/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg: #090c10;
  --bg-card: #0d1117;
  --bg-card-hover: #161b22;
  --border: #21262d;
  --text: #c9d1d9;
  --text-muted: #8b949e;
  --text-bright: #f0f6fc;
  --accent: #58a6ff;
  --accent-light: #79c0ff;
  --accent-dark: #388bfd;
  --accent-blue: #58a6ff;
  --accent-purple: #d2a8ff;
  --accent-orange: #f0883e;
  --accent-red: #f85149;
  --accent-green: #3fb950;
  --accent-pink: #f778ba;
  --white: #ffffff;
  --success: #3fb950;
  --danger: #f85149;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow: 0 16px 48px rgba(0,0,0,.4);
  --shadow-sm: 0 4px 12px rgba(0,0,0,.25);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 0.2s ease;
  --gradient-brand: linear-gradient(135deg, #58a6ff 0%, #d2a8ff 50%, #f778ba 100%);
}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
a{color:var(--accent);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--accent-light)}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 1.5rem}
.text-muted{color:var(--text-muted)}
.text-accent{color:var(--accent-blue)}
.text-green{color:var(--accent-green)}
.text-purple{color:var(--accent-purple)}
.text-orange{color:var(--accent-orange)}
.text-pink{color:var(--accent-pink)}
.mt-2{margin-top:1rem}
.mt-3{margin-top:1.5rem}
.mt-4{margin-top:2rem}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.625rem 1.25rem;border-radius:var(--radius-sm);
  font-family:var(--font);font-size:.875rem;font-weight:600;
  border:none;cursor:pointer;transition:all var(--transition);
  text-decoration:none;line-height:1.4;
}
.btn-primary{background:var(--accent);color:#090c10}
.btn-primary:hover{background:var(--accent-light);color:#090c10}
.btn-secondary{background:var(--bg-card);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--bg-card-hover);border-color:var(--text-muted)}
.btn-ghost{background:transparent;color:var(--text-muted)}
.btn-ghost:hover{color:var(--text-bright);background:rgba(255,255,255,.05)}
.btn-lg{padding:.75rem 2rem;font-size:1rem}
.btn-gradient{background:var(--gradient-brand);color:#090c10;font-weight:700}
.btn-gradient:hover{opacity:.9}

/* ===== Navbar ===== */
.navbar{
  position:sticky;top:0;z-index:100;
  background:rgba(9,12,16,.85);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
  padding:0 1.5rem;height:64px;
}
.navbar .container{
  display:flex;align-items:center;justify-content:space-between;
  height:100%;max-width:1200px;margin:0 auto;padding:0;
}
.nav-brand{
  display:flex;align-items:center;gap:.625rem;
  font-size:1.125rem;font-weight:700;color:var(--text-bright);
  text-decoration:none;
}
.nav-brand svg{width:28px;height:28px;flex-shrink:0}
.nav-brand:hover{color:var(--text-bright)}
.nav-links{
  display:flex;align-items:center;gap:.25rem;
  list-style:none;margin:0;padding:0;
}
.nav-links a{
  padding:.5rem .75rem;border-radius:var(--radius-xs);
  font-size:.8125rem;font-weight:500;color:var(--text-muted);
  transition:all var(--transition);text-decoration:none;
}
.nav-links a:hover{color:var(--text-bright);background:rgba(255,255,255,.05)}
.nav-links a.active{color:var(--accent);background:rgba(88,166,255,.08)}
.nav-chat-btn{
  background:rgba(88,166,255,.1)!important;
  border:1px solid rgba(88,166,255,.25)!important;
  color:var(--accent)!important;
}
.nav-chat-btn:hover{background:rgba(88,166,255,.2)!important}
.nav-toggle{
  display:none;background:none;border:none;color:var(--text-muted);
  cursor:pointer;padding:.5rem;
}
.nav-toggle:hover{color:var(--text-bright)}

/* ===== Page Header ===== */
.page-header{
  padding:4rem 0 3rem;
  border-bottom:1px solid var(--border);
  position:relative;
}
.page-header::before{
  content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:800px;height:300px;
  background:radial-gradient(ellipse, rgba(88,166,255,.06) 0%, transparent 70%);
  pointer-events:none;
}
.section-label{
  display:inline-block;
  font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;
  color:var(--accent);margin-bottom:.75rem;
}
.page-header h1{
  font-size:2.75rem;font-weight:800;letter-spacing:-.03em;
  color:var(--text-bright);margin-bottom:.75rem;
}
.page-header p{
  font-size:1.125rem;color:var(--text-muted);max-width:640px;line-height:1.7;
}

