/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf9 100%);
    min-height: 100vh;
    padding: 20px;
}
.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* 头部 */
header {
    text-align: center;
    padding: 30px 20px;
    background: linear-gradient(120deg, #e74c3c 0%, #c0392b 100%);
    color: white;
}
header h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
header p {
    opacity: 0.9;
    font-size: 1.1rem;
}

/* 标签页 */
.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 20px;
    justify-content: center;
    background: #f8f9fa;
    border-bottom: 1px solid #eee;
}
.tab-btn {
    padding: 10px 20px;
    border: none;
    background: #e9ecef;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    color: #495057;
}
.tab-btn.active,
.tab-btn:hover {
    background: #e74c3c;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(231, 76, 60, 0.3);
}

/* 表单 */
.forms-container {
    padding: 25px;
    min-height: 300px;
}
.form-section {
    display: none;
}
.form-section.active {
    display: block;
    animation: fadeIn 0.5s ease;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.form-group {
    margin-bottom: 22px;
}
.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #2c3e50;
    font-size: 1.05rem;
}
.form-group input,
.form-group select {
    width: 100%;
    padding: 14px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
    background: #fafafa;
}
.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #e74c3c;
    background: white;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}
.btn-submit {
    width: 100%;
    padding: 16px;
    background: linear-gradient(120deg, #e74c3c 0%, #c0392b 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(231, 76, 60, 0.4);
}
.btn-submit:active {
    transform: translateY(0);
}

/* 结果区域 */
.result-container {
    padding: 0 25px 30px;
}
.loading {
    text-align: center;
    padding: 40px 20px;
}
.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #e74c3c;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Markdown渲染样式 */
.markdown-body {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    border: 1px solid #eee;
    font-size: 16px;
    line-height: 1.8;
}
.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
    color: #e74c3c;
    margin: 25px 0 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}
.markdown-body p {
    margin: 15px 0;
    text-align: justify;
}
.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 15px;
}
.markdown-body th,
.markdown-body td {
    border: 1px solid #ddd;
    padding: 14px 12px;
    text-align: center;
}
.markdown-body th {
    background-color: #f8f9fa;
    font-weight: bold;
    color: #2c3e50;
}
.markdown-body ul,
.markdown-body ol {
    padding-left: 25px;
    margin: 15px 0;
}
.markdown-body li {
    margin: 8px 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        border-radius: 0;
        box-shadow: none;
        margin: 0;
        min-height: 100vh;
    }
    header h1 {
        font-size: 1.8rem;
    }
    .tabs {
        padding: 15px 10px;
    }
    .tab-btn {
        padding: 8px 16px;
        font-size: 14px;
    }
    .forms-container,
    .result-container {
        padding: 20px 15px;
    }
    .form-group input,
    .form-group select {
        padding: 12px;
        font-size: 16px;
    }
    .btn-submit {
        padding: 14px;
        font-size: 16px;
    }
    .markdown-body {
        padding: 20px 15px;
        font-size: 15px;
    }
    .markdown-body th,
    .markdown-body td {
        padding: 10px 8px;
    }
}