:root {
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-dark: #4f46e5;
  --color-bg: #0b0d1a;
  --color-bg-alt: #111327;
  --color-bg-card: rgba(255,255,255,0.06);
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-muted: #64748b;
  --color-accent: #22d3ee;
  --color-border: rgba(255,255,255,0.08);
  --color-success: #34d399;
  --color-warning: #fbbf24;
  --color-danger: #f87171;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", "Consolas", monospace;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-card: 0 4px 32px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 40px rgba(99,102,241,0.15);
  --max-width: 1200px;
  --nav-height: 72px;
}
/* fixed 3D particle background across entire viewport */
#particle-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:var(--color-bg);
  color:var(--color-text);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--color-primary-light);text-decoration:none;transition:color .2s}
a:hover{color:var(--color-accent)}
img{max-width:100%;height:auto;display:block}
/* navigation */
nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-height);
  background:rgba(11,13,26,0.75);
  backdrop-filter:blur(20px) saturate(1.5);
  -webkit-backdrop-filter:blur(20px) saturate(1.5);
  border-bottom:1px solid var(--color-border);
  transition:background .3s;
}
nav.scrolled{background:rgba(11,13,26,0.92)}
.nav-inner{
  max-width:var(--max-width);margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;
  height:100%;padding:0 24px;
}
.nav-logo{font-size:1.25rem;font-weight:700;color:var(--color-text);display:flex;align-items:center;gap:8px}
.nav-logo i{color:var(--color-primary-light)}
.nav-logo img{height:34px;width: auto;}
.nav-links{display:flex;align-items:center;gap:32px;list-style:none}
.nav-links a{color:var(--color-text-secondary);font-size:1.05rem;font-weight:500;transition:color .2s;position:relative}
.nav-links a:hover,.nav-links a.active{color:var(--color-text)}
.nav-links a.active::after{
  content:'';position:absolute;bottom:-4px;left:0;right:0;height:2px;
  background:var(--color-primary-light);border-radius:1px;
}
.nav-cta{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--color-primary);color:#fff;font-size:1rem;font-weight:600;
  padding:10px 22px;border-radius:100px;transition:background .2s,transform .2s;
}
.nav-cta:hover{background:var(--color-primary-dark);color:#fff;transform:translateY(-1px)}
.nav-toggle{display:none;background:none;border:none;color:var(--color-text);font-size:1.5rem;cursor:pointer;padding:4px}
/* dropdown */
.dropdown-parent{position:relative}
.dropdown li a::before{content:'';position:absolute;left:12px;top:50%;transform:translateY(-50%);width:5px;height:5px;border-radius:50%;background:linear-gradient(135deg,var(--color-primary-light),var(--color-accent));opacity:0;transition:opacity .3s ease,transform .3s cubic-bezier(.34,1.56,.64,1);transform:translateY(-50%) scale(0.4)}
.dropdown li a:hover::before{opacity:1;transform:translateY(-50%) scale(1)}
.dropdown li:first-child a{margin-top:6px}
.dropdown li:last-child a{margin-bottom:6px}
.dropdown-parent > a::after{content:'';display:inline-block;width:5px;height:5px;border-right:2px solid var(--color-text-secondary);border-bottom:2px solid var(--color-text-secondary);transform:rotate(45deg);margin-left:6px;margin-bottom:2px;transition:transform .3s cubic-bezier(.34,1.56,.64,1),border-color .2s ease}
.dropdown-parent:hover > a::after{transform:rotate(-135deg) translateY(-1px);border-color:var(--color-primary-light)}
.dropdown{display:block;position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%) translateY(-6px);background:rgba(17,19,39,0.96);backdrop-filter:blur(24px) saturate(1.6);-webkit-backdrop-filter:blur(24px) saturate(1.6);border:1px solid rgba(99,102,241,0.2);border-radius:14px;padding:6px 0;min-width:200px;list-style:none;z-index:200;box-shadow:0 16px 48px rgba(0,0,0,0.6),0 0 32px rgba(99,102,241,0.08),inset 0 1px 0 rgba(99,102,241,0.15);opacity:0;pointer-events:auto;visibility:hidden;transition:opacity .3s cubic-bezier(.34,1.56,.64,1),transform .35s cubic-bezier(.34,1.56,.64,1),visibility .3s ease}