/* ===== Page Layout (sidebar + content) ===== */
.page-layout{
  display:grid;grid-template-columns:220px 1fr;gap:3rem;
  padding:3rem 0 5rem;
}
.sidebar{position:sticky;top:80px;align-self:start}
.sidebar ul{list-style:none;padding:0;display:flex;flex-direction:column;gap:.25rem}
.sidebar a{
  display:block;padding:.5rem .75rem;border-radius:var(--radius-xs);
  font-size:.8125rem;font-weight:500;color:var(--text-muted);
  transition:all var(--transition);border-left:2px solid transparent;
  text-decoration:none;
}
.sidebar a:hover{color:var(--text-bright);background:rgba(255,255,255,.03);border-left-color:var(--border)}
.sidebar a.active{color:var(--accent);border-left-color:var(--accent);background:rgba(88,166,255,.05)}

/* ===== Cards ===== */
.card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.5rem;
  transition:border-color var(--transition);
}
.card:hover{border-color:rgba(88,166,255,.3)}
.card h3{font-size:1rem;font-weight:600;color:var(--text-bright);margin-bottom:.5rem}
.card p{font-size:.875rem;color:var(--text-muted);line-height:1.6}
.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}
.card-icon{
  width:40px;height:40px;border-radius:var(--radius-xs);
  display:flex;align-items:center;justify-content:center;
  margin-bottom:.75rem;font-size:1.125rem;
}
.card-icon.blue{background:rgba(88,166,255,.1);color:var(--accent-blue)}
.card-icon.green{background:rgba(63,185,80,.1);color:var(--accent-green)}
.card-icon.purple{background:rgba(210,168,255,.1);color:var(--accent-purple)}
.card-icon.orange{background:rgba(240,136,62,.1);color:var(--accent-orange)}

/* Grid helpers */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem}

/* ===== Feature List ===== */
.feature-list{list-style:none;padding:0;display:flex;flex-direction:column;gap:.625rem}
.feature-list li{display:flex;align-items:flex-start;gap:.625rem;font-size:.9375rem}
.feature-check{
  color:var(--accent-green);font-weight:700;flex-shrink:0;
  width:20px;text-align:center;
}

/* ===== Code Block ===== */
.code-block{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
}
.code-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:.75rem 1rem;border-bottom:1px solid var(--border);
  font-size:.8125rem;font-weight:600;color:var(--text-muted);
}
.code-block pre{
  padding:1rem 1.25rem;font-family:var(--font-mono);font-size:.8125rem;
  line-height:1.7;overflow-x:auto;color:var(--text);
}
.code-block .cmt{color:var(--text-muted)}
.code-block .str{color:var(--accent-green)}
.code-block .kw{color:var(--accent-purple)}
.tag{
  display:inline-flex;padding:.125rem .5rem;border-radius:10px;
  font-size:.6875rem;font-weight:600;text-transform:uppercase;letter-spacing:.03em;
}
.tag-green{background:rgba(63,185,80,.12);color:var(--accent-green)}
.tag-blue{background:rgba(88,166,255,.12);color:var(--accent-blue)}
.tag-purple{background:rgba(210,168,255,.12);color:var(--accent-purple)}
.tag-orange{background:rgba(240,136,62,.12);color:var(--accent-orange)}

/* ===== Data Table ===== */
.data-table{
  width:100%;border-collapse:collapse;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
}
.data-table th{
  text-align:left;padding:.75rem 1rem;
  font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;
  color:var(--text-muted);background:var(--bg-card-hover);
  border-bottom:1px solid var(--border);
}
.data-table td{
  padding:.75rem 1rem;font-size:.875rem;
  border-bottom:1px solid var(--border);
}
.data-table tr:last-child td{border-bottom:none}
.data-table code{
  font-family:var(--font-mono);font-size:.8125rem;
  background:rgba(88,166,255,.08);color:var(--accent);
  padding:.125rem .375rem;border-radius:4px;
}

/* ===== Arch Diagram ===== */
.arch-diagram{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:2rem;
  display:flex;justify-content:center;
}

