/* ========== 會員註冊/登入頁面樣式 ========== */

/* 背景和容器 */
.auth-section {
    background: linear-gradient(135deg, #2D5B69 0%, #1a3d47 50%, #4CAF50 100%);
    background-size: 200% 200%;
    animation: gradientShift 15s ease infinite;
    min-height: 95vh;
    padding: 40px 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.auth-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(76, 175, 80, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(45, 91, 105, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.auth-container {
    background: white;
    border-radius: 24px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.15),
        0 0 0 1px rgba(255, 255, 255, 0.1);
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    overflow: hidden;
    animation: slideInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    z-index: 1;
}

/* 登入頁面專用樣式 */
.login-container {
    max-width: 800px;
    animation: bounceIn 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* 標題區域 */
.auth-header {
    background: linear-gradient(135deg, #2D5B69 0%, #4CAF50 100%);
    color: white;
    text-align: center;
    padding: 10px 30px 20px;
    position: relative;
    overflow: hidden;
}

.auth-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.auth-logo {
    width: 90px;
    height: auto;
    margin-bottom: 24px;
    filter: brightness(0) invert(1);
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
}

.auth-logo:hover {
    transform: scale(1.05);
}

.auth-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
    letter-spacing: -0.5px;
}

.auth-subtitle {
    font-size: 16px;
    opacity: 0.95;
    margin-bottom: 0;
    position: relative;
    z-index: 1;
    font-weight: 400;
}

/* 表單區域 */
.auth-form {
    padding: 50px 40px 15px;
}

/* 登入方式切換 */
.login-tabs {
    display: flex;
    background: #f0f4f7;
    border-radius: 12px;
    padding: 6px;
    margin-bottom: 15px;
    gap: 6px;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    color: #666;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    isolation: isolate;
}

.tab-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #4CAF50, #66BB6A);
    border-radius: 10px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.tab-btn.active {
    color: white !important;
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.tab-btn.active::before {
    opacity: 1;
    z-index: -1;
}

.tab-content.hidden {
    display: none;
}

/* 表單區塊 */
.form-section {
    margin-bottom: 40px;
    border-bottom: 1px solid #e8ecef;
    padding-bottom: 32px;
}

.form-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.section-title {
    font-size: 22px;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
    padding-bottom: 12px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, #4CAF50, #66BB6A);
    border-radius: 2px;
}

.optional {
    font-size: 14px;
    color: #95a5a6;
    font-weight: 400;
}

/* 表單行 */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 15px;
    position: relative;
}

.form-group label {
    display: flex;
    align-items: center;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 14px;
    transition: color 0.3s ease;
}

.form-group label i {
    margin-right: 10px;
    color: #4CAF50;
    width: 18px;
    text-align: center;
    font-size: 16px;
    transition: transform 0.3s ease;
}

.form-group:focus-within label i {
    transform: scale(1.1);
}

.required {
    color: #e74c3c;
    font-weight: 700;
    margin-left: 4px;
}

/* 表單輸入框 */
.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 2px solid #e1e8ed;
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: #fff;
    color: #2c3e50;
    box-sizing: border-box;
}

.form-control:hover {
    border-color: #bdc3c7;
}

.form-control:focus {
    outline: none;
    border-color: #4CAF50;
    box-shadow: 
        0 0 0 4px rgba(76, 175, 80, 0.1),
        0 4px 12px rgba(76, 175, 80, 0.15);
    transform: translateY(-1px);
}

.form-control::placeholder {
    color: #95a5a6;
    font-weight: 400;
}

.form-control:valid:not(:placeholder-shown) {
    border-color: #27ae60;
    background: #f0fdf4;
}

.form-control:invalid:not(:placeholder-shown):not(:focus) {
    border-color: #e74c3c;
    background: #fff5f5;
}

/* 密碼輸入框 */
.password-input {
    position: relative;
    display: flex;
    align-items: center;
}

.password-input .form-control {
    padding-right: 50px;
}

.password-toggle {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #7f8c8d;
    cursor: pointer;
    font-size: 18px;
    padding: 8px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.password-toggle:hover {
    color: #4CAF50;
    background: rgba(76, 175, 80, 0.1);
    transform: translateY(-50%) scale(1.1);
}

/* 驗證碼輸入 */
.verification-input {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.verification-input .form-control {
    flex: 1;
}

.send-code-btn {
    white-space: nowrap;
    padding: 14px 20px;
    font-size: 14px;
    border-radius: 12px;
    min-width: 120px;
}

