@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&family=Inter:wght@400;600;700;900&display=swap');

:root {
  --bg: #0a0a1a;
  --bg-card: #12122a;
  --bg-elevated: #1a1a3a;
  --text: #e0e0f0;
  --text-muted: #8888aa;
  --border: #2a2a4a;
  --cyan: #00d4ff;
  --green: #00ff88;
  --purple: #a855f7;
  --pink: #f472b6;
  --orange: #f59e0b;
  --red: #ef4444;
  --blue: #3b82f6;
  --gradient-main: linear-gradient(135deg, #00d4ff, #a855f7);
  --gradient-warm: linear-gradient(135deg, #f59e0b, #ef4444);
  --transition: all 0.2s ease;
  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* NAV */
.topnav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,26,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
}
.topnav-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}
.topnav-brand {
  font-weight: 900; font-size: 18px; color: var(--cyan); text-decoration: none;
  display: flex; align-items: center; gap: 8px;
}
.topnav-links { display: flex; gap: 6px; flex-wrap: wrap; }
.topnav-link {
  color: var(--text-muted); text-decoration: none; font-size: 13px; font-weight: 600;
  padding: 5px 10px; border-radius: 8px; transition: var(--transition);
}
.topnav-link:hover, .topnav-link.active { color: var(--cyan); background: rgba(0,212,255,.08); }

/* CONTAINER */
.container { max-width: 1000px; margin: 0 auto; padding: 24px 16px 80px; }

/* HERO */
.hero {
  text-align: center; padding: 60px 20px 40px;
  background: radial-gradient(ellipse at 50% 0%, rgba(0,212,255,.08) 0%, transparent 70%);
}
.hero-badge {
  display: inline-block; padding: 4px 14px; border-radius: 20px; font-size: 11px; font-weight: 700;
  background: rgba(0,212,255,.1); border: 1px solid rgba(0,212,255,.2); color: var(--cyan);
  text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px;
}
.hero h1 {
  font-size: clamp(32px, 6vw, 52px); font-weight: 900; line-height: 1.1; margin-bottom: 12px;
  background: var(--gradient-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p { color: var(--text-muted); font-size: 17px; max-width: 600px; margin: 0 auto; }

/* SECTION */
.section { margin-bottom: 40px; }
.section-title {
  font-size: 22px; font-weight: 900; margin-bottom: 16px; display: flex; align-items: center; gap: 10px;
}
.section-title .icon { font-size: 26px; }

/* CARDS GRID */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px;
  padding: 24px; transition: var(--transition); position: relative; overflow: hidden;
  text-decoration: none; color: var(--text); display: block;
}
.card:hover { border-color: var(--cyan); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,212,255,.1); }
.card-icon { font-size: 36px; margin-bottom: 12px; }
.card h3 { font-size: 17px; font-weight: 800; margin-bottom: 6px; }
.card p { color: var(--text-muted); font-size: 13px; line-height: 1.5; }
.card-tag {
  display: inline-block; padding: 2px 8px; border-radius: 6px; font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.5px; margin-top: 10px;
}
.tag-code { background: rgba(0,212,255,.1); color: var(--cyan); }
.tag-elec { background: rgba(0,255,136,.1); color: var(--green); }
.tag-3d { background: rgba(168,85,247,.1); color: var(--purple); }
.tag-game { background: rgba(244,114,182,.1); color: var(--pink); }
.tag-new { background: rgba(245,158,11,.1); color: var(--orange); }

/* CODE BLOCKS */
.code-block {
  background: #0d0d20; border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; overflow-x: auto; margin: 16px 0;
  font-family: var(--mono); font-size: 13px; line-height: 1.7;
}
.code-block .kw { color: var(--purple); } /* keyword */
.code-block .fn { color: var(--cyan); }   /* function */
.code-block .st { color: var(--green); }  /* string */
.code-block .cm { color: var(--text-muted); font-style: italic; } /* comment */
.code-block .nb { color: var(--orange); } /* number */

/* PROGRESS */
.progress-bar { width: 100%; height: 6px; background: var(--bg-elevated); border-radius: 3px; overflow: hidden; margin-top: 8px; }
.progress-fill { height: 100%; background: var(--gradient-main); border-radius: 3px; transition: width 0.5s; }

/* BUTTONS */
.btn-cyber {
  display: inline-block; padding: 12px 28px; border-radius: 12px; border: 1px solid var(--cyan);
  background: rgba(0,212,255,.08); color: var(--cyan); font-family: var(--font);
  font-weight: 700; font-size: 14px; cursor: pointer; transition: var(--transition); text-decoration: none;
}
.btn-cyber:hover { background: rgba(0,212,255,.15); box-shadow: 0 0 20px rgba(0,212,255,.2); transform: scale(1.03); }
.btn-neon {
  display: inline-block; padding: 14px 32px; border-radius: 14px; border: none;
  background: var(--gradient-main); color: #fff; font-family: var(--font);
  font-weight: 800; font-size: 16px; cursor: pointer; transition: var(--transition); text-decoration: none;
}
.btn-neon:hover { transform: scale(1.05); box-shadow: 0 4px 25px rgba(0,212,255,.3); }

/* FOOTER */
.site-footer {
  text-align: center; padding: 20px; border-top: 1px solid var(--border);
  color: var(--text-muted); font-size: 13px;
}
.site-footer a { color: var(--cyan); text-decoration: none; }

/* TERMINAL EFFECT */
.terminal {
  background: #0a0a15; border: 1px solid var(--green); border-radius: 12px;
  padding: 20px; font-family: var(--mono); font-size: 13px; color: var(--green);
  position: relative;
}
.terminal::before {
  content: '● ● ●'; position: absolute; top: 8px; left: 12px; font-size: 8px;
  color: var(--text-muted); letter-spacing: 4px;
}
.terminal pre { margin-top: 12px; white-space: pre-wrap; }

/* TOOLTIP */
.tip {
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; margin: 16px 0; display: flex; gap: 12px; align-items: flex-start;
}
.tip-icon { font-size: 24px; flex-shrink: 0; }
.tip p { font-size: 14px; color: var(--text-muted); }
.tip strong { color: var(--text); }

/* RESPONSIVE */
@media (max-width: 640px) {
  .card-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
}

/* ANIMATIONS */
.fade-in { opacity: 0; transform: translateY(20px); animation: fadeUp 0.5s ease forwards; }
@keyframes fadeUp { to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
  .fade-in { animation: none; opacity: 1; transform: none; }
}