:root {
            /* ベースカラー */
            --dolby-base: #0033aa;
            --dolby-bright: #0088ff;
            --edgy-brown: #9E5B22;
            --edgy-dark-brown: #4A2B0E;

            --bg-body: #f4f7fa;
            --bg-card: #ffffff;
            --text-main: #334155;
            --text-muted: #64748b;
            --accent-color: #0ea5e9;

            --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.05), 0 5px 10px rgba(0, 0, 0, 0.01);
            --card-shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.08), 0 10px 20px rgba(0, 0, 0, 0.04);
        }

        body {
            font-family: 'Noto Sans JP', sans-serif;
            background-color: var(--bg-body);
            color: var(--text-main);
            margin: 0;
            padding: 0;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }


        /* --------------------------
           ヒーローセクション (Slim 25vh)
           -------------------------- */
        .hero-slim {
            position: relative;
            width: 100%;
            height: 25vh;
            min-height: 200px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            background: transparent;
            margin-bottom: 1.5rem;
        }

        .sound-wave-container {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 1px;
            height: 1px;
            pointer-events: none;
            z-index: 1;
        }

        .wave {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) scale(0);
            border-radius: 50%;
            background: transparent;
            box-shadow: 0 0 20px rgba(0, 136, 255, 0.4);
            border: 2px solid rgba(102, 178, 255, 0.6);
            opacity: 0;
            filter: blur(4px);
            animation: bass-drop-epic 4.5s cubic-bezier(0.25, 1, 0.5, 1) infinite;
        }

        .wave:nth-child(1) {
            animation-delay: 0s;
            width: 100px;
            height: 100px;
        }

        .wave:nth-child(2) {
            animation-delay: 0.15s;
            width: 100px;
            height: 100px;
        }

        .wave:nth-child(3) {
            animation-delay: 0.3s;
            width: 100px;
            height: 100px;
            border-style: dashed;
        }

        .wave-huge {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 136, 255, 0.8) 0%, rgba(0, 51, 170, 0.5) 50%, transparent 80%);
            filter: blur(15px);
            animation: bass-boom 4.5s cubic-bezier(0.1, 0.9, 0.2, 1) infinite;
        }

        .core {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 60px;
            height: 60px;
            background: radial-gradient(circle, #ffffff 0%, #66b2ff 40%, #0033aa 100%);
            border-radius: 50%;
            filter: blur(8px);
            transform: translate(-50%, -50%);
            box-shadow: 0 0 40px rgba(0, 136, 255, 0.9);
            animation: core-pulsate 4.5s ease-in-out infinite;
        }

        @keyframes bass-drop-epic {
            0% {
                transform: translate(-50%, -50%) scale(0);
                opacity: 0;
            }

            5% {
                transform: translate(-50%, -50%) scale(0.6);
                opacity: 0.6;
                border-color: rgba(102, 178, 255, 0.8);
                box-shadow: 0 0 20px rgba(0, 136, 255, 0.6);
            }

            10% {
                transform: translate(-50%, -50%) scale(0.4);
                opacity: 0.3;
            }

            15% {
                transform: translate(-50%, -50%) scale(0.9);
                opacity: 0.8;
                border-color: rgba(102, 178, 255, 0.9);
                box-shadow: 0 0 30px rgba(0, 136, 255, 0.8);
            }

            20% {
                transform: translate(-50%, -50%) scale(0.7);
                opacity: 0.4;
            }

            28% {
                transform: translate(-50%, -50%) scale(2.0);
                opacity: 1;
                background: rgba(0, 136, 255, 0.05);
                border: 3px solid var(--edgy-brown);
                box-shadow: 0 0 70px rgba(0, 136, 255, 0.9), inset 0 0 20px var(--edgy-dark-brown);
            }

            45% {
                transform: translate(-50%, -50%) scale(6.0);
                opacity: 0;
                border-width: 1px;
                border-color: rgba(102, 178, 255, 0.2);
                box-shadow: transparent;
            }

            100% {
                transform: translate(-50%, -50%) scale(10.0);
                opacity: 0;
            }
        }

        @keyframes bass-boom {
            0% {
                transform: translate(-50%, -50%) scale(0);
                opacity: 0;
            }

            20% {
                transform: translate(-50%, -50%) scale(0);
                opacity: 0;
            }

            25% {
                transform: translate(-50%, -50%) scale(5.0);
                opacity: 0.9;
            }

            50% {
                transform: translate(-50%, -50%) scale(25.0);
                opacity: 0;
            }

            100% {
                transform: translate(-50%, -50%) scale(30.0);
                opacity: 0;
            }
        }

