.container {
    max-width: 100%;
    overflow: hidden;
    margin: 0 auto;
    padding: 50px;
    position: relative;
    background: linear-gradient(135deg, #1dd1a1 0%, #55b3d9 100%);
    border-radius: 2em;
    margin: 1em;
}

.bg-circles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    max-width: 100%;
    overflow: hidden;
}

.bg-circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
}

.bg-circle.large {
    width: 300px;
    height: 300px;
    top: -50px;
    left: -100px;
}

.bg-circle.medium {
    width: 200px;
    height: 200px;
    top: 100px;
    right: -50px;
}

.bg-circle.small {
    width: 150px;
    height: 150px;
    bottom: 50px;
    left: 50px;
}

.main-content {
    position: relative;
    z-index: 2;
}

.header-badge {
    background: linear-gradient(135deg, #8b5cf6 0%, #a855f7 100%);
    color: white;
    padding: 12px 24px;
    font-size: 36px;
    font-weight: bold;
    display: inline-block;
    margin-bottom: 30px;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
    width: 100%;
    text-align: center;
    box-sizing: border-box;
}

.header-main-title {
    color: white;
    font-size: 48px;
    font-weight: bold;
    line-height: 1.2;
    margin-bottom: 40px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.subtitle {
    background: white;
    color: #333;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 40px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.subtitle p {
    font-size: 16px;
    line-height: 1.8;
}

.top-section {
    display: flex;
    align-items: center;
    gap: 40px;
    margin-bottom: 50px;
    margin-left: auto;
    margin-right: auto;
    width: 850px;
    max-width: 100%;
}

.left-content {
    flex: 1;
    box-sizing: border-box;
}

.right-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    box-sizing: border-box;
}

.language-flags {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px;
    border-radius: 15px;
}

.language-badge {
    color: white;
    padding: 0px 15px;
    border-radius: 50px;
    font-weight: bold;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    height: 3rem;
}

.language-badge.highlight {
    background: #a855f7;
    position: absolute;
    left: 10px;
    top: 20px;
}
.language-badge p {
    line-height: 3rem;
    color: #ffffff;
}
.lang-strong {
    font-size: 20px;
}
.flag-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-bottom: 10px;
}

.flag-item {
    width: 40px;
    height: 30px;
    background: #ccc;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.phone {
    max-width: 300px;
    position: relative;
}

.phone-header {
    height: 20px;
    background: #ddd;
    border-radius: 10px;
    margin-bottom: 15px;
}

.chat-bubble {
    background: #4ade80;
    color: white;
    padding: 10px 15px;
    border-radius: 18px;
    margin-bottom: 10px;
    font-size: 12px;
    max-width: 80%;
    margin-left: auto;
}

.chat-bubble.received {
    background: white;
    color: #333;
    margin-left: 0;
    margin-right: auto;
    border: 1px solid #ddd;
}

.brand-logo {
    width: 300px;
    max-width: 100%;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.feature-card {
    padding: 40px 20px 20px 20px;
    position: relative;
    border: 1.5px solid #ffffff;
}

.feature-badge {
    background: #ffffff;
    color: #55b3d9;
    padding: 8px 16px;
    font-weight: bold;
    position: absolute;
    top: -8%;
    border-radius: 5px;
    display: inline-block;
    overflow: hidden;
}
.feature-badge span {
    letter-spacing: 0.25em;
    margin-right: -0.25em;
    display: inline-block;
}
.bottom-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
}

.action-btn {
    background: rgba(0, 0, 0, 0.6);
    color: white;
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    font-size: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.action-btn:hover {
    background: rgba(0, 0, 0, 0.8);
    transform: translateY(-2px);
}

.action-btn.primary {
}

.action-btn.secondary {
}

/** ここがすごい **/
.great-section {
    background: white;
    margin: 60px auto;
    padding: 60px 40px;
    border-radius: 20px;
    max-width: 1200px;
    position: relative;
}
.brand-header {
    display: flex;
    gap: 30px;
    align-items: center;
    justify-content: center;
    margin-bottom: 40px;
}
.highlight-badge {
    background: linear-gradient(135deg, #8b5cf6 0%, #a855f7 100%);
    color: white;
    padding: 12px 24px;
    font-size: 18px;
    font-weight: bold;
    display: inline-block;
    margin-bottom: 30px;
    position: relative;
}