.dropdown li a{display:block;padding:10px 22px;color:var(--color-text-secondary);font-size:0.95rem;white-space:nowrap;transition:background .25s cubic-bezier(.4,0,.2,1),color .25s ease,padding .25s cubic-bezier(.4,0,.2,1);border-radius:8px;margin:3px 8px;position:relative}
.dropdown li a:hover{background:rgba(99,102,241,0.12);color:var(--color-text);padding-left:30px;box-shadow:inset 0 0 0 1px rgba(99,102,241,0.08)}
.dropdown-parent:hover .dropdown,.dropdown-parent .dropdown:hover{opacity:1;transform:translateX(-50%) translateY(0);pointer-events:auto;visibility:visible}
@media(max-width:768px){
  .dropdown{position:static;transform:none;background:transparent;border:none;padding:0 0 0 16px;min-width:auto;box-shadow:none}
  .dropdown-parent:hover .dropdown{display:none}
  .dropdown.open{display:block}
}
/* buttons */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-sans);font-weight:600;font-size:1rem;
  padding:14px 32px;border-radius:100px;border:none;cursor:pointer;
  transition:all .3s;text-decoration:none;
}
.btn-primary{
  background:var(--color-primary);color:#fff;box-shadow:0 4px 20px rgba(99,102,241,0.3);
}
.btn-primary:hover{background:var(--color-primary-dark);transform:translateY(-2px);box-shadow:0 8px 30px rgba(99,102,241,0.35)}
.btn-secondary{
  background:rgba(255,255,255,0.06);color:var(--color-text);
  border:1px solid var(--color-border);
}
.btn-secondary:hover{background:rgba(255,255,255,0.1);border-color:var(--color-muted)}
.btn-ghost{
  color:var(--color-text-secondary);padding:14px 24px;font-weight:500;
}
.btn-ghost:hover{color:var(--color-text);background:rgba(255,255,255,0.04)}
/* section base */
section{padding:100px 24px}
.section-inner{max-width:var(--max-width);margin:0 auto}
.section-label{
  display:inline-block;
  font-size:0.8rem;font-weight:600;letter-spacing:0.08em;text-transform:uppercase;
  color:var(--color-primary-light);margin-bottom:12px;
}
.section-title{font-size:clamp(2rem,4vw,3.2rem);font-weight:800;line-height:1.15;letter-spacing:-0.02em}
.section-subtitle{font-size:1.1rem;color:var(--color-text-secondary);max-width:640px;margin-top:16px;line-height:1.7}
/* hero */
.hero{
  min-height:90vh;display:flex;align-items:center;
  padding-top:calc(var(--nav-height) + 40px);
  position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;top:-30%;right:-20%;width:60%;height:80%;
  background:radial-gradient(ellipse at center, rgba(99,102,241,0.08) 0%, transparent 70%);
  pointer-events:none;
}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.hero h1{font-size:clamp(2.6rem,5.5vw,4.5rem);font-weight:800;line-height:1.08;letter-spacing:-0.03em}
.hero h1 .highlight{background:linear-gradient(135deg,var(--color-primary-light),var(--color-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:1.15rem;color:var(--color-text-secondary);margin-top:20px;max-width:520px;line-height:1.7}
.hero-actions{display:flex;gap:12px;margin-top:32px;flex-wrap:wrap}
.hero-trust{font-size:0.85rem;color:var(--color-muted);margin-top:20px;display:flex;align-items:center;gap:8px}
.hero-trust i{color:var(--color-success);font-size:0.9rem}
.hero-visual{
  background:rgba(17,19,39,0.6);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border:1px solid var(--color-border);
  border-radius:var(--radius);
  padding:24px;
  position:relative;
  min-height:340px;
  display:flex;flex-direction:column;
  box-shadow:var(--shadow-glow);
}
.hero-visual-top{display:flex;gap:16px;flex:1}
.hero-visual-editor{
  flex:2;background:rgba(255,255,255,0.03);border-radius:var(--radius-sm);
  padding:16px;border:1px solid var(--color-border);
}
.hero-visual-editor .line{height:6px;background:rgba(255,255,255,0.06);border-radius:4px;margin-bottom:10px}
.hero-visual-editor .line:nth-child(1){width:80%}
.hero-visual-editor .line:nth-child(2){width:55%}
.hero-visual-editor .line:nth-child(3){width:70%}
.hero-visual-editor .line:nth-child(4){width:45%}
.hero-visual-editor .line:nth-child(5){width:65%}
.hero-visual-editor .line.highlight-line{background:linear-gradient(90deg,var(--color-primary),var(--color-accent));opacity:0.25}
.hero-visual-graph{
