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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
    overflow-x: hidden;
    color: #fff;
    background: #0a0a0a;
}

.hero-background {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
            180deg,
            rgba(10, 10, 10, 0.4) 0%,
            rgba(10, 10, 10, 0.7) 100%
    );
    z-index: 1;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.hero-bg img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.overlay {
    position: absolute;
    bottom: 15%;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    text-align: center;
    z-index: 2;
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    gap: 20px;
}

.overlay h2 {
    font-size: 3.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 0 6px 30px rgba(0, 0, 0, 0.8);
    background: linear-gradient(135deg, #ffffff 0%, #b0c4de 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
    line-height: 1.3;
}

.subtitle {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 20px;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.donate-button {
    padding: 18px 50px;
    border: none;
    border-radius: 50px;
    background: linear-gradient(135deg, #0D85FD 0%, #0a6ed4 100%);
    color: #ffffff;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow:
            0 10px 40px rgba(13, 133, 253, 0.4),
            0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.donate-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s;
}

.donate-button:hover::before {
    left: 100%;
}

.donate-button:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow:
            0 15px 50px rgba(13, 133, 253, 0.6),
            0 0 0 1px rgba(255, 255, 255, 0.2) inset;
}

.donate-button:active {
    transform: translateY(-2px) scale(1.02);
}

.features {
    position: absolute;
    bottom: 5%;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 50px;
    z-index: 2;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.95rem;
    font-weight: 500;
}

.feature-icon {
    width: 6px;
    height: 6px;
    background: #0D85FD;
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(13, 133, 253, 0.8);
}

@media (max-width: 768px) {
    .overlay {
        bottom: 20%;
    }

    .overlay h2 {
        font-size: 2rem;
        padding: 0 20px;
    }

    .subtitle {
        font-size: 1rem;
        padding: 0 20px;
    }

    .donate-button {
        font-size: 1rem;
        padding: 14px 35px;
    }

    .features {
        flex-direction: column;
        gap: 15px;
        align-items: center;
    }

    .feature-item {
        font-size: 0.85rem;
    }
}

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

.overlay > * {
    animation: fadeInUp 0.8s ease-out backwards;
}

.overlay h2 {
    animation-delay: 0.2s;
}

.subtitle {
    animation-delay: 0.4s;
}

.donate-button {
    animation-delay: 0.6s;
}