/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('nasaimages/comic\ background.png');
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
    font-family: 'Poppins', sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Responsive header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background-color: rgba(39, 38, 38, 0.8);
    box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    min-height: 70px;
    flex-wrap: wrap;
}

.logo-container {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

#logo1,
#logo2 {
    width: 2.5rem;
    height: auto;
    margin-right: 0.5rem;
    cursor: pointer;
}

#hed1 {
    font-family: 'Comic Neue', cursive;
    color: bisque;
    font-size: 1.5rem;
    text-align: center;
    letter-spacing: 2px;
    flex-grow: 1;
    font-weight: 700;
    line-height: 1.2;
}

/* Responsive comic gallery layout */
.comic-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    padding: 2rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 120px;
}

.comic-panel {
    position: relative;
    overflow: hidden;
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    background-color: #fff;
    cursor: pointer;
}

.comic-panel:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
}

.comic-panel img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 15px;
    transition: transform 0.3s ease;
}

.comic-panel:hover img {
    transform: scale(1.05);
}

/* Responsive 3D flip card */
.card {
    width: 100%;
    max-width: 90vw;
    aspect-ratio: 16/10;
    min-height: 300px;
    max-height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 150rem;
    background: none;
    margin: 3rem auto;
    position: relative;
}

.card-side {
    height: 100%;
    width: 100%;
    border-radius: 15px;
    transition: all 0.8s ease;
    backface-visibility: hidden;
    position: absolute;
    top: 0;
    left: 0;
    padding: 1.5rem;
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.card-side.front {
    align-items: flex-start;
    text-align: left;
    justify-content: center;
    background: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
}

.card-side.back {
    align-items: flex-start;
    text-align: left;
    transform: rotateY(-180deg);
    background-color: #4158D0;
    background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('nasaimages/download\ \(2\).jpeg');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}

.card:hover .card-side.front {
    transform: rotateY(180deg);
}

.card:hover .card-side.back {
    transform: rotateY(0deg);
}

/* Card content styling */
#h1e {
    font-size: 2rem;
    margin: 0;
    letter-spacing: 4px;
    line-height: 1.2;
    font-weight: 700;
    text-align: left;
}

.card-side.back h1 {
    font-size: 1rem;
    margin-bottom: 1rem;
    line-height: 1.4;
    font-weight: 400;
    text-align: left;
}

#h2e {
    color: white;
    font-size: 0.9rem;
    font-weight: 400;
}

#h3e {
    font-size: 1.1rem;
    color: cadetblue;
    letter-spacing: 2px;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Mobile First - Extra Small devices (phones, up to 576px) */
@media (max-width: 575.98px) {
    .header {
        flex-direction: column;
        padding: 0.5rem;
        text-align: center;
        min-height: 100px;
        gap: 0.5rem;
    }

    .logo-container {
        order: 1;
    }

    #logo1,
    #logo2 {
        width: 1.8rem;
        margin-right: 0.3rem;
    }

    #hed1 {
        font-size: 0.8rem;
        letter-spacing: 1px;
        order: 2;
        text-align: center;
        line-height: 1.1;
    }

    .comic-gallery {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1rem 0.5rem;
        padding-top: 120px;
    }

    .comic-panel {
        border-radius: 10px;
    }

    .card {
        max-width: 95vw;
        min-height: 250px;
        aspect-ratio: 4/3;
        margin: 2rem auto;
    }

    .card-side {
        padding: 1rem;
    }

    #h1e {
        font-size: 1.2rem;
        letter-spacing: 2px;
        text-align: left;
    }

    .card-side.back h1 {
        font-size: 0.7rem;
        margin-bottom: 0.8rem;
        text-align: left;
    }

    #h3e {
        font-size: 0.8rem;
        letter-spacing: 1px;
    }

    #h2e {
        font-size: 0.7rem;
    }
}

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
    .header {
        flex-direction: row;
        padding: 0.75rem 1rem;
        min-height: 80px;
    }

    #logo1,
    #logo2 {
        width: 2rem;
        margin-right: 0.4rem;
    }

    #hed1 {
        font-size: 1rem;
        letter-spacing: 1px;
    }

    .comic-gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.2rem;
        padding: 1.5rem 1rem;
        padding-top: 100px;
    }

    .comic-panel {
        border-radius: 12px;
    }

    .card {
        max-width: 85vw;
        min-height: 280px;
        margin: 2.5rem auto;
    }

    .card-side {
        padding: 1.2rem;
    }

    #h1e {
        font-size: 1.4rem;
        letter-spacing: 3px;
        text-align: left;
    }

    .card-side.back h1 {
        font-size: 0.8rem;
        margin-bottom: 0.9rem;
        text-align: left;
    }

    #h3e {
        font-size: 0.9rem;
        letter-spacing: 1px;
    }

    #h2e {
        font-size: 0.8rem;
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991.98px) {
    .header {
        padding: 1rem 1.5rem;
        min-height: 80px;
    }

