/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    width: 100%;
    height: 100vh;
    height: 100dvh; /* dynamic viewport height for mobile browsers */
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #0b0c10;
}

/* Background Wrapper */
.bg-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('background.jpg') no-repeat center center;
    background-size: cover;
    z-index: 1;
    transition: transform 0.8s ease;
}

/* Dark elegant gradient overlay for readability and contrast */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(11, 12, 16, 0.75) 0%,
        rgba(11, 12, 16, 0.45) 50%,
        rgba(11, 12, 16, 0.85) 100%
    );
    z-index: 2;
}

/* Main Container */
.container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 3;
    padding: 20px;
    text-align: center;
}

/* Logo Styling */
.logo-container {
    max-width: 320px;
    width: 80%;
    margin-bottom: 50px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.logo-container img {
    width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.3));
}

/* WhatsApp Button */
.whatsapp-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
    color: #ffffff;
    text-decoration: none;
    padding: 16px 36px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    box-shadow: 0 10px 25px rgba(37, 211, 102, 0.35);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) 0.3s forwards, pulseGlow 3s infinite ease-in-out;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.whatsapp-btn svg {
    width: 26px;
    height: 26px;
    fill: currentColor;
    transition: transform 0.3s ease;
}

/* Hover / Active Effects */
.whatsapp-btn:hover {
    transform: translateY(-4px) scale(1.03);
    box-shadow: 0 15px 30px rgba(37, 211, 102, 0.5);
    background: linear-gradient(135deg, #2ae872 0%, #14a393 100%);
}

.whatsapp-btn:hover svg {
    transform: rotate(10deg) scale(1.1);
}

.whatsapp-btn:active {
    transform: translateY(-1px) scale(0.98);
    box-shadow: 0 5px 15px rgba(37, 211, 102, 0.4);
}

/* Animations */
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulseGlow {
    0%, 100% {
        box-shadow: 0 10px 25px rgba(37, 211, 102, 0.35);
    }
    50% {
        box-shadow: 0 10px 35px rgba(37, 211, 102, 0.6);
    }
}

/* Responsive Scaling for smaller screens */
@media (max-width: 480px) {
    .logo-container {
        max-width: 240px;
        margin-bottom: 40px;
    }
    .whatsapp-btn {
        padding: 14px 28px;
        font-size: 1rem;
        gap: 10px;
    }
    .whatsapp-btn svg {
        width: 22px;
        height: 22px;
    }
}