:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #0ea5e9;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border: #e2e8f0;
    --radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }
body { background-color: var(--bg-white); color: var(--text-dark); line-height: 1.6; scroll-behavior: smooth; }
a { text-decoration: none; color: inherit; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Buttons */
.btn { padding: 14px 28px; border-radius: 8px; font-weight: 600; display: inline-flex; align-items: center; gap: 8px; cursor: pointer; transition: 0.3s; border: 2px solid transparent;}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2); }
.btn-secondary { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-secondary:hover { background: var(--primary); color: #fff; }

/* Demo Topbar */
.demo-topbar { background-color: #0f172a; color: #fff; padding: 12px 24px; display: flex; justify-content: space-between; align-items: center; font-size: 0.9rem; }
.demo-topbar a { color: #38bdf8; display: flex; align-items: center; gap: 6px; font-weight: 600; }
.demo-topbar a:hover { color: #fff; }

/* Header */
.header { padding: 20px 0; border-bottom: 1px solid var(--border); background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 100; }
.header-content { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 1.5rem; font-weight: 800; color: var(--primary); letter-spacing: -0.5px; }
.logo i { font-size: 2rem; color: var(--secondary); }
.nav { display: flex; gap: 32px; }
.nav a { font-weight: 500; color: var(--text-dark); transition: 0.2s; }
.nav a:hover { color: var(--primary); }

/* Hero Section */
.hero { padding: 80px 0 100px; background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%); }
.hero-content { display: flex; align-items: center; gap: 60px; }
.hero-text { flex: 1; }
.badge { display: inline-block; background: rgba(37, 99, 235, 0.1); color: var(--primary); padding: 6px 16px; border-radius: 20px; font-size: 0.85rem; font-weight: 700; margin-bottom: 24px; text-transform: uppercase; letter-spacing: 1px; }
.hero-text h1 { font-size: 3.5rem; line-height: 1.1; margin-bottom: 24px; color: var(--text-dark); font-weight: 800; letter-spacing: -1px; }
.highlight { color: var(--primary); }
.hero-text p { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 40px; max-width: 500px; }
.hero-buttons { display: flex; gap: 16px; margin-bottom: 48px; }
.hero-stats { display: flex; gap: 40px; }
.stat { display: flex; flex-direction: column; }
.stat .number { font-size: 2rem; font-weight: 800; color: var(--primary); line-height: 1; margin-bottom: 4px; }
.stat span:last-child { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.5px; }
.hero-image { flex: 1; display: flex; justify-content: center; }
.image-placeholder { width: 100%; aspect-ratio: 1; background: #cbd5e1; border-radius: 24px; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #64748b; border: 2px dashed #94a3b8; }

/* Specialties */
.specialties { padding: 100px 0; background: var(--bg-white); }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header h2 { font-size: 2.8rem; margin-bottom: 16px; color: var(--text-dark); font-weight: 800; letter-spacing: -1px; }
.section-header p { color: var(--text-muted); font-size: 1.1rem; }
.grid-specialties { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card { padding: 40px 32px; background: var(--bg-light); border-radius: var(--radius); border: 1px solid var(--border); transition: 0.3s; }
.card:hover { transform: translateY(-8px); box-shadow: 0 20px 40px rgba(0,0,0,0.05); border-color: var(--secondary); background: var(--bg-white); }
.card-icon { width: 64px; height: 64px; background: rgba(14, 165, 233, 0.1); color: var(--secondary); border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 2rem; margin-bottom: 24px; transition: 0.3s; }
.card:hover .card-icon { background: var(--secondary); color: #fff; transform: scale(1.1); box-shadow: 0 10px 20px rgba(14, 165, 233, 0.2); }
.card h3 { font-size: 1.2rem; margin-bottom: 12px; color: var(--text-dark); }
.card p { color: var(--text-muted); font-size: 0.95rem; }

/* Footer */
.footer { background: #0f172a; color: #f8fafc; padding: 80px 0 40px; }
.footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 64px; }
.footer-col h4 { font-size: 1.2rem; margin-bottom: 24px; color: #fff; }
.footer-col p { color: #94a3b8; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; font-size: 0.95rem; }
.footer-col i { color: var(--secondary); font-size: 1.2rem; }
.footer .logo { color: #fff; margin-bottom: 16px; }
.footer .logo i { color: var(--secondary); }

@media (max-width: 1024px) {
    .grid-specialties { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
    .hero-content { flex-direction: column; text-align: center; }
    .hero-text p { margin: 0 auto 40px; }
    .hero-buttons { justify-content: center; }
    .hero-stats { justify-content: center; }
    .footer-content { grid-template-columns: 1fr; gap: 40px; }
    .nav { display: none; }
}

@media (max-width: 500px) {
    .grid-specialties { grid-template-columns: 1fr; }
    .hero-text h1 { font-size: 2.5rem; }
    .hero-buttons { flex-direction: column; }
    .hero-stats { flex-direction: column; gap: 20px; align-items: center; }
}