@keyframes cat_move {
    from {
        transform: rotateZ(-10deg);
    }

    to {
        transform: rotateZ(10deg);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

* {
    box-sizing: border-box;
}

.yomogi-regular {
    font-family: "Yomogi", cursive;
    font-weight: 400;
    font-style: normal;
}

ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

h3 {
    margin: 0;
}

body {
    margin: 0;
    line-height: 1.6;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

/* Header styles */
.site-header {
    position: relative;
    width: 100%;
    background: linear-gradient(135deg, #5680c3 0%, #4a6fa5 50%, #3e5a8a 100%);
    background-image: url(/catgpt/assets/img/bd.png);
    background-size: cover;
    background-position: center;
    color: #fff;
    z-index: -1;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.header-title {
    font-family: "vdl-megamarupop-futoline", sans-serif;
    font-weight: 400;
    font-style: normal;
    text-align: center;
    padding-top: 10%;
    padding-bottom: 14%;
    animation: fadeInUp 1s ease-out;
}

.header-title img {
    width: 72vw;
    max-width: 480px;
    filter: drop-shadow(0 4px 16px rgba(0, 0, 0, 0.2));
    transition: transform 0.3s ease;
}

.header-title img:hover {
    transform: scale(1.02);
}

.site-header .cats {
    position: absolute;
    bottom: 3%;
    width: 100%;
}

.site-header .cats ul {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    width: 30%;
    margin: 0 auto;
}

.site-header .cats ul li img {
    display: block;
    animation: cat_move 1.8s infinite cubic-bezier(0.65, 0.05, 0.36, 1) 0s alternate;
    transform-origin: bottom;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.15));
    transition: transform 0.3s ease;
}

.site-header .cats ul li:hover img {
    transform: scale(1.1);
    animation-play-state: paused;
}

/* Header group styles */
.header-group {
    width: 100%;
    position: relative;
    overflow: hidden;
}

.header-group::before {
    content: "";
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #cacfa21a 0%, #b8c8a330 100%);
    border-top-left-radius: 50%;
    border-top-right-radius: 50%;
    position: absolute;
    top: 80%;
    z-index: -1;
}

.header-group::after {
    content: "";
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #b8fbdd 0%, #a5f2d0 100%);
    border-top-left-radius: 50%;
    border-top-right-radius: 50%;
    position: absolute;
    top: 88%;
    z-index: -1;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.1);
}

.header-subtitle {
    padding: 0;
    margin: 0;
    font-size: 0.75rem;
    font-weight: normal;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Main content styles */
.main-content {
    margin: 0;
    padding: 0;
}

/* Footer styles */
.site-footer {
    background: linear-gradient(135deg, #ddceb6 0%, #d4c4a8 100%);
    text-align: center;
    padding: 32px 0 16px;
    color: #333;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.1);
}

.site-footer a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.site-footer a:hover {
    color: #5680c3;
}

/* Section title styles */
.section-title {
    text-align: center;
    text-decoration-thickness: 3px;
    text-decoration-color: #e5c872;
    text-decoration-style: wavy;
    text-decoration-line: underline;
    text-underline-offset: 16px;
    padding: 0;
    margin: 0 0 64px;
    font-family: "Yomogi", cursive;
    font-weight: 400;
    font-style: normal;
    font-size: 1.8rem;
    color: #2d3748;
    position: relative;
}

.section-title::before,
.section-title::after {
    content: "\01f43e";
    display: inline;
    font-size: 1.2em;
    margin: 0 8px;
    animation: pulse 2s infinite ease-in-out;
}

.header-cat {
    position: relative;
    z-index: 2;
    margin: 0;
    padding: 20px 24px 16px;
    background: linear-gradient(135deg, rgba(113, 128, 150, 0.12) 0%, rgba(113, 128, 150, 0.08) 100%);
    border-bottom: 2px solid #718096;
    border-radius: 20px 20px 0 0;
}

.header-cat::before {
    content: "\01f408";
    display: inline;
    filter: contrast(0%) sepia(100%) hue-rotate(349deg);
    margin: 0 8px 0 12px;
    font-size: 1.2em;
    animation: float 2s infinite ease-in-out;
}

.image-dressup {
    width: 180px;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-dressup:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.image-snack {
    width: 320px;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-snack:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.captures {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8%;
    padding: 0 10%;
    font-size: 0.65rem;
    margin: 32px 0;
}

