:root {
    --primary: #2563eb;
    --dark: #0f172a;
    --gray: #64748b;
    --light: #f1f5f9;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, sans-serif;
    color: var(--dark);
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: auto;
}

.section {
    padding: 60px 0;
}

.section.alt {
    background: var(--light);
}

h1, h2, h3 {
    margin-top: 0;
}

h2 {
    margin-bottom: 20px;
}

/* HERO */
.hero {
    background: linear-gradient(135deg, #1e3a8a, #2563eb);
    color: white;
    text-align: center;
    padding: 100px 20px;
}

.subtitle {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

/* NAV */
.nav {
    background: white;
    border-bottom: 1px solid #eee;
    position: sticky;
    top: 0;
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.nav a {
    margin-left: 20px;
    text-decoration: none;
    color: var(--dark);
}

.logo {
    font-weight: bold;
}

/* GRID */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

/* CARD */
.card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-5px);
}

/* BUTTON */
.btn {
    display: inline-block;
    background: white;
    color: var(--primary);
    padding: 12px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
}

.btn:hover {
    opacity: 0.9;
}

/* CONTACT */
.contact {
    text-align: center;
}

/* FOOTER */
footer {
    text-align: center;
    padding: 20px;
    background: var(--dark);
    color: white;
}