/* ==================== 功能详解模块 ==================== */
.feature-detail {
    padding: 80px 0;
    background: var(--bg-white);
}

.feature-detail .section-title {
    text-align: center;
    font-size: 28px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 50px;
}

.feature-detail-wrapper {
    display: flex;
    gap: 40px;
    align-items: stretch;
    min-height: 420px;
}

/* 左侧Tab */
.feature-tabs {
    width: 200px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-light);
    border-radius: 12px;
    overflow: hidden;
}

.feature-tab {
    padding: 24px 20px;
    font-size: 15px;
    color: var(--text-gray);
    cursor: pointer;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.feature-tab:hover {
    background: white;
    color: var(--text-dark);
}

.feature-tab.active {
    background: white;
    color: var(--primary);
    border-left-color: var(--primary);
    font-weight: 600;
}

/* 右侧内容 */
.feature-tab-content {
    flex: 1;
    position: relative;
    border-radius: 12px;
    overflow: hidden;
}

.feature-panel {
    display: none;
    color: white;
    height: 100%;
}

.feature-panel.active {
    display: flex;
    flex-direction: column;
}

.feature-panel-header {
    text-align: center;
    padding: 24px 24px 12px;
}

.feature-panel-header h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-panel-header h3 em {
    color: #ffd700;
    font-style: normal;
}

.feature-panel-header p {
    font-size: 14px;
    opacity: 0.9;
}

.feature-panel-img {
    flex: 1;
    width: 100%;
    object-fit: cover;
}

.feature-panel-desc {
    font-size: 14px;
    opacity: 0.85;
    text-align: center;
    padding: 12px 24px;
}

/* ==================== 数据统计模块 ==================== */
.stats-section {
    padding: 60px 0;
    background: var(--bg-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item {
    padding: 20px;
}

.stat-number {
    margin-bottom: 12px;
}

.stat-num {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
}

.stat-unit {
    font-size: 18px;
    color: var(--primary);
    font-weight: 400;
}

.stat-label {
    font-size: 14px;
    color: var(--text-gray);
}

/* ==================== 视频展示区 ==================== */
.video-section {
    padding: 80px 0;
    background: #0a1e5c;
}

.section-title-light {
    text-align: center;
    font-size: 28px;
    font-weight: 600;
    color: white;
    margin-bottom: 50px;
}

.video-content {
    text-align: center;
}

.video-player {
    width: 100%;
    max-width: 900px;
    border-radius: 12px;
    background: #000;
}

.video-bg-img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
}

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
    .feature-detail-wrapper {
        flex-direction: column;
    }

    .feature-tabs {
        width: 100%;
        flex-direction: row;
    }

    .feature-tab {
        flex: 1;
        text-align: center;
        border-left: none;
        border-bottom: 3px solid transparent;
        padding: 16px 12px;
    }

    .feature-tab.active {
        border-left-color: transparent;
        border-bottom-color: var(--primary);
    }
}

@media (max-width: 768px) {
    .feature-detail {
        padding: 50px 0;
    }

    .feature-detail .section-title {
        font-size: 22px;
        margin-bottom: 30px;
    }

    .feature-tab {
        font-size: 13px;
        padding: 12px 8px;
    }

    .feature-panel {
        padding: 24px 16px;
    }

    .feature-panel-header h3 {
        font-size: 20px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .stat-num {
        font-size: 36px;
    }

    .video-section {
        padding: 50px 0;
    }

    .section-title-light {
        font-size: 22px;
        margin-bottom: 30px;
    }
}