/* Happy AI · 主样式 */
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:#0B0B17;
  color:#E8E8EF;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;background:none;border:0;color:inherit}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

:root{
  --bg:#0B0B17;
  --bg-2:#0F0F1E;
  --bg-3:#161628;
  --ink:#E8E8EF;
  --ink-2:#B8B8C8;
  --ink-3:#7A7A8E;
  --pink:#FF4D8D;
  --purple:#7C5BFF;
  --blue:#3FA9FF;
  --yellow:#FFD93D;
  --line:rgba(255,255,255,.08);
  --line-2:rgba(255,255,255,.14);
  --container:1200px;
  --r:14px;
  --grad:linear-gradient(135deg,#FF4D8D 0%,#7C5BFF 50%,#3FA9FF 100%);
}

.container,.nav-inner,.hero-inner,.section-head,.footer-inner{
  max-width:var(--container);margin:0 auto;padding:0 24px;
}

.grad-text{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  display:inline-block;
}

/* 导航 */
.nav{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  background:rgba(11,11,23,.72);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;gap:24px;height:64px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-mark{display:inline-flex;align-items:center;justify-content:center}
.brand-text{display:flex;flex-direction:column;line-height:1}
.brand-text strong{font-size:18px;font-weight:800;letter-spacing:.5px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.brand-text small{font-size:10px;color:var(--ink-3);letter-spacing:1.5px;margin-top:3px}
.nav-links{display:flex;gap:6px;flex:1 1 auto;justify-content:center}
.nav-links a{padding:8px 14px;border-radius:10px;color:var(--ink-2);font-weight:500;font-size:14px;transition:all .2s}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.05)}
.nav-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:8px 16px;border-radius:10px;font-weight:600;font-size:13px;
  transition:all .2s;border:1px solid transparent;
}
.btn.ghost{color:var(--ink-2);border-color:var(--line-2)}
.btn.ghost:hover{color:#fff;border-color:var(--purple);background:rgba(124,91,255,.08)}
.btn.primary{background:var(--grad);color:#fff;box-shadow:0 4px 12px rgba(255,77,141,.3)}
.btn.primary:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(124,91,255,.4)}
.hamburger{display:none;flex-direction:column;gap:4px;padding:8px}
.hamburger span{display:block;width:22px;height:2px;background:#fff;border-radius:2px}

