:root{
  --bg:#06111f;
  --bg-soft:#0a1628;
  --panel:#0d1a2e;
  --panel-2:#101f36;
  --border:#223554;
  --border-bright:#2f5f9f;
  --text:#f8fafc;
  --muted:#a9bad1;
  --blue:#2493ff;
  --blue-2:#2563eb;
  --cyan:#22d3ee;
  --green:#50e678;
  --purple:#a855f7;
  --orange:#f59e0b;
  --red:#ff4d5f;
  --yellow:#fbbf24;
  --shadow:0 18px 55px rgba(0,0,0,.32);
  --radius:18px;
  --container:min(1400px,92vw);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 78% 22%, rgba(37,99,235,.17), transparent 28%),
    radial-gradient(circle at 18% 42%, rgba(34,211,238,.06), transparent 34%),
    linear-gradient(180deg,#06111f 0%,#071321 55%,#06111f 100%);
  color:var(--text);
  min-height:100vh;
}
a{color:inherit}
img{max-width:100%}
button,input,textarea{font:inherit}
.site-header{
  position:sticky;top:0;z-index:30;
  backdrop-filter:blur(14px);
  background:rgba(6,17,31,.88);
  border-bottom:1px solid rgba(72,102,144,.25);
}
.header-inner{
  width:var(--container);margin:auto;
  min-height:80px;display:flex;align-items:center;justify-content:space-between;gap:28px;
}
.brand{
  display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:800;font-size:clamp(1.1rem,2vw,1.55rem);letter-spacing:.02em;
}
.brand img{width:42px;height:42px}
.brand span:last-child{color:var(--blue)}
.nav-toggle{display:none;border:1px solid var(--border);background:var(--panel);color:var(--text);border-radius:10px;padding:9px 12px}
.main-nav{display:flex;align-items:center;gap:34px}
.main-nav a{
  text-decoration:none;color:#d6e2f2;font-weight:600;position:relative;padding:28px 0;
}
.main-nav a:hover,.main-nav a.active{color:#fff}
.main-nav a.active::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:3px;border-radius:3px;background:var(--blue);
}
.contact-link{
  text-decoration:none;border:1px solid var(--blue);border-radius:12px;padding:12px 18px;font-weight:700;color:#fff;
}
.contact-link:hover{background:rgba(36,147,255,.1)}
.page-shell{width:var(--container);margin:auto}
.hero{
  display:grid;grid-template-columns:.9fr 1.1fr;gap:70px;align-items:center;padding:72px 0 46px;
}
.eyebrow{
  color:#50a9ff;font-size:.88rem;letter-spacing:.14em;font-weight:800;margin-bottom:22px;
}
.hero h1{font-size:clamp(3.2rem,7vw,6rem);line-height:1.02;margin:0 0 22px;letter-spacing:-.04em}
.hero h1 .accent{color:var(--blue)}
.hero-copy{font-size:1.18rem;line-height:1.72;color:#c6d4e8;max-width:650px}
.hero-actions{display:flex;gap:18px;flex-wrap:wrap;margin-top:28px}
.btn{
  display:inline-flex;align-items:center;gap:10px;padding:14px 22px;border-radius:12px;text-decoration:none;font-weight:800;border:1px solid var(--border);
}
.btn-primary{background:linear-gradient(135deg,var(--blue),#1f6fff);box-shadow:0 12px 30px rgba(36,147,255,.25)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-secondary{background:rgba(9,24,42,.65)}
.btn-secondary:hover{border-color:var(--blue)}
.terminal{
  border:1px solid #36537b;border-radius:18px;overflow:hidden;background:rgba(5,15,29,.88);box-shadow:var(--shadow);position:relative;
}
.terminal::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(90deg,transparent 0 10%,rgba(37,99,235,.035) 50%,transparent 90%);
}
.terminal-bar{height:48px;background:linear-gradient(180deg,#13233b,#0f1d31);display:flex;align-items:center;justify-content:space-between;padding:0 20px;border-bottom:1px solid rgba(255,255,255,.05)}
.dots{display:flex;gap:8px}.dot{width:13px;height:13px;border-radius:50%}.dot.red{background:#ff5f57}.dot.yellow{background:#febc2e}.dot.green{background:#28c840}
.terminal-title{font-family:"JetBrains Mono",monospace;color:#d7e2f5}
.terminal-body{padding:28px 34px 34px;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:1rem;line-height:2}
.prompt{color:#5df28b}.terminal-list{display:grid;grid-template-columns:150px 1fr;column-gap:28px}
.path{color:#35a8ff;font-weight:700}.terminal-desc{color:#bac7da}
.topic-grid{
