:root{
  --bg: #070b16;
  --bg-2: #0b1020;
  --panel: rgba(11, 16, 32, .72);
  --panel-2: rgba(255, 255, 255, .04);
  --line: rgba(255, 255, 255, .10);
  --text: #eaf2ff;
  --muted: rgba(234, 242, 255, .72);
  --muted-2: rgba(234, 242, 255, .56);
  --primary: #7c3aed;
  --accent: #06b6d4;
  --accent-2: #22c55e;
  --shadow: 0 24px 80px rgba(0, 0, 0, .35);
  --radius: 20px;
  --radius-sm: 14px;
  --container: 1200px;
}

*{
  box-sizing: border-box;
}

html{
  scroll-behavior: smooth;
}

body{
  margin: 0;
  font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(124,58,237,.20), transparent 34%),
    radial-gradient(circle at top right, rgba(6,182,212,.18), transparent 30%),
    radial-gradient(circle at center, rgba(34,197,94,.10), transparent 28%),
    linear-gradient(180deg, #050810 0%, #09101e 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

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

a{
  color: inherit;
  text-decoration: none;
}

p{
  line-height: 1.75;
  color: var(--muted);
}

ul{
  padding-left: 1.2rem;
}

.container{
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
}

.section{
  padding: 96px 0;
  position: relative;
  z-index: 1;
}

.section-alt{
  background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.01));
  border-top: 1px solid rgba(255,255,255,.04);
  border-bottom: 1px solid rgba(255,255,255,.04);
}

.site-header{
  position: sticky;
  top: 0;
  z-index: 99;
  backdrop-filter: blur(18px);
  background: rgba(7, 11, 22, .58);
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.nav-wrap{
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 76px;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: max-content;
}

.brand-logo{
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(6, 182, 212, .25);
  object-fit: cover;
}

.brand-text{
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-text strong{
  font-size: 1rem;
  letter-spacing: .3px;
}

.brand-text small{
  color: var(--muted-2);
  margin-top: 4px;
}

.site-nav{
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
}

.site-nav a{
  color: var(--muted);
  font-size: .95rem;
  transition: .25s ease;
  position: relative;
}

.site-nav a::after{
  content: "";
  position: absolute;
  left: 0;
  bottom: -10px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  border-radius: 999px;
  transition: .25s ease;
}

.site-nav a:hover,
.site-nav a.active{
  color: #fff;
}

.site-nav a:hover::after,
.site-nav a.active::after{
  width: 100%;
}

.nav-actions{
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle{
  display: none;
  margin-left: auto;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 14px;
  background: rgba(255,255,255,.03);
  cursor: pointer;
  padding: 10px;
}

.nav-toggle span{
  display: block;
  height: 2px;
  border-radius: 999px;
  background: #fff;
  margin: 5px 0;
  transition: .25s ease;
}

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  letter-spacing: .2px;
  transition: .25s ease;
  white-space: nowrap;
}

.btn:hover{
  transform: translateY(-2px);
}

.btn-primary{
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: 0 16px 35px rgba(124, 58, 237, .25);
}

.btn-primary:hover{
  box-shadow: 0 22px 40px rgba(6, 182, 212, .22);
}

.btn-ghost{
  background: rgba(255,255,255,.03);
  border-color: rgba(255,255,255,.12);
  color: #fff;
}

.btn-ghost:hover{
  background: rgba(255,255,255,.07);
}

.hero{
  padding-top: 72px;
}

.hero-grid{
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 34px;
  align-items: center;
}

.eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  color: #bfefff;
  font-size: .85rem;
  letter-spacing: .3px;
}

.hero h1{
  margin: 18px 0 18px;
  font-size: clamp(2.2rem, 4vw, 4.8rem);
  line-height: 1.06;
  letter-spacing: -0.04em;
  color: #fff;
}

.lead{
  font-size: 1.06rem;
  color: rgba(234,242,255,.84);
  max-width: 62ch;
}

.hero-actions{
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 28px 0;
}

.hero-stats{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.stat-card,
.card,
.panel-card,
.code-card,
.cta-card{
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.stat-card{
  padding: 18px;
}

.stat-card strong{
  display: block;
  font-size: 1rem;
  color: #fff;
  margin-bottom: 8px;
}

.stat-card span{
  color: var(--muted-2);
  font-size: .93rem;
}

.hero-panel{
  display: grid;
  gap: 16px;
}

.panel-card{
  padding: 22px;
}

.panel-head,
.card-top{
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
  margin-bottom: 14px;
}

.panel-card h2{
  margin: 0 0 16px;
  font-size: 1.4rem;
  line-height: 1.35;
}

.feature-list{
  margin: 0;
  padding-left: 1.2rem;
}

.feature-list li{
  margin: 10px 0;
  color: rgba(234,242,255,.84);
}

.feature-list.compact li{
  margin: 8px 0;
}

.code-card{
  padding: 18px;
}

.code-head{
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.code-head span{
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,.22);
}

.code-head span:nth-child(1){ background: #ef4444; }
.code-head span:nth-child(2){ background: #f59e0b; }
.code-head span:nth-child(3){ background: #22c55e; }

pre{
  margin: 0;
  overflow: auto;
  color: #d4f4ff;
  font-size: .95rem;
  line-height: 1.7;
}

