*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    body {
        font-family: 'Noto Sans JP', sans-serif;
        background: #f8fafc;
        color: #334155;
        min-height: 100vh;
    }

    /* ヘッダー */
    .site-header {
        background: #fff;
        border-bottom: 1px solid #e2e8f0;
        height: 56px;
        display: flex;
        align-items: center;
        padding: 0 20px;
        position: sticky;
        top: 0;
        z-index: 10;
        box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    }
    .site-header a.back-btn {
        text-decoration: none;
        font-size: 13px;
        color: #64748b;
        display: flex;
        align-items: center;
        gap: 6px;
    }
    .site-header a.back-btn:hover { color: #6366f1; }
    .logo {
        font-size: 18px;
        font-weight: 900;
        letter-spacing: -0.5px;
        color: #1e293b;
        margin-left: auto;
    }
    .logo span { color: #6366f1; }

    /* フッター */
    .page-footer {
        text-align: center;
        padding: 24px 16px;
        background: #fff;
        border-top: 1px solid #e2e8f0;
    }
    .page-footer p {
        font-size: 11px;
        color: #94a3b8;
        margin-bottom: 8px;
    }
    .page-footer a {
        font-size: 12px;
        color: #6366f1;
        text-decoration: none;
        font-weight: 600;
        display: inline-flex;
        align-items: center;
        gap: 4px;
    }
    .page-footer a:hover { text-decoration: underline; }

/* ------------------------------------
    ブログ用 Tailwind不足クラス補完（完全版）
------------------------------------ */

/* グラデーション */
.from-blue-600 {
    --tw-gradient-from: #2563eb var(--tw-gradient-from-position);
    --tw-gradient-to: rgb(37 99 235 / 0) var(--tw-gradient-to-position);
    --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to);
}
.to-indigo-700 {
    --tw-gradient-to: #4338ca var(--tw-gradient-to-position);
}

/* 余白 (Padding) */
.pl-3 { padding-left: 0.75rem; /* 12px */ }
.px-2\.5 { padding-left: 0.625rem; padding-right: 0.625rem; /* 10px */ }
.py-3\.5 { padding-top: 0.875rem; padding-bottom: 0.875rem; /* 14px */ }
.pb-12 { padding-bottom: 3rem; /* 48px */ }
.pt-3 { padding-top: 0.75rem; /* 12px */ }
.pt-8 { padding-top: 2rem; }
.pt-10 { padding-top: 2.5rem; }
.my-8 { margin-top: 2rem; margin-bottom: 2rem;}
.my-12 { margin-top: 3rem; margin-bottom: 3rem;}
.ml-8 { margin-left: 2rem;}


/* サイズ・制限 */
.max-w-\[150px\] { max-width: 150px; }
@media (min-width: 640px) {
    .sm\:max-w-\[300px\] { max-width: 300px; }
}

.list-decimal{ list-style-type: decimal; }

/* 文字色・ボーダー色・シャドウ */
.text-blue-700 { color: #1d4ed8; }
.border-blue-500 { border-color: #3b82f6; }
.shadow-inner { box-shadow: inset 0 2px 4px 0 rgb(0 0 0 / 0.05); }

/* アニメーション時間 */
.duration-300 { transition-duration: 300ms; }

/* Hoverアクション */
.hover\:text-blue-600:hover { color: #2563eb; }
.hover\:text-purple-600:hover { color: #9333ea; }
.hover\:text-emerald-600:hover { color: #059669; }
.hover\:text-white:hover { color: #ffffff; }
.hover\:border-blue-200:hover { border-color: #bfdbfe; }
.hover\:border-blue-300:hover { border-color: #93c5fd; }
.hover\:bg-blue-50:hover { background-color: #eff6ff; }
.hover\:bg-\[\#1DA1F2\]:hover { background-color: #1DA1F2; }
.hover\:bg-\[\#06C755\]:hover { background-color: #06C755; }

/* Group-Hoverアクション (親要素にホバーした時の子要素の変化) */
.group:hover .group-hover\:text-blue-600 { color: #2563eb; }
.group:hover .group-hover\:text-purple-600 { color: #9333ea; }
.group:hover .group-hover\:text-emerald-600 { color: #059669; }
.group:hover .group-hover\:scale-105 { transform: scale(1.05); }
.group:hover .group-hover\:gap-2 { gap: 0.5rem; }