:root{
  --bg:#030305; /* near-black */
  --card:#0c0c0c;
  --accent-start:#ffd75a; /* bright gold */
  --accent-mid:#ffbf00;   /* gold */
  --accent-end:#dca400;   /* deep gold */
  --muted:#c0c0c0;
  --glass: rgba(255, 255, 255, 0.03);
  --glow: 0 12px 40px rgba(255, 190, 30, 0.14);
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
  background:
    radial-gradient(900px 400px at 10% 8%, rgba(255,200,40,0.02), transparent),
    linear-gradient(180deg,#050506 0%, var(--bg) 100%);
  color:#fff;
  -webkit-font-smoothing:antialiased;
}
.wrap{
  max-width:980px;
  margin:48px auto;
  padding:22px;
}
.hero{ text-align:center; margin-bottom:18px }
.title{ font-weight:800; margin:0; font-size:44px; letter-spacing: -0.02em; color:var(--accent-mid); text-transform:uppercase }
.subtitle{ margin:8px 0 0; color:var(--muted); font-weight:400 }
.card{ background:linear-gradient(180deg,var(--card), #141414); border-radius:14px; padding:22px; margin:22px 0; box-shadow: 0 14px 48px rgba(0,0,0,0.65); border:1px solid rgba(255,200,30,0.06)}
.code-card{ background: linear-gradient(180deg,#0f0f0f,#141414); }
.label{ display:block; color:var(--muted); font-size:13px; margin-bottom:10px }
.row{ display:flex; gap:12px }
.input{ flex:1; padding:12px 14px; border-radius:10px; background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01)); border:1px solid rgba(255,255,255,0.04); color:#fff; outline:none }
.input::placeholder{ color:rgba(255,255,255,0.28) }
.btn{ padding:12px 16px; border-radius:12px; border:0; cursor:pointer; font-weight:700; letter-spacing:0.02em }
.btn-accent{
  color:#0b0b0b;
  background: linear-gradient(180deg, var(--accent-start), var(--accent-mid) 60%, var(--accent-end));
  box-shadow: 0 10px 30px rgba(220,164,0,0.12), inset 0 -4px 8px rgba(0,0,0,0.12);
  border: 1px solid rgba(0,0,0,0.12);
}
.btn-accent:hover{ transform: translateY(-3px); box-shadow: 0 18px 50px rgba(220, 209, 0, 0.996), inset 0 -4px 8px rgba(0,0,0,0.14); }
.btn-outline{ background:transparent; color:var(--accent-start); border:1px solid rgba(255,200,40,0.12) }
.status-row{ display:flex; justify-content:space-between; align-items:center; margin-top:12px }
.status{ font-size:13px; color:var(--muted) }
.output{ background:#070707; border-radius:10px; padding:18px; min-height:100px; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, 'Courier New', monospace; color:#ffefc2; margin-top:10px; white-space:pre-wrap; border:1px solid rgba(255,200,40,0.04) }
.code-block{ background:#070606; padding:12px; border-radius:8px; font-family: ui-monospace, Menlo, Monaco, monospace; color:#ffeaa7; overflow:auto }
.code-title{ margin:0 0 8px 0; color:var(--accent-mid); font-weight:700 }
.muted{ color:var(--muted); font-size:13px }
.footer{ text-align:center; color:var(--muted); margin-top:18px; font-size:13px }

@media (max-width:700px){ .row{ flex-direction:column } .title{ font-size:32px } }

/* Premium accents */
.card{ border-left:6px solid transparent; transition:transform .18s ease, box-shadow .18s ease, border-left-color .18s ease; }
.card:hover{ transform: translateY(-6px); box-shadow: var(--glow); border-left-color:var(--accent-mid); }
.btn-outline:hover{ background: linear-gradient(90deg, rgba(255, 201, 40, 0.896), rgba(255,200,40,0.02)); }
.input:focus{ box-shadow: 0 8px 30px rgba(255,200,40,0.06); border-color: rgba(255,200,40,0.16); }
.status{ display:inline-flex; align-items:center; gap:10px }
.status::before{ content:''; width:10px; height:10px; border-radius:50%; background:linear-gradient(180deg,var(--accent-start),var(--accent-end)); box-shadow: 0 2px 8px rgba(255,200,40,0.14); }

/* Navigation */
.nav{ display:inline-flex; gap:12px; margin-top:14px; justify-content:center }
.nav-link{ color:var(--muted); padding:8px 12px; border-radius:10px; text-decoration:none; font-weight:700 }
.nav-link:hover{ color:#0b0b0b; background: linear-gradient(90deg, rgba(255,200,40,0.14), rgba(255,200,40,0.04)); }
.nav-link.active, .nav-link[aria-current="page"]{ color:#0b0b0b; background:linear-gradient(180deg,var(--accent-start),var(--accent-mid)); box-shadow: 0 12px 40px rgba(220,164,0,0.14); }

/* small refinements */
.title{ text-shadow: 0 8px 28px rgba(220,164,0,0.08); }

/* Lesson button hover (yellow on hover) */
.lesson{ display:inline-block; padding:10px 14px; border-radius:10px; color:var(--muted); background:transparent; border:1px solid rgba(255,200,40,0.04); text-decoration:none; font-weight:700; transition: background .15s ease, color .15s ease, transform .12s ease; }
.lesson:hover, .lesson:focus{ color:#0b0b0b; background: linear-gradient(180deg,var(--accent-start),var(--accent-mid)); box-shadow: 0 12px 40px rgba(220,164,0,0.14); transform: translateY(-3px); }
.lesson:active{ transform: translateY(-1px); }

/* ensure buttons look elevated */
.btn{ transition: transform .14s ease, box-shadow .14s ease }