/* 全局样式 */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: #ffffff;
    font-weight: 700;
    font-size: 2.5rem;
    text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

/* 卡片样式 */
.card {
    border: none;
    border-radius: 12px;
    background-color: #ffffff;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    margin-bottom: 24px;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.card-body {
    padding: 24px;
}

/* 表单样式 */
form {
    margin-bottom: 0;
}

.form-label {
    font-weight: 600;
    color: #495057;
    margin-bottom: 8px;
}

.form-control {
    border-radius: 8px;
    border: 1px solid #ced4da;
    background-color: #ffffff;
    color: #495057;
    padding: 10px 12px;
    font-size: 14px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    border-color: #28a745;
    box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
    background-color: #ffffff;
    color: #495057;
}

/* 按钮样式 */
.btn {
    border-radius: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.btn-success {
    background-color: #28a745;
    border-color: #28a745;
}

.btn-success:hover {
    background-color: #218838;
    border-color: #1e7e34;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.4);
}

.btn-secondary {
    background-color: #495057;
    border-color: #495057;
}

.btn-secondary:hover {
    background-color: #343a40;
    border-color: #343a40;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(108, 117, 125, 0.4);
}

/* 图表区域 */
#stockChart {
    width: 100% !important;
    height: auto !important;
    min-height: 300px;
    max-height: 400px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .card-body {
        padding: 16px;
    }
    
    .form-control {
        padding: 8px 10px;
    }
    
    .btn {
        padding: 8px 16px;
        font-size: 13px;
    }
    
    #stockChart {
        min-height: 300px;
    }
}

/* 加载动画 */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    min-height: 300px;
    font-size: 18px;
    color: #495057;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.95);
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border-left-color: #118DFF;
    animation: spin 1s linear infinite;
    margin-right: 12px;
}

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