/* ===== Accordion ===== */
.accordion{display:flex;flex-direction:column;gap:.5rem}
.accordion-item{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-sm);overflow:hidden;
}
.accordion-btn{
  width:100%;display:flex;align-items:center;justify-content:space-between;
  padding:1rem 1.25rem;background:none;border:none;
  font-family:var(--font);font-size:.9375rem;font-weight:600;
  color:var(--text-bright);cursor:pointer;
  transition:background var(--transition);
}
.accordion-btn:hover{background:rgba(255,255,255,.02)}
.accordion-btn svg{
  transition:transform var(--transition);color:var(--text-muted);
}
.accordion-item.open .accordion-btn svg{transform:rotate(180deg)}
.accordion-body{
  max-height:0;overflow:hidden;
  transition:max-height .3s ease, padding .3s ease;
}
.accordion-item.open .accordion-body{
  max-height:600px;padding:0 1.25rem 1rem;
}

/* ===== Tabs ===== */
.tabs{
  display:flex;gap:.25rem;margin-bottom:1rem;
  border-bottom:1px solid var(--border);padding-bottom:.5rem;
}
.tab-btn{
  padding:.5rem 1rem;border:none;background:none;
  font-family:var(--font);font-size:.8125rem;font-weight:500;
  color:var(--text-muted);cursor:pointer;
  border-radius:var(--radius-xs);transition:all var(--transition);
}
.tab-btn:hover{color:var(--text-bright);background:rgba(255,255,255,.03)}
.tab-btn.active{color:var(--accent);background:rgba(88,166,255,.08)}
.tab-panel{display:none}
.tab-panel.active{display:block}

/* ===== HOME PAGE ===== */
.home-hero{
  text-align:center;padding:5rem 1.5rem 4rem;
  position:relative;overflow:hidden;
}
.home-hero::before{
  content:'';position:absolute;top:-50%;left:50%;transform:translateX(-50%);
  width:1000px;height:600px;
  background:radial-gradient(ellipse, rgba(88,166,255,.08) 0%, transparent 70%);
  pointer-events:none;
}
.home-hero .hero-badge{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.375rem 1rem;border-radius:20px;
  background:rgba(88,166,255,.08);border:1px solid rgba(88,166,255,.2);
  color:var(--accent);font-size:.8125rem;font-weight:500;
  margin-bottom:1.5rem;
}
.home-hero h1{
  font-size:3.5rem;font-weight:800;letter-spacing:-.03em;
  color:var(--text-bright);margin-bottom:1rem;
  max-width:800px;margin-left:auto;margin-right:auto;line-height:1.1;
}
.gradient-text{
  background:var(--gradient-brand);-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.home-hero p{
  font-size:1.125rem;color:var(--text-muted);max-width:600px;
  margin:0 auto 2.5rem;line-height:1.7;
}
.hero-actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}

/* Home sections */
.home-section{padding:4rem 0}
.home-section.alt{background:var(--bg-card)}
.section-header{text-align:center;margin-bottom:3rem}
.section-header h2{font-size:2rem;font-weight:700;color:var(--text-bright);margin-bottom:.5rem}
.section-header p{color:var(--text-muted);font-size:1.0625rem;max-width:560px;margin:0 auto}

/* Architecture Flow */
.arch-flow{
  display:flex;flex-direction:column;align-items:center;gap:.25rem;
  max-width:600px;margin:0 auto;
}
.arch-flow-layer{
  display:flex;align-items:center;gap:1rem;
  width:100%;padding:1rem 1.5rem;
  border-radius:var(--radius-sm);border:1px solid var(--border);
  background:var(--bg-card);transition:border-color var(--transition);
}
.arch-flow-layer:hover{border-color:rgba(255,255,255,.15)}
.arch-flow-layer.blue{border-left:3px solid var(--accent-blue)}
.arch-flow-layer.green{border-left:3px solid var(--accent-green)}
.arch-flow-layer.purple{border-left:3px solid var(--accent-purple)}
.arch-flow-layer.orange{border-left:3px solid var(--accent-orange)}
.arch-flow-layer.pink{border-left:3px solid var(--accent-pink)}
.arch-flow-num{
  width:36px;height:36px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:.75rem;font-weight:700;color:var(--text-bright);
  background:rgba(255,255,255,.05);flex-shrink:0;
}
.arch-flow-content h3{font-size:.9375rem;font-weight:600;color:var(--text-bright);margin-bottom:.125rem}
.arch-flow-content p{font-size:.8125rem;color:var(--text-muted);margin:0}
.arch-flow-arrow{padding:.25rem 0;color:var(--text-muted)}
.arch-flow-split{
  display:grid;grid-template-columns:1fr 1fr;gap:.75rem;width:100%;
}

