/* ==========================================================================
   CSS Variables Reference
   ==========================================================================
   📌 Font 관련
   --default-font-family
   --base-body-font-size
   --base-font-size
   --fs-body-base
   --fs-title-base
   --fs-primary-title
   --fs-title
   --fs-subtitle
   --fs-section-title
   --fs-section-subtitle
   --fs-body
   --fs-copyright

   📌 Width 관련
   --logo-width
   --default-container-width
   --default-content-width
   --default-container-width-small
   --default-content-width-small

   --max-container-width
   --max-content-width
   --max-container-width-small
   --max-content-width-small

   📌 Spacing 관련
   --default-container-padding
   --default-logo-margin
   --default-navbar-padding

   📌 Media Query에서 변경되는 변수
   - (1025px~1280px)
     --max-container-width
     --max-content-width
     --max-container-width-small
     --max-content-width-small

   - (769px~1024px)
     --max-container-width
     --max-content-width
     --max-container-width-small
     --max-content-width-small

   - (최대 768px)
     --fs-body-base
     --fs-title-base
     --max-container-width
     --max-content-width
     --max-container-width-small
     --max-content-width-small
================================================================== */

.inside:has(.hidden-comment) {
    display: none;
}



/* 공통 컨테이너 스타일 override */
.common-container {
	position: relative;
    * {
        word-break: keep-all;
    }
	h2, h3, h4, h5 {
		margin: 0;
	}
	padding: 4rem 0;
	.content-wrapper {
        width: var(--default-container-width);
        max-width: var(--max-container-width);
        padding: 0 calc(var(--default-container-padding) / 2);
		margin: 0 auto;
        display: block;
	}
    h2.content-title {
        text-align: center;
        font-weight: 800;
        margin-bottom: var(--fs-title);
        font-size: var(--fs-title);
        line-height: 1;
    }
    .content {
        border-radius: 1rem;
        min-height: calc(var(--lvh) * 50);
        margin-top: 2rem;
        display: flex;
        justify-content: center;
        align-items: center;
        flex: 1;
        width: 100%;
        h3 {
            font-size: var(--fs-subtitle);
            font-weight: 750;
            color: black;
        }
        a {
            color: #06c;
            &:hover {
                text-decoration: underline;
                font-size: var(--fs-body);
            }
        }
    }
}




.lesson.common-container {
    min-height: calc(var(--lvh) * 75);
    background: linear-gradient(135deg, 
        rgba(99, 102, 241, 0.1) 0%, 
        rgba(236, 72, 153, 0.1) 50%, 
        rgba(245, 158, 11, 0.1) 100%);
    display: flex;
    align-items: center;
    position: relative;

    /* Typography */
    h1 {
        font-size: var(--fs-primary-title);
        font-weight: 800;
    }

    h2 {
        font-size: var(--fs-title);
        font-weight: 700;
    }

    h3 {
        font-size: var(--fs-subtitle);
        font-weight: 700;
    }

    p {
        font-size: var(--fs-body);
    }

    .content {
        background: unset;
        display: grid;
        grid-template-columns: 1fr 1fr;
        grid-auto-rows: 1fr;
        gap: 4rem;
        min-height: 0;
        align-items: flex-start;
    }

    .content-text h1 {
        margin:0;
        margin-bottom: var(--fs-subtitle);
        background: var(--gradient);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }


    .content-text p {
        font-weight: 700;
        color: var(--text-dark);
        margin-bottom: 40px;
        line-height: 1.57;
        strong {
            font-weight: 700;
            color:black;
        }
    }

    .cta-button {
        background: var(--gradient);
        color: var(--white);
        padding: 0;
        border: none;
        border-radius: 50px;
        font-size: var(--fs-body);
        font-weight: 700;
        cursor: pointer;
        transition: all 0.3s ease;
        box-shadow: var(--shadow);
        display: inline-flex;
        align-items: center;
        gap: 8px;
        a {
            padding: 1rem 1.5rem;
            color: inherit;
            text-decoration: unset;
            &:hover {
                text-decoration: unset;
            }
        }
    }

    .cta-button:hover {
        transform: translateY(-3px);
        box-shadow: 0 35px 60px -12px rgba(0, 0, 0, 0.3);
    }

    .cta-button:active {
        transform: translateY(-1px);
    }

    .content-visual {
        display: flex;
        justify-content: center;
        align-items: center;
        border-radius: 1rem;
        overflow: hidden;
        color: var(--white);
        font-size: var(--fs-subtitle);
        font-weight: 700;
        box-shadow: var(--shadow);
        position: relative;
        height: 100%;
        img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
    }
}


