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

body {
    font-family: 'Montserrat', sans-serif;
    background-color: #000;
    background-image: url('img/bg.png');
    background-size: 100% auto;
    background-position: center 0px;
    background-repeat: no-repeat;
    min-height: 100vh;
    max-width: 1500px;
    margin: 0 auto;
}

.content-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.left-content {
    flex: 1;
}

.header {
    display: flex;
    align-items: center;
    margin-top: 85px;
}

.logo {
    display: block;
}

.title {
    font-family: 'Montserrat', sans-serif;
    font-size: 48px;
    font-weight: 400;
    margin-left: 60px;
    white-space: nowrap;
    background: linear-gradient(to right, #575757 0%, #919191 67%, #FFFFFF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-family: 'Montserrat', sans-serif;
    font-size: 82px;
    font-weight: 400;
    color: #FFFFFF;
    margin-top: 320px;
    line-height: 1.2;
}

.subtitle-text {
    font-family: 'Montserrat', sans-serif;
    font-size: 31px;
    font-weight: 400;
    color: #FFFFFF;
    margin-top: 26px;
}

.right-content {
    display: flex;
    justify-content: flex-end;
    align-items: flex-start;
}

.intro-image {
    display: block;
    max-width: 100%;
    height: auto;
    margin-top: 265px;
}

.description-wrapper {
    text-align: center;
    margin: 25px auto 0;
    max-width: 1100px;
}

.description-text {
    font-family: 'Montserrat', sans-serif;
    font-size: 42px;
    font-weight: 400;
    text-align: center;
    margin: 0;
    max-width: 1100px;
    background: linear-gradient(to right, #5D5D5D 0%, #FFFFFF 50%, #5D5D5D 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nightstar-word {
    font-size: 62px;
    color: #FFFFFF;
    -webkit-text-fill-color: #FFFFFF;
    background: none;
    -webkit-background-clip: unset;
    background-clip: unset;
}

.presentation-btn {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", sans-serif;
    font-size: 36px;
    font-weight: 500;
    color: #000;
    background-color: #969696;
    border: none;
    padding: 30px 60px;
    margin: 55px auto 0;
    display: block;
    cursor: pointer;
    position: relative;
    border-radius: 999px;
    transition: background-color 0.3s ease;
    text-decoration: none;
    width: fit-content;
}

.presentation-btn:hover {
    background-color: #FFFFFF;
}

.presentation-btn::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(to right, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 1), rgba(255, 255, 255, 0.8));
    border-radius: 999px;
    z-index: -1;
}

.services-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 102px;
    margin-top: 160px;
    padding: 0;
}

.service-card {
    flex: 1;
    background: rgba(51, 51, 51, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 40px;
    max-width: 650px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.service-card-first {
    flex: 0 1 auto;
    align-self: flex-start;
}

.service-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 84px;
    font-weight: 400;
    margin-bottom: 20px;
    background: linear-gradient(to right, #FFFFFF 0%, #999999 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.service-price {
    font-family: 'Montserrat', sans-serif;
    font-size: 52px;
    font-weight: 400;
    color: #FFFFFF;
    margin-bottom: 30px;
}

.service-description {
    font-family: 'Montserrat', sans-serif;
    font-size: 28px;
    font-weight: 400;
    color: #CCCCCC;
    line-height: 1.6;
    margin-bottom: 70px;
}

.service-btn {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", sans-serif;
    font-size: 36px;
    font-weight: 500;
    color: #000;
    background-color: #969696;
    border: none;
    padding: 30px 60px;
    border-radius: 999px;
    cursor: pointer;
    display: inline-block;
    text-decoration: none;
    position: relative;
    transition: background-color 0.3s ease;
}

.service-btn:hover {
    background-color: #FFFFFF;
}

.service-btn::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(to right, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 1), rgba(255, 255, 255, 0.8));
    border-radius: 999px;
    z-index: -1;
}

.materials-section {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-top: 140px;
    gap: 60px;
}

.materials-content {
    flex: 1;
}

.materials-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 84px;
    font-weight: 400;
    color: #FFFFFF;
    line-height: 1.2;
    margin-bottom: 30px;
}

.materials-subtitle {
    font-family: 'Montserrat', sans-serif;
    font-size: 32px;
    font-weight: 400;
    color: #CCCCCC;
    line-height: 1.6;
    margin-bottom: 30px;
}

.materials-btn {
    margin: 0;
    display: inline-block;
}

.materials-image {
    display: flex;
    align-items: flex-start;
    margin-top: 0;
}