.highlight-badge::after {
    content: "";
    position: absolute;
    right: -10px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 15px solid #a855f7;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
}
.ojtalk_ttl {
    max-width: 300px;
}

.content-row {
    display: flex;
    align-items: center;
    gap: 40px;
    margin-top: 40px;
}

.text-content {
    flex: 1;
}

.main-text {
    font-size: 18px;
    line-height: 1.6;
    margin-bottom: 10px;
}

.highlight-text {
    font-size: 20px;
    color: #e11d48;
    font-weight: bold;
    line-height: 1.6;
    margin-bottom: 20px;
}

.description-text {
    line-height: 1.8;
    margin-bottom: 0;
}

.image-content {
    flex: 0 0 300px;
    width: 100%;
    height: 200px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.image-content img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
}

/** 特長4つ **/
.feature-section {
    background-color: #b3eeee;
    padding: 80px 40px;
    margin: 0;
    position: relative;
    overflow: hidden;
}

.feature-container {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
}

.feature-cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    margin-bottom: 0;
}

.feature-item {
    background: white;
    border-radius: 20px;
    padding: 50px 90px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 2;
}

.feature-item-header {
    color: #e44444;
    font-size: 24px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 25px;
}

.feature-item-content {
    text-align: center;
}

.feature-illustration {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.feature-description {
    line-height: 1.6;
    margin: 0;
}

.center-badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 3;
    text-align: center;
}

.center-badge-content {
    background-color: #dc2626;
    color: white;
    padding: 15px 25px;
    border-radius: 25px;
    display: inline-block;
    position: relative;
    z-index: 1;
    top: 20px;
}
.center-badge-content::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 100%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border: 10px solid transparent;
    border-top: 10px solid #dc2626;
}
.center-badge-number {
    font-size: 24px;
    font-weight: bold;
    display: inline;
    color: #fff700;
}

.center-badge-text {
    font-weight: bold;
    display: inline;
    margin-left: 5px;
}

.center-badge-main {
    background-color: #00c7c7;
    color: white;
    padding: 50px 40px 40px 40px;
    border-radius: 15px;
    font-size: 24px;
    font-weight: bold;
    line-height: 2;
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
    white-space: nowrap;
}

/** 選ばれる理由 **/
.reason-section {
    max-width: 100%;
    margin: 0 auto;
}

.reason-header {
    width: 1200px;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 50px;
}

.reason-title-oval {
    background-color: #b3eeee;
    border-radius: 50% / 0 0 100% 100%;
    padding: 20px 20px 60px;
    margin-bottom: 20px;
    width: 100%;
    display: flex;
    gap: 30px;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    box-sizing: border-box;
}

.reason-title-image {
    max-width: 250px;
}
.reason-subtitle {
    font-size: 36px;
    font-weight: bold;
}

.reason-grid {
    width: 1400px;
    max-width: 95%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 20px;
    margin-left: auto;
    margin-right: auto;
}

.reason-grid-bottom {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    width: 1400px;
    max-width: 95%;
    margin-left: auto;
    margin-right: auto;
}

.reason-card {
    border-radius: 35px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
}

.reason-number {
    position: absolute;
    top: -8px;
    left: -8px;
    background: #00c7c7;
    color: white;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 24px;
}
.reason-card-top {
    background-color: #fbfff0;
    padding: 30px 20px 0 20px;
}
.reason-card-title {
    font-size: 24px;
    font-weight: bold;
    color: #00c7c7;
    margin-bottom: 20px;
}
.reason-icon {
    width: 70%;
    margin: 0 auto;
}
.reason-description-text {
    padding: 30px 20px 20px 20px;
    line-height: 1.6;
    text-align: left;
}
.talk-display {
    width: 1200px;
    max-width: 95%;
    margin-left: auto;
    margin-right: auto;
    padding: 80px 40px;
    box-sizing: border-box;
    position: relative;
}
.talk-display-ttl {
    position: relative;
    background-color: #333;
    font-size: 32px;
    color: #ffffff;
    padding: 0.5em;
    display: inline-block;
    top: 40px;
    left: 30px;
    clip-path: polygon(30px 0, calc(100% - 30px) 0, 100% 40px, calc(100% - 30px) 80px, 30px 80px, 0 40px);
    padding-left: calc(0.5em + 30px);
    padding-right: calc(0.5em + 30px);
}