.courses.common-container {
    padding-top: 4rem;
    background: linear-gradient(135deg, 
        rgba(99, 102, 241, 0.1) 0%, 
        rgba(236, 72, 153, 0.1) 50%, 
        rgba(245, 158, 11, 0.1) 100%);

    .content-wrapper {
        --card-padding-vertical: 1rem;
        display: grid;
        grid-template-columns: minmax(0, 1fr);
        max-width: var(--max-container-width);
    }

    h2.content-title {
        text-align: center;
        width: 100%;
        font-weight: 800;
        font-size: var(--fs-title);
        margin-bottom: var(--fs-title);
        color:black;
    }

    .courses-grid {
        --row-span: 3;
        --grid-card-count: 3;

        will-change: transform;
        transform: translateZ(0);
        display: grid;
        grid-template-columns: 1fr;
        grid-auto-rows: 1fr;
        min-height: calc(var(--lvh) * 60);
        height: fit-content;
    }
    .course-card {
        --fs-card-subtitle: calc(var(--fs-subtitle) * 1.25);
        transform: translateZ(0) scale(1.1);
        opacity: 0;
        will-change: transform, opacity;
        transform: translate3d(0, 0, 0);
        border-radius: 1rem;
        background-color: white;
        grid-column: 1;
        grid-row: 1 / span var(--grid-card-count);
        z-index: 1;
        transform-style: preserve-3d;
        transform-origin: center top;
        box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.125);
        padding: 2rem;
        display: flex;
        min-width: 0;
        width: 100%;
        flex-direction: column; 
        min-height: 0;
        max-height: 
        calc(
            (var(--lvh) * 100)
            - (var(--fs-title) * 2) 
            - (var(--header-height) + var(--card-padding-vertical))
            - (var(--card-padding-vertical) * 4)
        );
        height: 
        calc(
            (var(--lvh) * 100)
            - (var(--fs-title) * 2) 
            - (var(--header-height) + var(--card-padding-vertical))
            - (var(--card-padding-vertical) * 4)
        );
        overflow-y: hidden;
        /** 
         * max-height 계산
         * 100lvh로부터
         * - (var(--fs-title) * 2)            => Title의 Height과 Margin
         * - (var(--header-height) - 1rem)    => Top:0 기준으로 부모의 padding-top값(Header의 Height과 --card-padding-vertical만큼 계산)
         * - var(--card-padding-vertical)     => bottom padding을 위해 --card-padding-vertical * 2만큼 계산
         */

        h3 {
            font-size: var(--fs-card-subtitle);
            font-weight: 700;
            text-align: left;
        }
        h4 {
            font-size: var(--fs-copyright);
            margin-top: calc(var(--fs-subtitle) / 4);
            margin-bottom: calc(var(--fs-subtitle) / 2);
            font-weight: 700;
            color: var(--text-dark);
        }
        p {
            color: black;
            font-size: var(--fs-subtitle);
            line-height: 1.5;
            margin-bottom: 1rem;
        }
        .course-content {
            visibility: visible;
            content-visibility: visible;
            backface-visibility: hidden;
            will-change: transform;
            transform: translate3d(0, 0, 0);
            display: grid;
            grid-template-columns: repeat(12, 1fr);
            gap: min(4%, 2rem);
            height: 100%;
            .course-features {
                visibility: visible;
                content-visibility: visible;
                backface-visibility: hidden;
                will-change: transform;
                overflow-y: auto;
                pointer-events: none;
                grid-column: 1 / 6;
                grid-row: 1 / 2;
                list-style: none;
                padding: 0;
                p {
                    font-size: var(--fs-body);
                }
            }
            .course-image {
                visibility: visible;
                content-visibility: visible;
                backface-visibility: hidden;
                will-change: transform;
                transform: translate3d(0, 0, 0);
                overflow: hidden;
                grid-column: 6 / 13;
                grid-row: 1 / 2;
                img {
                    visibility: visible;
                    content-visibility: visible;
                    backface-visibility: hidden;
                    will-change: transform;
                    transform: translate3d(0, 0, 0);
                    width: 100%;
                    height: 100%;
                    object-fit: cover;
                    border-radius: 1rem;
                }
            }
        }
        &::before, &::after {
            z-index: 2;
            content: ' ';
            position: absolute;
            left: 0;
            width: 100%;
            height: 25%;
            pointer-events: none;
            opacity: 0;
            transition: opacity 0.3s ease-in-out;
        }
        &::before {
            background-image: linear-gradient(to bottom, rgba(255, 255, 255, 0.5) 20%, rgba(255, 255, 255, 0));
            top: 0;
        }
        &::after {
            background-image: linear-gradient(to top, rgba(255, 255, 255, 0.5) 20%, rgba(255, 255, 255, 0));
            bottom: 0;
        }
        &.scroll-to-down::after {
            opacity: 1;
        }
        &.scroll-to-up::before {
            opacity: 1;
        }
        &.visible .course-content  {
            .course-features {
                pointer-events: auto;
            }
        }
        &.partial-visible .course-content {
            .course-features {
                pointer-events: none;
            }
        }   
        &:nth-of-type(even) .course-content {
            .course-features {
                grid-column: 8 / 13;
            }
            .course-image {
                grid-column: 1 / 8;
            }
        }
    }
    .courses-replica {
        display: none;
    }
}

