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

html,
body {
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    overflow-x: hidden;
    overflow-y: auto;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Background */
.background-video {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    pointer-events: none;
    z-index: -2;
}

.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.30);
    pointer-events: none;
    z-index: -1;
}

/* Main */
.landing-page {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 2.5rem 1.5rem;
}

/* Header */
.hero {
    margin-bottom: 2rem;
    animation: fadeDown 0.8s ease forwards;
    width: 100%;
    display: flex;
    justify-content: center;
}

.group-logo {
    width: clamp(240px, 40vw, 640px);
    user-select: none;
    -webkit-user-drag: none;
}

/* Cards */
.cards {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    width: 100%;
    max-width: 1300px;
    margin: 0 auto;
    animation: fadeUp 1.2s ease forwards;
}

.card {
    width: clamp(280px, 28vw, 380px);
    perspective: 1400px;
    text-decoration: none;
    cursor: pointer;
}

.card-inner {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 5;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.22, 0.61, 0.36, 1);
    will-change: transform;
}

@media (hover: hover) {
    .card:hover .card-inner {
        transform: rotateY(180deg);
    }
}

.card.active .card-inner {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    inset: 0;
    border-radius: 24px;
    overflow: hidden;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

/* Front card */
.card-front {
    display: flex;
    flex-direction: column;
    background: #ffffff;
    transform: rotateY(0deg);
    box-shadow: 0 20px 55px rgba(0, 0, 0, 0.28);
}

.card-logo-area {
    flex: 0 0 58%;
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.5rem;
    background: #ffffff;
}

.card-logo {
    width: 88%;
    height: 88%;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    object-position: center;
    user-select: none;
    -webkit-user-drag: none;
}

.card-info {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 1.35rem 1.5rem 1.2rem;
    background: rgba(75, 85, 92, 0.72);
    color: #ffffff;
}

.card-info h2 {
    margin: 0 0 0.45rem;
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(1rem, 1.55vw, 1.45rem);
    line-height: 1.15;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.card-info p {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(0.72rem, 1vw, 0.95rem);
    line-height: 1.3;
    font-style: italic;
    color: rgba(255, 255, 255, 0.95);
}

.card-info span {
    display: block;
    margin-top: auto;
    padding-top: 0.8rem;
    align-self: flex-end;
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(0.7rem, 0.95vw, 0.9rem);
    line-height: 1;
    font-style: italic;
    color: #ffffff;
    white-space: nowrap;
}

/* Back card */
.card-back {
    transform: rotateY(180deg);
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #0c1c40 0%, #234f93 45%, #ffffff 100%);
    color: #ffffff;
    font-size: clamp(1.25rem, 2vw, 2rem);
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.card-back span {
    position: relative;
    transition: letter-spacing 0.35s ease;
}

.card-back span::after {
    content: " →";
    transition: margin-left 0.35s ease;
}

@media (hover: hover) {
    .card:hover .card-back span {
        letter-spacing: 2px;
    }

    .card:hover .card-back span::after {
        margin-left: 8px;
    }
}

/* Responsive */
@media (max-width: 900px) {
    .cards {
        gap: 1.2rem;
    }

    .card {
        width: min(42vw, 340px);
    }

    .card-logo-area {
        padding: 1.5rem 1rem;
    }

    .card-info {
        padding: 1.1rem 1.1rem 1rem;
    }
}

@media (max-width: 640px) {
    .landing-page {
        padding: 1.5rem 1rem;
    }

    .hero {
        margin-bottom: 1rem;
    }

    .group-logo {
        width: min(78vw, 420px);
    }

    .cards {
        flex-direction: column;
        gap: 1.2rem;
        max-width: 360px;
    }

    .card {
        width: min(88vw, 340px);
    }

    .card-logo-area {
        flex-basis: 58%;
        padding: 1.5rem;
    }

    .card-info {
        padding: 1rem 1.15rem 0.9rem;
    }
}

/* Footer */
.footer {
    display: flex;
    justify-content: center;
    width: 100%;
    margin-top: auto;
    padding-top: 2rem;
    animation: fadeUp 1.4s ease forwards;
}

.copyright {
    width: clamp(260px, 60vw, 900px);
    user-select: none;
    -webkit-user-drag: none;
}

/* Animations */
@keyframes fadeDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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