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

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #0F172A;
  --primary-fg: #F8FAFC;
  --accent: #3B82F6;
  --accent-fg: #FFFFFF;
  --bg: #F8FAFC;
  --fg: #1E293B;
  --muted: #64748B;
  --border: #E2E8F0;
  --card: #FFFFFF;
  --muted-bg: #F1F5F9;
  --radius: 0.5rem;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 { font-family: 'Montserrat', sans-serif; }

a { color: inherit; text-decoration: none; transition: 0.2s; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }

.header {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo { 
  font-family: 'Montserrat', sans-serif; 
  font-weight: 700; 
  font-size: 1.25rem; 
  color: var(--primary); 
  display: flex; 
  align-items: center; 
  gap: 0.5rem; 
  text-transform: lowercase;
}
.logo span { color: var(--accent); }
.logo svg { color: var(--accent); }

.nav { display: flex; gap: 1.5rem; }
.nav a { font-size: 0.875rem; font-weight: 500; }
.nav a:hover, .nav a.active { color: var(--accent); }

.mobile-toggle { display: none; background: none; border: none; cursor: pointer; }

@media (max-width: 768px) {
  .nav { display: none; }
  .mobile-toggle { display: block; }
  .nav.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--card); border-bottom: 1px solid var(--border); padding: 1rem 2rem; }
}

.hero { background: var(--primary); color: var(--primary-fg); padding: 4rem 0; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; align-items: center; }
.hero-badge { display: inline-block; background: rgba(59,130,246,0.2); color: var(--accent); font-size: 0.75rem; font-weight: 600; padding: 0.25rem 0.75rem; border-radius: 9999px; margin-bottom: 1rem; }
.hero h1 { font-size: 2.5rem; font-weight: 800; line-height: 1.2; }
.hero p { margin-top: 1rem; color: rgba(248,250,252,0.8); font-size: 1.125rem; }
.hero-buttons { margin-top: 1.5rem; display: flex; gap: 0.75rem; }
.hero-img { width: 100%; height: 320px; object-fit: cover; border-radius: var(--radius); box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); }

@media (max-width: 768px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-img { display: none; }
  .hero h1 { font-size: 1.75rem; }
}

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.625rem 1.5rem; border-radius: var(--radius);
  font-size: 0.875rem; font-weight: 600; border: none; cursor: pointer;
  text-decoration: none;
}
.btn-quest { background: var(--accent); color: var(--accent-fg); }
.btn-quest:hover { background: #2563EB; }
.btn-outline { background: transparent; color: var(--primary-fg); border: 1px solid rgba(248,250,252,0.3); }
.btn-outline:hover { background: rgba(248,250,252,0.1); }

.footer { background: var(--primary); color: var(--primary-fg); border-top: 1px solid var(--border); }
.footer-inner { padding: 3.5rem 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 2.5rem; }

@media (max-width: 768px) { .footer-inner { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-inner { grid-template-columns: 1fr; } }

.footer h4 { 
  font-family: 'Montserrat', sans-serif; 
  font-weight: 700; 
  margin-bottom: 1.25rem; 
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}
.footer p, .footer li { font-size: 0.85rem; color: rgba(248,250,252,0.6); line-height: 1.5; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 0.625rem; }
.footer a:hover { color: var(--accent); }

.footer-contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.footer-contact-info strong {
  color: var(--primary-fg);
  font-size: 0.875rem;
  display: block;
  margin-bottom: 0.2rem;
}

.footer-bottom { 
  padding: 1.5rem 0; 
  border-top: 1px solid rgba(248,250,252,0.1); 
  text-align: center; 
  font-size: 0.75rem; 
  color: rgba(248,250,252,0.4); 
}

.features { padding: 4rem 0; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; text-align: center; }
.feature-card { padding: 1.5rem; border-radius: var(--radius); background: var(--card); border: 1px solid var(--border); }
.feature-card svg { width: 40px; height: 40px; color: var(--accent); margin: 0 auto 1rem; }
.feature-card h3 { font-weight: 700; font-size: 1.125rem; }
.feature-card p { margin-top: 0.5rem; font-size: 0.875rem; color: var(--muted); }

.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; padding-bottom: 4rem; }
.card { display: block; border-radius: var(--radius); overflow: hidden; background: var(--card); border: 1px solid var(--border); transition: 0.2s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.card-img { width: 100%; height: 192px; object-fit: cover; }
.card-body { padding: 1.25rem; }

.badge-easy { background: #DCFCE7; color: #166534; }
.badge-medium { background: #FEF9C3; color: #854D0E; }
.badge-hard { background: #FFEDD5; color: #9A3412; }
.badge-expert { background: #FEE2E2; color: #991B1B; }