body {
    margin: 0;
    font-family: 'Segoe UI', 'Noto Sans JP', Arial, sans-serif;
    background: #f7f7fa;
    color: #222;
}
select {
    font-size: 16px;
}
h1 {
    text-align: center;
    font-size: 30px;
    margin-bottom: 20px;
}
.container {
    max-width: 480px;
    margin: 20px auto;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 16px #0001;
    padding: 24px;
}
.game-flex {
    display: flex;
}
.options-col {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.kanji-btn {
    width: 60px;
    height: 80px;
    font-size: 36px;
    padding-left: 0.25em;
    background: #f0f0f7;
    border: 2px solid #e0e0ef;
    border-radius: 8px;
}
.kanji-btn.selected {
    background: #dbeafe;
    border-color: #2563eb;
}
.kanji-btn.correct {
    background: #bbf7d0;
    border-color: #22c55e;
}
.kanji-btn.incorrect {
    background: #fecaca;
    border-color: #ef4444;
}
.hint-btn {
    font-size: 16px;
    padding: 14px 16px;
    background: none;
    border: none;
    vertical-align: top;
    margin-top: 15px;
}
.translation-center {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}
#config {
    text-align: center;
    margin-bottom: 20px;
}
#reading {
    height: 25px;
    text-align: center;
    font-size: 20px;
    margin-top: 40px;
    color:#222;
}
#word {
    display: block;
    height: 65px;
    font-size: 55px;
    color: #222;
    text-decoration: none;
    font-weight: bold;
}
#translation {
    height: 80px;
    text-align: center;
    font-size: 20px;
    max-width: 200px;
    margin-top: 30px;
    color: #444;
}
#next {
    margin: 20px auto 0 auto;
    padding: 20px 40px;
    font-size: 20px;
    height: 60px;
    background: #2563eb;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.15s;
}
#hint {
    height: 1em;
    text-align: center;
    font-size: 14px;
    line-height: 24px;
    margin-top: 20px;
    color:#666;
}