/* 全域樣式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Microsoft YaHei", 
                 "微軟正黑體", "Segoe UI", sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 500px;
    margin: 0 auto;
    min-height: 100vh;
    background-color: white;
}

/* 頁面通用樣式 */
.page {
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.page-header {
    margin-bottom: 30px;
}

.page-title {
    font-size: 24px;
    font-weight: bold;
    color: #3B6E98;
    text-align: center;
    margin-bottom: 15px;
}

.page-title.warning {
    color: #FF9800;
}

.divider {
    width: 80px;
    height: 3px;
    background-color: #3B6E98;
    margin: 0 auto;
}

.page-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Loading 動畫 */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    min-height: 300px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3B6E98;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    font-size: 18px;
    color: #666;
    font-weight: 500;
}

.loading-subtext {
    font-size: 14px;
    color: #999;
}

/* 輸入框樣式 */
.input-field {
    width: 100%;
    padding: 15px;
    font-size: 16px;
    border: 2px solid #3B6E98;
    border-radius: 8px;
    outline: none;
    transition: border-color 0.3s;
    font-family: inherit;
    resize: none;
}

.input-field:focus {
    border-color: #2a5474;
}

.input-field::placeholder {
    color: #999;
}

/* 字數計數器 */
.char-counter {
    text-align: right;
    color: #666;
    font-size: 14px;
    margin-top: -10px;
}

/* 說明文字 */
.instruction-text {
    color: #666;
    font-size: 15px;
    text-align: center;
    line-height: 1.8;
}

.example-text {
    color: #999;
    font-size: 13px;
}

.info-text {
    color: #666;
    font-size: 15px;
    text-align: center;
    margin-bottom: 20px;
}

/* 驗證訊息 */
.validation-message {
    font-size: 14px;
    min-height: 20px;
    padding: 5px 10px;
}

.validation-message.success {
    color: #4CAF50;
}

.validation-message.error {
    color: #f44336;
}

/* 參考圖片 */
.reference-image-container {
    text-align: center;
    margin-top: 20px;
}

.reference-label {
    font-size: 14px;
    color: #666;
    margin-bottom: 10px;
}

.reference-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* 按鈕樣式 */
.btn {
    padding: 15px 30px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    outline: none;
    width: 100%;
}

.btn-primary {
    background-color: #3B6E98;
    color: white;
}

.btn-primary:hover {
    background-color: #2a5474;
}

.btn-primary:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: #999;
    color: white;
}

.btn-secondary:hover {
    background-color: #777;
}

/* 按鈕組 */
.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

/* 棋子容器 */
.pieces-container {
    position: relative;
    width: 100%;
    max-width: 350px;
    height: 350px;
    margin: 20px auto;
}

.piece {
    position: absolute;
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background-color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    font-weight: bold;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.piece.red {
    border: 3px solid #FF0000;
    color: #FF0000;
}

.piece.black {
    border: 3px solid #000000;
    color: #000000;
}

/* 棋子位置 - 十字排列 */
.piece-center {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.piece-left {
    top: 50%;
    left: 15%;
    transform: translate(-50%, -50%);
}

.piece-right {
    top: 50%;
    left: 85%;
    transform: translate(-50%, -50%);
}

.piece-top {
    top: 20%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.piece-bottom {
    top: 80%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* 問題顯示 */
.result-question {
    background-color: #f5f5f5;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.question-label {
    font-size: 14px;
    color: #666;
    margin-bottom: 10px;
}

.question-text {
    font-size: 16px;
    color: #333;
    font-weight: 500;
    word-wrap: break-word;
}

.result-notice {
    text-align: center;
    color: #666;
    font-size: 15px;
    margin: 10px 0;
}

/* 錯誤頁面 */
.error-content {
    text-align: center;
    justify-content: center;
}

.error-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.error-title {
    font-size: 24px;
    color: #f44336;
    margin-bottom: 15px;
}

.error-text {
    font-size: 16px;
    color: #666;
    margin-bottom: 30px;
    line-height: 1.8;
}

/* 響應式設計 */
@media (max-width: 400px) {
    .page {
        padding: 15px;
    }

    .page-title {
        font-size: 20px;
    }

    .pieces-container {
        max-width: 300px;
        height: 300px;
    }

    .piece {
        width: 60px;
        height: 60px;
        font-size: 30px;
    }
}

/* 隱藏類別 */
.hidden {
    display: none !important;
}

/* 動畫效果 */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}