.captures li {
    justify-self: center;
    text-align: center;
    background: linear-gradient(135deg, #ffffff 0%, #f8fbff 100%);
    border-radius: 20px;
    padding: 20px 16px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    border: 2px solid rgba(135, 206, 235, 0.15);
    transition: all 0.3s ease;
}

.captures li:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
    border-color: rgba(135, 206, 235, 0.3);
}

.captures li img {
    max-height: 400px;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    width: 100%;
    object-fit: cover;
}

.captures li:hover img {
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.captures li div {
    margin-top: 16px;
    font-weight: 600;
    color: #4a5568;
    font-size: 0.9rem;
    line-height: 1.4;
}

.store-link {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding: 40px 5%;
    margin: 48px 0;
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.8) 0%, rgba(237, 242, 247, 0.6) 100%);
    border-radius: 20px;
    position: relative;
    border: 2px solid rgba(229, 200, 114, 0.2);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    align-items: center;
    justify-items: center;
}

.store-link div {
    place-self: center;
    transition: transform 0.3s ease;
    max-width: 250px;
}

.store-link div:hover {
    transform: translateY(-4px);
}

.store-link .apple {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 80px;
}

.store-link .apple img {
    height: 60px;
    width: 180px;
    object-fit: contain;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.1));
    transition: filter 0.3s ease;
}

.store-link .apple img:hover {
    filter: drop-shadow(0 6px 16px rgba(0, 0, 0, 0.15));
}

.store-link .google img {
    height: 60px;
    width: 180px;
    object-fit: contain;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.1));
    transition: filter 0.3s ease;
}

.store-link .google img:hover {
    filter: drop-shadow(0 6px 16px rgba(0, 0, 0, 0.15));
}

.center-text {
    text-align: center;
    line-height: 1.6;
    font-size: 1.15rem;
    color: #2d3748;
    margin-bottom: 32px;
}

.center-text p {
    margin: 8px 0;
    font-weight: 400;
}

.left-text {
    padding: 0 16px;
    line-height: 1.7;
    font-size: 1rem;
    color: #4a5568;
    margin-bottom: 24px;
}

.left-text p {
    margin: 12px 0;
}

.column3 {
    margin-top: 32px;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 24px;
}

/* セクション内のコンテンツを制限幅にするためのコンテナ */
.section-container {
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 16px;
}

/* 各セクションのタイトルとコンテンツに適用 */
.intro .section-container,
.neko-showkai .section-container,
.features-section .section-container,
.tech-features .section-container,
.voice-cat .section-container {
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 16px;
}

/* store-linkも制限 */
.store-link {
    max-width: 1024px;
    margin-left: auto;
    margin-right: auto;
}

/* ヘッダーのスタイルを調整 - 比率を保つために制限なし */

/* Section backgrounds with clear separation */
.intro {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    padding: 0 0 64px;
    position: relative;
    overflow: hidden;
    margin-bottom: 32px;
    border-bottom: 3px solid rgba(229, 200, 114, 0.2);
}

.intro::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(245, 208, 114, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(173, 216, 230, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.neko-showkai {
    background: linear-gradient(135deg, #fff8f0 0%, #fef4e6 100%);
    padding: 48px 0 64px;
    position: relative;
    overflow: hidden;
    margin: 32px 0;
    border-top: 3px solid rgba(255, 182, 193, 0.3);
    border-bottom: 3px solid rgba(255, 182, 193, 0.3);
}

.neko-showkai::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 70% 30%, rgba(229, 200, 114, 0.08) 0%, transparent 60%),
        radial-gradient(circle at 30% 70%, rgba(255, 182, 193, 0.06) 0%, transparent 60%);
    pointer-events: none;
}

.features-section {
    background: linear-gradient(135deg, #f0f8ff 0%, #e6f3ff 100%);
    padding: 48px 0 64px;
    position: relative;
    overflow: hidden;
    margin: 32px 0;
    border-top: 3px solid rgba(135, 206, 235, 0.3);
    border-bottom: 3px solid rgba(135, 206, 235, 0.3);
}

.features-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 10% 20%, rgba(135, 206, 235, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 90% 80%, rgba(173, 216, 230, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.voice-cat {
    background: linear-gradient(135deg, #f5f8fa 0%, #edf2f7 100%);
    padding: 48px 0 64px;
    position: relative;
    overflow: hidden;
    margin: 32px 0;
    border-top: 3px solid rgba(160, 174, 192, 0.3);
    border-bottom: 3px solid rgba(160, 174, 192, 0.3);
}