  display:grid;grid-template-columns:repeat(6,1fr);gap:18px;padding:12px 0 36px;
}
.topic-card{
  border:1px solid var(--border);background:linear-gradient(180deg,rgba(13,26,46,.95),rgba(9,20,35,.95));
  border-radius:18px;padding:24px 18px;text-align:center;min-height:260px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  box-shadow:0 10px 24px rgba(0,0,0,.16);
}
.topic-card:hover{transform:translateY(-4px);border-color:var(--border-bright)}
.topic-icon{width:58px;height:58px;margin-bottom:18px}
.topic-card h3{font-size:1.25rem;margin:0 0 10px}
.topic-card p{color:var(--muted);line-height:1.5;min-height:48px;margin:0}
.status{
  margin-top:20px;border:1px solid currentColor;border-radius:10px;padding:7px 14px;font-size:.9rem;font-weight:800;background:rgba(255,255,255,.02)
}
.java{color:var(--red)} .networking{color:var(--cyan)} .linux{color:var(--green)} .security{color:var(--purple)} .ai{color:var(--orange)} .db{color:var(--yellow)}
.section-title{
  font-family:"JetBrains Mono",monospace;font-size:1rem;letter-spacing:.06em;color:#69b5ff;margin:18px 0;border-bottom:1px solid rgba(58,89,130,.35);padding-bottom:10px
}
.quick-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:18px;padding-bottom:42px}
.quick-card{
  text-decoration:none;border:1px solid var(--border);background:rgba(11,25,43,.88);border-radius:12px;padding:18px 16px;display:flex;align-items:center;justify-content:center;gap:10px;font-weight:700
}
.quick-card:hover{border-color:var(--blue);background:rgba(18,40,67,.95)}
.footer-quote{text-align:center;border-top:1px solid rgba(55,85,125,.25);padding:24px 0 38px;color:#c7d4e7}.footer-quote span{color:var(--blue)}
.page-hero{padding:70px 0 28px}
.page-hero h1{font-size:clamp(2.5rem,5vw,4.5rem);margin:0 0 12px}
.page-hero p{color:var(--muted);font-size:1.1rem;max-width:760px;line-height:1.7}
.content-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;padding:22px 0 62px}
.content-card{background:linear-gradient(180deg,rgba(15,31,54,.97),rgba(9,20,35,.97));border:1px solid var(--border);border-radius:16px;padding:24px}
.content-card h3{margin:0 0 10px}.content-card p{color:var(--muted);line-height:1.65}
.content-card .badge{display:inline-block;margin-top:10px;padding:6px 10px;border:1px solid #3569a5;border-radius:999px;color:#7fc0ff;font-size:.85rem}
.notice{border:1px solid #2e4d74;background:rgba(15,34,58,.82);border-radius:14px;padding:20px;margin:18px 0 46px;color:#c4d1e4}
.contact-form{display:grid;gap:16px;max-width:720px;padding-bottom:60px}
.contact-form label{font-weight:700}
.contact-form input,.contact-form textarea{
  width:100%;background:#0b182a;border:1px solid var(--border);border-radius:10px;color:#fff;padding:14px
}
.contact-form textarea{min-height:160px;resize:vertical}
.site-footer{border-top:1px solid rgba(58,89,130,.35);padding:28px 0;color:#8fa3bc}
.footer-inner{width:var(--container);margin:auto;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
@media(max-width:1150px){
  .topic-grid,.quick-grid{grid-template-columns:repeat(3,1fr)}
  .hero{grid-template-columns:1fr;gap:38px}
  .content-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:820px){
  .nav-toggle{display:block}
  .main-nav{display:none;position:absolute;top:80px;left:4vw;right:4vw;flex-direction:column;gap:0;background:#091628;border:1px solid var(--border);border-radius:14px;padding:8px}
  .main-nav.open{display:flex}
  .main-nav a{width:100%;padding:14px 16px}
  .main-nav a.active::after{display:none}
  .contact-link{display:none}
  .hero{padding-top:42px}
  .terminal-list{grid-template-columns:1fr;row-gap:2px;margin-bottom:10px}
  .terminal-body{padding:22px}
}
@media(max-width:640px){
  .topic-grid,.quick-grid,.content-grid{grid-template-columns:1fr}
  .topic-card{min-height:210px}
  .hero h1{font-size:3.3rem}
  .header-inner{min-height:72px}
  .brand img{width:36px;height:36px}
  .page-shell{width:min(92vw,100%)}
}