        @keyframes core-pulsate {
            0% {
                transform: translate(-50%, -50%) scale(1);
                filter: blur(8px);
            }

            5% {
                transform: translate(-50%, -50%) scale(1.2);
                filter: blur(12px);
                box-shadow: 0 0 50px rgba(0, 136, 255, 0.8);
            }

            10% {
                transform: translate(-50%, -50%) scale(0.9);
                filter: blur(6px);
            }

            15% {
                transform: translate(-50%, -50%) scale(1.3);
                filter: blur(15px);
                box-shadow: 0 0 60px rgba(0, 136, 255, 0.9);
            }

            20% {
                transform: translate(-50%, -50%) scale(0.85);
                filter: blur(5px);
            }

            28% {
                transform: translate(-50%, -50%) scale(1.8);
                filter: blur(15px);
                box-shadow: 0 0 80px rgba(0, 136, 255, 1), inset 0 0 20px var(--edgy-brown);
                background: #ffffff;
            }

            50% {
                transform: translate(-50%, -50%) scale(1);
                filter: blur(8px);
                box-shadow: 0 0 40px rgba(0, 136, 255, 0.9);
                background: radial-gradient(circle, #ffffff 0%, #66b2ff 40%, #0033aa 100%);
            }

            100% {
                transform: translate(-50%, -50%) scale(1);
                filter: blur(8px);
            }
        }

        .hero-text {
            position: relative;
            z-index: 2;
            width: 100%;
            padding: 0 1rem;
            box-sizing: border-box;
            text-align: center;
        }

        /* --------------------------
           コンテナ・メイン見出し
           -------------------------- */
        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 0 1.2rem;
            box-sizing: border-box;
        }

        .main-heading {
            font-family: 'M PLUS Rounded 1c', sans-serif;
            font-size: clamp(1.4rem, 5vw, 1.8rem);
            font-weight: 800;
            color: var(--dolby-base);
            text-align: center;
            margin: 2rem 0;
            line-height: 1.4;
        }

        /* --------------------------
           チャット吹き出し風 コンテンツ
           -------------------------- */
        .intro-text {
            background: var(--bg-card);
            border-radius: 20px;
            padding: 1.5rem 1.5rem 1.2rem;
            margin-bottom: 2rem;
            box-shadow: var(--card-shadow);
            text-align: left;
            border: 1px solid rgba(0, 0, 0, 0.03);
            font-size: 0.95rem;
            line-height: 1.8;
            color: var(--text-main);
            position: relative;
        }

        .intro-text h2 {
            font-size: 1.1rem;
            color: var(--dolby-base);
            margin-top: 0;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .intro-text p {
            margin: 0.8rem 0;
        }

        .intro-text strong {
            color: var(--edgy-brown);
        }

        .intro-text ul {
            padding-left: 1.2rem;
            margin: 1rem 0;
        }

        .intro-text li {
            margin-bottom: 0.5rem;
        }

        /* --------------------------
           アクションボタン (ピル型)
           -------------------------- */
        .action-area {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1.5rem;
            margin-bottom: 4rem;
        }

        .pill-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--dolby-bright), var(--dolby-base)) !important;
            color: #fff !important;
            text-decoration: none;
            font-weight: bold;
            font-family: 'M PLUS Rounded 1c', sans-serif;
            font-size: 1.1rem;
            padding: 1rem 2rem;
            border-radius: 50px;
            width: 100%;
            max-width: 320px;
            box-shadow: 0 10px 20px rgba(0, 136, 255, 0.3) !important;
            transition: transform 0.3s, box-shadow 0.3s;
            box-sizing: border-box;
        }

        .pill-btn:hover,
        .pill-btn:focus {
            transform: translateY(-3px);
            box-shadow: 0 15px 25px rgba(0, 136, 255, 0.4);
            color: #fff;
        }

        .pill-btn.secondary {
            background: #fff;
            color: var(--text-main);
            border: 2px solid #e2e8f0;
            box-shadow: var(--card-shadow);
        }

        .pill-btn.secondary:hover,
        .pill-btn.secondary:focus {
            border-color: var(--accent-color);
            color: var(--accent-color);
            box-shadow: var(--card-shadow-hover);
        }

        /* アイコン装飾 */
        .icon-bubble::before {
            content: '📑';
            display: block;
            text-align: center;
            margin-bottom: 0.8rem;
            font-size: 2rem;
            filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
        }

        .score-box {
            background: #f8fafc;
            border-left: 4px solid var(--accent-color);
            padding: 1rem;
            border-radius: 8px;
            margin: 1rem 0;
        }