:root {
  --bg:          #09090b;
  --bg-sub:      #0f0f12;
  --surface:     #141419;
  --surface-2:   #1a1a22;
  --border:      #23232e;
  --border-h:    #2e2e3a;

  --text:        #ececf1;
  --text-2:      #a1a1aa;
  --text-3:      #71717a;

  --accent:      #3b82f6;
  --accent-h:    #2563eb;
  --accent-glow: rgba(59,130,246,.15);
  --green:       #22c55e;
  --green-glow:  rgba(34,197,94,.15);
  --yellow:       #f59e0b;
  --yellow-glow:  rgba(245,158,11,.15);
  --red:         #ef4444;
  --purple:      #a855f7;
  --purple-glow: rgba(168,85,247,.15);

  --radius:      14px;
  --radius-sm:   10px;
  --ease:        cubic-bezier(.4,0,.2,1);
  --dur:         .22s;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}

body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

a{color:var(--accent);text-decoration:none;transition:color var(--dur) var(--ease)}
a:hover{color:var(--accent-h)}

.glow{
  position:fixed;inset:0;pointer-events:none;z-index:0;
  background:
    radial-gradient(ellipse 700px 500px at 20% 0%,rgba(59,130,246,.07),transparent),
    radial-gradient(ellipse 600px 400px at 80% 90%,rgba(139,92,246,.05),transparent);
}

.intro{
  position:relative;z-index:1;
  text-align:center;
  padding:100px 24px 72px;
  max-width:720px;margin:0 auto;
}

.intro-badge{
  display:inline-block;
  font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;
  color:var(--accent);
  background:var(--accent-glow);
  border:1px solid rgba(59,130,246,.2);
  padding:6px 16px;border-radius:999px;
  margin-bottom:28px;
}

.intro h1{
  font-size:clamp(2.2rem,5vw,3.4rem);
  font-weight:800;letter-spacing:-.03em;
  line-height:1.1;margin-bottom:20px;
}

.intro-sub{
  font-size:1.1rem;color:var(--text-2);
  max-width:560px;margin:0 auto 36px;
}

.intro-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.9rem;font-weight:600;
  padding:12px 26px;border-radius:var(--radius-sm);
  transition:all var(--dur) var(--ease);
  cursor:pointer;border:none;text-decoration:none;
}
.btn-primary{
  background:var(--accent);color:#fff;
  box-shadow:0 0 20px rgba(59,130,246,.25);
}
.btn-primary:hover{background:var(--accent-h);color:#fff;box-shadow:0 0 30px rgba(59,130,246,.35)}
.btn-ghost{
  background:var(--surface);color:var(--text);
  border:1px solid var(--border);
}
.btn-ghost:hover{border-color:var(--border-h);background:var(--surface-2);color:var(--text)}

.container{
  position:relative;z-index:1;
  max-width:860px;margin:0 auto;
  padding:0 24px 80px;
}

.section{margin-top:72px}
.section-title{
  font-size:1.65rem;font-weight:700;letter-spacing:-.02em;
  margin-bottom:6px;
}
.section-sub{color:var(--text-2);margin-bottom:32px}

.features{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:16px;
}

.feature-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px 24px;
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.feature-card:hover{border-color:var(--border-h);transform:translateY(-2px)}

.feature-icon{
  width:44px;height:44px;border-radius:12px;
  display:grid;place-items:center;
  margin-bottom:16px;
}
.feature-icon.accent {background:var(--accent-glow);color:var(--accent);border:1px solid rgba(59,130,246,.18)}
.feature-icon.green  {background:var(--green-glow);color:var(--green);border:1px solid rgba(34,197,94,.18)}
.feature-icon.yellow  {background:var(--yellow-glow);color:var(--yellow);border:1px solid rgba(245,158,11,.18)}
.feature-icon.purple {background:var(--purple-glow);color:var(--purple);border:1px solid rgba(168,85,247,.18)}

.feature-card h3{
  font-size:1rem;font-weight:600;margin-bottom:6px;color:var(--text);
  text-transform:none;letter-spacing:normal;
}
.feature-card p{font-size:.875rem;color:var(--text-2);line-height:1.55}

.diagram{
  display:flex;align-items:center;justify-content:center;
  gap:16px;flex-wrap:wrap;
  margin-top:24px;
}

.diagram-node{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:20px 28px;text-align:center;
  min-width:160px;
  transition:border-color var(--dur) var(--ease);
}
.diagram-node.highlight{
  border-color:rgba(59,130,246,.35);
  box-shadow:0 0 24px rgba(59,130,246,.08);
}
.diagram-label{display:block;font-weight:600;font-size:.95rem;margin-bottom:2px}
.diagram-detail{font-size:.78rem;color:var(--text-3)}
.diagram-arrow{font-size:1.4rem;color:var(--text-3);flex-shrink:0}

