/* --- Ideaページ専用のスタイル --- */
.idea-main {
    padding-top: 140px;
    padding-bottom: 100px;
}

.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    text-align: left;
}

/* .main-title and .subtitle are now in base.css for consistency */

.philosophy-container {
    display: flex;
    flex-direction: column;
    gap: 100px;
    margin-top: 60px;
    max-width: 1200px;
    counter-reset: philosophy-counter;
}

.philosophy-item {
    text-align: left;
}

.philosophy-item:nth-child(1) {
    --item-color: rgba(74, 144, 226, 0.15);
    --number-color: #4A90E2;
}

.philosophy-item:nth-child(2) {
    --item-color: rgba(126, 211, 33, 0.15);
    --number-color: #7ED321;
}

.philosophy-item:nth-child(3) {
    --item-color: rgba(189, 16, 224, 0.15);
    --number-color: #BD10E0;
}

.philosophy-title {
    font-size: 2.2em;
    margin-bottom: 30px;
    padding-bottom: 20px;
    color: #1a1a1a;
    font-weight: 700;
    letter-spacing: 1px;
    position: relative;
    display: block;
    border-bottom: 4px solid var(--number-color);
}

.philosophy-title::before {
    content: '0' counter(philosophy-counter);
    counter-increment: philosophy-counter;
    font-size: 2.2em;
    font-weight: 900;
    color: var(--number-color);
    margin-right: 15px;
    opacity: 0.8;
}

.philosophy-item:nth-child(1) .philosophy-title {
    counter-reset: philosophy-counter 0;
}

.philosophy-item:nth-child(2) .philosophy-title {
    counter-reset: philosophy-counter 1;
}

.philosophy-item:nth-child(3) .philosophy-title {
    counter-reset: philosophy-counter 2;
}

.philosophy-subtitle {
    font-size: 1.5em;
    font-weight: 600;
    color: #2a2a2a;
    margin-top: 40px;
    margin-bottom: 20px;
    padding-left: 20px;
    border-left: 5px solid var(--number-color);
}

.philosophy-subtitle:first-of-type {
    margin-top: 0;
}

.philosophy-subtitle + .philosophy-text {
    padding-left: 40px;
}

.philosophy-text {
    font-size: 1.2em;
    line-height: 2;
    color: #555;
    font-weight: 400;
    margin-bottom: 25px;
}

.philosophy-text strong {
    font-weight: 700;
    color: #333;
}

.philosophy-text .highlight {
    color: #666;
    font-weight: 500;
    background: linear-gradient(transparent 60%, rgba(74, 144, 226, 0.15) 60%);
    padding: 0 4px;
}

.philosophy-item:nth-child(1) .philosophy-text .highlight {
    background: linear-gradient(transparent 60%, rgba(74, 144, 226, 0.15) 60%);
}

.philosophy-item:nth-child(2) .philosophy-text .highlight {
    background: linear-gradient(transparent 60%, rgba(126, 211, 33, 0.15) 60%);
}

.philosophy-item:nth-child(3) .philosophy-text .highlight {
    background: linear-gradient(transparent 60%, rgba(189, 16, 224, 0.15) 60%);
}

@media (max-width: 768px) {
    .idea-main {
        padding-top: 100px;
        padding-bottom: 60px;
    }

    .content-wrapper {
        padding: 0 20px;
    }

    .main-title {
        font-size: 2.5em;
        letter-spacing: 1px;
    }

    .subtitle {
        font-size: 1.1em;
        margin-bottom: 50px;
    }

    .philosophy-container {
        gap: 60px;
        margin-top: 50px;
    }

    .philosophy-title {
        font-size: 2em;
        padding-bottom: 15px;
        margin-bottom: 20px;
    }

    .philosophy-subtitle {
        font-size: 1.4em;
        margin-top: 30px;
        margin-bottom: 15px;
        padding-left: 15px;
        border-left-width: 4px;
    }

    .philosophy-subtitle + .philosophy-text {
        padding-left: 25px;
    }

    .philosophy-text {
        font-size: 1.15em;
    }
}

@media (max-width: 480px) {
    .idea-main {
        padding-top: 90px;
        padding-bottom: 50px;
    }

    .content-wrapper {
        padding: 0 15px;
    }

    .main-title {
        font-size: 2em;
    }

    .subtitle {
        font-size: 1em;
        margin-bottom: 40px;
    }

    .philosophy-container {
        gap: 50px;
        margin-top: 40px;
    }

    .philosophy-title {
        font-size: 1.7em;
        padding-bottom: 12px;
        margin-bottom: 15px;
    }

    .philosophy-title::before {
        font-size: 1.8em;
        margin-right: 10px;
    }

    .philosophy-subtitle {
        font-size: 1.3em;
        margin-top: 25px;
        margin-bottom: 12px;
        padding-left: 12px;
        border-left-width: 3px;
    }

    .philosophy-subtitle + .philosophy-text {
        padding-left: 20px;
    }

    .philosophy-text {
        font-size: 1.05em;
        line-height: 1.8;
    }
}
/* geometric-background は削除されました（base.css の固定背景を使用） */