.talk-display-container {
    padding: 60px 40px;
    background-color: #e4e4e4;
    box-sizing: border-box;
    width: 100%;
}
.pc-none {
    display: none;
}

/** 活用事例 **/
.cases-section {
    margin: 80px auto;
    padding: 60px 40px;
    max-width: 1300px;
    box-sizing: border-box;
}
.cases-container {
    width: 100%;
    background-color: #d6ecea;
    padding: 60px 40px;
    box-sizing: border-box;
    position: relative;
}
.cases-header {
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    width: 70%;
}
.cases-top {
    padding: 1em;
    background: linear-gradient(135deg, #8b5cf6 0%, #a855f7 100%);
    color: white;
    font-size: 24px;
    font-weight: bold;
    text-align: center;
}
.cases-item {
    margin-bottom: 80px;
}
.cases-item:last-child {
    margin-bottom: 0;
}
.cases-title {
    max-width: 65%;
    padding: 0.5em;
    margin: 20px auto 50px;
    background-color: #ffffff;
    font-size: 32px;
    font-weight: bold;
}
.case-number {
    position: relative;
    margin-right: 1em;
}
.case-number::after {
    position: absolute;
    content: "";
    width: 5px;
    height: 100%;
    top: 50%;
    right: -25px;
    transform: translateY(-50%);
    background: linear-gradient(165deg, #8b5cf6 0%, #a855f7 100%);
}
.problem-section {
    position: relative;
    background-color: #ffffff;
    padding: 60px 40px 30px;
}
.problem-badge {
    position: absolute;
    top: -40px;
    background-color: #00c7c7;
    color: #ffffff;
    font-weight: bold;
    padding: 1em 1.5em;
    font-size: 24px;
    border-radius: 50%;
}
.problem-content {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    justify-content: flex-start;
}
.problem-character {
    max-width: 100px;
}
.problem-list {
    list-style: none;
}
.problem-list li {
    line-height: 1.8;
    font-weight: bold;
    font-size: 24px;
}
.arrow {
    position: absolute;
    bottom: -20px;
    left: 90px;
}
.arrow .material-symbols-outlined {
    font-size: 48px;
    font-weight: bold;
    color: #ec7469;
}
.solution-section {
    position: relative;
    background-color: #ffffff;
    padding: 60px 40px 30px;
    margin-top: 70px;
}
.solution-badge {
    position: absolute;
    top: -40px;
    background-color: #ffff00;
    color: #ec7469;
    font-weight: bold;
    padding: 1em 1.5em;
    font-size: 24px;
    border-radius: 50%;
}
.solution-content {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    justify-content: flex-start;
}
.solution-character {
    max-width: 140px;
}
.solution-right {
    width: 100%;
}
.solution-title {
    text-align: center;
    font-size: 24px;
    margin-bottom: 20px;
}
.solution-subtitle {
    text-align: center;
}
.solution-grid {
    display: grid;
    gap: 2em;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    margin-top: 30px;
}
.solution-card h4 {
    color: #42200a;
    text-align: center;
    font-size: 20px;
    margin-bottom: 10px;
}
.solution-points {
    margin-top: 30px;
}
.solution-points li {
    line-height: 1.8;
    font-size: 20px;
    font-weight: bold;
}

/** メッセージ **/
.message-section {
    text-align: center;
    width: 1200px;
    max-width: 95%;
    margin: 80px auto;
}

