body {
    background: #ffffff;
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    font-size: 16px;
    line-height: 1.6;
    color: #1e293b;
}

/* Topbar */
.topbar {
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1020;
    border-bottom: 1px solid #e2e8f0;
}
.brand-logo {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 12px;
}
.brand-title {
    font-family: 'Inter', sans-serif;
    font-weight: 800;
    color: #0f172a;
    letter-spacing: 0.5px;
}
.topnav .nav-link {
    color: #475569;
    margin: 0 12px;
    padding: 8px 16px;
    border-radius: 20px;
    transition: background 0.2s ease, color 0.2s ease;
    text-decoration: none;
}
.topnav .nav-link:hover {
    background: #f1f5f9;
    color: #0f172a;
}
.topnav .nav-link.active {
    background: #1e40af;
    color: #ffffff;
}

/* Hero */
.hero {
    min-height: 80vh;
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(255,255,255,0.05) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.hero-inner {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 40px;
}

.hero-title {
    font-size: 72px;
    font-weight: 800;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Features */
.features {
    padding: 100px 20px;
    background: #ffffff;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 50px;
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background: #ffffff;
    padding: 40px;
    border-radius: 24px;
    border: 1px solid #e2e8f0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(30,64,175,0.05) 0%, rgba(59,130,246,0.05) 100%);
    border-radius: 24px;
    z-index: -1;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.card h3 {
    font-size: 32px;
    color: #0f172a;
    margin-bottom: 20px;
    font-weight: 700;
}

.card p {
    color: #64748b;
    margin-bottom: 30px;
    font-size: 18px;
    line-height: 1.7;
}

.btn-custom {
    background: #1e40af;
    color: white;
    padding: 16px 32px;
    border-radius: 50px;
    text-decoration: none;
    display: inline-block;
    font-weight: 600;
    font-size: 16px;
    transition: background 0.3s ease, transform 0.2s ease;
}

.btn-custom:hover {
    background: #1d4ed8;
    transform: scale(1.05);
}

/* Countdown */
.countdown {
    padding: 80px 20px;
    background: #f8fafc;
    color: #0f172a;
    text-align: center;
}

.countdown h2 {
    font-size: 48px;
    margin-bottom: 30px;
    font-weight: 700;
}

#timer {
    font-size: 64px;
    font-weight: 800;
    color: #1e40af;
}

/* CTA */
.cta {
    padding: 80px 20px;
    background: #1e40af;
    color: white;
    text-align: center;
}

.cta .btn {
    background: #ffffff;
    color: #1e40af;
    border: none;
    padding: 20px 40px;
    font-size: 20px;
    border-radius: 50px;
    font-weight: 600;
}

.cta .btn:hover {
    background: #f1f5f9;
}

/* Footer */
.footer {
    padding: 60px 20px;
    background: #0f172a;
    color: #94a3b8;
    text-align: center;
}

/* Reveal animations */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 48px;
    }
    .hero-subtitle {
        font-size: 20px;
    }
    .features {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .countdown h2 {
        font-size: 36px;
    }
    #timer {
        font-size: 48px;
    }
}
/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 48px;
    }
    .hero-subtitle {
        font-size: 20px;
    }
    .features {
        grid-template-columns: 1fr;
    }
}