:root {
    --primary-color: #4a6cf7;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --body-bg: #f5f7fa;
    --card-bg: #ffffff;
    --border-color: #e9ecef;
    --text-color: #495057;
    --text-muted: #6c757d;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--body-bg);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

/* 登入/註冊框 */
.login-box, .register-box, .payment-box, .payment-complete-box {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 450px;
}

.login-box h2, .register-box h2 {
    margin-bottom: 30px;
    text-align: center;
    color: var(--primary-color);
}

/* 表單樣式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.1);
}

.form-text {
    display: block;
    margin-top: 5px;
    font-size: 12px;
    color: var(--text-muted);
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.checkbox input {
    width: auto;
}

/* 按鈕 */
.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: #3a5ce5;
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-secondary:hover {
    background: #5a6268;
}

/* 錢包地址顯示 */
.wallet-info {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

.wallet-address {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 15px 0;
}

.wallet-address code {
    flex: 1;
    background: #e9ecef;
    padding: 10px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 14px;
    word-break: break-all;
}

.wallet-address button {
    padding: 8px 16px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

.note {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 10px;
}

/* 訂單摘要 */
.summary-box {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.summary-box h4 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.summary-box p {
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
}

/* 警告訊息 */
.alert {
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert.error {
    background: #fee;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.alert.success {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.alert.info {
    background: #d1ecf1;
    border: 1px solid #bee5eb;
    color: #0c5460;
}

/* 會員儀表板 */
.dashboard-container {
    min-height: 100vh;
}

.dashboard-header {
    background: var(--card-bg);
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.dashboard-content {
    padding: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.08);
}

.stat-card h3 {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

.progress-bar {
    height: 6px;
    background: #e9ecef;
    border-radius: 3px;
    margin-top: 15px;
    overflow: hidden;
}

.progress {
    height: 100%;
    background: var(--success-color);
    transition: width 0.3s;
}

.dashboard-section {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.08);
}

.dashboard-section h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

/* 表格 */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: #f8f9fa;
    font-weight: 600;
    color: var(--text-color);
}

.data-table tr:hover {
    background: #f8f9fa;
}

/* 推薦連結 */
.referral-link {
    display: flex;
    gap: 10px;
}

.referral-link input {
    flex: 1;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: monospace;
}

/* 響應式 */
@media (max-width: 768px) {
    .login-box, .register-box, .payment-box, .payment-complete-box {
        padding: 25px;
        margin: 10px;
    }
    
    .stats-cards {
        grid-template-columns: 1fr;
    }
    
    .wallet-address {
        flex-direction: column;
        align-items: stretch;
    }
    
    .referral-link {
        flex-direction: column;
    }
}

/* 動畫 */
@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.6; }
    100% { opacity: 1; }
}