/* アートプロジェクト専用スタイル */
.art-hero {
    height: 100vh;
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('/api/placeholder/1920/1080');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 60px;
    position: relative;
    overflow: hidden;
}

.video-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.video-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.video-slide.active {
    opacity: 1;
}

.video-slide video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5));
    z-index: 2;
}

.art-hero-content {
    text-align: center;
    color: var(--white);
    max-width: 1200px;
    padding: 2rem;
    position: relative;
    z-index: 3;
}

.art-hero-content h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 2rem;
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.art-hero-content p {
    font-size: 1.5rem;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

/* セクション共通スタイル */
section {
    padding: 8rem 2rem;
    position: relative;
    overflow: hidden;
}

.section-content {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

/* システム紹介セクション */
.art-system {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
}

.system-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-top: 4rem;
}

.system-image {
    width: 80%;
    margin: 0 auto;
}

.system-image img {
    width: 100%;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.system-text {
    padding: 2rem;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin-top: 2rem;
}

.feature-list li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
}

/* AR機能紹介セクション */
.art-ar {
    background: linear-gradient(-135deg, #f8f9fa 0%, #ffffff 100%);
}

.ar-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 4rem;
    align-items: center;
}

.ar-text {
    order: 1;
}

.ar-device {
    order: 2;
    width: 100%;
}

.ar-device img {
    width: 80%;
    max-width: 50%;
    margin: 0 auto;
    display: block;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.ar-features {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.ar-feature {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.ar-feature:hover {
    transform: translateY(-5px);
}

.ar-feature h3 {
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.ar-feature p {
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.6;
}

/* プロセス紹介セクション */
.art-process {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 4rem;
}

.process-step {
    text-align: center;
    padding: 2rem;
    background: var(--white);
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    position: relative;
}

.step-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
    opacity: 0.1;
    position: absolute;
    top: 1rem;
    left: 1rem;
}

.process-step h3 {
    color: var(--primary);
    margin: 2rem 0 1rem;
    position: relative;
    z-index: 1;
}

/* お問い合わせセクション */
.art-contact {
    background: linear-gradient(-135deg, #f8f9fa 0%, #ffffff 100%);
    text-align: center;
}

.contact-content {
    max-width: 800px;
    margin: 4rem auto 0;
}

.contact-button {
    display: inline-block;
    padding: 1.5rem 4rem;
    margin-top: 2rem;
    background: var(--primary);
    color: var(--white);
    text-decoration: none;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(43, 91, 161, 0.2);
}

.contact-button:hover {
    transform: translateY(-5px);
    background: var(--primary-light);
    box-shadow: 0 15px 40px rgba(43, 91, 161, 0.3);
}

/* セクションタイトル共通スタイル */
.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
    position: relative;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--primary);
}

/* レスポンシブ対応 */
@media (max-width: 1200px) {
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .art-hero-content h1 {
        font-size: 2.5rem;
    }

    .art-hero-content p {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .system-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .system-image {
        width: 100%;
    }

    .ar-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .ar-device {
        order: 1;
    }

    .ar-text {
        order: 2;
    }

    .ar-feature {
        padding: 1.2rem;
    }

    .process-steps {
        grid-template-columns: 1fr;
    }

    .contact-button {
        padding: 1.2rem 3rem;
        font-size: 1.1rem;
    }

    section {
        padding: 6rem 1rem;
    }
}

/* アニメーション */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}