/* =========================================
   1. 目に優しい配色 (Soft White & Modern Blue)
   ========================================= */
:root {
    --bg-main: #fbfbfd; 
    --bg-nav: rgba(251, 251, 253, 0.8);
    --bg-card: #ffffff;
    --text-main: #1d1d1f;
    --text-sub: #6e6e73;
    --accent: #0071e3;
    --border: #d2d2d7;
    --shadow-sm: 0 8px 24px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.08);
    --toggle-bg: #f5f5f7;
    --toggle-border: #d2d2d7;
}

[data-theme="dark"] {
    --bg-main: #000000;
    --bg-nav: rgba(22, 22, 23, 0.8);
    --bg-card: #1c1c1e;
    --text-main: #f5f5f7;
    --text-sub: #a1a1a6;
    --accent: #00a2ff;
    --border: #333336;
    --shadow-sm: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.4);
    --toggle-bg: #323235;
    --toggle-border: #636366;
}

/* =========================================
   2. ベース設定
   ========================================= */
* { box-sizing: border-box; }
body {
    margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Serif JP", serif;
    background-color: var(--bg-main); color: var(--text-main);
    transition: background-color 0.4s ease; line-height: 1.6; overflow-x: hidden;
}

.page { display: none; opacity: 0; }
.page.active { display: block; animation: pageFadeIn 0.8s forwards ease-out; }
@keyframes pageFadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.reveal {
    opacity: 0; transition: all 1.2s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform: translateY(40px);
}
.reveal.active { opacity: 1; transform: translate(0, 0); }

/* =========================================
   3. ナビゲーション
   ========================================= */
.navbar {
    position: sticky; top: 0; z-index: 1000;
    background-color: var(--bg-nav); backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}
.nav-container {
    max-width: 1200px; margin: 0 auto;
    display: flex; justify-content: space-between; align-items: center; padding: 0.8rem 2rem;
}
.nav-logo {
    font-size: 1.4rem; font-weight: 700; text-decoration: none; color: var(--text-main);
}
.nav-right { display: flex; align-items: center; gap: 30px; }
.nav-links { display: flex; gap: 5px; }
.nav-item {
    text-decoration: none; color: var(--text-main); font-weight: 500;
    padding: 8px 16px; border-radius: 8px; transition: 0.3s;
}
.nav-item:hover, .active-link { color: var(--accent); }

/* --- テーマ切替ボタン (40px x 40px / radius 15px) --- */
.theme-toggle {
    background: var(--toggle-bg); border: 1px solid var(--toggle-border);
    width: 40px; height: 40px; 
    border-radius: 15px;
    cursor: pointer;
    position: relative; display: flex; align-items: center; justify-content: center; overflow: hidden;
    transition: all 0.3s ease;
    padding: 0;
}
.theme-toggle:hover { 
    border-color: var(--accent);
    background: var(--bg-card);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.mode-icon { 
    position: absolute; 
    width: 20px; 
    transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1); 
}
[data-theme="light"] .moon-img { transform: translateY(30px); opacity: 0; }
[data-theme="dark"] .sun-img { transform: translateY(-30px); opacity: 0; }

/* =========================================
   4. ヒーローセクション
   ========================================= */
.hero { text-align: center; padding: 8rem 0; }
#hero-title {
    font-size: clamp(2.5rem, 8vw, 4.2rem); font-weight: 700;
    letter-spacing: -0.02em; margin-bottom: 1rem;
    display: flex; justify-content: center; flex-wrap: wrap;
}
.char-grad {
    display: inline-block; animation: colorShift 5s infinite linear;
}
@keyframes colorShift {
    0%, 100% { color: var(--text-main); }
    50% { color: var(--accent); }
}

/* =========================================
   5. ニュースセクション
   ========================================= */
.home-news-section { max-width: 800px; margin: 6rem auto; padding: 0 2rem; }
.section-header {
    display: flex; justify-content: space-between; align-items: baseline;
    margin-bottom: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.8rem;
}
.text-link {
    text-decoration: none; color: var(--accent); font-weight: 600;
    font-size: 0.95rem; transition: 0.3s;
}
.text-link:hover { text-decoration: underline; opacity: 0.8; }

.news-item { display: flex; align-items: center; padding: 1.2rem 0; border-bottom: 1px solid var(--border); gap: 20px; }
.news-date { font-weight: 600; font-size: 0.9rem; color: var(--text-sub); min-width: 100px; }
.news-title { font-size: 1rem; margin: 0; font-weight: 500; }

/* =========================================
   6. レイアウト・カード
   ========================================= */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.z-row { display: flex; align-items: center; gap: 60px; margin: 8rem 0; }
.z-row.reverse { flex-direction: row-reverse; }
.z-text { flex: 1; }
.z-image { flex: 1.2; }
.placeholder-img {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 24px; aspect-ratio: 16/9; width: 100%;
    display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow-sm); color: var(--text-sub);
}

.card-grid {
    display: flex; flex-wrap: wrap; justify-content: center;
    gap: 24px; margin: 4rem auto;
}
.card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 20px; padding: 3rem 2rem; width: 300px;
    box-shadow: var(--shadow-sm); transition: 0.4s; text-align: center;
}
.card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: var(--accent); }

/* =========================================
   7. CTA
   ========================================= */
.cta-box {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 30px; padding: 5rem 2rem; text-align: center; margin: 8rem 0;
}
.cta-button {
    display: inline-block; background: var(--accent); color: #fff !important;
    text-decoration: none; padding: 14px 36px; border-radius: 50px;
    font-weight: 600; margin-top: 1.5rem; transition: 0.3s;
}
.cta-button:hover { transform: scale(1.03); filter: brightness(1.1); }

/* --- 前略：1〜7 セクションは変更なし --- */

/* =========================================
   8. フッター
   ========================================= */
.footer { 
    background: var(--bg-main); 
    border-top: 1px solid var(--border); 
    padding: 4rem 2rem; 
}
.footer-container { 
    max-width: 1200px; 
    margin: 0 auto; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
}

/* フッターロゴのスタイルを適用 */
.footer-logo {
    font-size: 1.4rem; 
    font-weight: 700; 
    text-decoration: none; 
    color: var(--text-main);
    transition: 0.3s;
    display: inline-block;
}
.footer-logo:hover {
    color: var(--accent);
}

.footer-copyright { 
    font-size: 0.85rem; 
    color: var(--text-sub); 
    margin-top: 0.5rem;
}

.nav-item-footer { 
    text-decoration: none; 
    color: var(--text-sub); 
    font-size: 0.9rem; 
    margin-left: 20px; 
    transition: 0.3s; 
}
.nav-item-footer:hover, .nav-item-footer.active-link { 
    color: var(--accent); 
}

@media (max-width: 768px) {
    .footer-container { 
        flex-direction: column; 
        gap: 2rem; 
        text-align: center; 
    }
    .nav-item-footer {
        margin: 0 10px;
    }
}

/* 画像のスタイル設定 */
.content-img {
    width: 100%;
    height: auto;
    aspect-ratio: 16/9; /* 元のプレースホルダーと同じ比率を維持 */
    object-fit: cover;  /* 枠に合わせて画像を切り抜き表示 */
    border-radius: 24px; /* 既存のデザインに合わせた角丸 */
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    display: block;
}