.voice-cat::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 25% 75%, rgba(160, 174, 192, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 75% 25%, rgba(203, 213, 224, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.tech-features {
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
    padding: 48px 0 64px;
    position: relative;
    overflow: hidden;
    margin: 32px 0;
    border-top: 3px solid rgba(113, 128, 150, 0.3);
    border-bottom: 3px solid rgba(113, 128, 150, 0.3);
}

.tech-features::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 60% 40%, rgba(113, 128, 150, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 60%, rgba(160, 174, 192, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.intro-title {
    position: relative;
    z-index: 2;
    font-size: 2.4rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    font-family: "Yomogi", cursive;
    color: #2d3748;
    text-shadow: 0 2px 8px rgba(229, 200, 114, 0.3);
}

.intro .center-text {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 600px;
    margin: 0 auto 48px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 32px 24px;
    border: 1px solid rgba(229, 200, 114, 0.3);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.intro .center-text p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: #2d3748;
    margin: 8px 0;
    font-family: "Yomogi", cursive;
}

.intro .center-text p:first-child {
    font-size: 1.4rem;
    font-weight: 600;
    color: #e5c872;
    margin-bottom: 16px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.intro .center-text p:last-child {
    margin-top: 16px;
    color: #4a5568;
}

.intro li {
    height: 100%;
    position: relative;
    z-index: 2;
}

.intro article {
    display: flex;
    flex-direction: column;
    gap: 12px;
    height: 100%;
    transition: transform 0.3s ease;
}

.intro article h3 {
    position: relative;
    margin-top: 32px;
    margin-bottom: 16px;
}

.intro article h3::before {
    content: "\01f431";
    display: inline;
    filter: contrast(0%) sepia(100%) hue-rotate(340deg);
    opacity: 0.12;
    position: absolute;
    z-index: -1;
    width: 100%;
    text-align: center;
    font-size: 84px;
    top: -36px;
}

.intro article h3 span {
    display: block;
    font-size: 1.1rem;
    text-align: center;
    color: #6d000e;
    font-family: "Yomogi", cursive;
    font-weight: 400;
    font-style: normal;
    line-height: 1.4;
}

.intro article .content {
    background: linear-gradient(135deg, #fff2dd 0%, #ffebc7 100%);
    border: solid 3px #e5c872;
    border-radius: 16px;
    padding: 20px 16px;
    height: 100%;
    font-size: 0.85rem;
    line-height: 1.6;
    color: #4a5568;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.intro article:hover .content {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

.neko-showkai .section-title {
    margin-bottom: 80px;
    position: relative;
    z-index: 2;
}

.neko-showkai article {
    position: relative;
    height: 200px;
    padding: 48px 24px 32px;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 20px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(229, 200, 114, 0.2);
    display: flex;
    flex-direction: column;
    z-index: 2;
}

.neko-showkai article img {
    height: 100px;
    position: absolute;
    z-index: 0;
    top: 16px;
    left: 16px;
    opacity: 0.6;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.1));
}

.neko-showkai article h3 {
    font-family: "Yomogi", cursive;
    font-weight: 400;
    font-style: normal;
    font-size: 1.4rem;
    padding: 0;
    margin: 0 0 16px 92px;
    border-bottom: solid 2px #e5c872;
    color: #2d3748;
    z-index: 1;
    position: relative;
    padding-bottom: 8px;
    flex-shrink: 0;
}

.neko-showkai article .content {
    font-size: 0.95rem;
    margin-left: 108px;
    color: #4a5568;
    line-height: 1.7;
    z-index: 1;
    position: relative;
    font-weight: 500;
    flex: 1;
    display: flex;
    align-items: center;
}

.neko-showkai article:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
    border-color: rgba(229, 200, 114, 0.4);
}

.neko-showkai article:hover img {
    opacity: 0.8;
    transform: scale(1.05);
}

.voice-cat {
    padding: 48px 0;
}

.voice-cat .section-title {
    margin-bottom: 64px;
    position: relative;
    z-index: 2;
}

.voice-cat ul {
    display: flex;
    flex-direction: column;
    gap: 48px;
    max-width: 800px;
    margin: 0 auto;
}

.voice-cat li {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 0 24px;
}

.voice-cat li:nth-child(even) {
    flex-direction: row-reverse;
}

.voice-cat li:nth-child(even) .balloon:before {
    left: auto;
    right: -14px;
    top: 20px;
    border-right: none;
    border-left: 14px solid #e8f4fd;
    border-top: 14px solid transparent;
    border-bottom: 14px solid transparent;
}