/* HERO */
.hero{
  position:relative;overflow:hidden;
  min-height:calc(100vh - 64px);
  display:flex;align-items:center;
  background:radial-gradient(ellipse at top,#1A1A2E 0%,#0B0B17 60%);
}
.hero-bg{position:absolute;inset:0;pointer-events:none}
.halo{position:absolute;filter:blur(60px);opacity:.6}
.halo-pink{left:-10%;top:10%;width:50%;height:80%;background:radial-gradient(circle,rgba(255,77,141,.4) 0%,transparent 60%)}
.halo-purple{left:30%;top:30%;width:50%;height:80%;background:radial-gradient(circle,rgba(124,91,255,.35) 0%,transparent 60%)}
.halo-blue{right:-10%;top:0;width:50%;height:80%;background:radial-gradient(circle,rgba(63,169,255,.3) 0%,transparent 60%)}
.hero-inner{
  position:relative;z-index:1;
  max-width:var(--container);
  width:100%;margin:0 auto;
  display:grid;grid-template-columns:1.2fr 1fr;
  gap:60px;align-items:center;
  padding:80px 24px 100px;
}
.hero-text{max-width:600px}
.badges{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.badge{
  display:inline-flex;align-items:center;gap:4px;
  padding:6px 14px;border-radius:999px;
  background:rgba(255,255,255,.05);
  border:1px solid var(--line-2);
  color:var(--ink);font-size:12px;font-weight:600;letter-spacing:.5px;
}
.badge:nth-child(1){background:rgba(255,217,61,.1);border-color:rgba(255,217,61,.3);color:var(--yellow)}
.badge:nth-child(2){background:rgba(255,77,141,.1);border-color:rgba(255,77,141,.3);color:var(--pink)}
.badge:nth-child(3){background:rgba(124,91,255,.1);border-color:rgba(124,91,255,.3);color:var(--purple)}
.hero h1{
  font-size:clamp(40px,6vw,72px);
  font-weight:900;line-height:1.1;margin:0 0 18px;
  color:#fff;letter-spacing:1px;
}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(135deg,var(--pink) 0%,var(--purple) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  display:inline-block;margin-top:6px;font-size:.6em;
}
.hero .sub{font-size:17px;color:var(--ink-2);margin:0 0 32px;line-height:1.7}
.hero .sub strong{color:#fff;font-weight:700}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:40px}
.cta{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 24px;border-radius:12px;
  font-weight:700;font-size:15px;
  transition:all .25s;border:1px solid transparent;
}
.cta.primary{background:var(--grad);color:#fff;box-shadow:0 8px 24px rgba(255,77,141,.3)}
.cta.primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(124,91,255,.5)}
.cta.ghost{background:rgba(255,255,255,.05);color:#fff;border-color:var(--line-2)}
.cta.ghost:hover{background:rgba(255,255,255,.1);border-color:var(--purple)}
.cta.big{padding:18px 36px;font-size:17px}
.hero-stats{list-style:none;display:flex;gap:32px;padding:0;margin:0;flex-wrap:wrap}
.hero-stats li{display:flex;flex-direction:column;line-height:1.1}
.hero-stats b{font-size:26px;font-weight:800}
.hero-stats span{font-size:12px;color:var(--ink-3);margin-top:4px;letter-spacing:.5px}
.hero-mark{
  position:relative;
  max-width:440px;aspect-ratio:1;
  margin-left:auto;
  animation:float 6s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
.scroll-cue{
  position:absolute;left:50%;bottom:24px;transform:translateX(-50%);
  width:24px;height:38px;border:2px solid var(--ink-3);border-radius:12px;
  display:flex;justify-content:center;padding-top:6px;opacity:.7;
}
.scroll-cue:hover{opacity:1}
.scroll-cue span{
  display:block;width:3px;height:8px;background:var(--pink);
  border-radius:2px;animation:scrollDot 1.6s ease-in-out infinite;
}
@keyframes scrollDot{0%{transform:translateY(0);opacity:1}100%{transform:translateY(14px);opacity:0}}

/* 通用 Section */
.section{padding:80px 0;position:relative}
.section-head{
  display:grid;grid-template-columns:1fr auto;align-items:end;gap:8px 16px;
  margin-bottom:36px;max-width:var(--container);margin-left:auto;margin-right:auto;padding:0 24px;
}
.section-head h2{font-size:28px;font-weight:800;margin:0;color:#fff;display:flex;align-items:center;gap:10px;letter-spacing:1px}
.section-head .more{font-size:13px;color:var(--pink);font-weight:600;white-space:nowrap;grid-column:2;grid-row:1/3;align-self:center}
.section-head .more:hover{text-decoration:underline}
.section-desc{grid-column:1/2;grid-row:2;color:var(--ink-2);font-size:14px;margin:0;max-width:560px}
.dot{width:8px;height:24px;background:var(--grad);border-radius:2px;display:inline-block}

