/* ============================================
   帮助与反馈页面
   ============================================ */

.help-page { padding: 30px 0 60px; }
.help-container { max-width: 760px; margin: 0 auto; }

/* 页面标题 */
.help-page-title {
    font-size: 1.5rem; font-weight: 700; margin-bottom: 8px;
}

.help-page-subtitle {
    font-size: 0.9rem; color: var(--text-muted); margin-bottom: 28px;
}

/* 标签切换 */
.help-tabs {
    display: flex; gap: 6px; margin-bottom: 24px;
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); padding: 4px; width: fit-content;
}

.help-tab-btn {
    padding: 10px 24px; background: transparent; border: none;
    border-radius: var(--radius-md); color: var(--text-secondary);
    font-size: 0.88rem; font-weight: 500; cursor: pointer;
    transition: all var(--transition); font-family: var(--font-family);
}

.help-tab-btn:hover { color: #fff; }
.help-tab-btn.active { background: var(--color-primary); color: #fff; }

/* 二级分类标签 */
.help-subtabs {
    display: flex; gap: 6px; margin-bottom: 20px; flex-wrap: wrap;
}

.help-subtab-btn {
    padding: 7px 18px; background: var(--bg-card);
    border: 1px solid var(--border-color); border-radius: var(--radius-full);
    color: var(--text-secondary); font-size: 0.82rem; cursor: pointer;
    transition: all var(--transition); font-family: var(--font-family);
}

.help-subtab-btn:hover { border-color: rgba(79,110,246,0.3); color: #fff; }
.help-subtab-btn.active { background: rgba(79,110,246,0.1); border-color: var(--color-primary); color: var(--color-primary-light); }

.help-tab-content { display: none; }
.help-tab-content.active { display: block; }
.help-sub-content { display: none; }
.help-sub-content.active { display: block; }

/* 问答列表 */
.help-faq-list { display: flex; flex-direction: column; gap: 8px; }

.help-faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

.help-faq-item:hover { border-color: rgba(255,255,255,0.08); }

.help-faq-q {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 20px; cursor: pointer;
    font-size: 0.9rem; font-weight: 500;
    transition: all var(--transition);
    user-select: none;
    gap: 12px;
}

.help-faq-q:hover { background: rgba(255,255,255,0.015); }

.help-faq-q-icon {
    font-size: 0.7rem; color: var(--text-muted);
    transition: transform 0.2s;
    flex-shrink: 0;
}

.help-faq-item.open .help-faq-q-icon { transform: rotate(180deg); }

.help-faq-a {
    display: none; padding: 0 20px 18px;
    font-size: 0.84rem; color: var(--text-secondary);
    line-height: 1.8;
}

.help-faq-item.open .help-faq-a { display: block; }

.help-faq-a a { color: var(--color-primary-light); text-decoration: none; }
.help-faq-a a:hover { text-decoration: underline; }

/* 教程卡片 */
.help-guide-grid {
    display: grid; gap: 14px;
}

.help-guide-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex; gap: 16px;
    transition: all var(--transition);
    cursor: pointer;
}

.help-guide-card:hover {
    border-color: rgba(79,110,246,0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.help-guide-icon {
    font-size: 2rem; flex-shrink: 0;
    width: 56px; height: 56px; border-radius: 14px;
    background: rgba(79,110,246,0.08);
    display: flex; align-items: center; justify-content: center;
}

.help-guide-info { flex: 1; }

.help-guide-title {
    font-size: 0.92rem; font-weight: 600; margin-bottom: 6px;
}

.help-guide-desc {
    font-size: 0.8rem; color: var(--text-muted);
    line-height: 1.6; margin-bottom: 8px;
}

.help-guide-steps { list-style: none; padding: 0; }

.help-guide-steps li {
    font-size: 0.78rem; color: var(--text-secondary);
    padding: 3px 0; display: flex; align-items: center; gap: 8px;
}

.help-guide-step-num {
    width: 20px; height: 20px; border-radius: 50%;
    background: var(--color-primary); font-size: 0.65rem; color: #fff;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}

/* 视频教程 */
.help-video-grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px;
}

.help-video-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
    cursor: pointer;
}

.help-video-card:hover {
    border-color: rgba(79,110,246,0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.help-video-thumb {
    aspect-ratio: 16/10;
    background: var(--gradient-card);
    display: flex; align-items: center; justify-content: center;
    font-size: 2.5rem;
    position: relative;
}

.help-video-play {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0,0,0,0.3);
    opacity: 0; transition: opacity var(--transition);
}

.help-video-play span {
    width: 50px; height: 50px; border-radius: 50%;
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem;
}

.help-video-card:hover .help-video-play { opacity: 1; }
.help-video-body { padding: 14px; }
.help-video-title { font-size: 0.86rem; font-weight: 500; margin-bottom: 4px; }
.help-video-duration { font-size: 0.72rem; color: var(--text-muted); }

/* 响应式 */
@media (max-width: 768px) {
    .help-video-grid { grid-template-columns: 1fr; }
    .help-tabs { width: 100%; }
    .help-tab-btn { flex: 1; text-align: center; }
}