/* 
    【全体設定】
    Webページ全体の基本的なスタイルを定義します。
*/
* {
    box-sizing: border-box;
}

:root {
    /* カラーパレット（Light Theme） */
    --bg-color: #f9fbfd;
    /* 背景色：澄んだ空気を感じる非常に薄いブルーグレー */
    --text-main: #1c475e;
    /* メイン文字色：知的な印象のダークネイビー */
    --text-sub: #546e7a;
    /* サブ文字色：落ち着いたブルーグレー */
    --accent-gold: #b8860b;
    /* アクセント：知恵と光を表すダークゴールド */
    --accent-blue: #4facfe;
    /* アクセント：池や空の爽やかさを表すクリアブルー */
    --accent-green: #43e97b;
    /* アクセント：草原の生命力を表すフレッシュグリーン */

    /* ガラス風デザインの設定 */
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-border: rgba(255, 255, 255, 0.8);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Zen Kaku Gothic New', sans-serif;
    background-color: var(--bg-color);
    background-image: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    color: var(--text-main);
    line-height: 1.8;
    overflow-x: hidden;
    width: 100%;
}

/* 
    【背景アニメーション】
*/
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.6;
    animation: float 25s infinite ease-in-out;
    mix-blend-mode: multiply;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: #e0c3fc;
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: #8ec5fc;
    bottom: -10%;
    right: -10%;
    animation-delay: -5s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: #96e6a1;
    top: 30%;
    left: 30%;
    opacity: 0.4;
    animation-delay: -10s;
}

@keyframes float {
    0% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(30px, 50px) scale(1.1);
    }

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

/* 
    【ヘッダー】
*/
.header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 0;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(15px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.02);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo img {
    height: 40px;
    width: auto;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
    margin: 0;
    padding: 0;
}

.nav a {
    text-decoration: none;
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s;
}

.nav a:hover {
    color: var(--accent-blue);
}

.btn-nav {
    background: linear-gradient(120deg, var(--accent-blue) 0%, var(--accent-green) 100%);
    padding: 10px 24px;
    border-radius: 50px;
    color: white !important;
    border: none;
    box-shadow: 0 4px 15px rgba(79, 172, 254, 0.3);
    transition: transform 0.3s, box-shadow 0.3s !important;
}

.btn-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 172, 254, 0.4);
}

/* 
    【Heroセクション】
*/
.hero {
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
}

.main-copy {
    font-family: 'Zen Kaku Gothic New', sans-serif;
    font-size: 4rem;
    font-weight: 400;
    margin-bottom: 25px;
    letter-spacing: 0.05em;
    color: var(--text-main);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.sub-copy {
    font-size: 1.2rem;
    color: var(--text-sub);
    margin-bottom: 50px;
    font-weight: 400;
}

.btn-primary {
    display: inline-block;
    background: linear-gradient(to right, var(--accent-blue) 0%, var(--accent-green) 100%);
    color: white;
    padding: 18px 45px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    letter-spacing: 0.05em;
    box-shadow: 0 10px 30px rgba(67, 233, 123, 0.3);
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(67, 233, 123, 0.4);
    text-align: center;
}

/* 
    【共通セクション設定】
*/
section {
    padding: 80px 20px;
}

.problem {
    padding-top: 0;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.section-title {
    font-family: 'Cormorant Garamond', serif;
    font-size: 3rem;
    font-weight: 400;
    margin-bottom: 50px;
    color: var(--text-main);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 2px;
    background: var(--accent-gold);
    margin: 15px auto 0;
    opacity: 0.6;
}

.text-body {
    font-size: 1.15rem;
    color: var(--text-sub);
    line-height: 2.2;
}

/* 
    【Aboutセクション】
    ルディクレアとは
*/
.about {
    background: white;
    position: relative;
}

.about-content {
    margin-bottom: 60px;
}

/* ここが重要：PCでは横並びにする設定 */
.etymology-box {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 40px;
    margin: 50px 0;
    flex-wrap: nowrap;
    /* PCでは折り返さない */
}

/* カードスタイルの適用 */
.etymology-item {
    background: var(--glass-bg);
    border: 1px solid white;
    padding: 40px 30px;
    border-radius: 24px;
    width: 45%;
    min-width: 300px;
    box-shadow: var(--glass-shadow);
    text-align: center;
    transition: transform 0.3s;
    position: relative;
}

.etymology-item:hover {
    transform: translateY(-5px);
}

.etymology-item h3 {
    font-family: 'Cormorant Garamond', serif;
    font-size: 2.5rem;
    color: var(--accent-gold);
    margin: 0 0 10px 0;
}

.lang-origin {
    display: block;
    font-size: 0.95rem;
    color: var(--text-sub);
    margin-bottom: 20px;
    font-weight: 500;
    opacity: 0.8;
}

.plus-sign {
    font-size: 3rem;
    color: var(--accent-blue);
    font-weight: 300;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-explanation {
    margin-top: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 60px;
    text-align: left;
}

