body {
    margin: 0;
    background-color: #f5f5f5;
    color: #0f1a4a;
    font-family: Arial, sans-serif;
}

.navbar {
    background-color: #ffffff;
    padding-top: 20px;
    padding-bottom: 20px;
}

.navbar-brand {
    font-size: 20px;
    font-weight: 700;
    color: #0f1a4a;
}

.navbar-brand:hover {
    color: #0f1a4a;
}

.brand-icon {
    width: 36px;
    height: 36px;
    object-fit: contain;
    margin-right: 10px;
}

.nav-link {
    color: #0f1a4a;
    font-size: 18px;
    margin-left: 28px;
}

.nav-link:hover {
    color: #0f1a4a;
}

.welcome-section {
    padding-top: 80px;
    padding-bottom: 80px;
}

.content-wrap {
    max-width: 760px;
    margin: 0 auto;
}

.title {
    text-align: center;
    font-size: 48px;
    line-height: 1.1;
    font-weight: 700;
    color: #0f1a4a;
    margin-bottom: 48px;
}

.step-text {
    font-size: 26px;
    line-height: 1.5;
    color: #97a0b7;
    margin-bottom: 28px;
}

.step-image {
    width: 100%;
    display: block;
    border-radius: 18px;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.08);
    margin-bottom: 64px;
}

.party-icon {
    margin-right: 14px;
}

@media (max-width: 991.98px) {
    .title {
        font-size: 56px;
    }

    .step-text {
        font-size: 22px;
    }

    .nav-link {
        margin-left: 0;
    }
}

@media (max-width: 767.98px) {
    .welcome-section {
        padding-top: 48px;
        padding-bottom: 48px;
    }

    .title {
        font-size: 38px;
        margin-bottom: 32px;
    }

    .step-text {
        font-size: 18px;
        margin-bottom: 18px;
    }

    .step-image {
        margin-bottom: 40px;
        border-radius: 12px;
    }

    .navbar-brand {
        font-size: 18px;
    }

    .brand-icon {
        width: 30px;
        height: 30px;
    }
}

.image-fireworks {
    position: relative;
}

.fireworks-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.spark {
    position: absolute;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    opacity: 0;
    transform: translate(-50%, -50%);
    animation: spark 900ms ease-out forwards;
}

@keyframes spark {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.3);
    }
    10% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform:
                translate(
                        calc(-50% + var(--dx)),
                        calc(-50% + var(--dy))
                )
                scale(1.2);
    }
}