev .show-copy{order:1}
.show-media{position:relative;min-height:340px}
.show-copy .num{
  font-size:15px;font-weight:800;letter-spacing:.14em;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.show-copy h3{font-size:clamp(24px,2.4vw,31px);font-weight:800;line-height:1.4;margin:12px 0 16px}
.show-copy p{font-size:15.5px;color:var(--text-3);line-height:1.85}
.pts{margin-top:24px;display:grid;gap:13px}
.pts li{
  position:relative;padding-left:32px;font-size:15px;color:var(--text-2);
}
.pts li::before{
  content:"✓";position:absolute;left:0;top:2px;
  width:21px;height:21px;border-radius:50%;display:grid;place-items:center;
  font-size:11px;font-weight:800;color:#0a0618;
  background:linear-gradient(135deg,#8f6bff,#4cd6f7);
}

/* 截图卡片 */
.shot{
  position:absolute;left:50%;top:50%;
  --tx:-50%;--ty:-50%;
  animation:floaty-keep 7s ease-in-out infinite;
}
@keyframes floaty-keep{
  0%,100%{transform:translate(var(--tx,0px),var(--ty,0px))}
  50%{transform:translate(var(--tx,0px),calc(var(--ty,0px) - 13px))}
}
.shot-card{
  background:linear-gradient(180deg,rgba(255,255,255,.10),rgba(255,255,255,.03));
  border:1px solid rgba(255,255,255,.16);
  border-radius:22px;padding:9px;
  box-shadow:0 38px 90px -26px rgba(110,70,230,.55),inset 0 1px 0 rgba(255,255,255,.12);
  transition:transform .35s var(--ease);
}
.shot-card img{width:100%;border-radius:14px}
.shot-card.tilt-l{transform:rotate(-3.5deg)}
.shot-card.tilt-r{transform:rotate(3.5deg)}
.shot:hover .shot-card{transform:rotate(0) scale(1.02)}

.show-media .main{width:78%;--tx:-50%;--ty:-50%}
.show-media .s-main{width:72%;--tx:-78%;--ty:-54%;animation-delay:-2.4s}
.show-media .s-sub{width:58%;--tx:-8%;--ty:-38%;animation-delay:-4.8s}
.show-media .chip-1{left:-6px;top:2%}
.show-media .chip-2{right:-6px;bottom:6%}

/* AI视频行：玩法标签竖排 */
.media-video .shot.main{width:72%;--tx:-68%;--ty:-50%}
.play-stack{
  position:absolute;right:0;top:50%;transform:translateY(-50%);
  display:flex;flex-direction:column;gap:14px;z-index:5;
}
.play-stack .pill{
  display:flex;align-items:center;gap:8px;
  font-size:13.5px;font-weight:600;color:var(--text);white-space:nowrap;
  padding:10px 16px;border-radius:12px;
  background:rgba(16,10,34,.72);border:1px solid rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  box-shadow:0 14px 34px -12px rgba(0,0,0,.65);
  animation:floaty 6s ease-in-out infinite;
}
.play-stack .pill:nth-child(2){animation-delay:-2s;margin-right:12px}
.play-stack .pill:nth-child(3){animation-delay:-4s;margin-right:4px}
.play-stack .pill i{font-style:normal;font-size:15px}

