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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #0f172a;
    color: #e5e7eb;
    line-height: 1.6;
}

/* ---------- HEADER ---------- */

.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 50px;
    z-index: 1000;
}

.logo {
    font-size: 20px;
    font-weight: bold;
}

.header nav a {
    margin-left: 25px;
    text-decoration: none;
    color: #e5e7eb;
    transition: color 0.3s;
}

.header nav a:hover {
    color: #38bdf8;
}

.btn-nav {
    padding: 6px 14px;
    border: 1px solid #38bdf8;
    border-radius: 20px;
}

/* ---------- HERO ---------- */

.hero {
    height: 100vh;
    background: linear-gradient(135deg, #020617, #0f172a);
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
}

.hero-content {
    max-width: 700px;
    text-align: center;
    animation: fadeIn 1.2s ease;
}

.hero h1 {
    font-size: 42px;
    margin-bottom: 20px;
}

.hero p {
    color: #cbd5f5;
    margin-bottom: 30px;
}

/* ---------- BUTTONS ---------- */

.btn-main {
    display: inline-block;
    padding: 14px 32px;
    background: #38bdf8;
    color: #020617;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-main:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(56,189,248,0.4);
}

.big {
    font-size: 18px;
}

/* ---------- SECTIONS ---------- */

.section {
    padding: 100px 60px;
    text-align: center;
}

.section h2 {
    font-size: 32px;
    margin-bottom: 40px;
}

.section.dark {
    background: #020617;
}

/* ---------- CARDS ---------- */

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
}

.card {
    background: #020617;
    padding: 30px;
    border-radius: 20px;
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-8px);
}

.card h3 {
    margin-bottom: 15px;
}

/* ---------- VIDEO ---------- */

.video-card {
    max-width: 700px;
    margin: 0 auto;
}

.video-card iframe {
    width: 100%;
    height: 400px;
    border-radius: 20px;
    margin-bottom: 10px;
}

/* ---------- CTA ---------- */

.cta {
    background: linear-gradient(135deg, #38bdf8, #0ea5e9);
    color: #020617;
    padding: 100px 40px;
    text-align: center;
}

.cta p {
    margin: 20px 0 30px;
}

/* ---------- FOOTER ---------- */

.footer {
    background: #020617;
    padding: 20px;
    text-align: center;
    font-size: 14px;
    color: #94a3b8;
}

/* ---------- ANIMATIONS ---------- */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---------- RESPONSIVE ---------- */

@media (max-width: 768px) {
    .hero h1 {
        font-size: 32px;
    }
    .header {
        padding: 15px 25px;
    }
}

input {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border-radius: 8px;
    border: none;
    background: #0f172a;
    color: #e5e7eb;
}

#form-error {
    color: #f87171;
    margin-top: 10px;
}