/* Base styles */
:root {
    --color-bg: #f8f9fa;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-primary: #2563eb;
    --color-secondary: #6b7280;
    --space-4: 1rem;
    --space-8: 2rem;
    --radius-md: 0.5rem;
}

[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-text: #f1f5f9;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: system-ui, sans-serif; line-height: 1.6; color: var(--color-text); background: var(--color-bg); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-4); }

/* Header */
header { background: var(--color-surface); box-shadow: 0 2px 4px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }
.nav-container { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; padding: var(--space-4) var(--space-8); }
.logo { font-size: 1.5rem; font-weight: bold; text-decoration: none; color: var(--color-primary); }
.nav-menu { display: flex; list-style: none; gap: var(--space-4); }
.nav-menu a { text-decoration: none; color: var(--color-text); padding: 0.5rem 1rem; border-radius: var(--radius-md); transition: background 0.2s; }
.nav-menu a:hover, .nav-menu a:focus { background: var(--color-primary); color: white; }
.lang-btn { background: none; border: 1px solid var(--color-secondary); padding: 0.5rem 1rem; border-radius: var(--radius-md); cursor: pointer; font-weight: bold; }

/* Hero */
.hero { padding: var(--space-8) 0; text-align: center; background: linear-gradient(135deg, var(--color-primary), #3b82f6); color: white; }
.hero h1 { font-size: clamp(2rem, 5vw, 4rem); margin-bottom: var(--space-4); }
.hero ul { max-width: 600px; margin: 0 auto var(--space-4); list-style: none; }
.hero li { margin: var(--space-4) 0; font-size: 1.2rem; }

/* Product sections */
.product-section { padding: var(--space-8) 0; }
.product-section h2 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: var(--space-4); color: var(--color-primary); }
.features-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8); margin: var(--space-8) 0; }
.feature-card { background: var(--color-surface); padding: var(--space-8); border-radius: var(--radius-md); box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.pricing-table { width: 100%; margin: var(--space-8) 0; border-collapse: collapse; background: var(--color-surface); border-radius: var(--radius-md); overflow: hidden; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.pricing-table th, .pricing-table td { padding: var(--space-4); text-align: left; border-bottom: 1px solid #e5e7eb; }
.pricing-table th { background: var(--color-primary); color: white; }
.cta-button { display: inline-block; background: var(--color-primary); color: white; padding: 1rem 2rem; text-decoration: none; border-radius: var(--radius-md); font-weight: bold; margin-top: var(--space-4); transition: transform 0.2s; }
.cta-button:hover, .cta-button:focus { transform: translateY(-2px); box-shadow: 0 8px 16px rgba(37,99,235,0.3); }

/* Contact */
.contact-section { background: var(--color-surface); padding: var(--space-8) 0; }
.form-group { margin-bottom: var(--space-8); }
.form-group label { display: block; margin-bottom: var(--space-4); font-weight: bold; }
.form-group input, .form-group textarea { width: 100%; padding: var(--space-4); border: 1px solid #d1d5db; border-radius: var(--radius-md); font-size: 1rem; }
button[type="submit"] { background: var(--color-primary); color: white; padding: 1rem 2rem; border: none; border-radius: var(--radius-md); cursor: pointer; font-weight: bold; margin-right: var(--space-4); }

/* Footer */
footer { background: #1f2937; color: white; padding: var(--space-4); text-align: center; }
footer a { color: #60a5fa; text-decoration: none; }

/* Responsive */
@media (max-width: 768px) {
    .nav-menu { flex-direction: column; gap: var(--space-4); }
    .features-grid { grid-template-columns: 1fr; }
    .hero { padding: var(--space-4) 0; }
}

/* Accessibility */
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } }