* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background-color: #f7f9fc;
    color: #2d3748;
}

/* ── NAVBAR ── */
nav {
    background: #1a202c;
    padding: 16px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

nav .logo {
    color: #63b3ed;
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 24px;
}

nav ul li a {
    color: #cbd5e0;
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

nav ul li a:hover {
    color: #63b3ed;
}

/* ── HAMBURGER ── */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background: #cbd5e0;
    border-radius: 3px;
    transition: all 0.3s;
}

/* ── HERO ── */
.hero {
    background: linear-gradient(135deg, #1a202c, #2b6cb0);
    color: white;
    text-align: center;
    padding: 100px 20px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    color: #bee3f8;
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero button {
    background: #63b3ed;
    color: #1a202c;
    border: none;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.2s;
}

.hero button:hover {
    background: #90cdf4;
}

/* ── CLASSES SECTION ── */
.section {
    padding: 60px 40px;
    text-align: center;
}

.section h2 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: #2d3748;
}

.section p.subtitle {
    color: #718096;
    margin-bottom: 40px;
    font-size: 1rem;
}

/* ── CARDS ── */
.cards {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.card {
    background: white;
    border-radius: 12px;
    padding: 30px 24px;
    width: 260px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    transition: transform 0.2s;
    text-decoration: none;
    color: #2d3748;
    display: block;
}

.card:hover {
    transform: translateY(-6px);
}

.card .icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #2d3748;
}

.card p {
    font-size: 0.9rem;
    color: #718096;
    line-height: 1.6;
}

/* ── RESOURCE LINKS ── */
.resource-links {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.resource-links a {
    background: #ebf8ff;
    color: #2b6cb0;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    text-decoration: none;
    transition: background 0.2s;
}

.resource-links a:hover {
    background: #bee3f8;
}

/* ── FOOTER ── */
footer {
    background: #1a202c;
    color: #718096;
    text-align: center;
    padding: 24px;
    font-size: 0.85rem;
}

footer span {
    color: #63b3ed;
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {

    nav {
        padding: 16px 24px;
    }

    .hamburger {
        display: flex;
    }

    nav ul {
        display: none;
        flex-direction: column;
        gap: 0;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: #1a202c;
        padding: 10px 0;
        border-top: 1px solid #2d3748;
    }

    nav ul.open {
        display: flex;
    }

    nav ul li a {
        display: block;
        padding: 12px 24px;
        font-size: 1rem;
    }

    nav ul li a:hover {
        background: #2d3748;
    }

    .hero {
        padding: 70px 20px;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .section {
        padding: 50px 24px;
    }

    .cards {
        gap: 16px;
    }

    .card {
        width: 100%;
        max-width: 340px;
    }
}

@media (max-width: 480px) {

    nav .logo {
        font-size: 1.2rem;
    }

    .hero {
        padding: 60px 16px;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero p {
        font-size: 0.95rem;
    }

    .hero button {
        width: 100%;
        max-width: 280px;
    }

    .section {
        padding: 40px 16px;
    }

    .cards {
        flex-direction: column;
        align-items: center;
    }

    .card {
        width: 100%;
        max-width: 100%;
    }
}