  flex:1;background:rgba(255,255,255,0.02);border-radius:var(--radius-sm);
  border:1px solid var(--color-border);display:flex;align-items:center;justify-content:center;
  position:relative;
}
.hero-visual-graph .dot{
  position:absolute;width:10px;height:10px;border-radius:50%;
  background:var(--color-primary-light);opacity:0.5;
}
.hero-visual-graph .dot:nth-child(1){top:30%;left:50%}
.hero-visual-graph .dot:nth-child(2){top:55%;left:25%}
.hero-visual-graph .dot:nth-child(3){top:55%;left:70%}
.hero-visual-graph .dot:nth-child(4){top:75%;left:50%}
.hero-visual-bottom{
  margin-top:16px;padding:14px 16px;
  background:rgba(255,255,255,0.03);border-radius:var(--radius-sm);
  border:1px solid var(--color-border);
  display:flex;align-items:center;gap:12px;
}
.hero-visual-bottom .bar{height:8px;background:rgba(255,255,255,0.06);border-radius:4px;flex:1}
/* feature cards */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}
.feature-card{
  background:rgba(255,255,255,0.04);backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border:1px solid var(--color-border);border-radius:var(--radius);
  padding:32px 28px;transition:all .4s;position:relative;overflow:hidden;
}
.feature-card:hover{transform:translateY(-6px);border-color:rgba(99,102,241,0.2);box-shadow:0 12px 40px rgba(0,0,0,0.2)}
.feature-card .icon{font-size:1.6rem;color:var(--color-primary-light);margin-bottom:16px}
.feature-card h3{font-size:1.1rem;font-weight:700;margin-bottom:10px}
.feature-card p{font-size:0.92rem;color:var(--color-text-secondary);line-height:1.6}
/* how it works */
.how-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:48px;position:relative}
.how-step{text-align:center;position:relative;background:rgba(255,255,255,0.04);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--color-border);border-radius:var(--radius);padding:40px 28px;}
.how-step .step-num{
  width:52px;height:52px;border-radius:50%;
  background:linear-gradient(135deg,var(--color-primary),var(--color-accent));
  display:flex;align-items:center;justify-content:center;
  font-size:1.2rem;font-weight:800;margin:0 auto 16px;
}
.how-step h3{font-size:1.1rem;font-weight:700;margin-bottom:8px}
.how-step p{font-size:0.9rem;color:var(--color-text-secondary)}
/* comparison table */
.comparison-table{width:100%;border-collapse:separate;border-spacing:0;margin-top:40px;border-radius:var(--radius-sm);overflow:hidden;border:1px solid var(--color-border)}
.comparison-table th,.comparison-table td{padding:16px 20px;text-align:left;border-bottom:1px solid var(--color-border);font-size:0.95rem}
.comparison-table th{background:rgba(99,102,241,0.08);font-weight:700;color:var(--color-text)}
.comparison-table td{color:var(--color-text-secondary)}
.comparison-table td:first-child{font-weight:600;color:var(--color-text);width:80px}
.comparison-table tr:last-child td{border-bottom:none}
.comparison-table .check{color:var(--color-success)}
.comparison-table .cross{color:var(--color-muted)}
/* template gallery */
.template-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px}
.template-card{
  background:rgba(255,255,255,0.04);backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border:1px solid var(--color-border);
  border-radius:var(--radius-sm);padding:24px;text-align:center;
  transition:all .3s;cursor:pointer;
}
.template-card:hover{transform:translateY(-4px);border-color:rgba(99,102,241,0.2)}
.template-card .icon-box{
  width:48px;height:48px;border-radius:12px;margin:0 auto 14px;
  background:rgba(99,102,241,0.1);display:flex;align-items:center;justify-content:center;
  font-size:1.3rem;color:var(--color-primary-light);
}
.template-card h4{font-size:0.95rem;font-weight:600;margin-bottom:4px}
.template-card p{font-size:0.82rem;color:var(--color-text-secondary)}
/* role cards */
.roles-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:40px}
.role-card{
  background:rgba(255,255,255,0.04);backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border:1px solid var(--color-border);
  border-radius:var(--radius);padding:32px;transition:all .3s;
}
.role-card:hover{border-color:rgba(99,102,241,0.2);transform:translateY(-3px)}
.role-card .role-icon{font-size:1.5rem;margin-bottom:10px}