.message-section p {
    font-size: 24px;
    line-height: 1.8;
}

/** コンタクト **/
.contact-section {
    background-color: #00c7c7;
    padding: 80px 40px;
    color: white;
    position: relative;
    overflow: hidden;
}

.contact-container {
    width: 1400px;
    max-width: 95%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 60px;
}

.contact-left {
    flex: 1;
}

.contact-title {
    font-size: 72px;
    font-weight: bold;
    letter-spacing: 4px;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    opacity: 0.8;
}

.contact-subtitle {
    font-size: 24px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: bold;
}

.contact-subtitle::before,
.contact-subtitle::after {
    content: "•";
    font-size: 24px;
}

.contact-description {
    color: #ffffff;
}

.contact-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 30px;
}

.ojtalk-brand {
    display: flex;
    align-items: center;
    gap: 20px;
}

.ojtalk-logo {
    max-width: 180px;
}

.ojtalk-tagline {
    font-size: 36px;
    font-weight: bold;
}

.contact-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.contact-btn {
    background: white;
    color: #00c7c7;
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.contact-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.contact-btn::after {
    content: "→";
    font-size: 18px;
    transition: transform 0.3s ease;
}

.contact-btn:hover::after {
    transform: translateX(3px);
}

/** フッター **/
.footer-container {
    max-width: 600px;
    margin: 100px auto;
}

.company-logo {
    max-width: 300px;
    margin: 0 auto;
}

.company-name {
    font-size: 36px;
    margin: 30px 0 10px 0;
    text-align: center;
    font-weight: bold;
}

.company-info {
    text-align: center;
}
.copy {
    text-align: center;
}

@media (max-width: 768px) {
    /* === トップセクション（ファーストビュー） === */
    .container {
        padding: 40px 20px;
    }
    .top-section {
        flex-direction: column;
        width: 100%;
        gap: 20px;
    }
    .left-content,
    .right-content {
        width: 80%;
    }
    .header-main-title {
        font-size: 32px;
        text-align: center;
    }

    .subtitle {
        padding: 15px;
    }

    .right-content {
        flex-direction: column;
        gap: 10px;
    }

    .brand-logo {
        width: 200px;
    }

    /* === 特長アイコン4つ === */

    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .feature-card {
        padding: 20px;
    }

    /* === 「ここがすごい」セクション === */
    .content-row {
        flex-direction: column;
        gap: 20px;
    }

    .image-content {
        height: auto;
    }

    /* === 特長ブロック（白カード4つ） === */
    .feature-section {
        padding: 40px;
    }
    .feature-container {
        position: static;
    }
    .center-badge {
        position: static;
        transform: none;
    }
    .feature-cards-grid {
        grid-template-columns: 1fr;
        padding: 0;
        margin-top: 20px;
    }
    .feature-item {
        padding: 20px;
    }
    .illustration-placeholder {
        width: 60%;
        margin: 0 auto;
    }

    /* === 選ばれる理由（カード8枚） === */
    .reason-grid,
    .reason-grid-bottom {
        grid-template-columns: repeat(2, 1fr);
    }

    /* === OJトーク画面表示エリア === */
    .talk-display-container {
        padding: 20px;
    }

    .talk-display-ttl {
        font-size: 24px;
        left: 0;
        height: 50px;
        line-height: 50px;
        clip-path: polygon(20px 0, calc(100% - 20px) 0, 100% 50%, calc(100% - 20px) 100%, 20px 100%, 0 50%);
        padding-left: calc(0.5em + 20px);
        padding-right: calc(0.5em + 20px);
    }
    /* === 活用事例タイトル（cases） === */
    .cases-section {
        margin-top: 0;
    }
    .cases-header {
        width: 90%;
    }

    .cases-title {
        font-size: 24px;
    }
    .problem-content,
    .solution-content {
        flex-direction: column;
    }
    .problem-character,
    .solution-character {
        display: none;
    }
    .solution-grid {
        grid-template-columns: 1fr;
    }
    .arrow {
        bottom: -40px;
        left: 50%;
        transform: translateX(-50%);
    }
    /* === メッセージセクション === */
    .message-section p {
        font-size: 18px;
    }