/* 工具卡片 */
.tool-grid{
  max-width:var(--container);margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;
}
.tool-card{
  position:relative;
  background:var(--bg-2);
  border:1px solid var(--line);
  border-radius:18px;padding:24px;
  transition:all .25s;overflow:hidden;
  display:flex;flex-direction:column;
}
.tool-card::before{
  content:"";position:absolute;inset:0;
  background:var(--grad);opacity:0;transition:opacity .3s;
  z-index:0;
}
.tool-card>*{position:relative;z-index:1}
.tool-card:hover{transform:translateY(-4px);border-color:rgba(255,77,141,.3);box-shadow:0 16px 40px rgba(255,77,141,.15)}
.tool-icon{
  width:64px;height:64px;border-radius:14px;
  display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,rgba(255,77,141,.15),rgba(124,91,255,.15));
  color:var(--pink);
  margin-bottom:16px;
}
.tool-t2i .tool-icon{color:var(--pink)}
.tool-i2i .tool-icon{color:var(--purple)}
.tool-video .tool-icon{color:var(--blue)}
.tool-faceswap .tool-icon{color:#FF6B35}
.tool-chat .tool-icon{color:var(--yellow)}
.tool-cngpt .tool-icon{color:#10B981}
.tool-card h3{margin:0 0 8px;font-size:18px;color:#fff;font-weight:800}
.tool-card p{margin:0 0 14px;font-size:13px;color:var(--ink-2);line-height:1.6;flex:1}
.tool-meta{list-style:none;padding:0;margin:0 0 16px;display:flex;flex-wrap:wrap;gap:6px}
.tool-meta li{
  font-size:11px;padding:3px 8px;border-radius:6px;
  background:rgba(255,255,255,.05);color:var(--ink-2);
  border:1px solid var(--line);
}
.tool-cta{
  font-size:13px;font-weight:700;
  color:var(--pink);
  display:inline-flex;align-items:center;gap:4px;
  transition:gap .2s;
}
.tool-card:hover .tool-cta{gap:8px;color:var(--purple)}

/* 模型 */
.model-grid{
  max-width:var(--container);margin:0 auto;padding:0 24px;
  display:flex;flex-wrap:wrap;gap:10px;
}
.model-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;border-radius:999px;
  background:var(--bg-2);border:1px solid var(--line);
  color:#fff;font-size:13px;font-weight:500;
  transition:all .2s;
}
.model-chip:hover{background:rgba(255,77,141,.08);border-color:var(--pink);transform:translateY(-2px)}
.dot-color{width:8px;height:8px;border-radius:50%;display:inline-block}

/* 作品 */
.gallery-grid{
  max-width:var(--container);margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:18px;
}
.art-card{
  background:var(--bg-2);
  border:1px solid var(--line);
  border-radius:var(--r);
  overflow:hidden;transition:all .25s;cursor:pointer;
}
.art-card:hover{transform:translateY(-4px);border-color:rgba(255,77,141,.4);box-shadow:0 16px 32px rgba(0,0,0,.4)}
.art-thumb{position:relative;aspect-ratio:1;display:flex;align-items:center;justify-content:center;color:#fff}
.a1 .art-thumb{background:linear-gradient(135deg,#1a1a3e,#7c2c8e 50%,#ff4d8d)}
.a2 .art-thumb{background:linear-gradient(135deg,#0f2a3d,#1c5a8e 50%,#5faee0)}
.a3 .art-thumb{background:radial-gradient(circle at 30% 30%,#2a1a5e,#0a0a2e 70%,#3a1a4e)}
.a4 .art-thumb{background:linear-gradient(135deg,#3d2c0e,#8a6810 50%,#e0b341)}
.a5 .art-thumb{background:linear-gradient(135deg,#3a1c1c,#7a2418 50%,#c4641d)}
.a6 .art-thumb{background:linear-gradient(135deg,#3d0e3d,#8a108a 50%,#e05fd2)}
.a7 .art-thumb{background:linear-gradient(135deg,#0e3d3a,#108a6c 50%,#5fc4be)}
.a8 .art-thumb{background:linear-gradient(135deg,#3d3a0e,#8a8510 50%,#e0d341)}
.art-tag{
  position:absolute;top:10px;left:10px;
  padding:4px 10px;border-radius:6px;
  background:rgba(0,0,0,.5);backdrop-filter:blur(4px);
  font-size:11px;font-weight:600;letter-spacing:.5px;
}
.art-card h3{margin:14px 14px 4px;font-size:14px;color:#fff;font-weight:700}
.art-meta{margin:0 14px 14px;font-size:11px;color:var(--ink-3)}

/* How */
.how-grid{
  max-width:var(--container);margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;
}
.how-step{
  text-align:center;padding:32px 24px;
  background:var(--bg-2);border:1px solid var(--line);border-radius:18px;
  position:relative;transition:all .25s;
}
.how-step:hover{border-color:rgba(255,77,141,.3);transform:translateY(-4px)}
.how-num{
  font-size:48px;font-weight:900;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
  margin-bottom:12px;line-height:1;
}
.how-step h3{margin:0 0 8px;font-size:18px;color:#fff;font-weight:800}
.how-step p{margin:0;color:var(--ink-2);font-size:14px;line-height:1.6}

