:root{
  --bg:#0b0c12;
  --panel:#111427;
  --card:#0f1222;
  --text:#f2f4ff;
  --muted:#a6adc1;
  --border:rgba(255,255,255,.10);
  --accent:#7c3aed;
  --accent2:#06b6d4;
  --radius:16px;
  --shadow:0 14px 40px rgba(0,0,0,.45);
  --max:1100px;
}

html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color:var(--text);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  background:
    radial-gradient(1200px 600px at 20% -10%, rgba(124,58,237,.35), transparent 60%),
    radial-gradient(900px 500px at 90% 0%, rgba(6,182,212,.25), transparent 55%),
    radial-gradient(900px 500px at 40% 110%, rgba(59,130,246,.18), transparent 55%),
    var(--bg);
}

/* Layout helpers */
main, .container{
  max-width:var(--max);
  margin:0 auto;
  padding:28px 18px;
}
header{
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter: blur(10px);
  background: rgba(11,12,18,.70);
  border-bottom: 1px solid var(--border);
}
header > *{
  max-width:var(--max);
  margin:0 auto;
  padding:14px 18px;
}
footer{
  max-width:var(--max);
  margin:0 auto;
  padding:24px 18px 40px;
  color:var(--muted);
}

/* Typography */
h1,h2,h3{
  letter-spacing:-0.02em;
  line-height:1.15;
}
h1{font-size:clamp(28px, 5vw, 52px)}
h2{font-size:clamp(22px, 3.2vw, 34px)}
p,li{color:rgba(242,244,255,.92)}
small,.muted{color:var(--muted)}

/* Links */
a{color:var(--accent2); text-decoration:none}
a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{
  outline: 3px solid rgba(6,182,212,.35);
  outline-offset: 2px;
  border-radius: 12px;
}

/* Nav */
nav a{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 10px;
  border-radius:12px;
}
nav a:hover{
  background: rgba(255,255,255,.06);
  text-decoration:none;
}

/* Cards/panels */
.card, section, article, .panel{
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card{padding:18px}
section, article{padding:18px}

/* Buttons */
button, .btn, a.btn, input[type="submit"], input[type="button"]{
  appearance:none;
  border:none;
  color:white;
  font-weight:800;
  padding:10px 14px;
  border-radius:12px;
  cursor:pointer;
  background: linear-gradient(135deg, var(--accent), #3b82f6);
  box-shadow: 0 10px 26px rgba(124,58,237,.22);
}
button:hover, .btn:hover, a.btn:hover, input[type="submit"]:hover{
  transform: translateY(-1px);
}
button.secondary, .btn.secondary, a.btn.secondary{
  background: rgba(255,255,255,.07);
  border:1px solid var(--border);
  box-shadow:none;
}
button:disabled, input:disabled{opacity:.6; cursor:not-allowed; transform:none}

/* Forms */
input, textarea, select{
  width:100%;
  max-width: 100%;
  box-sizing:border-box;
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 12px;
}
label{display:block;margin:10px 0 6px;color:var(--muted);font-weight:700}
textarea{min-height:120px;resize:vertical}

/* Tables */
table{width:100%; border-collapse:collapse}
th,td{padding:10px 8px;border-bottom:1px solid var(--border)}
th{color:var(--muted); text-align:left; font-weight:800}

/* Code blocks */
code,pre{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}
pre{
  padding:14px;
  overflow:auto;
  background: rgba(0,0,0,.35);
  border:1px solid var(--border);
  border-radius: 14px;
}

/* Responsive tweaks */
@media (max-width: 720px){
  header > *{padding:12px 14px}
  main,.container{padding:22px 14px}
  nav{overflow:auto; white-space:nowrap}
}

/* Light mode */
@media (prefers-color-scheme: light){
  :root{
    --bg:#f7f8ff;
    --panel:#ffffff;
    --card:#ffffff;
    --text:#101226;
    --muted:#475569;
    --border:rgba(2,6,23,.10);
    --shadow:0 14px 40px rgba(2,6,23,.10);
  }
  body{
    background:
      radial-gradient(900px 500px at 20% -10%, rgba(124,58,237,.16), transparent 60%),
      radial-gradient(700px 400px at 90% 0%, rgba(6,182,212,.12), transparent 55%),
      var(--bg);
  }
  header{background: rgba(247,248,255,.8)}
}