/* 全局样式 */
:root {
    --primary-color: #4a90e2;
    --secondary-color: #2c3e50;
    --background-color: #f5f6fa;
    --text-color: #2c3e50;
    --border-color: #dcdde1;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

/* 头部样式 */
header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--secondary-color);
    font-size: 1.1rem;
    opacity: 0.8;
}

/* 输入区域样式 */
.input-section {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

input[type="text"] {
    flex: 1;
    padding: 1rem;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    transition: border-color 0.3s ease;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

button {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    color: white;
    background-color: var(--primary-color);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #357abd;
}

button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

/* 结果区域样式 */
.result-section {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px var(--shadow-color);
    min-height: 200px;
}

/* 加载动画 */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Markdown 样式 */
.markdown-body {
    font-size: 1rem;
    line-height: 1.8;
}

.markdown-body h1 { font-size: 2rem; margin: 1.5rem 0 1rem; }
.markdown-body h2 { font-size: 1.75rem; margin: 1.4rem 0 0.9rem; }
.markdown-body h3 { font-size: 1.5rem; margin: 1.3rem 0 0.8rem; }
.markdown-body h4 { font-size: 1.25rem; margin: 1.2rem 0 0.7rem; }

.markdown-body p {
    margin-bottom: 1rem;
}

.markdown-body ul, .markdown-body ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.markdown-body li {
    margin-bottom: 0.5rem;
}

.markdown-body code {
    background-color: #f8f9fa;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: monospace;
}

.markdown-body hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

/* 错误提示样式 */
.error {
    color: #e74c3c;
    padding: 1rem;
    background-color: #fdf0ed;
    border-radius: 8px;
    border-left: 4px solid #e74c3c;
}

/* 页脚样式 */
footer {
    margin-top: 3rem;
    text-align: center;
    color: var(--secondary-color);
    opacity: 0.7;
    font-size: 0.9rem;
}

/* 频率说明样式 */
.frequency-legend {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow-color);
    margin-bottom: 2rem;
}

.frequency-legend h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.frequency-items {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.frequency-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
}

.frequency-dot {
    font-size: 1.2rem;
    line-height: 1;
}

.copyright {
    opacity: 0.7;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .input-section {
        flex-direction: column;
    }

    button {
        width: 100%;
    }

    .frequency-items {
        gap: 0.6rem;
    }

    .frequency-item {
        font-size: 0.9rem;
    }
}