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

        :root {
            --primary: #fe2c55;
            --secondary: #00f2ea;
            --bg: #0a0a0a;
            --card-bg: #141414;
            --card-border: #222;
            --text: #ffffff;
            --text-dim: #888;
        }

        body {
            background: var(--bg);
            color: var(--text);
            font-family: 'Inter', sans-serif;
            overflow-x: hidden;
        }

        /* --- ナビゲーション --- */
        .nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            padding: 16px 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: rgba(10, 10, 10, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .nav-logo {
            font-size: 1.3rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .nav-links {
            display: flex;
            gap: 12px;
            align-items: center;
        }

        .nav-links a {
            color: var(--text-dim);
            text-decoration: none;
            font-size: 0.9rem;
            padding: 8px 16px;
            border-radius: 8px;
            transition: all 0.2s;
            white-space: nowrap;
        }

        .nav-links a:hover {
            color: var(--text);
            background: rgba(255, 255, 255, 0.05);
        }

        .btn-login {
            background: rgba(255, 255, 255, 0.08) !important;
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: var(--text) !important;
            font-weight: 600;
        }

        .btn-cta {
            background: var(--primary) !important;
            color: #fff !important;
            font-weight: 600;
            border: none;
        }

        .btn-cta:hover {
            filter: brightness(1.15);
            transform: translateY(-1px);
        }

        /* 言語切替ボタン */
        .lang-switcher {
            display: flex;
            gap: 5px;
            margin-left: 10px;
            background: #222;
            padding: 3px;
            border-radius: 6px;
        }

        .lang-btn {
            background: none;
            border: none;
            color: #666;
            font-size: 11px;
            padding: 4px 8px;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 700;
            transition: all 0.2s;
        }

        .lang-btn:hover {
            color: #aaa;
        }

        .lang-btn.active {
            background: #333;
            color: var(--secondary);
        }

        /* --- ヒーローセクション --- */
        .hero {
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            padding: 120px 20px 80px;
            position: relative;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(254, 44, 85, 0.12) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(254, 44, 85, 0.1);
            border: 1px solid rgba(254, 44, 85, 0.25);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.8rem;
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 28px;
        }

        .hero h1 {
            font-size: clamp(2.2rem, 6vw, 4rem);
            font-weight: 900;
            line-height: 1.15;
            margin-bottom: 20px;
            max-width: 700px;
        }

        .hero h1 .gradient-text {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            font-size: 1.1rem;
            color: var(--text-dim);
            max-width: 550px;
            line-height: 1.7;
            margin-bottom: 40px;
        }

        .hero-buttons {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .hero-btn {
            padding: 14px 32px;
            border-radius: 12px;
            font-size: 1rem;
            font-weight: 700;
            text-decoration: none;
            transition: all 0.25s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }

        .hero-btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 20px rgba(254, 44, 85, 0.35);
        }

        .hero-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(254, 44, 85, 0.45);
        }

        .hero-btn-secondary {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .hero-btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
        }

        /* --- 特徴セクション --- */
        .section {
            padding: 80px 20px;
            max-width: 1100px;
            margin: 0 auto;
        }

        .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .section-sub {
            text-align: center;
            color: var(--text-dim);
            font-size: 1rem;
            margin-bottom: 60px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
        }

        .feature-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 16px;
            padding: 32px 28px;
            transition: all 0.3s;
        }

        .feature-card:hover {
            border-color: rgba(254, 44, 85, 0.3);
            transform: translateY(-4px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 18px;
        }

        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .feature-card p {
            color: var(--text-dim);
            font-size: 0.9rem;
            line-height: 1.6;
        }



        /* --- CTA セクション --- */
        .cta-section {
            text-align: center;
            padding: 80px 20px;
            position: relative;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 500px;
            height: 400px;
            background: radial-gradient(circle, rgba(0, 242, 234, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .cta-section p {
            color: var(--text-dim);
            margin-bottom: 32px;
            font-size: 1rem;
        }

        /* --- フッター --- */
        .footer {
            text-align: center;
            padding: 40px 20px;
            border-top: 1px solid var(--card-border);
            color: var(--text-dim);
            font-size: 0.8rem;
        }

        /* --- アニメーション --- */
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .animate {
            animation: fadeUp 0.7s ease-out forwards;
            opacity: 0;
        }

        .delay-1 {
            animation-delay: 0.1s;
        }

        .delay-2 {
            animation-delay: 0.2s;
        }

        .delay-3 {
            animation-delay: 0.3s;
        }

        @media (max-width: 800px) {
            .nav {
                padding: 12px 10px;
                flex-direction: column;
                align-items: center;
                gap: 8px;
                height: auto;
                position: relative;
                width: 100%;
            }

            .nav-logo {
                font-size: 1.2rem;
                text-align: center;
                margin-bottom: 2px;
            }

            .nav-links {
                width: 100%;
                justify-content: center;
                gap: 6px;
                flex-wrap: wrap;
            }

            .nav-links a {
                padding: 6px 10px;
                font-size: 0.8rem;
            }

            .hero {
                padding: 80px 16px 60px;
                width: 100%;
                display: flex;
                flex-direction: column;
                align-items: center;
            }

            .hero h1 {
                font-size: 2.2rem;
                max-width: 100%;
                text-align: center;
                margin-left: auto;
                margin-right: auto;
            }

            .hero p {
                font-size: 1rem;
                max-width: 100%;
                text-align: center;
                margin-left: auto;
                margin-right: auto;
            }

            .hero-buttons {
                gap: 12px;
                flex-direction: column;
                width: 100%;
                max-width: 320px;
                margin: 0 auto;
            }

            .hero-btn {
                width: 100%;
                justify-content: center;
                padding: 14px 24px;
                font-size: 1rem;
            }

            .section {
                padding: 60px 16px;
                width: 100%;
            }

            .section-title {
                font-size: 1.8rem;
                text-align: center;
            }

            .features-grid {
                grid-template-columns: 1fr;
                max-width: 500px;
                margin: 0 auto;
            }
        }