@import url('https://fonts.googleapis.com/css2?family=Google+Sans:wght@400;500;700&family=Roboto:wght@300;400;500;700&display=swap');

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    min-height: 100vh;
    font-family: 'Google Sans', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #0f0f19;
    position: relative;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at top, #1e1b4b 0%, #0f0f19 50%, #0a0a12 100%);
    z-index: -2;
}

.background::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
    animation: breathe 8s ease-in-out infinite;
}

.background::after {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    top: -50%;
    left: -50%;
    background-image: 
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(139, 92, 246, 0.03) 2px, rgba(139, 92, 246, 0.03) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(59, 130, 246, 0.03) 2px, rgba(59, 130, 246, 0.03) 4px);
    animation: grid-move 20s linear infinite;
}

@keyframes breathe {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.1); }
}

@keyframes grid-move {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

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

.main-container {
    min-height: calc(100vh - 64px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1.5rem;
    position: relative;
    z-index: 1;
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease-out;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 50%, #c7d2fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
    font-family: 'Google Sans', sans-serif;
    line-height: 1.2;
}

.page-header p {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 400;
    max-width: 700px;
    margin: 0 auto;
}

.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    width: 100%;
    padding-bottom: 2rem;
}

.card-wrapper {
    width: 100%;
    height: 420px;
    perspective: 1000px;
    animation: fadeInUp 0.8s ease-out backwards;
}

.card-wrapper:nth-child(1) { animation-delay: 0.1s; }
.card-wrapper:nth-child(2) { animation-delay: 0.2s; }
.card-wrapper:nth-child(3) { animation-delay: 0.3s; }
.card-wrapper:nth-child(4) { animation-delay: 0.4s; }

.card-item {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.card-wrapper:hover .card-item {
    transform: rotateY(180deg);
}

.card-wrapper.selected .card-item {
    transform: scale(1.05);
}

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 20px;
    overflow: hidden;
    background: rgba(30, 27, 75, 0.4);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(139, 92, 246, 0.2);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-front {
    display: flex;
    flex-direction: column;
}

.card-back {
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2.5rem;
    text-align: center;
}

.card-wrapper:hover .card-front,
.card-wrapper:hover .card-back {
    box-shadow: 
        0 12px 48px rgba(0, 0, 0, 0.6),
        0 0 0 1px rgba(139, 92, 246, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.card-wrapper.selected .card-front,
.card-wrapper.selected .card-back {
    box-shadow: 
        0 16px 64px rgba(139, 92, 246, 0.4),
        0 0 0 2px rgba(139, 92, 246, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.card-image-section {
    width: 100%;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 1rem;
}

.card-wrapper.card-blue .card-image-section {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.3) 0%, rgba(37, 99, 235, 0.2) 100%);
}

.card-wrapper.card-green .card-image-section {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.3) 0%, rgba(5, 150, 105, 0.2) 100%);
}

.card-wrapper.card-orange .card-image-section {
    background: linear-gradient(135deg, rgba(251, 146, 60, 0.3) 0%, rgba(249, 115, 22, 0.2) 100%);
}

.card-wrapper.card-purple .card-image-section {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.3) 0%, rgba(147, 51, 234, 0.2) 100%);
}

.robot-image {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    filter: drop-shadow(0 4px 16px rgba(139, 92, 246, 0.3));
    display: block;
    transition: transform 0.3s ease;
}

.card-wrapper:hover .robot-image {
    transform: scale(1.05);
}

.card-content-section {
    padding: 1.5rem;
    background: rgba(15, 15, 25, 0.6);
    backdrop-filter: blur(10px);
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    border-top: 1px solid rgba(139, 92, 246, 0.1);
}

.card-title {
    color: #ffffff;
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    text-align: left;
    font-family: 'Google Sans', sans-serif;
    line-height: 1.3;
}

.card-description {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    text-align: left;
    line-height: 1.6;
    font-weight: 400;
}

.card-back-content {
    color: #ffffff;
}

.card-back-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
    font-family: 'Google Sans', sans-serif;
    color: #ffffff;
}

.card-back-text {
    font-size: 1rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.card-back-features {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem 0;
    text-align: left;
    width: 100%;
}

.card-back-features li {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0.75rem;
    padding-left: 1.75rem;
    position: relative;
    font-weight: 400;
}

.card-back-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    font-weight: 700;
    font-size: 1.125rem;
}

