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

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    height: 100vh;
    background-color: #f0f4f1;
    overflow: hidden;
}

.screen {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.hidden {
    display: none !important;
}

/* ステージ選択画面 */
#stage-select-screen {
    justify-content: center;
    align-items: center;
    background-color: #e2ede4;
    gap: 20px;
}

#stage-select-screen h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 2px;
}

#stage-select-screen p {
    color: #7f8c8d;
    font-size: 1rem;
    margin-bottom: 15px;
    font-style: italic;
}

#stage-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 700px;
}

/* ステージ選択のカード型ボタン */
.btn-stage {
    padding: 20px;
    background-color: #34495e;
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    width: 160px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.btn-stage:hover {
    background-color: #2c3e50;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.stage-title {
    font-size: 1.2rem;
    font-weight: bold;
}

.stage-stars {
    font-size: 1.1rem;
    letter-spacing: 2px;
    color: #f1c40f; /* 星を金色っぽく */
}

/* 上半分：選択用単語エリア */
#word-pool {
    flex: 1;
    background-color: #e2ede4;
    padding: 20px;
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 10px;
    border-bottom: 3px solid #adc3b2;
    overflow-y: auto;
}

/* 下半分：作成エリア・コントロール */
#editor-zone {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    background-color: #ffffff;
}

#sentence-preview {
    flex: 1;
    border: 2px dashed #adc3b2;
    border-radius: 8px;
    padding: 15px;
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 10px;
    background-color: #fafafa;
    overflow-y: auto;
    font-size: 1.2rem;
}

/* コントロールエリア */
.controls {
    margin-top: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#system-message {
    color: #7f8c8d;
    font-size: 0.9rem;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
}

.btn-submit { background-color: #2ecc71; color: white; }
.btn-clear { background-color: #e74c3c; color: white; }
.btn-back { background-color: #7f8c8d; color: white; padding: 5px 10px; font-size: 0.8rem; }

/* 単語チップ */
.word-chip {
    padding: 8px 15px;
    background-color: white;
    border: 1px solid #ccc;
    border-radius: 20px;
    cursor: pointer;
    user-select: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: all 0.2s;
}

.word-chip:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.word-chip.joshi {
    background-color: #ffeaa7;
    border-color: #fdcb6e;
}

/* ステータス表示 */
#status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #2c3e50;
    color: white;
    padding: 10px 20px;
    font-weight: bold;
}