.books-image {
    display: block;
    max-width: 100%;
    height: auto;
}

.education-text {
    font-family: 'Montserrat', sans-serif;
    font-size: 62px;
    font-weight: 400;
    text-align: center;
    margin-top: 150px;
    background: linear-gradient(to right, #5A5A5A 0%, #5A5A5A 35%, #ffffff8c 50%, #5A5A5A 65%, #5A5A5A 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.social-section {
    display: flex;
    gap: 30px;
    align-items: center;
    justify-content: center;
    margin-top: 200px;
    margin-bottom: 100px;
    flex-wrap: wrap;
}

.social-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0;
    box-sizing: border-box;
    transition: transform 0.3s ease;
    text-decoration: none;
    cursor: pointer;
}

.social-card:hover {
    transform: translateY(-5px);
}

.social-card-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    padding: 20px;
    box-sizing: border-box;
}

.social-card-rect {
    width: 300px;
    height: 150px;
    border-radius: 20px;
    padding: 20px;
    box-sizing: border-box;
}

.social-icon {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    margin-bottom: 20px;
}

.social-label {
    font-family: 'Montserrat', sans-serif;
    font-size: 24px;
    font-weight: 400;
    color: #CCCCCC;
    text-align: center;
    margin: 0;
}

.youtube-text {
    font-family: 'Mina', sans-serif;
    font-size: 48px;
    font-weight: 400;
    text-align: center;
    margin-top: 20px;
    background: linear-gradient(to right, #5A5A5A 0%, #5A5A5A 35%, #ffffff8c 50%, #5A5A5A 65%, #5A5A5A 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.spacer {
    height: 200vh;
}

@media (min-width: 1025px) and (max-width: 1500px) {
    body {
        padding: 0 30px;
    }

    .logo {
        max-width: 180px;
    }

    .title {
        font-size: 40px;
        margin-left: 40px;
    }

    .intro-image {
        max-width: 500px;
        width: 100%;
        height: auto;
    }

    .books-image {
        max-width: 500px;
        width: 100%;
        height: auto;
    }

    .education-text {
        font-size: 48px;
        margin-top: 100px;
    }

    .social-section {
        margin-top: 120px;
        margin-bottom: 80px;
        gap: 20px;
    }

    .social-card-circle {
        width: 120px;
        height: 120px;
        padding: 18px;
    }

    .social-card-rect {
        width: 240px;
        height: 120px;
        padding: 18px;
    }

    .social-icon {
        width: 100%;
        height: 100%;
        margin-bottom: 12px;
    }

    .social-label {
        font-size: 20px;
    }

    .youtube-text {
        font-size: 36px;
    }

    .service-card {
        max-width: 550px;
    }

    .materials-section {
        gap: 40px;
    }
}

@media (max-width: 1024px) {
    body {
        padding: 0 20px;
    }

    .header {
        margin-top: 40px;
        flex-wrap: wrap;
    }

    .logo {
        max-width: 120px;
    }

    .title {
        font-size: 32px;
        margin-left: 20px;
    }

    .subtitle {
        font-size: 56px;
        margin-top: 100px;
    }

    .subtitle-text {
        font-size: 24px;
    }

    .intro-image {
        margin-top: 100px;
        max-width: 400px;
        width: 100%;
        height: auto;
    }

    .logo {
        max-width: 150px;
    }

    .description-text {
        font-size: 28px;
        padding: 0 20px;
    }

    .nightstar-word {
        font-size: 42px;
    }

    .presentation-btn {
        font-size: 24px;
        padding: 25px 50px;
    }

    .services-container {
        flex-direction: column;
        align-items: center;
        gap: 40px;
        margin-top: 80px;
    }

    .service-card {
        max-width: 100%;
        padding: 30px;
    }

    .service-title {
        font-size: 56px;
    }

    .service-price {
        font-size: 36px;
    }

    .service-description {
        font-size: 20px;
    }

    .service-btn {
        font-size: 24px;
        padding: 25px 50px;
    }

    .materials-section {
        flex-direction: column;
        margin-top: 80px;
        gap: 40px;
    }

    .materials-title {
        font-size: 56px;
    }

    .materials-subtitle {
        font-size: 24px;
    }

    .materials-image {
        justify-content: center;
    }

    .books-image {
        max-width: 400px;
        width: 100%;
        height: auto;
    }

    .education-text {
        font-size: 42px;
        margin-top: 80px;
    }

    .social-section {
        margin-top: 100px;
        margin-bottom: 80px;
        gap: 20px;
    }

    .social-card-circle {
        width: 120px;
        height: 120px;
        padding: 15px;
    }