/* Process Section */
.process.common-container {
    background: var(--white);

    .content-wrapper {
    }

    .process-steps {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 3rem;
    }

    .step {
        text-align: center;
        padding: 2rem;
        background: rgba(99, 102, 241, 0.02);
        border-radius: 1rem;
        border: 1px solid rgba(99, 102, 241, 0.1);
        transition: all 0.3s ease;
    }

    .step:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    }

    .step-number {
        width: 60px;
        height: 60px;
        border-radius: 50%;
        background: var(--gradient);
        color: var(--white);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        font-weight: 800;
        margin: 0 auto 1.5rem;
    }

    .step h4 {
        font-size: var(--fs-copyright);
        font-weight: 700;
        margin-bottom: 1rem;
    }

    .step p {
        color: var(--text-light);
    }
}



/* Contact CTA */
.contact-cta {
    background: var(--gradient);
    text-align: center;
    color: var(--white);
}

.contact-cta .content-wrapper {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 40px;
}

.contact-cta h2 {
    font-weight: 800;
    margin-bottom: 1.5rem;
    font-size: var(--fs-title);
}

.contact-cta p {
    font-size: var(--fs-body);
    margin-bottom: 2.5rem;
    opacity: 0.9;
}

.contact-button {
    background: var(--white);
    color: var(--primary);
    padding: 1rem 2.5rem;
    border: none;
    border-radius: 50px;
    font-size: var(--fs-body);
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.contact-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

    

/* FAQ Section */
.faq.common-container {
    background: linear-gradient(135deg, 
        rgba(99, 102, 241, 0.05) 0%, 
        rgba(236, 72, 153, 0.05) 100%);

    .content-wrapper {
        max-width: 1000px;
        margin: 0 auto;
        padding: 0 40px;
    }

    .content-title {
        text-align: center;
        font-weight: 800;
        color: var(--text-primary);
    }

    .faq-container {
        display: flex;
        flex-direction: column;
        gap: 1rem;
    }

    .faq-item {
        background: var(--white);
        border-radius: 12px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        overflow: hidden;
        transition: all 0.3s ease;

        &:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
        }

        .faq-question {
            padding: 1rem 1.5rem;
            cursor: pointer;
            position: relative;
            background: var(--white);
            transition: all 0.3s ease;
            display: flex;
            gap:0.5rem;
            justify-content: space-between;
            align-items: center;
            flex-wrap: nowrap;
            &:hover {
                background: rgba(99, 102, 241, 0.05);
            }

            span {
                font-size: 1rem;
                font-weight: 800;
                color: var(--text-primary);
                line-height: 1.4;
            }
        }

        .faq-answer {
            max-height: 0;
            height: 0;
            overflow: hidden;
            background: rgba(248, 250, 252, 0.8);
            padding: 0 1.5rem;
            border-top: 1px solid #e5e7eb;

            p {
                color: var(--text-secondary);
                line-height: 1.6;
                margin: 0;
                padding: 0;
            }
        }
            .expand-icon {
                transition: transform 0.3s ease;
            }
        &.active {
            .faq-answer {
                max-height: fit-content;
                height: auto;
                padding: 1rem 1.5rem;
            }
            .expand-icon {
                transform: rotate(180deg);
            }
        }
    }

}



.course-replica-content {
    display: none;
}

/* Mobile Responsiveness */

@media (max-width: 768px) {
    
    .lesson.common-container {
        min-height: unset;
        padding:0;
        align-items: stretch;
        .content {
            min-height: 500px;
            display: grid;
            grid-template-columns: 1fr;
            gap: 4rem;
            align-items: center;
            margin:0;
            height: 100%;
        }
        .content-wrapper {
            padding: 0;
            max-width: 100%;
        }
        .content-text, .content-visual {
            grid-column: 1 / -1;
            grid-row: 1 / -1;
            height: fit-content;
            flex:1;
        }
        .content-text {
            z-index: 2;
            padding: 1rem;
        }
        .content-text p {
            color: var(--text-light);
            strong {
                color:white;
            }
        }
        .content-text h1 {
            margin-top:0;
        }
        .content-visual {
            width: 100%;
            height: 100%;
            height: calc(var(--lvh) * 100);
            z-index: 1;
            border-radius: 0;
            background: black;
            img {
                filter: brightness(0.5);
            }
        }
    }

