@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-tertiary: #1e293b;
  --bg-card: rgba(17, 24, 39, 0.6);
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --accent-primary: #8b5cf6;
  --accent-primary-light: #a78bfa;
  --accent-secondary: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;
  --accent-pink: #ec4899;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --text-dim: #475569;
  --border-subtle: rgba(148, 163, 184, 0.1);
  --border-medium: rgba(148, 163, 184, 0.2);
  --gradient-primary: linear-gradient(135deg, #8b5cf6, #3b82f6);
  --gradient-hero: linear-gradient(135deg, #0a0e1a 0%, #1a1040 25%, #0f172a 50%, #0a2540 75%, #0a0e1a 100%);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.5);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 40px rgba(139,92,246,0.15);
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --transition-fast: 150ms cubic-bezier(0.4,0,0.2,1);
  --transition-base: 250ms cubic-bezier(0.4,0,0.2,1);
  --transition-slow: 400ms cubic-bezier(0.4,0,0.2,1);
  --max-width: 1400px;
  --header-height: 72px;
  --sidebar-width: 380px;
}

/* ========= LIGHT THEME ========= */
[data-theme="light"] {
  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e8ecf4;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-card-hover: rgba(241, 245, 249, 0.9);
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --border-subtle: rgba(15, 23, 42, 0.06);
  --border-medium: rgba(15, 23, 42, 0.12);
  --gradient-hero: linear-gradient(135deg, #f0f4ff 0%, #e8ecff 25%, #f5f3ff 50%, #ecf4ff 75%, #f0f4ff 100%);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.1);
  --shadow-glow: 0 0 40px rgba(139,92,246,0.08);
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; -webkit-font-smoothing:antialiased; }
body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.3s ease;
}
::-webkit-scrollbar { width:8px; height:8px; }
::-webkit-scrollbar-track { background:var(--bg-primary); }
::-webkit-scrollbar-thumb { background:var(--bg-tertiary); border-radius:var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background:var(--text-dim); }
::selection { background:rgba(139,92,246,0.3); color:var(--text-primary); }
a { color:inherit; text-decoration:none; }
img { max-width:100%; display:block; }
button { font-family:inherit; cursor:pointer; border:none; outline:none; background:none; color:inherit; }
input, select, textarea { font-family:inherit; color:inherit; border:none; outline:none; background:none; }
ul, ol { list-style:none; }

/* NAVBAR — see css/navbar.css */

/* BUTTONS */
.btn {
  display:inline-flex; align-items:center; gap:0.5rem;
  padding:10px 24px; border-radius:var(--radius-md);
  font-size:0.95rem; font-weight:600;
  transition:all var(--transition-base); cursor:pointer; white-space:nowrap;
}
.btn-primary { background:var(--gradient-primary); color:white; box-shadow:0 4px 15px rgba(139,92,246,0.3); }
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 6px 25px rgba(139,92,246,0.4); }
.btn-secondary { background:var(--bg-tertiary); color:var(--text-primary); border:1px solid var(--border-medium); }
.btn-secondary:hover { background:var(--bg-card-hover); border-color:var(--accent-primary); }
.btn-ghost { color:var(--text-secondary); padding:8px 16px; }
.btn-ghost:hover { color:var(--text-primary); background:rgba(255,255,255,0.05); }

/* BADGES */
.badge {
  display:inline-flex; align-items:center; padding:4px 12px;
  border-radius:var(--radius-full); font-size:0.75rem;
  font-weight:600; text-transform:uppercase; letter-spacing:0.5px;
}
.badge-beginner { background:rgba(16,185,129,0.15); color:var(--accent-green); border:1px solid rgba(16,185,129,0.25); }
.badge-intermediate { background:rgba(245,158,11,0.15); color:var(--accent-amber); border:1px solid rgba(245,158,11,0.25); }
.badge-advanced { background:rgba(239,68,68,0.15); color:var(--accent-red); border:1px solid rgba(239,68,68,0.25); }

/* CONTAINER */
.container { max-width:var(--max-width); margin:0 auto; padding:0 2rem; }

/* FOOTER */
.footer { background:var(--bg-secondary); border-top:1px solid var(--border-subtle); padding:3rem 0 1.5rem; margin-top:4rem; }
.footer-inner {
  max-width:var(--max-width); margin:0 auto; padding:0 2rem;
  display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:2rem;
}
.footer-brand p { color:var(--text-muted); font-size:0.9rem; margin-top:1rem; max-width:300px; line-height:1.7; }
.footer-heading { font-size:0.85rem; font-weight:700; text-transform:uppercase; letter-spacing:1px; color:var(--text-secondary); margin-bottom:1rem; }
.footer-links { display:flex; flex-direction:column; gap:0.5rem; }
.footer-links a { color:var(--text-muted); font-size:0.9rem; transition:color var(--transition-fast); }
.footer-links a:hover { color:var(--accent-primary-light); }
.footer-bottom {
  max-width:var(--max-width); margin:2rem auto 0; padding:1rem 2rem 0;
  border-top:1px solid var(--border-subtle);
  display:flex; justify-content:space-between; align-items:center;
  color:var(--text-dim); font-size:0.85rem;
}
.social-links { display:flex; gap:1rem; }
.social-link {
  width:36px; height:36px; border-radius:var(--radius-full);
  background:var(--bg-tertiary); display:flex; align-items:center; justify-content:center;
  transition:all var(--transition-base); color:var(--text-muted);
}
.social-link:hover { background:var(--accent-primary); color:white; transform:translateY(-2px); }

/* ANIMATIONS */
@keyframes fadeIn { from{opacity:0} to{opacity:1} }
@keyframes fadeInUp { from{opacity:0;transform:translateY(30px)} to{opacity:1;transform:translateY(0)} }
@keyframes slideInRight { from{opacity:0;transform:translateX(30px)} to{opacity:1;transform:translateX(0)} }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.5} }
@keyframes shimmer { 0%{background-position:-200% center} 100%{background-position:200% center} }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-10px)} }
@keyframes gradientShift { 0%{background-position:0% 50%} 50%{background-position:100% 50%} 100%{background-position:0% 50%} }
.animate-fade-in { animation:fadeIn 0.6s ease forwards; }
.animate-fade-in-up { animation:fadeInUp 0.6s ease forwards; }
.animate-slide-in { animation:slideInRight 0.6s ease forwards; }

/* RESPONSIVE */
@media (max-width: 1024px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 768px) {
  .container { padding: 0 1rem; }
  .footer { padding: 2.5rem 0 1rem; margin-top: 3rem; }
  .footer-inner { grid-template-columns: 1fr; gap: 1.5rem; padding: 0 1.5rem; }
  .footer-brand p { max-width: 100%; }
  .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; padding: 1rem 1.5rem 0; }
  .social-links { justify-content: center; }
  .btn { padding: 10px 20px; font-size: 0.9rem; }
}
@media (max-width: 480px) {
  .container { padding: 0 0.75rem; }
  .footer-inner { padding: 0 1rem; }
}