/* 自定义样式 */
body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.card-header {
    border-radius: 15px 15px 0 0 !important;
    background: linear-gradient(45deg, #4285f4, #34a853) !important;
    padding: 20px;
}

.card-header h2 {
    margin: 0;
    font-weight: 300;
}

.card-body {
    padding: 30px;
}

.form-label {
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
}

.form-control, .form-select {
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    padding: 12px 15px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: #4285f4;
    box-shadow: 0 0 0 0.2rem rgba(66, 133, 244, 0.25);
}

.btn {
    border-radius: 25px;
    padding: 12px 30px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(45deg, #4285f4, #34a853);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(45deg, #3367d6, #2d8f47);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: #6c757d;
    border: none;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.alert {
    border-radius: 10px;
    border: none;
    padding: 20px;
    font-size: 16px;
    line-height: 1.6;
}

.alert-success {
    background: linear-gradient(45deg, #d4edda, #c3e6cb);
    color: #155724;
}

.alert-danger {
    background: linear-gradient(45deg, #f8d7da, #f5c6cb);
    color: #721c24;
}

.spinner-border {
    width: 3rem;
    height: 3rem;
}

#resultSection {
    animation: fadeIn 0.5s ease-in;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .card-body {
        padding: 20px;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 10px;
    }
}

/* 文本区域自适应高度 */
#sourceText {
    resize: vertical;
    min-height: 100px;
}

/* 语言选择器样式 */
.form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m1 6 7 7 7-7'/%3e%3c/svg%3e");
}

/* 加载动画 */
.loading-text {
    color: #6c757d;
    font-style: italic;
}