/* ========================================
   CONCEPT PAGES
======================================== */

/* ========================================
   1. Title Page
======================================== */
.concept-title-page {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--color-white);
    height: 100vh;
    box-sizing: border-box;
    padding: calc(var(--header-height) + 40px) var(--spacing-lg) var(--spacing-xl);
}

.concept-title-page__inner {
    text-align: center;
}

.concept-title-page__heading {
    line-height: 1.2;
}

.concept-title-page__main {
    display: block;
    font-family: var(--font-en);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.1em;
}

.concept-title-page__sub {
    display: block;
    font-family: var(--font-en);
    font-size: 2.5rem;
    color: var(--color-primary);
    font-weight: 400;
    margin-top: var(--spacing-md);
}

/* ========================================
   2. Illustration Page
======================================== */
.concept-illustration-page {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--color-white);
    height: 100vh;
    box-sizing: border-box;
    padding: calc(var(--header-height) + 40px) var(--spacing-lg) var(--spacing-xl);
}

.concept-illustration-page__inner {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.concept__illustration {
    width: 100%;
    max-width: 900px;
}

.concept__illustration-svg {
    width: 100%;
    height: auto;
}

/* ========================================
   3. Text Page
======================================== */
.concept-text-page {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: calc(var(--header-height) + 40px) var(--spacing-lg) var(--spacing-xl);
    background-color: var(--color-white);
    height: 100vh;
    box-sizing: border-box;
}

.concept-text-page__inner {
    max-width: 100%;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.concept__text-section {
    text-align: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xxl);
}

.concept__text-title {
    font-size: 2rem;
    font-weight: 500;
    color: #393939;
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.concept__text-body {
    font-size: 1.125rem;
    line-height: 2;
    margin-bottom: var(--spacing-xxl);
    color: #393939;
}

.concept__text-subtitle {
    font-size: 1.125rem;
    font-weight: 500;
    color: #393939;
    margin-bottom: var(--spacing-sm);
}

/* Text Illustration */
.concept__text-illustration {
    width: 100%;
    max-width: 350px;
    margin: var(--spacing-xl) auto;
    display: none;
    /* PCでは非表示（モバイルのみ表示） */
    justify-content: center;
    align-items: center;
}

.concept__text-illustration-svg {
    width: 100%;
    height: auto;
}

/* ========================================
   MOBILE - Unified Layout
======================================== */
@media (max-width: 768px) {

    /* タイトルとイラストページを非表示 */
    .concept-illustration-page {
        display: none !important;
    }

    /* タイトルページを統合レイアウトに変更 */
    .concept-title-page {
        height: auto;
        min-height: auto;
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .concept-title-page__main {
        font-size: 1.75rem;
        line-height: 1.3;
        margin-bottom: var(--spacing-xs);
    }

    .concept-title-page__sub {
        font-size: 1.25rem;
        margin-top: var(--spacing-xs);
    }

    /* テキストページ調整 */
    .concept-text-page {
        height: auto;
        min-height: auto;
        padding: 0 var(--spacing-md) var(--spacing-lg);
    }

    .concept-text-page__inner {
        height: auto;
    }

    .concept__text-section {
        max-width: 100%;
        padding: 0;
    }

    .concept__text-title {
        font-size: 1.125rem;
        margin-bottom: var(--spacing-md);
    }

    .concept__text-body {
        font-size: 0.8125rem;
        line-height: 1.9;
        margin-bottom: var(--spacing-lg);
    }

    .concept__text-illustration {
        max-width: 280px;
        margin: var(--spacing-lg) auto;
        display: flex;
        /* モバイルでは表示 */
    }
}

/* Responsive - Stack vertically on tablet/mobile */
@media (max-width: 1023px) {
    .concept-illustration-page__inner {
        overflow-y: auto;
    }

    .concept__illustration {
        max-width: 400px;
    }

    .concept-text-page__inner {
        overflow-y: auto;
    }

    .concept__text-section {
        text-align: center;
    }
}