/**
 * 工具页 - SEO 内容区块统一样式
 * 用于 audio-cutter / hum-to-midi / json-visualizer / math-problems / (index)
 *
 * v2 (2026-07-23): 换为 <details> 折叠式
 *   - 默认折叠，不干扰工具使用
 *   - HTML 内容仍存在，百度/谷歌蜘蛛仍可抓取 SEO 长尾词
 *   - 用户主动点开才看内容
 */

.tool-content {
    max-width: 900px;
    margin: 40px auto 20px;
    padding: 0 20px;
    color: #b4bcc8;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.75;
    font-size: 14px;
}

/* details/summary 折叠头 */
.tool-content > summary,
.tool-content-summary {
    cursor: pointer;
    padding: 12px 18px;
    background: rgba(0, 210, 255, 0.06);
    border: 1px solid rgba(0, 210, 255, 0.15);
    border-radius: 8px;
    color: #00d2ff;
    font-size: 14px;
    font-weight: 500;
    list-style: none;
    user-select: none;
    transition: background 0.2s;
}

.tool-content > summary::-webkit-details-marker,
.tool-content-summary::-webkit-details-marker { display: none; }

.tool-content > summary::before,
.tool-content-summary::before {
    content: '▶';
    display: inline-block;
    margin-right: 8px;
    font-size: 10px;
    transition: transform 0.2s;
    color: #00d2ff;
}

details.tool-content[open] > summary::before,
details[open] > .tool-content-summary::before {
    transform: rotate(90deg);
}

.tool-content > summary:hover,
.tool-content-summary:hover {
    background: rgba(0, 210, 255, 0.10);
}

/* 折叠内容区 */
.tool-content-body {
    padding: 16px 4px;
    animation: toolContentFadeIn 0.25s ease;
}

@keyframes toolContentFadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.tool-content h2 {
    color: #00d2ff;
    font-size: 18px;
    margin: 28px 0 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(0, 210, 255, 0.15);
}

.tool-content h3 {
    color: #e4e6eb;
    font-size: 15px;
    margin: 18px 0 8px;
}

.tool-content p {
    margin: 8px 0;
}

.tool-content ul, .tool-content ol {
    padding-left: 24px;
    margin: 8px 0;
}

.tool-content ul li,
.tool-content ol li {
    margin: 6px 0;
}

.tool-content .faq-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 8px;
    padding: 14px 18px;
    margin: 10px 0;
}

.tool-content .faq-q {
    color: #00d2ff;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 6px;
}

.tool-content .faq-a {
    color: #b4bcc8;
    font-size: 13px;
    line-height: 1.7;
}

.tool-content .highlight {
    color: #00d2ff;
}

.tool-content code {
    background: rgba(0, 210, 255, 0.08);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 12px;
    color: #00d2ff;
}

.related-tools {
    max-width: 900px;
    margin: 30px auto;
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.related-tools h2 {
    color: #00d2ff;
    font-size: 16px;
    margin-bottom: 16px;
    text-align: center;
}

.related-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
}

.related-tools-grid a {
    display: block;
    padding: 12px 14px;
    background: rgba(0, 210, 255, 0.05);
    border: 1px solid rgba(0, 210, 255, 0.12);
    border-radius: 8px;
    text-decoration: none;
    color: #e4e6eb;
    transition: all 0.2s;
}

.related-tools-grid a:hover {
    background: rgba(0, 210, 255, 0.12);
    border-color: rgba(0, 210, 255, 0.3);
    transform: translateY(-2px);
}

.related-tools-grid .emoji {
    font-size: 20px;
    margin-bottom: 6px;
}

.related-tools-grid .name {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 3px;
}

.related-tools-grid .desc {
    font-size: 11px;
    color: #888;
    line-height: 1.5;
}