.voice-cat li:nth-child(even) .balloon:after {
    left: auto;
    right: -17px;
    top: 18px;
    border-right: none;
    border-left: 16px solid rgba(229, 200, 114, 0.3);
    border-top: 16px solid transparent;
    border-bottom: 16px solid transparent;
}

.voice-cat h3 {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0;
    margin: 0;
    font-family: "Yomogi", cursive;
    font-weight: 400;
    font-style: normal;
    font-size: 0.9rem;
    color: #2d3748;
    min-width: 80px;
    flex-shrink: 0;
}

.voice-cat h3 img {
    border-radius: 50%;
    width: 64px;
    height: 64px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease;
    margin-bottom: 8px;
    border: 3px solid #fff;
}

.voice-cat h3 img:hover {
    transform: scale(1.1) rotate(5deg);
}

.voice-cat h3 span {
    font-weight: 500;
    text-align: center;
    color: #4a5568;
}

.balloon {
    position: relative;
    margin: 0;
    padding: 24px 28px;
    max-width: 600px;
    color: #2d3748;
    font-size: 0.95rem;
    line-height: 1.8;
    background: linear-gradient(135deg, #e8f4fd 0%, #f0f8ff 100%);
    border-radius: 20px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 2px solid rgba(229, 200, 114, 0.3);
    flex: 1;
}

.balloon:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
    transform: translateY(-4px);
    border-color: rgba(229, 200, 114, 0.5);
}

.balloon:before {
    content: "";
    position: absolute;
    top: 20px;
    left: -14px;
    width: 0;
    height: 0;
    border-top: 14px solid transparent;
    border-bottom: 14px solid transparent;
    border-right: 14px solid #e8f4fd;
    z-index: 2;
}

.balloon:after {
    content: "";
    position: absolute;
    top: 18px;
    left: -17px;
    width: 0;
    height: 0;
    border-top: 16px solid transparent;
    border-bottom: 16px solid transparent;
    border-right: 16px solid rgba(229, 200, 114, 0.3);
    z-index: 1;
}

.balloon p {
    margin: 12px 0;
    padding: 0;
}

.balloon p:first-child {
    margin-top: 0;
}

.balloon p:last-child {
    margin-bottom: 0;
}

.balloon p:empty {
    height: 0.5rem;
}

.scroll-animation[data-pattern="0"] {
    opacity: 0;
    transition: all 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-animation[data-pattern="0"][data-in="1"] {
    opacity: 1;
}

.scroll-animation[data-pattern="1"] {
    opacity: 0;
    transition: all 1.2s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateY(60px) translateX(40px);
}

.scroll-animation[data-pattern="1"][data-in="1"] {
    opacity: 1;
    transform: translateY(0) translateX(0);
}

.scroll-animation[data-pattern="2"] {
    opacity: 0;
    transition: all 1.2s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateY(60px);
}

.scroll-animation[data-pattern="2"][data-in="1"] {
    opacity: 1;
    transform: translateY(0);
}

.scroll-animation[data-pattern="3"] {
    opacity: 0;
    transition: all 1.2s cubic-bezier(0.4, 0, 0.2, 1);
    transform: scale(0.8) translateY(40px);
    transform-origin: center center;
}

.scroll-animation[data-pattern="3"][data-in="1"] {
    opacity: 1;
    transform: scale(1) translateY(0);
}

/* Additional z-index for section elements */
.features-section .section-title,
.tech-features .section-title {
    position: relative;
    z-index: 2;
}

.features-section .feature-item,
.tech-features .feature-item {
    position: relative;
    z-index: 2;
    background: linear-gradient(135deg, #ffffff 0%, #f8fbff 100%);
    border-radius: 20px;
    padding: 0;
    margin: 48px 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    border: 2px solid rgba(135, 206, 235, 0.2);
    transition: all 0.3s ease;
    overflow: hidden;
}

.features-section .feature-item:hover,
.tech-features .feature-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
    border-color: rgba(135, 206, 235, 0.4);
}

.features-section .feature-item .header-cat,
.tech-features .feature-item .header-cat {
    position: relative;
    z-index: 2;
    margin: 0;
    padding: 20px 24px 16px;
    background: linear-gradient(135deg, rgba(113, 128, 150, 0.12) 0%, rgba(113, 128, 150, 0.08) 100%);
    border-bottom: 2px solid #718096;
    border-radius: 20px 20px 0 0;
}

