/* MashnLearn — AI Content Generator */
:root {
  --bg: #0a0e1a;
  --surface: #111827;
  --border: #1e2d45;
  --blue: #2563eb;
  --blue-light: #3b82f6;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --green: #10b981;
  --font: system-ui, -apple-system, 'Segoe UI', sans-serif;
  --max: 1060px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; }

h1 { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 800; line-height: 1.1; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.3rem, 2.5vw, 1.75rem); font-weight: 700; letter-spacing: -0.02em; }
h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
p { color: var(--muted); margin-bottom: 1rem; }
a { color: var(--blue-light); }

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* NAV */
nav { padding: 20px 0; border-bottom: 1px solid var(--border); }
.nav-inner { max-width: var(--max); margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-weight: 800; font-size: 1.1rem; color: var(--text); text-decoration: none; letter-spacing: -0.02em; }
.nav-logo span { color: var(--blue-light); }
.nav-badge { font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 2px; background: var(--surface); border: 1px solid var(--border); color: var(--muted); padding: 4px 10px; border-radius: 20px; }

/* HERO */
.hero { padding: 96px 0 80px; text-align: center; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -200px; left: 50%; transform: translateX(-50%); width: 600px; height: 600px; background: radial-gradient(circle, rgba(37,99,235,0.12) 0%, transparent 70%); pointer-events: none; }
.hero-badge { display: inline-block; background: rgba(37,99,235,0.1); border: 1px solid rgba(59,130,246,0.3); color: var(--blue-light); font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 2px; padding: 6px 16px; border-radius: 20px; margin-bottom: 24px; }
.hero h1 { max-width: 780px; margin: 0 auto 20px; }
.hero h1 em { font-style: normal; color: var(--blue-light); }
.hero-lead { font-size: 1.15rem; max-width: 580px; margin: 0 auto 40px; color: var(--muted); }
.btn-group { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-block; padding: 13px 28px; border-radius: 6px; font-weight: 700; font-size: 0.9rem; text-decoration: none; transition: all 0.15s; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-light); color: #fff; }
.btn-ghost { border: 1px solid var(--border); color: var(--muted); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue-light); }

/* STATS */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: 10px; margin: 64px 0; overflow: hidden; }
.stat-item { background: var(--surface); padding: 32px 24px; text-align: center; }
.stat-number { font-size: 2.2rem; font-weight: 800; color: var(--text); letter-spacing: -0.03em; }
.stat-number span { color: var(--blue-light); }
.stat-label { font-size: 0.82rem; color: var(--muted); margin: 0; }

/* FEATURES */
.features { padding: 80px 0; }
.section-label { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 3px; color: var(--blue-light); margin-bottom: 10px; }
.section-title { margin-bottom: 12px; }
.section-lead { max-width: 560px; margin-bottom: 48px; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.feature-card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 28px; transition: border-color 0.15s; }
.feature-card:hover { border-color: var(--blue); }
.feature-icon { font-size: 1.5rem; margin-bottom: 14px; }
.feature-card p { font-size: 0.9rem; margin: 0; }

/* HOW IT WORKS */
.how { padding: 80px 0; background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 32px; margin-top: 40px; }
.step { position: relative; }
.step-num { font-size: 2.5rem; font-weight: 800; color: var(--border); line-height: 1; margin-bottom: 12px; }
.step h3 { color: var(--text); }
.step p { font-size: 0.875rem; }

/* USE CASES */
.use-cases { padding: 80px 0; }
.use-case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-top: 40px; }
.use-case { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 20px; }
.use-case .tag { display: inline-block; font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; background: rgba(16,185,129,0.1); color: var(--green); border: 1px solid rgba(16,185,129,0.2); padding: 3px 8px; border-radius: 4px; margin-bottom: 8px; }
.use-case h3 { font-size: 0.95rem; color: var(--text); margin-bottom: 6px; }
.use-case p { font-size: 0.82rem; margin: 0; }

/* CTA */
.cta-section { padding: 96px 0; text-align: center; }
.cta-box { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 56px 40px; max-width: 640px; margin: 0 auto; position: relative; overflow: hidden; }
.cta-box::before { content: ''; position: absolute; top: -100px; left: 50%; transform: translateX(-50%); width: 400px; height: 400px; background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%); pointer-events: none; }
.cta-box h2 { margin-bottom: 12px; }
.cta-box p { margin-bottom: 28px; }

/* FOOTER */
footer { border-top: 1px solid var(--border); padding: 32px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; font-size: 0.8rem; color: var(--muted); }
.footer-logo { font-weight: 800; color: var(--text); font-size: 0.9rem; }
.footer-logo span { color: var(--blue-light); }

@media (max-width: 640px) {
  .stats { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
  .hero { padding: 64px 0 56px; }
}