body {
    font-family: 'M PLUS Rounded 1c', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f8ff;
    /* Light, sky-like blue */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    touch-action: manipulation;
}

.home-link {
    position: fixed;
    top: 18px;
    left: 18px;
    z-index: 20;
    padding: 9px 14px;
    border-radius: 999px;
    background-color: rgba(255, 255, 255, 0.82);
    color: #555;
    font-size: 0.9rem;
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

.home-link:hover {
    color: #ff6699;
}

.game-container {
    background-color: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    padding: 30px;
    width: 90%;
    max-width: 600px;
    text-align: center;
    border: 5px solid #ffcc00;
}

header h1 {
    color: #ff6699;
    font-size: 2rem;
    margin-top: 0;
    text-shadow: 2px 2px 0px #fff, 3px 3px 0px rgba(0, 0, 0, 0.1);
}

#main-area {
    margin: 20px 0;
    padding: 20px;
    background-color: #fffacd;
    /* LemonChiffon */
    border-radius: 15px;
    border: 3px dashed #ff9933;
    position: relative;
    overflow: hidden;
}

#emoji-display {
    font-size: 5rem;
    margin: 10px 0;
    transition: transform 0.2s;
}

#word-display {
    font-size: 2rem;
    color: #333;
    font-weight: bold;
}

#ja-word-display {
    font-size: 1.5rem;
    color: #555;
    font-weight: bold;
    margin-top: 5px;
}

#target-key {
    font-size: 4rem;
    color: #ff3366;
    margin-top: 10px;
    font-weight: bold;
    text-shadow: 1px 1px 0px #fff, 2px 2px 0px rgba(0, 0, 0, 0.1);
}

#keyboard-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 20px;
}

.keyboard-row {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-bottom: 6px;
    width: 100%;
}

.keyboard-row-1 {
    padding-left: 20px;
    /* QWERTY offset */
}

.keyboard-row-2 {
    padding-left: 40px;
    /* ASDFGH offset */
}

.keyboard-row-3 {
    padding-left: 60px;
    /* ZXCVBN offset */
}

.key-btn {
    font-family: 'M PLUS Rounded 1c', sans-serif;
    font-size: 1.5rem;
    font-weight: bold;
    width: 45px;
    height: 50px;
    border: 2px solid #ccc;
    border-radius: 8px;
    background-color: #f9f9f9;
    color: #333;
    cursor: pointer;
    box-shadow: 0 4px 0 #ccc;
    transition: all 0.1s;
    user-select: none;
}

.key-btn:active,
.key-btn.active {
    transform: translateY(4px);
    box-shadow: 0 0 0 #ccc;
    background-color: #e0e0e0;
}

/* ターゲットキーのハイライト（目立たせる） */
.highlight-key {
    background-color: #ff9933 !important;
    color: white !important;
    border-color: #e67e22 !important;
    box-shadow: 0 0 15px #ff9933, 0 4px 0 #e67e22 !important;
    transform: scale(1.1);
    z-index: 10;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.controls {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

.mode-btn {
    font-family: 'M PLUS Rounded 1c', sans-serif;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.1s;
    width: 80%;
    max-width: 350px;
}

#start-standard-btn {
    background-color: #4CAF50;
    box-shadow: 0 6px 0 #2e7d32;
}

#start-standard-btn:active {
    transform: translateY(6px);
    box-shadow: 0 0 0 #2e7d32;
}

#start-flag-btn {
    background-color: #2196F3;
    box-shadow: 0 6px 0 #1565C0;
}

#start-flag-btn:active {
    transform: translateY(6px);
    box-shadow: 0 0 0 #1565C0;
}

/* Animations */
@keyframes pop {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.2);
    }

    100% {
        transform: scale(1);
    }
}

.correct-anim {
    animation: pop 0.4s ease-in-out;
}

@keyframes shake {
    0% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px);
    }

    50% {
        transform: translateX(10px);
    }

    75% {
        transform: translateX(-10px);
    }

    100% {
        transform: translateX(0);
    }
}

.wrong-anim {
    animation: shake 0.4s ease-in-out;
    border-color: #ff3333 !important;
    background-color: #ffe6e6 !important;
}

#feedback-area {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 6rem;
    font-weight: bold;
    opacity: 0;
    pointer-events: none;
    z-index: 10;
}

.feedback-correct {
    color: #4CAF50;
    text-shadow: 2px 2px 0px #fff, 4px 4px 0px rgba(0, 0, 0, 0.2);
    animation: fadeOutUp 1s forwards;
}

.feedback-wrong {
    color: #f44336;
    text-shadow: 2px 2px 0px #fff, 4px 4px 0px rgba(0, 0, 0, 0.2);
    animation: fadeOutUp 1s forwards;
}

@keyframes fadeOutUp {
    0% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(0.5);
    }

    20% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.2);
    }

    100% {
        opacity: 0;
        transform: translate(-50%, -100%) scale(1);
    }
}

/* Hide game parts initially */
#main-area,
#keyboard-area {
    display: none;
}