.card-wrapper.card-blue .card-back-features li::before {
    color: #3b82f6;
}

.card-wrapper.card-green .card-back-features li::before {
    color: #10b981;
}

.card-wrapper.card-orange .card-back-features li::before {
    color: #fb923c;
}

.card-wrapper.card-purple .card-back-features li::before {
    color: #a855f7;
}

.card-back-button {
    margin-top: auto;
    padding: 0.75rem 2rem;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2) 0%, rgba(59, 130, 246, 0.2) 100%);
    border: 1px solid rgba(139, 92, 246, 0.4);
    border-radius: 30px;
    color: #ffffff;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Google Sans', sans-serif;
    letter-spacing: 0.5px;
    backdrop-filter: blur(10px);
}

.card-back-button:hover {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.4) 0%, rgba(59, 130, 246, 0.4) 100%);
    border-color: rgba(139, 92, 246, 0.6);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.3);
}

.card-wrapper.card-blue .card-back-button {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.3) 0%, rgba(37, 99, 235, 0.2) 100%);
    border-color: rgba(59, 130, 246, 0.5);
}

.card-wrapper.card-blue .card-back-button:hover {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.5) 0%, rgba(37, 99, 235, 0.4) 100%);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
}

.card-wrapper.card-green .card-back-button {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.3) 0%, rgba(5, 150, 105, 0.2) 100%);
    border-color: rgba(16, 185, 129, 0.5);
}

.card-wrapper.card-green .card-back-button:hover {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.5) 0%, rgba(5, 150, 105, 0.4) 100%);
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.4);
}

.card-wrapper.card-orange .card-back-button {
    background: linear-gradient(135deg, rgba(251, 146, 60, 0.3) 0%, rgba(249, 115, 22, 0.2) 100%);
    border-color: rgba(251, 146, 60, 0.5);
}

.card-wrapper.card-orange .card-back-button:hover {
    background: linear-gradient(135deg, rgba(251, 146, 60, 0.5) 0%, rgba(249, 115, 22, 0.4) 100%);
    box-shadow: 0 8px 24px rgba(251, 146, 60, 0.4);
}

.card-wrapper.card-purple .card-back-button {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.3) 0%, rgba(147, 51, 234, 0.2) 100%);
    border-color: rgba(168, 85, 247, 0.5);
}

.card-wrapper.card-purple .card-back-button:hover {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.5) 0%, rgba(147, 51, 234, 0.4) 100%);
    box-shadow: 0 8px 24px rgba(168, 85, 247, 0.4);
}

.card-checkmark {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(15, 15, 25, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
    border: 2px solid;
}

.card-wrapper.selected .card-checkmark {
    opacity: 1;
    transform: scale(1);
}

.card-checkmark::after {
    content: '✓';
    font-size: 1.125rem;
    font-weight: 700;
}

.card-wrapper.card-blue .card-checkmark {
    border-color: #3b82f6;
}

.card-wrapper.card-blue .card-checkmark::after {
    color: #3b82f6;
}

.card-wrapper.card-green .card-checkmark {
    border-color: #10b981;
}

.card-wrapper.card-green .card-checkmark::after {
    color: #10b981;
}

.card-wrapper.card-orange .card-checkmark {
    border-color: #fb923c;
}

.card-wrapper.card-orange .card-checkmark::after {
    color: #fb923c;
}

.card-wrapper.card-purple .card-checkmark {
    border-color: #a855f7;
}

.card-wrapper.card-purple .card-checkmark::after {
    color: #a855f7;
}

/* Responsywność */
@media (max-width: 1200px) {
    .cards-container {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 1.5rem;
    }

    .card-wrapper {
        height: 400px;
    }

    .card-image-section {
        height: 180px;
    }
}

@media (max-width: 768px) {
    body {
        padding-top: 64px;
    }

    .main-container {
        padding: 2rem 1rem;
        min-height: auto;
    }

    .page-header {
        margin-bottom: 2rem;
    }

    .page-header h1 {
        font-size: 2rem;
        letter-spacing: -0.5px;
    }

    .page-header p {
        font-size: 1rem;
    }

    .cards-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding-bottom: 1rem;
    }

    .card-wrapper {
        max-width: 100%;
        height: 380px;
    }

    .card-wrapper.selected .card-item {
        transform: scale(1.02);
    }

    .card-image-section {
        height: 170px;
    }

    .card-content-section {
        padding: 1.25rem;
    }

    .card-title {
        font-size: 1.25rem;
    }

    .card-back {
        padding: 2rem 1.5rem;
    }

    .card-back-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .page-header h1 {
        font-size: 1.75rem;
    }

    .card-wrapper {
        height: 360px;
    }

    .card-image-section {
        height: 150px;
    }
}