@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

#Performance {
    max-width: 800px;
    height: 100%;
    margin: 0 auto;
    display: grid;
    gap: 1.5rem;

    /* --- 1. スタート画面（巨大ボタン） --- */
    .start-gate {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;

        .btn-primary-large {
            padding: 1.5rem;
            font-size: 1.6rem;
            font-weight: 900;
            border-radius: 5rem;
            background: #fff;
            color: #000;
            border: none;
            cursor: pointer;
            box-shadow: 0 10px 40px rgba(0, 212, 255, 0.15);
            transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);

            &:hover { 
                transform: scale(1.08); 
                box-shadow: 0 15px 50px rgba(0, 212, 255, 0.3);
            }
            &:active { transform: scale(0.95); }
        }

        .status-msg {
            margin-top: 2rem;
            color: var(--text-dim);
            font-size: 0.85rem;
            letter-spacing: 0.15em;
            text-transform: uppercase;
        }
    }

    /* --- 2. メイン表示エリア（計測中・結果） --- */
    #main-display {
        animation: fadeIn 0.8s ease forwards;
    }

    /* ビジュアルキャンバス */
    .canvas-container {
        position: relative;
        height: 10rem;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 1.25rem;
        margin-bottom: 1.5rem;
        overflow: hidden;
        border: 1px solid rgba(128, 128, 128, 0.15);
        
        canvas { width: 100%; height: 100%; display: block; }
        
        .canvas-label {
            position: absolute;
            top: 1rem;
            left: 1.25rem;
            font-size: 0.7rem;
            color: #00d4ff;
            font-weight: 800;
            letter-spacing: 0.1em;
            text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
        }
    }

    /* 診断結果カード（最重要） */
    .verdict-card {
        padding: 2rem 1.5rem;
        border: 2px solid rgba(128, 128, 128, 0.3);
        border-radius: 1.5rem;
        text-align: center;
        background: rgba(255, 255, 255, 0.02);
        margin-bottom: 1rem;
        animation: fadeIn 0.5s ease;

        .rank-label {
            font-size: 1.8rem;
            font-weight: 950;
            margin-bottom: 0.75rem;
            letter-spacing: 0.2em;
            line-height: 1;
        }
        .verdict-text {
            font-size: 1rem;
            line-height: 1.7;
            color: var(--text-dim);
            font-weight: 500;
        }
    }

    /* スコアボード */
    .snappiness-hero {
        padding: 2.5rem 1.5rem;
        border-radius: 1.5rem;
        border: 1px solid rgba(128, 128, 128, 0.2);
        background: rgba(128, 128, 128, 0.03);
        text-align: center;
        margin-bottom: 1rem;

        .label {
            font-size: 0.75rem;
            color: var(--text-dim);
            font-weight: 700;
            letter-spacing: 0.1em;
        }
        .value {
            font-size: 4rem;
            font-weight: 900;
            line-height: 1;
            margin: 0.75rem 0;
            letter-spacing: -0.02em;
        }
    }

    .sub-stats-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
        margin-bottom: 2rem;

        .stat-card {
            padding: 1.25rem 0.75rem;
            border-radius: 1.25rem;
            border: 1px solid rgba(128, 128, 128, 0.15);
            text-align: center;
            
            .label {
                display: block;
                font-size: 0.65rem;
                color: var(--text-dim);
                margin-bottom: 0.5rem;
                font-weight: 700;
                text-transform: uppercase;
            }
            .value {
                font-size: 1.4rem;
                font-weight: 800;
            }
            .unit {
                font-size: 0.7rem;
                color: var(--text-dim);
                margin-left: 0.2rem;
            }
        }

        /* --- スマホサイズ(600px以下)の調整 --- */
        @media (max-width: 600px) {
            grid-template-columns: repeat(2, 1fr); /* 2カラムに変更 */

            /* 最初のカード（MULTI_CORE）を1段ぶち抜きにする */
            #card-multi {
                grid-column: span 2;
                padding: 1.5rem 1rem;
                background: rgba(128, 128, 128, 0.05); /* 少し目立たせる */

                .value {
                    font-size: 1.8rem; /* 少し大きく */
                }
            }
        }
    }

    /* デバイス名登録 */
    .registry-card {
        padding: 1.5rem;
        border: 1px solid rgba(128, 128, 128, 0.2);
        border-radius: 1.25rem;
        background: rgba(0, 212, 255, 0.03);
        margin-bottom: 2rem;

        .label {
            font-size: 0.75rem;
            color: var(--text-dim);
            margin-bottom: 1rem;
            font-weight: 800;
        }
        .input-group {
            display: flex;
            gap: 0.5rem;
            
            input {
                flex: 1;
                background: rgba(0, 0, 0, 0.3);
                border: 1px solid rgba(128, 128, 128, 0.3);
                color: #fff;
                padding: 0.85rem 1rem;
                border-radius: 0.75rem;
                font-size: 1rem;
                outline: none;
                transition: border-color 0.3s;
                &:focus { border-color: #00d4ff; }
            }

            button {
                background: #00d4ff;
                color: #000;
                border: none;
                padding: 0 1rem;
                border-radius: 0.75rem;
                font-weight: 900;
                cursor: pointer;
                transition: all 0.2s;
                &:hover { opacity: 0.9; transform: translateY(-1px); }
                &:active { transform: translateY(0); }
                &:disabled { opacity: 0.5; cursor: default; }
            }
        }
    }

    /* リスタートエリア */
    .restart-area {
        text-align: center;
        padding: 2rem 0;
        
        .btn-secondary {
            background: transparent;
            color: var(--text-dim);
            border: 1px solid rgba(128, 128, 128, 0.3);
            padding: 0.8rem 2.5rem;
            border-radius: 3rem;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.3s;
            
            &:hover {
                color: #fff;
                border-color: #fff;
                background: rgba(255, 255, 255, 0.05);
            }
        }
    }
}