    .courses.common-container {
        .courses-grid {

            .course-card, .courses-card:nth-last-of-type(even) {
                padding: 0;
                h3 {
                    font-size: calc(var(--fs-subtitle) * 1.125);
                    color:black;
                }
                h4 {
                    font-size: calc(var(--fs-subtitle) * 0.875);
                }
                .course-content {
                    gap: 1rem 0;
                    grid-template-rows: min-content 1fr;
                    padding: calc(var(--default-container-padding)) 0;
                }
                .course-image {
                    grid-column: 2 / 12;
                    grid-row: 2 / 3;
                    z-index: 0;
                    min-height: 0;
                    height: 100%;
                    overflow: hidden;
                    border-radius: 1rem;
                    button.view-more {
                        background-color: rgb(51,51,54);
                        width: 2rem;
                        height: 2rem;
                        border-radius: 50%;
                        display: flex;
                        align-items: center;
                        justify-content: center;
                        position: absolute;
                        bottom:0.5rem;
                        right:0.5rem;
                        z-index: 1;
                        span.material-symbols-outlined {
                            color:white
                        }
                    }
                    img {
                    }
                }

                .course-features {
                    padding: calc(var(--default-container-padding));
                    padding: 0;
                    height: 100%;
                    height: fit-content;
                    grid-column: 2 / 12;
                    grid-row: 1 / 2;
                    z-index: 1;
                    overflow: hidden;
                    display: flex;
                    flex-direction: column;
                    .course-description {
                        height: 100%;
                        overflow-y: hidden;
                        display: none;
                        p {
                            color: white;
                        }
                    }
                }
            }
        }
    }
    .courses-replica {
        .course-replica-content {
            * {
                margin:0;
            }
            display: flex;
            padding: 0;
            padding-top:calc(var(--header-height) + 1rem);
            background-color: rgba(0, 0, 0, 0);
            width: 100%;
            position: fixed;
            left: 50%;
            top: 0;
            height: 100%;
            transform: translateX(-50%);
            z-index: 1;
            overflow: hidden;
            backdrop-filter: blur(0px);
            transition: backdrop-filter .3s cubic-bezier(.4,0,.2,1), background-color .3s cubic-bezier(.4,0,.2,1);
            .card {
                display: flex;
                background-color: white;
                border-radius: 1rem 1rem 0 0;
                overflow: hidden;
                width: 100%;
                height: 100%;
                transform: translateY(100%);
                transition: transform .5s cubic-bezier(.4,0,0,1);
            }
            .card-scroll {
                display: grid;
                padding:1.5rem;
                grid-template-columns: minmax(0, 1fr);
                grid-auto-rows: minmax(0, min-content);
                height: fit-content;
                overflow-x: hidden;
                overflow-y: auto;
                height: 100%;
            }
            h3 {
                font-size: var(--fs-title);
                font-weight: 800;
                color:black;
                line-height: 1.47;
            }
            h4 {
                font-size: var(--fs-subtitle);
                font-weight: 700;
                color: var(--text-dark);
                line-height: 1.25;
            }
            .course-image {
                margin-top: 1rem;
                width: 100%;
                aspect-ratio: 16 / 9;
                img {
                    width: 100%;
                    height: 100%;
                    object-fit: cover;
                    object-position: center;
                    border-radius: 0.5rem;
                }
            }
            .course-texts {
                margin-top: 1rem;
                display: flex;
                gap:0.5rem;
                flex-direction: column;
                p {
                    line-height: 1.47;
                }
            }
            .close-replica {
                width: 1.75rem;
                height: 1.75rem;
                background-color: rgba(210,210,215,0.64);
                border-radius: 50%;
                display: flex;
                align-items: center;
                justify-content: center;
                position: absolute;
                top: 0.5rem;
                right: 0.5rem;
                z-index: 1;
                span {
                    font-size: 1.25rem;
                    pointer-events: none;
                    color:rgba(0,0,0,0.56);
                }
            }
        }
    }

    .courses-replica.entrance .course-replica-content {
        backdrop-filter: blur(16px);            
        background-color: rgba(0, 0, 0, 0.1);
        .card {
            transform: translateY(0);
        }
    }
    .courses-replica.out .course-replica-content {
        backdrop-filter: blur(0px);
        background-color: rgba(0, 0, 0, 0);
        .card {
            transform: translateY(100%);
        }
    }



}