.role-card h3{font-size:1.05rem;font-weight:700;margin-bottom:4px}
.role-card .role-tagline{font-size:0.85rem;color:var(--color-muted);margin-bottom:14px;font-style:italic}
.role-card ol{padding-left:18px;font-size:0.9rem;color:var(--color-text-secondary)}
.role-card ol li{margin-bottom:6px}
.role-card .role-quote{
  margin-top:14px;padding:12px 16px;background:rgba(99,102,241,0.06);
  border-left:3px solid var(--color-primary-light);border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  font-size:0.9rem;color:var(--color-text);font-weight:500;
}
/* start section */
.start-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.start-card{
  background:rgba(255,255,255,0.04);backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border:1px solid var(--color-border);
  border-radius:var(--radius);padding:32px;transition:all .3s;
}
.start-card:hover{transform:translateY(-4px);border-color:rgba(99,102,241,0.15)}
.start-card h3{font-size:1.05rem;font-weight:700;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.start-card h3 i{color:var(--color-primary-light)}
.start-card ul{list-style:none;padding:0}
.start-card ul li{padding:6px 0;font-size:0.9rem;color:var(--color-text-secondary);display:flex;align-items:flex-start;gap:6px}
.start-card ul li i{color:var(--color-success);font-size:0.8rem;margin-top:5px;flex-shrink:0}
/* foooter */
footer{
  position: relative;
  z-index: 2;
  border-top:1px solid var(--color-border);
  padding:60px 24px 40px;
}
.footer-inner{max-width:var(--max-width);margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px}
.footer-brand p{font-size:0.9rem;color:var(--color-text-secondary);margin-top:12px;max-width:300px}
.footer-brand .logo{font-size:1.2rem;font-weight:700;display:flex;align-items:center;gap:8px}
.footer-brand .logo i{color:var(--color-primary-light)}
.footer-brand .logo img{height:32px;width: auto;}
.footer-col h4{font-size:0.85rem;font-weight:600;color:var(--color-text);margin-bottom:16px;text-transform:uppercase;letter-spacing:0.05em}
.footer-col ul{list-style:none}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{font-size:0.9rem;color:var(--color-text-secondary)}
.footer-col ul a:hover{color:var(--color-text)}
.footer-bottom{
  max-width:var(--max-width);margin:40px auto 0;
  padding-top:24px;border-top:1px solid var(--color-border);
  display:flex;justify-content:space-between;align-items:center;
  font-size:0.85rem;color:var(--color-muted);
}
/* utility */
.text-center{text-align:center}
.mt-8{margin-top:8px}
.mt-16{margin-top:16px}
.mt-24{margin-top:24px}
.mt-32{margin-top:32px}
.mt-40{margin-top:40px}
.gradient-text{background:linear-gradient(135deg,var(--color-primary-light),var(--color-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
/* animation */
@keyframes fadeUp{
  from{opacity:0;transform:translateY(30px)}
  to{opacity:1;transform:translateY(0)}
}
.animate-in{animation:fadeUp .6s ease-out both}
.animate-in-d1{animation-delay:.1s}
.animate-in-d2{animation-delay:.2s}
.animate-in-d3{animation-delay:.3s}
.animate-in-d4{animation-delay:.4s}
.animate-in-d5{animation-delay:.5s}
/* responsive */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-visual{min-height:260px}
  .features-grid,.how-steps,.template-grid,.start-grid{grid-template-columns:1fr 1fr}
  .roles-grid{grid-template-columns:1fr}
  .nav-links{display:none}
  .nav-links.open{display:flex;flex-direction:column;position:absolute;top:var(--nav-height);left:0;right:0;
    background:rgba(11,13,26,0.98);backdrop-filter:blur(20px);padding:20px 24px;gap:16px;
    border-bottom:1px solid var(--color-border);
  }
  .nav-toggle{display:block}
  .footer-inner{grid-template-columns:1fr 1fr}
  .comparison-table{font-size:0.85rem}
  .comparison-table th,.comparison-table td{padding:12px 14px}
}
@media(max-width:600px){
  .features-grid,.how-steps,.template-grid,.start-grid{grid-template-columns:1fr}
  .hero h1{font-size:2rem}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%;justify-content:center}
  .footer-inner{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:12px;text-align:center}
  section{padding:64px 16px}
}