/* Why */
.why-grid{
  max-width:var(--container);margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px;
}
.why-card{background:var(--bg-2);border:1px solid var(--line);border-radius:var(--r);padding:24px;transition:all .2s}
.why-card:hover{border-color:rgba(255,77,141,.3);transform:translateY(-3px)}
.why-icon{font-size:32px;margin-bottom:12px}
.why-card h3{margin:0 0 8px;font-size:16px;color:#fff;font-weight:700}
.why-card p{margin:0;font-size:13px;color:var(--ink-2);line-height:1.6}

/* FAQ */
.faq-list{max-width:860px;margin:0 auto;padding:0 24px;display:grid;gap:12px}
.faq-item{
  background:var(--bg-2);border:1px solid var(--line);border-radius:var(--r);
  padding:18px 22px;transition:all .2s;
}
.faq-item[open]{border-color:rgba(255,77,141,.3)}
.faq-item summary{
  cursor:pointer;font-weight:700;font-size:15px;color:#fff;
  display:flex;align-items:center;justify-content:space-between;
  list-style:none;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";font-size:24px;font-weight:300;color:var(--pink);
  transition:transform .2s;
}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{margin:12px 0 0;color:var(--ink-2);font-size:14px;line-height:1.7}
.link{color:var(--pink);text-decoration:underline}

/* CTA */
.cta-section{padding:60px 0 100px}
.cta-inner{
  max-width:860px;margin:0 auto;padding:60px 32px;
  text-align:center;background:var(--bg-2);
  border:1px solid var(--line-2);border-radius:24px;
  background-image:
    radial-gradient(ellipse at top left,rgba(255,77,141,.15),transparent 50%),
    radial-gradient(ellipse at bottom right,rgba(63,169,255,.15),transparent 50%);
}
.cta-inner h2{font-size:40px;font-weight:900;margin:0 0 12px;line-height:1.2}
.cta-inner p{color:var(--ink-2);font-size:16px;margin:0 0 28px}
.cta-note{color:var(--ink-3);font-size:12px;display:block;margin-top:16px}

/* Footer */
.footer{border-top:1px solid var(--line);background:#08080F;padding:60px 0 30px;margin-top:60px}
.footer-inner{
  max-width:var(--container);margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1.5fr;gap:40px;
}
.foot-brand strong{display:block;font-size:20px;margin-bottom:10px}
.foot-brand strong,.foot-brand strong *{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;display:inline-block}
.foot-brand p{margin:6px 0;color:var(--ink-3);font-size:13px;line-height:1.6}
.foot-tagline{color:var(--ink-2)!important}
.foot-col h4{margin:0 0 14px;font-size:13px;color:#fff;font-weight:700;letter-spacing:1px}
.foot-col a{display:block;padding:4px 0;color:var(--ink-2);font-size:13px;transition:color .2s}
.foot-col a:hover{color:var(--pink)}
.foot-contact span{display:block;color:var(--ink-3);font-size:12px;line-height:1.9}

/* 响应式 */
@media (max-width:960px){
  .nav-links,.nav-actions .btn.ghost{display:none}
  .hamburger{display:flex}
  .hero-inner{grid-template-columns:1fr;gap:30px;padding:40px 24px 80px}
  .hero-mark{max-width:240px;margin:0 auto;order:2}
  .hero-text{order:1;text-align:center}
  .cta-row{justify-content:center}
  .hero-stats{justify-content:center}
  .footer-inner{grid-template-columns:1fr 1fr;gap:30px}
  .section-head{grid-template-columns:1fr;gap:4px}
  .section-head .more{grid-column:1;grid-row:3}
}
@media (max-width:560px){
  .hero h1{font-size:38px}
  .footer-inner{grid-template-columns:1fr}
  .section{padding:50px 0}
  .gallery-grid{grid-template-columns:repeat(2,1fr)}
  .nav-actions .btn.primary{padding:6px 12px;font-size:12px}
  .cta-inner h2{font-size:28px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .hero-mark{animation:none}
}