:root {
  --primary: #00ffff;
  --primary-dark: #00ebeb;
  --primary-light: #f2ffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e2e8f0;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif; color: var(--text); background: var(--bg); line-height: 1.6; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }

/* Navbar */
.navbar {
  position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,0.85); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; padding: 1rem 2rem; }
.logo { font-weight: 800; font-size: 1.125rem; color: var(--text); text-decoration: none; }
.navbar nav { display: flex; align-items: center; gap: 1.5rem; }
.navbar nav a { color: var(--text-muted); text-decoration: none; font-size: 0.9rem; transition: color 0.2s; }
.navbar nav a:hover { color: var(--text); }
.btn-cta { background: var(--primary); color: white !important; padding: 0.5rem 1.25rem; border-radius: 8px; font-weight: 500; }
.btn-cta:hover { background: var(--primary-dark); color: white !important; }

/* Buttons */
.btn-primary, .btn-secondary { display: inline-block; padding: 0.875rem 1.75rem; border-radius: 10px; text-decoration: none; font-weight: 600; transition: all 0.2s; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 10px 25px -5px rgba(0,0,0,0.15); }
.btn-secondary { background: white; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg-alt); }
.btn-lg { padding: 1.1rem 2.5rem; font-size: 1.05rem; }

/* Hero */
.hero { padding: 6rem 0 8rem; text-align: center; background: linear-gradient(180deg, var(--primary-light), var(--bg)); }
.hero h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 800; letter-spacing: -0.03em; margin-bottom: 1rem; color: var(--text); }
.hero .tagline { font-size: 1.4rem; color: var(--text-muted); margin-bottom: 2.5rem; max-width: 700px; margin-left: auto; margin-right: auto; }
.hero-cta { display: flex; gap: 1rem; justify-content: center; margin-bottom: 2rem; flex-wrap: wrap; }
.hero-note { color: var(--text-muted); max-width: 600px; margin: 1rem auto 0; font-size: 0.95rem; }

/* Sections */
.section { padding: 6rem 0; }
.section-alt { background: var(--bg-alt); }
.section h2 { font-size: 2.5rem; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 3rem; text-align: center; }

/* Features */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }
.feature { background: var(--bg-alt); padding: 2rem; border-radius: 16px; border: 1px solid var(--border); transition: all 0.2s; }
.feature:hover { transform: translateY(-4px); box-shadow: 0 20px 40px -10px rgba(0,0,0,0.1); }
.section-alt .feature { background: white; }
.feature-icon { font-size: 2.5rem; margin-bottom: 1rem; }
.feature h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
.feature p { color: var(--text-muted); }

/* Pricing */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; align-items: stretch; }
.plan { background: white; padding: 2.5rem 2rem; border-radius: 16px; border: 1px solid var(--border); display: flex; flex-direction: column; position: relative; }
.plan-highlighted { border: 2px solid var(--primary); transform: scale(1.03); box-shadow: 0 20px 50px -10px rgba(0,0,0,0.1); }
.plan-badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--primary); color: white; padding: 0.25rem 0.75rem; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.plan h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
.plan .price { font-size: 2.5rem; font-weight: 800; margin-bottom: 1.5rem; }
.plan .price span { font-size: 0.95rem; font-weight: 500; color: var(--text-muted); }
.plan ul { list-style: none; padding: 0; margin-bottom: 2rem; flex: 1; }
.plan li { padding: 0.5rem 0; color: var(--text-muted); border-bottom: 1px solid var(--border); }
.plan li::before { content: "✓ "; color: var(--primary); font-weight: bold; }

/* FAQ */
.faq { max-width: 700px; margin: 0 auto; }
.faq details { background: white; border: 1px solid var(--border); border-radius: 12px; padding: 1.25rem 1.5rem; margin-bottom: 0.75rem; }
.faq summary { font-weight: 600; cursor: pointer; outline: none; }
.faq details[open] summary { color: var(--primary); margin-bottom: 0.5rem; }
.faq p { color: var(--text-muted); }
.faq a { color: var(--primary); }

/* CTA banner */
.cta-banner { padding: 5rem 0; background: var(--primary); color: white; text-align: center; }
.cta-banner h2 { font-size: 2.25rem; margin-bottom: 1rem; }
.cta-banner p { font-size: 1.15rem; opacity: 0.95; margin-bottom: 2rem; }
.cta-banner .btn-primary { background: white; color: var(--primary); }
.cta-banner .btn-primary:hover { background: rgba(255,255,255,0.9); }

/* Footer */
footer { padding: 3rem 0; text-align: center; border-top: 1px solid var(--border); color: var(--text-muted); font-size: 0.875rem; }
footer a { color: var(--primary); text-decoration: none; }
footer a:hover { text-decoration: underline; }

@media (max-width: 640px) {
  .navbar nav a:not(.btn-cta) { display: none; }
  .plan-highlighted { transform: none; }
}