.card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  margin-bottom:16px;
  overflow:hidden;
  transition:border-color var(--dur) var(--ease);
}
.card:hover{border-color:var(--border-h)}

.card-header{
  display:flex;align-items:center;gap:14px;
  padding:20px 24px;
  border-bottom:1px solid var(--border);
  background:var(--bg-sub);
}
.card-header h3{
  font-size:1.05rem;font-weight:600;color:var(--text);
  text-transform:none;letter-spacing:normal;
}

.step-badge{
  width:32px;height:32px;border-radius:50%;flex-shrink:0;
  background:var(--accent-glow);
  border:1px solid rgba(59,130,246,.25);
  color:var(--accent);font-weight:700;font-size:.85rem;
  display:grid;place-items:center;
}

.card-body{padding:20px 24px}
.card-body p{color:var(--text-2);font-size:.92rem;margin-bottom:12px}
.card-body p:last-child{margin-bottom:0}
.card-body ul{
  list-style:none;padding-left:0;
  color:var(--text-2);font-size:.92rem;
}
.card-body li{
  padding:6px 0 6px 20px;
  position:relative;
}
.card-body li::before{
  content:'';position:absolute;left:0;top:14px;
  width:6px;height:6px;border-radius:50%;
  background:var(--accent);opacity:.6;
}

.note{
  font-size:.84rem !important;
  color:var(--text-3) !important;
  background:var(--surface-2);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:12px 16px;
  margin-top:4px;
}

.tag{
  display:inline-block;
  font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;
  background:var(--yellow-glow);color:var(--yellow);
  border:1px solid rgba(245,158,11,.2);
  padding:2px 10px;border-radius:999px;
  vertical-align:middle;margin-left:4px;
}

.req-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:16px;margin-bottom:16px;
}
.req-item{
  background:var(--surface-2);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:16px 18px;
}
.req-item h4{font-size:.9rem;font-weight:600;margin-bottom:4px;color:var(--text)}
.req-item p{font-size:.84rem;color:var(--text-2);margin-bottom:0 !important}

.pin-table{
  width:100%;border-collapse:collapse;
  margin-top:12px;font-size:.88rem;
}
.pin-table th{
  text-align:left;padding:10px 16px;
  font-weight:600;font-size:.78rem;
  text-transform:uppercase;letter-spacing:.05em;
  color:var(--text-3);
  border-bottom:1px solid var(--border);
}
.pin-table td{
  padding:10px 16px;
  border-bottom:1px solid var(--border);
  color:var(--text-2);
}
.pin-table tr:last-child td{border-bottom:none}
.pin-table tbody tr:hover td{background:var(--surface-2)}

.code-block{
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:16px 20px;
  font-family:'SF Mono','Cascadia Code','Consolas',monospace;
  font-size:.82rem;line-height:1.8;
  color:var(--text-2);
  margin-top:12px;overflow-x:auto;
}
.code-comment{color:var(--text-3)}
.code-prompt{color:var(--accent);font-weight:600;margin-right:6px}
code{
  font-family:'SF Mono','Cascadia Code','Consolas',monospace;
  font-size:.82em;
  background:var(--surface-2);padding:2px 7px;border-radius:5px;
  color:var(--accent);
}

.faq{display:flex;flex-direction:column;gap:8px}

details{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  transition:border-color var(--dur) var(--ease);
}
details:hover{border-color:var(--border-h)}
details[open]{border-color:rgba(59,130,246,.25)}

summary{
  padding:16px 20px;
  font-weight:600;font-size:.92rem;
  cursor:pointer;list-style:none;
  display:flex;align-items:center;gap:10px;
  user-select:none;
}
summary::before{
  content:'';
  width:20px;height:20px;flex-shrink:0;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' fill='none' stroke='%23a1a1aa' stroke-width='2'%3E%3Cpath d='M7 8l3 3 3-3'/%3E%3C/svg%3E") center/contain no-repeat;
  transition:transform var(--dur) var(--ease);
}
details[open] summary::before{transform:rotate(180deg)}
summary::-webkit-details-marker{display:none}

details p{
  padding:0 20px 16px;
  font-size:.88rem;color:var(--text-2);
}

.footer{
  position:relative;z-index:1;
  text-align:center;
  padding:48px 24px 56px;
  border-top:1px solid var(--border);
  color:var(--text-3);font-size:.84rem;
}
.footer-links{margin-top:10px}
.footer-links a{color:var(--text-2);font-weight:500}
.footer-links a:hover{color:var(--accent)}
.dot{margin:0 8px;opacity:.4}

@media(max-width:600px){
  .intro{padding:64px 20px 48px}
  .intro h1{font-size:2rem}
  .diagram{flex-direction:column}
  .diagram-arrow{transform:rotate(90deg)}
  .container{padding:0 16px 60px}
  .card-header,.card-body{padding:16px 18px}
  .req-grid{grid-template-columns:1fr}
}