:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --text-main: #1f2937;
    --text-sub: #6b7280;
    --bg-body: #f3f4f6;
    --bg-card: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 16px;
}

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

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* 背景の装飾 */
.background-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: 
        radial-gradient(circle at 10% 20%, rgba(79, 70, 229, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.05) 0%, transparent 40%);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Header */
.hero {
    text-align: center;
    margin-bottom: 60px;
    padding: 40px 0;
    animation: fadeInDown 0.8s ease-out;
}

.profile-icon {
    font-size: 48px;
    margin-bottom: 16px;
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary) 0%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-sub);
    font-size: 1.1rem;
}

/* Main Content */
.category-label {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-sub);
    margin-bottom: 16px;
    margin-left: 4px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: flex-start;
    gap: 16px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.03) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(79, 70, 229, 0.2);
}

.card:hover::before {
    opacity: 1;
}

.card-icon {
    font-size: 32px;
    background: #f3f4f6;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
    background: #eef2ff;
}

.card-content {
    flex: 1;
}

.card h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-main);
}

.card p {
    font-size: 0.95rem;
    color: var(--text-sub);
    line-height: 1.6;
}

.card-arrow {
    color: var(--primary);
    font-weight: bold;
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.card:hover .card-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* Footer */
footer {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid #e5e7eb;
    color: var(--text-sub);
    font-size: 0.9rem;
}

.social-links {
    margin-top: 12px;
}

.social-links a {
    color: var(--text-sub);
    text-decoration: none;
    margin: 0 8px;
    transition: color 0.2s;
}

.social-links a:hover {
    color: var(--primary);
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 20px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .grid {
        grid-template-columns: 1fr;
    }
}