/* Pipeline Grid */
.pipeline-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem;
}
.pipeline-card{
  background:var(--bg);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.5rem;
  transition:border-color var(--transition);
}
.pipeline-card:hover{border-color:var(--accent)}
.pipeline-num{
  font-size:2rem;font-weight:800;
  background:var(--gradient-brand);-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;margin-bottom:.75rem;
}
.pipeline-card h3{font-size:1rem;font-weight:600;color:var(--text-bright);margin-bottom:.5rem}
.pipeline-card p{font-size:.8125rem;color:var(--text-muted);line-height:1.6}

/* Additions Grid */
.additions-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;
}
.addition-item{
  display:flex;gap:1rem;align-items:flex-start;
  padding:1.25rem;background:var(--bg-card);
  border:1px solid var(--border);border-radius:var(--radius-sm);
  transition:border-color var(--transition);
}
.addition-item:hover{border-color:rgba(88,166,255,.3)}
.addition-icon{
  width:40px;height:40px;border-radius:var(--radius-xs);
  display:flex;align-items:center;justify-content:center;
  font-size:1.125rem;flex-shrink:0;
}
.addition-icon.blue{background:rgba(88,166,255,.1)}
.addition-icon.green{background:rgba(63,185,80,.1)}
.addition-icon.purple{background:rgba(210,168,255,.1)}
.addition-icon.orange{background:rgba(240,136,62,.1)}
.addition-item h4{font-size:.9375rem;font-weight:600;color:var(--text-bright);margin-bottom:.25rem}
.addition-item p{font-size:.8125rem;color:var(--text-muted);line-height:1.5}

/* Nav Cards */
.nav-cards{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem;
}
.nav-card{
  display:block;padding:1.5rem;
  background:var(--bg);border:1px solid var(--border);
  border-radius:var(--radius);text-decoration:none;
  transition:all var(--transition);
}
.nav-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.nav-card-icon{
  width:48px;height:48px;border-radius:var(--radius-sm);
  display:flex;align-items:center;justify-content:center;
  margin-bottom:1rem;
}
.nav-card-icon.blue{background:rgba(88,166,255,.1);color:var(--accent-blue)}
.nav-card-icon.green{background:rgba(63,185,80,.1);color:var(--accent-green)}
.nav-card-icon.purple{background:rgba(210,168,255,.1);color:var(--accent-purple)}
.nav-card-icon.orange{background:rgba(240,136,62,.1);color:var(--accent-orange)}
.nav-card-icon.pink{background:rgba(247,120,186,.1);color:var(--accent-pink)}
.nav-card h3{font-size:1.0625rem;font-weight:600;color:var(--text-bright);margin-bottom:.375rem}
.nav-card p{font-size:.8125rem;color:var(--text-muted);line-height:1.6}

/* Footer */
.site-footer{
  border-top:1px solid var(--border);
  padding:2rem 0;text-align:center;
  color:var(--text-muted);font-size:.8125rem;
}

/* ===== Animations ===== */
.fade-in{opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}
.stagger{opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}
.stagger.visible{opacity:1;transform:translateY(0)}

/* ===== RESPONSIVE ===== */
@media(max-width:1024px){
  .page-layout{grid-template-columns:1fr}
  .sidebar{display:none}
  .pipeline-grid{grid-template-columns:repeat(2,1fr)}
  .nav-cards{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-links{
    display:none;flex-direction:column;
    position:absolute;top:64px;left:0;right:0;
    background:var(--bg-card);border-bottom:1px solid var(--border);
    padding:1rem;gap:.5rem;z-index:99;
  }
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .home-hero h1{font-size:2.25rem}
  .page-header h1{font-size:2rem}
  .hero-actions{flex-direction:column;align-items:center}
  .card-grid{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .additions-grid{grid-template-columns:1fr}
  .pipeline-grid{grid-template-columns:1fr}
  .nav-cards{grid-template-columns:1fr}
  .arch-flow-split{grid-template-columns:1fr}
}
@media(max-width:480px){
  .home-hero h1{font-size:1.75rem}
  .home-hero p{font-size:1rem}
  .container{padding:0 1rem}
}