.section-head{
  margin-bottom: 30px;
  max-width: 760px;
}

.section-head h2{
  margin: 16px 0 12px;
  font-size: clamp(1.7rem, 2.6vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.section-head p{
  margin: 0;
}

.grid{
  display: grid;
  gap: 18px;
}

.grid-4{
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-3{
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-5{
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.card{
  padding: 22px;
  transition: .25s ease;
  position: relative;
  overflow: hidden;
}

.card::before{
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(6,182,212,.06), rgba(124,58,237,.04), transparent 60%);
  pointer-events: none;
}

.card:hover{
  transform: translateY(-4px);
  border-color: rgba(6,182,212,.35);
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
}

.card h3,
.card strong{
  color: #fff;
}

.card h3{
  margin: 12px 0 10px;
  font-size: 1.16rem;
}

.card p{
  margin: 0;
}

.card ul{
  margin: 16px 0 0;
  color: rgba(234,242,255,.82);
}

.chip{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(124,58,237,.26), rgba(6,182,212,.22));
  border: 1px solid rgba(255,255,255,.10);
  color: #e9fbff;
  font-size: .82rem;
  white-space: nowrap;
}

.chip-soft{
  background: rgba(255,255,255,.05);
  color: var(--muted);
}

.model-card ul,
.project-card ul,
.scenario-card ul{
  padding-left: 1rem;
}

.feature-card p,
.scenario-card p,
.project-card p,
.model-card p{
  min-height: 92px;
}

.section-alt .card{
  background: rgba(8, 14, 28, .76);
}

.faq-list{
  display: grid;
  gap: 14px;
}

.faq-item{
  padding: 0;
}

.faq-item summary{
  list-style: none;
  cursor: pointer;
  padding: 22px;
  font-weight: 600;
  color: #fff;
}

.faq-item summary::-webkit-details-marker{
  display: none;
}

.faq-item .faq-content{
  padding: 0 22px 22px;
}

.faq-item[open]{
  border-color: rgba(6,182,212,.38);
}

.cta-section{
  padding-top: 52px;
}

.cta-card{
  padding: 28px;
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 20px;
  align-items: center;
}

.cta-copy h2{
  margin: 14px 0 12px;
  font-size: clamp(1.7rem, 2.6vw, 2.5rem);
}

.cta-box{
  padding: 22px;
  border-radius: 18px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
}

.check-list{
  margin: 0;
  padding-left: 1.1rem;
}

.check-list li{
  margin: 10px 0;
  color: rgba(234,242,255,.88);
}

.site-footer{
  padding: 28px 0 36px;
  border-top: 1px solid rgba(255,255,255,.08);
  background: rgba(4, 8, 16, .85);
}

.footer-wrap{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.footer-wrap p{
  margin: 8px 0 0;
  color: var(--muted-2);
}

.footer-links{
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links a{
  color: var(--muted);
}

.footer-links a:hover{
  color: #fff;
}

.bg-orb{
  position: fixed;
  border-radius: 50%;
  filter: blur(24px);
  opacity: .6;
  z-index: 0;
  pointer-events: none;
}

.orb-1{
  width: 340px;
  height: 340px;
  top: 70px;
  left: -120px;
  background: rgba(124,58,237,.15);
}

.orb-2{
  width: 420px;
  height: 420px;
  top: 220px;
  right: -180px;
  background: rgba(6,182,212,.12);
}

.grid-overlay{
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at center, black 35%, transparent 100%);
  opacity: .55;
}

/* Responsive */
@media (max-width: 1100px){
  .hero-grid,
  .cta-card{
    grid-template-columns: 1fr;
  }

  .grid-4{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3,
  .grid-5{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-stats{
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px){
  .nav-toggle{
    display: inline-block;
  }

  .site-nav{
    position: absolute;
    top: 76px;
    left: 16px;
    right: 16px;
    display: grid;
    gap: 0;
    padding: 10px;
    border-radius: 20px;
    background: rgba(7,11,22,.96);
    border: 1px solid rgba(255,255,255,.10);
    box-shadow: var(--shadow);
    transform-origin: top;
    transform: scaleY(0);
    opacity: 0;
    pointer-events: none;
    transition: .25s ease;
  }

  .site-nav.open{
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav a{
    padding: 14px 12px;
    border-radius: 12px;
  }

  .site-nav a::after{
    display: none;
  }

  .site-nav a:hover{
    background: rgba(255,255,255,.05);
  }

  .nav-wrap{
    position: relative;
  }

  .nav-actions{
    margin-left: auto;
  }

  .grid-4,
  .grid-3,
  .grid-5{
    grid-template-columns: 1fr;
  }

  .footer-wrap{
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 560px){
  .section{
    padding: 72px 0;
  }

  .nav-actions .btn-ghost{
    display: none;
  }

  .hero-actions{
    flex-direction: column;
  }

  .btn{
    width: 100%;
  }

  .card,
  .panel-card,
  .code-card,
  .cta-card{
    padding: 18px;
  }

  .faq-item summary{
    padding: 18px;
  }

  .faq-item .faq-content{
    padding: 0 18px 18px;
  }
}