/* Base Settings */
        :root {
  --primary-blue: #df0523; /* AltX brand red */
  --accent-teal: #0a92e2;  /* Accent blue */
  --dark-navy: #111827;
  --text-gray: #374151;
  --bg-light: #f3f4f6;
  --white: #ffffff;
  --border: #e5e7eb;
  --shadow: 0 10px 30px rgba(17, 24, 39, 0.10);
}

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

        body {
            font-family: 'Noto Sans JP', sans-serif;
            color: var(--text-gray);
            line-height: 1.8;
            background-color: var(--white);
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        ul {
            list-style: none;
        }

        /* Utility Classes */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .section {
            padding: 80px 0;
        }

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

        .text-center {
            text-align: center;
        }

        .btn {
            display: inline-block;
            padding: 15px 30px;
            border-radius: 10px;
      font-weight: 700;
      letter-spacing: .02em;
      transition: all 0.3s ease;
            cursor: pointer;
        }

        .btn-primary {
            background-color: var(--primary-blue);
            color: white;
            box-shadow: 0 4px 15px rgba(223, 5, 35, 0.22);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(223, 5, 35, 0.30);
        }

        .btn-outline {
            border: 2px solid var(--white);
            color: var(--white);
            background: transparent;
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        h2.section-title {
            font-size: 36px;
            color: var(--dark-navy);
            margin-bottom: 20px;
            text-align: center;
            font-weight: 700;
        }
        
        h2.section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--primary-blue);
            margin: 15px auto 0;
            border-radius: 2px;
        }

        /* Header */
        header {
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.95);
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            padding: 15px 0;
        }

        header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 24px;
            font-weight: 700;
            color: var(--dark-navy);
            font-family: 'Poppins', sans-serif;
        }
        
        .logo span {
            color: var(--primary-blue);
        }

        nav ul {
            display: flex;
            gap: 30px;
        }

        nav a {
            font-weight: 500;
            font-size: 14px;
            color: var(--dark-navy);
            transition: color 0.3s;
        }

        nav a:hover {
            color: var(--primary-blue);
        }

        /* Hero Section */
        .hero {
            /* Updated: チームの連携と活気を感じさせる高品質な画像に変更し、フィルターを微調整 */
            background: linear-gradient(135deg, rgba(17, 24, 39, 0.90), rgba(10, 146, 226, 0.55)), url('https://images.unsplash.com/photo-1522071820081-009f0129c71c?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
            background-size: cover;
            background-position: center;
            height: 80vh;
            min-height: 600px;
            display: flex;
            align-items: center;
            color: white;
            text-align: center;
            margin-top: 60px;
        }

        .hero h1 {
            font-size: 48px;
            margin-bottom: 20px;
            line-height: 1.3;
        }

        .hero p {
            font-size: 20px;
            margin-bottom: 40px;
            opacity: 0.9;
        }

        .hero-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Introduction / Concept */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
            margin-top: 40px;
        }

        .intro-text h3 {
            font-size: 28px;
            margin-bottom: 20px;
            color: var(--dark-navy);
        }

        .intro-img img {
            width: 100%;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }

        /* Strengths */
        .strengths-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .strength-card {
            background: white;
            padding: 40px 30px;
            border-radius: 12px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
            transition: transform 0.3s;
            border-top: 5px solid var(--primary-blue);
        }

        .strength-card:hover {
            transform: translateY(-5px);
        }

        .strength-icon {
            font-size: 40px;
            color: var(--accent-teal);
            margin-bottom: 20px;
        }

        .strength-card h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: var(--dark-navy);
        }

        /* Challenges */
        .challenges-list {
            background: white;
            border-radius: 12px;
            padding: 40px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
            max-width: 800px;
            margin: 0 auto;
        }

        .challenge-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 20px;
            padding-bottom: 20px;
            border-bottom: 1px solid #eee;
        }

        .challenge-item:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }

        .challenge-item i {
            color: #ef4444; /* Red for alert */
            font-size: 24px;
            margin-right: 20px;
            margin-top: 3px;
        }

        /* Process Flow */
        .process-steps {
            display: flex;
            justify-content: space-between;
            margin-top: 50px;
            position: relative;
            flex-wrap: wrap;
            gap: 20px;
        }

        .step {
            flex: 1;
            min-width: 220px;
            background: white;
            padding: 30px 20px;
            border-radius: 12px;
            text-align: center;
            position: relative;
            z-index: 2;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            border: 1px solid #e2e8f0;
        }

        .step-number {
            width: 40px;
            height: 40px;
            background: var(--primary-blue);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 18px;
            margin: 0 auto 20px;
        }

        .step h3 {
            font-size: 18px;
            margin-bottom: 10px;
            color: var(--dark-navy);
        }

        .step p {
            font-size: 14px;
            color: var(--text-gray);
        }

        /* Lineup */
        .lineup-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .lineup-item {
            position: relative;
            overflow: hidden;
            border-radius: 12px;
            background: var(--dark-navy);
            color: white;
            height: 300px;
        }

        .lineup-item img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.6;
            transition: opacity 0.3s;
        }

        .lineup-item:hover img {
            opacity: 0.4;
        }

        .lineup-content {
            position: absolute;
            bottom: 0;
            left: 0;
            padding: 30px;
            width: 100%;
            background: linear-gradient(to top, rgba(0,0,0,0.9), transparent);
        }

        /* Partnership */
        .partnership-box {
            display: flex;
            align-items: center;
            background: white;
            border-radius: 12px;
            padding: 40px;
            gap: 40px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
        }
        
        /* CTA Section */
        .cta-section {
            background: var(--primary-blue);
            color: white;
            text-align: center;
            padding: 80px 20px;
        }

        .cta-section h2 {
            font-size: 36px;
            margin-bottom: 20px;
        }
        
        .cta-btn {
            background: white;
            color: var(--primary-blue);
            padding: 15px 40px;
            font-size: 20px;
            border-radius: 10px;
            font-weight: bold;
            margin-top: 30px;
            display: inline-block;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }

        /* Footer */
        footer {
            background: var(--dark-navy);
            color: #94a3b8;
            padding: 40px 0;
            text-align: center;
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .hero h1 { font-size: 32px; }
            .intro-grid { grid-template-columns: 1fr; }
            .partnership-box { flex-direction: column; text-align: center; }
            .process-steps { flex-direction: column; }
            .step { margin-bottom: 20px; }
            nav ul { display: none; } /* Simplified for mobile */
        }