/* ---------- 下载区块 ---------- */
.dl-band{
  position:relative;overflow:hidden;text-align:center;
  border-radius:28px;padding:88px 40px;
  background:linear-gradient(140deg,rgba(146,128,255,.10),rgba(76,214,247,.05));
  border:1px solid rgba(148,128,255,.25);
}
.dl-glow{
  position:absolute;left:50%;top:-140px;width:640px;height:340px;
  transform:translateX(-50%);border-radius:50%;filter:blur(90px);
  background:radial-gradient(ellipse,rgba(178,84,240,.4),rgba(76,214,247,.16),transparent 70%);
  pointer-events:none;
}
.dl-band > *{position:relative;z-index:1}
.dl-logo{
  width:86px;height:86px;border-radius:22px;margin:0 auto 24px;
  box-shadow:0 20px 54px -12px rgba(143,107,255,.6);
}
.dl-band h2{font-size:clamp(30px,3.2vw,42px);font-weight:800}
.dl-band p{font-size:15.5px;color:var(--text-3);margin:14px 0 34px}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid rgba(148,128,255,.14);background:rgba(4,3,10,.6)}
.foot-top{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:40px;
  padding:56px 0 44px;
}
.foot-desc{font-size:14px;color:var(--text-3);margin-top:16px;max-width:280px;line-height:1.8}
.foot-col h4{font-size:15px;font-weight:700;margin-bottom:18px}
.foot-col li{margin-bottom:11px;font-size:14px;color:var(--text-3)}
.foot-col li a{transition:color .2s}
.foot-col li a:hover{color:var(--cyan)}
.foot-bottom{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:14px;
  padding:22px 0;border-top:1px solid rgba(148,128,255,.12);
  font-size:13px;color:var(--text-3);
}
.foot-bottom a{transition:color .2s}
.foot-bottom a:hover{color:var(--cyan)}

/* ---------- 入场动画（无 JS） ---------- */
.fade-up{opacity:0;animation:rise .9s var(--ease) forwards}
.d1{animation-delay:.08s}.d2{animation-delay:.18s}.d3{animation-delay:.3s}.d4{animation-delay:.42s}
@keyframes rise{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:translateY(0)}}

@supports (animation-timeline:view()){
  @media (prefers-reduced-motion:no-preference){
    .reveal{
      animation:rise linear both;
      animation-timeline:view();
      animation-range:entry 4% entry 42%;
    }
  }
}

/* ==========================================================================
   协议 / 隐私 文档页
   ========================================================================== */
.doc{max-width:820px;margin:0 auto;padding:48px 28px 90px}
.doc h1{font-size:32px;letter-spacing:.02em;margin-bottom:8px}
.doc .doc-date{font-size:13px;color:var(--text-3);margin-bottom:36px}
.doc h2{
  font-size:19px;margin:38px 0 14px;padding-left:14px;
  border-left:3px solid;border-image:linear-gradient(180deg,#8f6bff,#4cd6f7) 1;
}
.doc p,.doc li{font-size:14.5px;color:var(--text-2);margin-bottom:10px}
.doc ul{padding-left:20px;list-style:disc}
.doc-back{
  position:fixed;left:24px;bottom:24px;z-index:50;
  font-size:13px;color:var(--text-2);
  padding:9px 18px;border-radius:999px;
  border:1px solid var(--line);background:rgba(12,8,26,.75);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  transition:color .25s,border-color .25s;
}
.doc-back:hover{color:#fff;border-color:rgba(76,214,247,.5)}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1024px){
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .hero-grid{grid-template-columns:1fr;gap:48px}
  .hero-visual{max-width:640px;margin:0 auto;width:100%}
  .show-row{grid-template-columns:1fr;gap:30px}
  .show-row.rev .show-media{order:1}
  .show-row.rev .show-copy{order:2}
  .show-media{min-height:300px}
  .foot-top{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .nav-links{display:none}
  .nav-inner{height:64px}
  .nav-cta{margin-left:auto}
  .section{padding:72px 0}
  .hero{padding:64px 0 80px}
  .hero h1{font-size:34px}
  .feature-grid{grid-template-columns:1fr}
  .trust{flex-wrap:wrap}
  .trust li{flex:1 1 45%;border-bottom:1px solid var(--line)}
  .cta-row .btn{width:100%;justify-content:center}
  .show-media{min-height:250px}
  .media-video{min-height:330px}
  .media-video .shot.main{width:100%;--tx:-50%}
  .play-stack{left:50%;right:auto;top:auto;bottom:-4px;transform:translateX(-50%);flex-direction:row;gap:8px}
  .play-stack .pill{font-size:11.5px;padding:7px 11px;gap:5px}
  .play-stack .pill:nth-child(2),.play-stack .pill:nth-child(3){margin-right:0}
  .chip-1{left:-4px}.chip-2{right:-4px}
  .dl-band{padding:64px 24px}
  .foot-top{grid-template-columns:1fr;gap:32px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s !important;animation-iteration-count:1 !important;transition-duration:.001s !important}
  html{scroll-behavior:auto}
}