/* 表單選項 */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
    flex-wrap: wrap;
    gap: 16px;
}

.forgot-password {
    color: #4CAF50;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
}

.forgot-password::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: #4CAF50;
    transition: width 0.3s ease;
}

.forgot-password:hover {
    color: #45A049;
}

.forgot-password:hover::after {
    width: 100%;
}

/* 錯誤狀態 */
.form-group.error .form-control {
    border-color: #e74c3c;
    background: #fff5f5;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

.error-message {
    color: #e74c3c;
    font-size: 13px;
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

.error-message::before {
    content: '⚠';
    font-size: 14px;
}

/* 表單提示文字 */
.form-text {
    font-size: 12px;
    color: #7f8c8d;
    margin-top: 8px;
    display: block;
    line-height: 1.5;
}

/* 密碼強度指示器 */
.password-strength {
    margin-top: 12px;
}

.strength-bar {
    width: 100%;
    height: 6px;
    background: #e1e8ed;
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 8px;
    position: relative;
}

.strength-progress {
    height: 100%;
    width: 0%;
    background: #ff4757;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 3px;
    position: relative;
    overflow: hidden;
}

.strength-progress::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.strength-text {
    font-size: 13px;
    color: #7f8c8d;
    font-weight: 500;
}

/* 自訂 Checkbox */
.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 18px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    font-size: 14px;
    line-height: 1.6;
    transition: color 0.3s ease;
}

.checkbox-label:hover {
    color: #2c3e50;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #bdc3c7;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    margin-top: 2px;
    background: white;
    position: relative;
}

.checkbox-label:hover .checkmark {
    border-color: #4CAF50;
    transform: scale(1.05);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: linear-gradient(135deg, #4CAF50, #66BB6A);
    border-color: #4CAF50;
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    color: white;
    font-size: 14px;
    font-weight: bold;
    animation: checkmarkPop 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes checkmarkPop {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* 連結樣式 */
.link {
    color: #4CAF50;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
}

.link:hover {
    color: #45A049;
    text-decoration: underline;
}

/* 按鈕樣式 */
.btn {
    padding: 12px 28px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, #4CAF50 0%, #66BB6A 100%);
    color: white;
    box-shadow: 
        0 4px 15px rgba(76, 175, 80, 0.3),
        0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #45A049 0%, #5CB85C 100%);
    box-shadow: 
        0 8px 25px rgba(76, 175, 80, 0.4),
        0 4px 8px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 
        0 2px 8px rgba(76, 175, 80, 0.3),
        0 1px 2px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
    background: #6c757d;
    color: white;
    box-shadow: 0 2px 8px rgba(108, 117, 125, 0.3);
}

.btn-secondary:hover {
    background: #5a6268;
    box-shadow: 0 4px 12px rgba(108, 117, 125, 0.4);
    transform: translateY(-2px);
}

.btn-outline-primary {
    background: transparent;
    color: #4CAF50;
    border: 2px solid #4CAF50;
    box-shadow: none;
}

.btn-outline-primary:hover {
    background: #4CAF50;
    color: white;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
    transform: translateY(-2px);
}

.btn-outline-secondary {
    background: transparent;
    color: #6c757d;
    border: 2px solid #6c757d;
    box-shadow: none;
}

.btn-outline-secondary:hover {
    background: #6c757d;
    color: white;
    box-shadow: 0 4px 15px rgba(108, 117, 125, 0.3);
    transform: translateY(-2px);
}

.btn-register,
.btn-login {
    width: 100%;
    padding: 16px;
    font-size: 18px;
    margin-bottom: 0px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

/* 表單操作區域 */
.form-actions {
    text-align: center;
    margin-top: 10px;
}

.auth-links {
    margin-top: 5px;
}

.auth-links p {
    color: #7f8c8d;
    margin: 0;
    font-size: 15px;
}

/* 社群登入 */
.social-login {
    padding: 36px 40px;
    background: linear-gradient(to bottom, #f8f9fa, #ffffff);
    text-align: center;
    border-top: 1px solid #e8ecef;
}

.divider {
    position: relative;
    margin: -18px 0 5px;
    text-align: center;
}

.divider span {
    background: linear-gradient(to bottom, #f8f9fa, #ffffff);
    padding: 0 20px;
    color: #7f8c8d;
    font-size: 14px;
    position: relative;
    z-index: 1;
    font-weight: 500;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, #e1e8ed, transparent);
}