    /* === コンタクト（お問い合わせ） === */
    .contact-container {
        flex-direction: column;
        gap: 40px;
    }

    .contact-right {
        align-items: center;
    }
    .contact-title {
        font-size: 48px;
    }

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

    .ojtalk-tagline {
        font-size: 24px;
        text-align: center;
    }

    .footer-container {
        margin: 60px auto;
    }

    .company-name {
        font-size: 24px;
    }

    .contact-btn {
        font-size: 14px;
        padding: 12px 20px;
    }

    .action-btn {
        font-size: 18px;
        padding: 12px 20px;
    }
}

@media (max-width: 480px) {
    /* === トップセクション（ファーストビュー） === */
    .left-content,
    .right-content {
        width: 100%;
    }
    .language-flags {
        padding: 0;
    }
    .header-main-title {
        margin-bottom: 30px;
    }
    .subtitle {
        margin-bottom: 0;
    }
    .feature-card {
        padding: 35px 20px 20px 20px;
    }
    .bottom-actions {
        flex-direction: column;
    }

    /* === 特長アイコン4つ（1カラム） === */
    .feature-grid {
        grid-template-columns: 1fr;
        gap: 35px;
    }
    .feature-item-header {
        font-size: 21px;
        margin-bottom: 10px;
    }
    .feature-illustration {
        margin-bottom: 10px;
    }
    .feature-cards-grid {
        gap: 20px;
    }
    /* === 理由カード（1カラム） === */
    .reason-title-oval {
        gap: 10px;
    }
    .reason-subtitle {
        font-size: 28px;
    }
    .reason-title-image {
        max-width: 120px;
    }
    .reason-grid,
    .reason-grid-bottom {
        grid-template-columns: 1fr;
    }
    .reason-icon {
        width: 50%;
    }
    .talk-display {
        padding: 30px 15px;
    }
    .talk-display-container {
        padding: 50px 20px;
    }
    .pc-none {
        display: block;
    }
    .sp-none {
        display: none;
    }
    .talk-display-ttl {
        font-size: 20px;
        top: 25px;
        height: 40px;
        line-height: 40px;
        clip-path: polygon(15px 0, calc(100% - 15px) 0, 100% 50%, calc(100% - 15px) 100%, 15px 100%, 0 50%);
        padding-left: calc(0.5em + 15px);
        padding-right: calc(0.5em + 15px);
    }
    /* === ブランド見出しエリア（ここがすごい） === */
    .brand-header {
        flex-direction: column;
        gap: 10px;
    }

    .highlight-badge {
        font-size: 16px;
    }
    .highlight-badge::after {
        left: 50%;
        top: 100%;
        transform: translateX(-50%);
        width: 0;
        height: 0;
        border: 10px solid transparent;
        border-top: 10px solid #a855f7;
    }
    .center-badge-main {
        font-size: 18px;
        padding: 30px;
        white-space: normal;
    }

    .reason-card-title {
        font-size: 20px;
    }

    .cases-title {
        font-size: 20px;
        max-width: 100%;
    }
    .cases-section {
        padding: 60px 0 0;
    }
    .cases-container {
        padding: 60px 20px;
    }
    .case-number::after {
        right: -15px;
    }
    .problem-list li,
    .solution-points li {
        font-size: 18px;
    }
    .problem-badge,
    .solution-badge {
        font-size: 20px;
        left: 15px;
    }
    .problem-section,
    .solution-section {
        padding: 40px 25px;
    }

    .message-section p {
        font-size: 20px;
    }

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

    .ojtalk-logo {
        max-width: 140px;
    }

    .ojtalk-tagline {
        font-size: 20px;
    }
    .ojtalk-brand {
        gap: 10px;
    }
    .action-btn {
        justify-content: center;
        font-size: 16px;
    }
    .contact-section {
        padding: 50px 30px;
    }
    .contact-container {
        max-width: 100%;
    }
    .contact-buttons {
        flex-direction: column;
        width: 100%;
    }
    .contact-btn {
        font-size: 16px;
        justify-content: center;
    }
}