    #logo1,
    #logo2 {
        width: 2.5rem;
        margin-right: 0.6rem;
    }

    #hed1 {
        font-size: 1.2rem;
        letter-spacing: 2px;
    }

    .comic-gallery {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
        padding: 2rem 1.5rem;
        padding-top: 100px;
    }

    .comic-panel {
        border-radius: 15px;
    }

    .card {
        max-width: 75vw;
        min-height: 320px;
        margin: 3rem auto;
    }

    .card-side {
        padding: 1.5rem;
    }

    #h1e {
        font-size: 1.8rem;
        letter-spacing: 4px;
        text-align: left;
    }

    .card-side.back h1 {
        font-size: 0.9rem;
        margin-bottom: 1rem;
        text-align: left;
    }

    #h3e {
        font-size: 1rem;
        letter-spacing: 2px;
    }

    #h2e {
        font-size: 0.85rem;
    }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) and (max-width: 1199.98px) {
    .header {
        padding: 1rem 2rem;
        min-height: 90px;
    }

    #logo1,
    #logo2 {
        width: 3rem;
        margin-right: 0.8rem;
    }

    #hed1 {
        font-size: 1.4rem;
        letter-spacing: 3px;
    }

    .comic-gallery {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
        padding: 2.5rem 2rem;
        padding-top: 110px;
    }

    .comic-panel {
        border-radius: 15px;
    }

    .card {
        max-width: 65vw;
        min-height: 380px;
        margin: 3.5rem auto;
    }

    .card-side {
        padding: 2rem;
    }

    #h1e {
        font-size: 2.2rem;
        letter-spacing: 5px;
        text-align: left;
    }

    .card-side.back h1 {
        font-size: 1rem;
        margin-bottom: 1.2rem;
        text-align: left;
    }

    #h3e {
        font-size: 1.1rem;
        letter-spacing: 2px;
    }

    #h2e {
        font-size: 0.9rem;
    }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .header {
        padding: 1.2rem 2.5rem;
        min-height: 100px;
    }

    #logo1,
    #logo2 {
        width: 3.5rem;
        margin-right: 1rem;
    }

    #hed1 {
        font-size: 1.6rem;
        letter-spacing: 4px;
    }

    .comic-gallery {
        grid-template-columns: repeat(3, 1fr);
        gap: 2.5rem;
        padding: 3rem 2.5rem;
        padding-top: 120px;
    }

    .comic-panel {
        border-radius: 15px;
    }

    .card {
        max-width: 55vw;
        min-height: 420px;
        max-height: 500px;
        margin: 4rem auto;
    }

    .card-side {
        padding: 2.5rem;
    }

    #h1e {
        font-size: 2.5rem;
        letter-spacing: 6px;
        text-align: left;
    }

    .card-side.back h1 {
        font-size: 1.1rem;
        margin-bottom: 1.5rem;
        text-align: left;
    }

    #h3e {
        font-size: 1.2rem;
        letter-spacing: 3px;
    }

    #h2e {
        font-size: 1rem;
    }
}

/* Ultra-wide screens (1400px and up) */
@media (min-width: 1400px) {
    #hed1 {
        font-size: 1.8rem;
        letter-spacing: 5px;
    }

    .comic-gallery {
        gap: 3rem;
        padding: 3.5rem 3rem;
        padding-top: 130px;
    }

    .card {
        max-width: 50vw;
        min-height: 450px;
        max-height: 550px;
        margin: 4.5rem auto;
    }

    #h1e {
        font-size: 3rem;
        letter-spacing: 8px;
        text-align: left;
    }

    .card-side.back h1 {
        font-size: 1.2rem;
        text-align: left;
    }

    #h3e {
        font-size: 1.3rem;
        letter-spacing: 4px;
    }

    #h2e {
        font-size: 1.1rem;
    }
}

/* Responsive footer */
footer {
    background-color: rgba(51, 51, 51, 0.9);
    color: #fff;
    padding: 1.5rem;
    text-align: center;
    position: relative;
    bottom: 0;
    width: 100%;
    margin-top: 2rem;
}

/* Responsive scroll to top button */
#scrollTopBtn {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 1000;
    background-color: #8B5CF6;
    color: white;
    border: none;
    border-radius: 50%;
    padding: 0.8rem;
    font-size: 1rem;
    cursor: pointer;
    display: none;
    box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

#scrollTopBtn:hover {
    background-color: #7C3AED;
    transform: translateY(-2px);
    box-shadow: 0px 6px 16px rgba(0, 0, 0, 0.4);
}

body.scrolled #scrollTopBtn {
    display: block;
}

@media (max-width: 575.98px) {
    #scrollTopBtn {
        bottom: 1rem;
        right: 1rem;
        padding: 0.6rem;
        font-size: 0.9rem;
    }
    
    footer {
        padding: 1rem;
        font-size: 0.9rem;
    }
}