.social-buttons {
    display: flex;
    gap: 5px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-social {
    flex: 1;
    min-width: 140px;
    background: white;
    color: #2c3e50;
    border: 2px solid #e1e8ed;
    font-size: 15px;
    padding: 10px 20px;
    transition: all 0.3s ease;
    font-weight: 600;
}

.btn-social i {
    font-size: 18px;
    margin-right: 8px;
}

.btn-social:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-google:hover {
    border-color: #db4437;
    color: #db4437;
    background: #fff5f5;
}

.btn-facebook:hover {
    border-color: #3b5998;
    color: #3b5998;
    background: #f0f4ff;
}

.btn-line:hover {
    border-color: #00c300;
    color: #00c300;
    background: #f0fff0;
}

/* 警告/成功訊息 */
.alert {
    padding: 16px 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    font-size: 14px;
    position: relative;
    animation: slideDown 0.4s ease;
    border-left: 4px solid;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.alert::before {
    font-size: 18px;
    flex-shrink: 0;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-danger {
    background: #fff5f5;
    color: #c0392b;
    border-left-color: #e74c3c;
}

/* 只有在沒有內部圖標時才顯示 ::before 圖標 */
.alert-danger:not(:has(i))::before {
    content: '⚠';
}

.alert-success {
    background: #f0fdf4;
    color: #27ae60;
    border-left-color: #27ae60;
}

/* 只有在沒有內部圖標時才顯示 ::before 圖標 */
.alert-success:not(:has(i))::before {
    content: '✓';
}

.alert-info {
    background: #f0f9ff;
    color: #1976d2;
    border-left-color: #1976d2;
}

/* 只有在沒有內部圖標時才顯示 ::before 圖標 */
.alert-info:not(:has(i))::before {
    content: 'ℹ';
}

.alert p {
    margin: 0;
}

.btn-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: inherit;
    opacity: 0.6;
    padding: 4px;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.btn-close:hover {
    opacity: 1;
    background: rgba(0, 0, 0, 0.05);
}

/* Modal 樣式 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-dialog {
    max-width: 500px;
    width: 90%;
    animation: modalSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-content {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

.modal-header {
    padding: 24px 28px 0;
    border-bottom: 1px solid #e8ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 22px;
    font-weight: 700;
    color: #2c3e50;
    margin: 0;
}

.modal-body {
    padding: 24px 28px;
}

.modal-footer {
    padding: 0 28px 24px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* 動畫 */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.8) translateY(30px);
    }
    60% {
        opacity: 1;
        transform: scale(1.05) translateY(-10px);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
}
}

/* Loading 狀態 */
.btn.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 特殊效果 */
.form-group:focus-within label {
    color: #4CAF50;
    }

/* 響應式設計 */
@media (max-width: 768px) {
.auth-section {
        padding: 20px 15px;
}

.auth-container {
        margin: 0;
    border-radius: 20px;
}

.auth-header {
        padding: 10px 24px 20px;
}

.auth-title {
        font-size: 28px;
}

.auth-subtitle {
        font-size: 15px;
}

.auth-form {
        padding: 36px 24px 16px;
}

.form-row {
        grid-template-columns: 1fr;
        gap: 0;
}

    .form-options {
        flex-direction: column;
    align-items: flex-start;
    gap: 12px;
}

    .verification-input {
        flex-direction: column;
        gap: 12px;
    }
    
    .send-code-btn {
    width: 100%;
}

.social-login {
        padding: 28px 24px;
}

.social-buttons {
        flex-direction: column;
}

.btn-social {
        min-width: auto;
        width: 100%;
}

    .login-tabs {
        margin-bottom: 15px;
}

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

@media (max-width: 480px) {
    .auth-container {
        border-radius: 16px;
    }
    
    .auth-header {
        padding: 8px 15px 15px;
    }
    
    .auth-logo {
        width: 70px;
        margin-bottom: 3px;
    }
    
    .auth-title {
        font-size: 24px;
    }
    
    .auth-subtitle {
        font-size: 14px;
    }
    
    .auth-form {
        padding: 28px 20px 3px;
    }
    
    .form-section {
        margin-bottom: 32px;
        padding-bottom: 24px;
    }
    
    .section-title {
        font-size: 18px;
        margin-bottom: 20px;
}

    .social-login {
        padding: 24px 20px;
}

    .modal-dialog {
        width: 95%;
        margin: 10px;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding-left: 20px;
        padding-right: 20px;
    }
    
    .btn-register,
    .btn-login {
        padding: 10px;
        font-size: 16px;
}
}

/* 深色模式支持（可選） */
@media (prefers-color-scheme: dark) {
    /* 這裡可以添加深色模式樣式 */
}