.features-section .feature-item .left-text,
.features-section .feature-item .center-text,
.tech-features .feature-item .left-text,
.tech-features .feature-item .center-text {
    position: relative;
    z-index: 2;
    padding: 24px 24px 32px;
    margin: 0;
}

.features-section .feature-item .captures {
    margin: 0;
    padding: 0 24px 32px;
}

/* tech-featuresの特別なアクセントカラー */
.tech-features .feature-item:nth-child(2) .header-cat {
    background: linear-gradient(135deg, rgba(113, 128, 150, 0.12) 0%, rgba(113, 128, 150, 0.08) 100%);
    border-bottom-color: #718096;
}

.tech-features .feature-item:nth-child(3) .header-cat {
    background: linear-gradient(135deg, rgba(160, 174, 192, 0.12) 0%, rgba(160, 174, 192, 0.08) 100%);
    border-bottom-color: #a0aec0;
}

/* レスポンシブ対応: より滑らかな変化のために複数のブレークポイントを設定 */

@media screen and (max-width: 800px) {
    .column3 {
        display: flex;
        flex-direction: column;
        gap: 32px;
        padding: 0 16px;
    }

    .column3 li article {
        height: auto;
    }

    .column3 li article .content {
        height: auto;
        padding: 20px 16px;
        font-size: 0.9rem;
    }

    .intro {
        padding: 32px 0 48px;
    }

    .intro-title {
        font-size: 2rem;
        margin-bottom: 40px;
    }

    .intro .center-text {
        margin: 0 16px 32px;
        padding: 24px 20px;
    }

    .intro .center-text p:first-child {
        font-size: 1.2rem;
    }

    .intro .center-text p {
        font-size: 1rem;
    }

    .intro article h3 span {
        font-size: 1.1rem;
    }

    .intro article:hover .content {
        transform: translateY(-2px);
    }

    .captures {
        padding: 0 16px;
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .captures li img {
        max-height: 300px;
    }

    .store-link {
        grid-template-columns: 1fr;
        gap: 24px;
        padding: 32px 16px;
    }

    .store-link .apple {
        height: auto;
        min-height: 80px;
    }

    .store-link .apple img {
        height: 80px;
        width: 220px;
        object-fit: contain;
        max-width: 280px;
    }

    .store-link .google img {
        height: 80px;
        width: 220px;
        object-fit: contain;
        max-width: 280px;
    }    .site-header .cats {
        bottom: 8%;
    }


    .neko-showkai article {
        padding: 16px;
    }

    .neko-showkai article img {
        height: 80px;
        top: 8px;
    }

    .neko-showkai article h3 {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 1.5rem;
        margin: 0 0 48px;
    }

    .voice-cat ul {
        gap: 32px;
    }

    .voice-cat li {
        flex-direction: column !important;
        align-items: center;
        gap: 16px;
        padding: 0 16px;
    }

    .voice-cat li .balloon {
        max-width: 100%;
    }

    .voice-cat li .balloon:before {
        top: -14px !important;
        left: 50% !important;
        right: auto !important;
        transform: translateX(-50%);
        border-right: none !important;
        border-left: 14px solid transparent !important;
        border-right: 14px solid transparent !important;
        border-bottom: 14px solid #e8f4fd !important;
        border-top: none !important;
    }

    .voice-cat li .balloon:after {
        top: -16px !important;
        left: 50% !important;
        right: auto !important;
        transform: translateX(-50%);
        border-right: none !important;
        border-left: 16px solid transparent !important;
        border-right: 16px solid transparent !important;
        border-bottom: 16px solid rgba(229, 200, 114, 0.3) !important;
        border-top: none !important;
    }

    .voice-cat h3 img {
        width: 56px;
        height: 56px;
    }

    .features-section .feature-item,
    .tech-features .feature-item {
        margin: 32px 8px;
        padding: 0;
    }

    .features-section .feature-item .header-cat {
        padding: 16px 16px 12px;
    }

    .features-section .feature-item .left-text,
    .features-section .feature-item .center-text {
        padding: 20px 16px 24px;
    }

    .tech-features .feature-item .header-cat {
        padding: 16px 16px 12px;
    }

    .tech-features .feature-item .left-text,
    .tech-features .feature-item .center-text {
        padding: 20px 16px 24px;
    }

    .features-section .feature-item .captures {
        padding: 0 16px 24px;
    }

    .header-cat {
        margin: 24px 8px 16px;
    }
}