    .social-card-rect {
        width: 210px;
        height: 120px;
        padding: 15px;
    }

    .social-icon {
        width: 100%;
        height: 100%;
        margin-bottom: 12px;
    }

    .social-label {
        font-size: 18px;
    }

    .youtube-text {
        font-size: 32px;
    }
}

@media (max-width: 760px) {
    body {
        padding: 0 15px;
    }

    .header {
        margin-top: 30px;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .logo {
        max-width: 120px;
        margin-bottom: 15px;
    }

    .title {
        font-size: 24px;
        margin-left: 0;
        white-space: normal;
        text-align: center;
    }

    .left-content {
        text-align: center;
    }

    .subtitle {
        font-size: 42px;
        margin-top: 60px;
        text-align: center;
    }

    .subtitle-text {
        font-size: 20px;
        text-align: center;
    }

    .content-wrapper {
        flex-direction: column;
        align-items: center;
    }

    .right-content {
        justify-content: center;
        margin-top: 40px;
        width: 100%;
    }

    .intro-image {
        margin-top: 0;
        max-width: 300px;
        width: 100%;
        height: auto;
    }

    .description-text {
        font-size: 20px;
        padding: 0 15px;
        margin-top: 40px;
        text-align: center;
    }

    .nightstar-word {
        font-size: 32px;
    }

    .presentation-btn {
        font-size: 20px;
        padding: 20px 40px;
        margin-top: 30px;
        width: 100%;
        text-align: center;
    }

    .services-container {
        margin-top: 60px;
        gap: 30px;
        align-items: center;
    }

    .service-card {
        padding: 25px;
        text-align: center;
    }

    .service-title {
        font-size: 42px;
        margin-bottom: 15px;
        text-align: center;
    }

    .service-price {
        font-size: 28px;
        margin-bottom: 20px;
        text-align: center;
    }

    .service-description {
        font-size: 18px;
        margin-bottom: 40px;
        text-align: center;
    }

    .service-btn {
        font-size: 20px;
        padding: 20px 40px;
        width: 100%;
        text-align: center;
    }

    .materials-section {
        margin-top: 60px;
        gap: 30px;
        align-items: center;
    }

    .materials-content {
        text-align: center;
    }

    .materials-title {
        font-size: 42px;
        margin-bottom: 20px;
        text-align: center;
    }

    .materials-subtitle {
        font-size: 18px;
        margin-bottom: 25px;
        text-align: center;
    }

    .materials-btn {
        width: 100%;
        text-align: center;
    }

    .materials-image {
        justify-content: center;
    }

    .books-image {
        max-width: 300px;
        width: 100%;
        height: auto;
    }

    .education-text {
        font-size: 32px;
        margin-top: 60px;
    }

    .social-section {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        margin-top: 80px;
        margin-bottom: 60px;
        gap: 15px;
        justify-items: center;
        max-width: 100%;
    }

    .social-card-circle {
        width: 150px;
        height: 150px;
        padding: 15px;
    }

    .social-card-rect {
        width: 150px;
        height: 117px;
        padding: 15px;
    }

    .social-icon {
        width: 100%;
        height: 100%;
        margin-bottom: 10px;
    }

    .social-label {
        font-size: 16px;
    }

    .youtube-text {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .subtitle {
        font-size: 32px;
        margin-top: 40px;
    }

    .subtitle-text {
        font-size: 18px;
    }

    .description-text {
        font-size: 18px;
    }

    .nightstar-word {
        font-size: 28px;
    }

    .presentation-btn {
        font-size: 18px;
        padding: 18px 30px;
    }

    .service-title {
        font-size: 36px;
    }

    .service-price {
        font-size: 24px;
    }

    .service-description {
        font-size: 16px;
    }

    .service-btn {
        font-size: 18px;
        padding: 18px 30px;
    }

    .materials-title {
        font-size: 36px;
    }

    .materials-subtitle {
        font-size: 16px;
    }

    .education-text {
        font-size: 28px;
        margin-top: 40px;
    }

    .social-section {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        margin-top: 60px;
        margin-bottom: 50px;
        gap: 10px;
        justify-items: center;
        max-width: 100%;
    }

    .social-card-circle {
        width: 120px;
        height: 120px;
        padding: 12px;
    }

    .social-card-rect {
        width: 120px;
        height: 93px;
        padding: 12px;
    }

    .social-icon {
        width: 100%;
        height: 100%;
        margin-bottom: 8px;
    }

    .social-label {
        font-size: 14px;
    }

    .youtube-text {
        font-size: 24px;
    }
}