@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&family=Outfit:wght@300;400;600&display=swap');

:root {
    --primary-color: #2563EB; /* Royal Blue */
    --secondary-color: #EF4444; /* Red accent for rackets */
    --bg-color: #0F172A; /* Slate 900 */
    --card-bg: rgba(30, 41, 59, 0.7); /* Slate 800 with opacity */
    --text-color: #F1F5F9; /* Slate 100 */
    --text-muted: #94A3B8; /* Slate 400 */
    --glass-border: rgba(255, 255, 255, 0.1);
    --hover-glow: 0 0 20px rgba(37, 99, 235, 0.5);
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Noto Sans JP', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(239, 68, 68, 0.1) 0%, transparent 40%);
    min-height: 100vh;
}

/* Header / Hero Section */
header {
    position: relative;
    width: 100%;
    height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
    filter: brightness(0.6);
    transition: transform 10s ease;
}

header:hover .hero-image {
    transform: scale(1.05);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 2rem;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 1s ease-out;
}

h1 {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 0.05em;
}

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

/* Main Content Grid */
main {
    max-width: 1200px;
    margin: -4rem auto 4rem;
    position: relative;
    z-index: 3;
    padding: 0 2rem;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* Glassmorphism Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    padding: 1.5rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--text-color);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--hover-glow);
    border-color: rgba(37, 99, 235, 0.5);
    background: rgba(30, 41, 59, 0.9);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    background: rgba(37, 99, 235, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.card-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: #fff;
}

.card-description {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.5;
}

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

.fade-in {
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        height: 50vh;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    main {
        margin-top: -2rem;
        padding: 0 1rem;
    }
    
    .grid-container {
        grid-template-columns: 1fr;
    }
}