body {
            background: linear-gradient(-45deg, #1a1a2e, #16213e, #0f3460, #533483);
            background-size: 400% 400%;
            animation: gradient 15s ease infinite;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            color: white;
        }

        .glass-card {
            background: rgba(255, 255, 255, 0.03);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 2rem;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        }

        .mode-btn {
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
        }

        .mode-btn::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: white;
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }

        .mode-btn.active::after {
            width: 60%;
        }

        .mode-btn.active {
            color: white;
            background: rgba(255, 255, 255, 0.1);
        }

        .motto-text {
            text-shadow: 0 0 30px rgba(255, 255, 255, 0.3);
            line-height: 1.2;
        }

        .record-pulse {
            animation: pulse-ring 1.5s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }

        @keyframes pulse-ring {
            0% { transform: scale(1); opacity: 0.5; }
            100% { transform: scale(1.5); opacity: 0; }
        }

        input:checked + label {
            text-decoration: line-through;
            opacity: 0.5;
        }

        .no-scrollbar::-webkit-scrollbar { display: none; }
        .no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }