body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    max-width: 600px;
    margin: 20px auto;
    padding: 20px;
    background-color: #f9f9f9;
    color: #333;
    line-height: 1.6;
}

h1 {
    text-align: center;
    color: #4a7c59;
}

p {
    text-align: center;
    font-size: 0.9em;
    color: #555;
}

div.upload-container {
    text-align: center;
    margin: 30px 0;
    padding: 20px;
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

#imageInput {
    margin-bottom: 15px;
    width: 100%;
    max-width: 400px;
}

#uploadButton {
    display: block;
    width: 100%;
    max-width: 400px;
    margin: 10px auto;
    padding: 12px 20px;
    font-size: 1.1em;
    font-weight: bold;
    color: #ffffff;
    background-color: #007bff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#uploadButton:hover {
    background-color: #0056b3;
}

#loading {
    display: none;
    text-align: center;
    margin-top: 20px;
    color: #888;
    font-style: italic;
}

/* 結果表示エリア */
#result {
    margin-top: 25px;
    padding: 15px;
    font-size: 1.1em;
    font-weight: bold;
    text-align: center;
    background-color: #e9f5ff;
    border: 1px solid #bce8f1;
    border-radius: 5px;
    min-height: 50px;
    line-height: 1.5;
    opacity: 0;
    /* Default hidden for animation */
    transition: opacity 0.5s ease;
}

#result.show {
    opacity: 1;
}

/* Rank Animations */

/* Rank S: Godly/Rainbow Glow */
@keyframes rainbow-glow {
    0% {
        box-shadow: 0 0 10px #ff0000, 0 0 20px #ff0000;
        border-color: #ff0000;
        transform: scale(1);
    }

    20% {
        box-shadow: 0 0 10px #ff7f00, 0 0 20px #ff7f00;
        border-color: #ff7f00;
        transform: scale(1.05);
    }

    40% {
        box-shadow: 0 0 10px #ffff00, 0 0 20px #ffff00;
        border-color: #ffff00;
        transform: scale(1);
    }

    60% {
        box-shadow: 0 0 10px #00ff00, 0 0 20px #00ff00;
        border-color: #00ff00;
        transform: scale(1.05);
    }

    80% {
        box-shadow: 0 0 10px #0000ff, 0 0 20px #0000ff;
        border-color: #0000ff;
        transform: scale(1);
    }

    100% {
        box-shadow: 0 0 10px #8b00ff, 0 0 20px #8b00ff;
        border-color: #8b00ff;
        transform: scale(1.05);
    }
}

.rank-s {
    animation: rainbow-glow 2s infinite linear;
    background: linear-gradient(45deg, gold, #fff, gold);
    color: #d4af37;
    font-size: 1.5em !important;
}

/* Rank A: Shiny/Pulse Gold */
@keyframes gold-pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 215, 0, 0.7);
    }

    70% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(255, 215, 0, 0);
    }

    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 215, 0, 0);
    }
}

.rank-a {
    animation: gold-pulse 1.5s infinite;
    border-color: gold !important;
    background-color: #fffae6 !important;
    color: #b8860b !important;
}

/* Rank B: Happy Bounce */
@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(-20px);
    }

    60% {
        transform: translateY(-10px);
    }
}

.rank-b {
    animation: bounce 1s;
    border-color: #007bff !important;
    color: #007bff !important;
}

/* Rank C: Fade In / Gentle */
@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

.rank-c {
    animation: fade-in-up 1s ease-out;
    color: #555 !important;
}

/* Rank D: Shake / Sad */
@keyframes shake {
    0% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    50% {
        transform: translateX(5px);
    }

    75% {
        transform: translateX(-5px);
    }

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

.rank-d {
    animation: shake 0.5s;
    background-color: #f8d7da !important;
    border-color: #f5c6cb !important;
    color: #721c24 !important;
}

/* スコア表示用のスタイル */
#result span {
    font-size: 1.8em;
    color: #0056b3;
    display: block;
    margin-bottom: 5px;
}