/* 共通の青色基調とダークモード設定 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary-blue: #2563eb;
    --bg-light: #f8fafc;
    --text-light: #0f172a;
    --bg-dark: #0f172a;
    --text-dark: #f8fafc;
}

body {
    font-family: 'Inter', sans-serif;
    transition: background-color 0.3s, color 0.3s;
    margin: 0;
}

body.light { background-color: var(--bg-light); color: var(--text-light); }
body.dark { background-color: var(--bg-dark); color: var(--text-dark); }

.glass-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    padding: 1.5rem;
}

.light .glass-card {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.btn-primary {
    background-color: var(--primary-blue);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: opacity 0.2s;
}

.btn-primary:hover { opacity: 0.9; }

/* ページ遷移用のアニメーション */
.fade-in {
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}