.logo-visual {
    flex: 1;
    max-width: 300px;
    padding: 40px;
    background: var(--bg-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.03);
}

.logo-visual img {
    width: 60%;
    height: auto;
}

.logo-text {
    flex: 1;
    max-width: 500px;
}

.logo-text h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-main);
    border-bottom: 2px solid var(--accent-green);
    display: inline-block;
    padding-bottom: 5px;
}

/* 
    【Structureセクション（カード）】
*/
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 20px;
}

.card {
    background: var(--glass-bg);
    border: 1px solid white;
    padding: 50px 35px;
    border-radius: 24px;
    text-align: left;
    transition: all 0.4s ease;
    box-shadow: var(--glass-shadow);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-15px);
    box-shadow: 0 20px 40px rgba(31, 38, 135, 0.15);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: #ccc;
}

#park.card::before {
    background: var(--accent-green);
}

#lake.card::before {
    background: var(--accent-blue);
}

#grassland.card::before {
    background: var(--accent-gold);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 25px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.card-title {
    font-size: 1.6rem;
    margin-bottom: 15px;
    font-weight: 700;
    color: var(--text-main);
}

.card-subtitle {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.1rem;
    color: var(--text-sub);
    display: block;
    margin-top: 5px;
    font-weight: 400;
    font-style: italic;
}

.card-desc {
    font-size: 1rem;
    color: var(--text-sub);
    line-height: 1.9;
}

.keyword-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-sub);
    margin: 5px 5px 5px 0;
    padding: 0;
    text-align: left;
    max-width: 750px;
    margin: 0 auto;
}

.value-list {
    list-style: none;
    padding: 0;
    margin: 0 auto;
    max-width: 750px;
}

.value-list li {
    display: flex;
    gap: 25px;
    margin-bottom: 30px;
    padding: 30px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.03);
    transition: transform 0.3s;
    align-items: center;
    /* PCでもアイコンとテキストを垂直方向中央揃え */
    text-align: left;
    /* PCでは左揃え */
}

.value-list li:hover {
    transform: scale(1.02);
}

.check-icon {
    color: var(--accent-blue);
    font-size: 1.5rem;
    background: #eef7ff;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    flex-shrink: 0;
    /* アイコンが縮まないように */
}

.value-text strong {
    display: block;
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text-main);
}

.value-text p {
    margin: 0;
    font-size: 1rem;
    color: var(--text-sub);
}

/* 
    【CTAセクション】
*/
.cta {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, #e6f3ff 100%);
    padding: 40px 20px 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.cta-content {
    max-width: 800px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cta-title {
    font-size: 3rem;
    margin-bottom: 25px;
    color: var(--text-main);
    width: 100%;
    text-align: center;
}

.cta-text {
    margin-bottom: 50px;
    color: var(--text-sub);
    font-size: 1.2rem;
    width: 100%;
    text-align: center;
}

.btn-large {
    padding: 20px 70px;
    font-size: 1.2rem;
    display: inline-block;
}

.cta-note {
    margin-top: 25px;
    font-size: 0.9rem;
    color: var(--text-sub);
    opacity: 0.8;
    width: 100%;
    text-align: center;
}

/* 
    【フッター】
*/
.footer {
    padding: 60px 0;
    border-top: none;
    text-align: center;
    background: #f9fbfd;
}

.footer-logo img {
    height: 35px;
    margin-bottom: 25px;
    opacity: 0.8;
}

.copyright {
    font-size: 0.85rem;
    color: #99aab5;
}

/* 
    【レスポンシブ対応 (SP)】
    最後に記述して上書きする
*/
@media (max-width: 768px) {
    .main-copy {
        font-size: 2.5rem;
    }

    .header {
        padding: 10px 0;
    }

    .header-container {
        flex-direction: column;
        gap: 10px;
    }

    .logo img {
        height: 30px;
    }

    .hero {
        padding-top: 150px;
        min-height: 80vh;
        height: auto;
    }

    .nav ul {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .section-title {
        font-size: 2.2rem;
    }

    .card {
        padding: 30px 20px;
    }

    /* AboutセクションのSP対応 */
    .etymology-box {
        flex-direction: column;
        /* 縦並び */
        gap: 20px;
        align-items: center;
    }

    .etymology-item {
        width: 100%;
        min-width: auto;
        max-width: 100%;
    }

    .plus-sign {
        transform: rotate(90deg);
        /* 回転 */
        margin: 10px 0;
    }

    .logo-explanation {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }

    .logo-text {
        text-align: left;
    }

    /* ValueセクションのSP対応 */
    .value-list li {
        flex-direction: column;
        text-align: center;
        align-items: center;
        padding: 30px 20px;
    }

    .value-text strong {
        margin-bottom: 15px;
    }

    .container {
        padding-left: 15px;
        padding-right: 15px;
        width: 100%;
    }

    section {
        padding: 30px 0;
    }
}

    section {
        padding: 30px 0;
    }

}