@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;700;900&display=swap');

:root {
    --primary-color: #2E7D32;
    /* Forest Green */
    --primary-light: #60ad5e;
    --primary-dark: #005005;
    --accent-color: #FF8F00;
    /* Amber */
    --bg-color: #121212;
    /* Dark theme default */
    --card-bg: #1E1E1E;
    --text-main: #F5F5F5;
    --text-muted: #BDBDBD;
    --correct-color: #4CAF50;
    --incorrect-color: #F44336;
    --transition: 0.3s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-image: radial-gradient(circle at top right, #1a3622 0%, var(--bg-color) 60%);
    overflow: hidden;
}

#app {
    width: 100%;
    max-width: 600px;
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    padding: 40px 30px;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.screen {
    display: none;
    flex-direction: column;
    align-items: center;
    text-align: center;
    animation: fadeIn 0.5s ease forwards;
}

.screen.active {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

/* タイトルとテキスト */
h1 {
    font-size: 2.2rem;
    font-weight: 900;
    margin-bottom: 20px;
    background: linear-gradient(45deg, var(--primary-light), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 30px;
    line-height: 1.4;
}

p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    line-height: 1.6;
}

/* ボタン */
.btn {
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: 700;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    transform: translateY(0);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

.btn:active {
    transform: translateY(1px);
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: #fff;
}

.secondary-btn {
    background: transparent;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
}

.secondary-btn:hover {
    background: rgba(255, 143, 0, 0.1);
}

/* プログレスバー */
.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    margin-bottom: 20px;
    overflow: hidden;
}

.progress {
    height: 100%;
    background: var(--primary-light);
    width: 0%;
    transition: width 0.4s ease;
}

.counter {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
    letter-spacing: 2px;
}

/* 選択肢ボタン */
.choices {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.choice-btn {
    width: 100%;
    padding: 18px 20px;
    font-size: 1.1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    position: relative;
    overflow: hidden;
}

.choice-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-light);
    transform: scale(1.02);
}

.choice-btn.disabled {
    pointer-events: none;
}

.choice-btn.correct {
    background: var(--correct-color);
    border-color: var(--correct-color);
    color: #fff;
}

.choice-btn.incorrect {
    background: var(--incorrect-color);
    border-color: var(--incorrect-color);
    color: #fff;
}

/* 結果画面 */
.score-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 8px solid var(--primary-color);
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 30px;
    box-shadow: 0 0 30px rgba(46, 125, 50, 0.3);
}

.score {
    font-size: 2.5rem;
    font-weight: 900;
    color: #fff;
    margin: 0;
}

.comment {
    font-size: 1.3rem;
    color: var(--accent-color);
    margin-bottom: 40px;
}

/* フィードバックアニメーション (〇✖) */
.feedback-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.4);
    z-index: 10;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s;
}

.feedback-overlay.show {
    visibility: visible;
    opacity: 1;
}

.feedback-icon {
    font-size: 180px;
    font-weight: bold;
    opacity: 0;
    transform: scale(0.5);
}

.feedback-overlay.show .feedback-icon {
    animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

.feedback-icon.maru {
    color: var(--correct-color);
    text-shadow: 0 0 20px rgba(76, 175, 80, 0.8);
}

.feedback-icon.maru::before {
    content: '〇';
}

.feedback-icon.batsu {
    color: var(--incorrect-color);
    text-shadow: 0 0 20px rgba(244, 67, 54, 0.8);
}

.feedback-icon.batsu::before {
    content: '✖';
}

@keyframes popIn {
    0% {
        opacity: 0;
        transform: scale(0.5);
    }

    70% {
        opacity: 1;
        transform: scale(1.1);
    }

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

/* 閉じるボタン */
.close-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    transition: var(--transition);
    z-index: 100;
}

.close-btn:hover {
    color: var(--incorrect-color);
    transform: scale(1.1);
}

/* レスポンシブ */
@media (max-width: 600px) {
    #app {
        border-radius: 0;
        min-height: 100vh;
        display: flex;
        flex-direction: column;
        justify-content: center;
        border: none;
    }
}