body {
    background: linear-gradient(135deg, #f5f9fc 0%, #eef2f7 100%);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
}
.help-center {
    min-width: 1200px;
    margin: 120px auto;
    display: flex;
    gap: 30px;
    position: relative;
}

/* 左侧导航样式 */
.help-nav {
    flex: 0 0 260px;
    background: white;
    border-radius: 12px;
    padding: 20px 0;
    box-shadow: var(--shadow);
    height: fit-content;
    position: sticky;
    top: 30px;
}

    .help-nav h2 {
        padding: 0 20px 15px;
        margin-bottom: 15px;
        border-bottom: 1px solid var(--border);
        color: var(--secondary);
        font-weight: 600;
        display: flex;
        align-items: center;
        gap: 12px;
    }

        .help-nav h2 svg {
            width: 24px;
            height: 24px;
            fill: var(--accent);
        }

.nav-items {
    display: flex;
    flex-direction: column;
}

.nav-item {
    padding: 14px 30px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    color: var(--text);
    position: relative;
    font-weight: 500;
}

    .nav-item svg {
        width: 20px;
        height: 20px;
        fill: currentColor;
        transition: var(--transition);
    }

    .nav-item:hover {
        background: rgba(52, 152, 219, 0.08);
        color: var(--primary);
    }

    .nav-item.active {
        background: rgba(52, 152, 219, 0.15);
        color: var(--primary);
        font-weight: 600;
    }

        .nav-item.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            height: 100%;
            width: 4px;
            background: var(--primary);
            border-radius: 0 4px 4px 0;
        }

/* 右侧内容区域样式 */
.help-content {
    flex: 1;
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    min-height: 80vh;
}

.section-header {
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

    .section-header h1 {
        color: var(--secondary);
        font-size: 28px;
        margin-bottom: 10px;
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .section-header svg {
        width: 32px;
        height: 32px;
        fill: var(--primary);
    }

    .section-header p {
        color: var(--text-light);
        font-size: 16px;
        padding-left: 44px;
    }

.section-content {
    max-width: 800px;
}

.content-card {
    background: var(--light);
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 25px;
    transition: var(--transition);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

    .content-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 16px rgba(0,0,0,0.12);
    }

    .content-card h3 {
        color: var(--primary);
        margin-bottom: 15px;
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 20px;
        padding-bottom: 10px;
        border-bottom: 1px dashed var(--border);
    }

    .content-card svg {
        width: 24px;
        height: 24px;
        fill: currentColor;
    }

    .content-card p {
        margin-bottom: 15px;
        color: var(--text);
        line-height: 1.8;
    }

    .content-card ul {
        padding-left: 25px;
        margin: 15px 0;
    }

    .content-card li {
        margin-bottom: 10px;
        line-height: 1.6;
        position: relative;
    }

        .content-card li::before {
            content: '';
            position: absolute;
            left: -18px;
            top: 10px;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--accent);
        }

/* 客服区域样式 */
.support-area {
    background: linear-gradient(135deg, #f8f9fa 0%, #eef2f7 100%);
    border-radius: 12px;
    padding: 25px;
    border: 1px solid var(--border);
    margin-top: 40px;
}

    .support-area h3 {
        color: var(--accent);
        margin-bottom: 15px;
        font-size: 22px;
        display: flex;
        align-items: center;
        gap: 10px;
    }

.support-options {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.support-option {
    flex: 1;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border);
    text-align: center;
}

    .support-option:hover {
        transform: translateY(-5px);
        border-color: var(--accent);
    }

    .support-option h4 {
        display: flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 15px;
        color: var(--secondary);
        justify-content: center;
    }

    .support-option p {
        color: var(--text-light);
        margin-bottom: 15px;
        font-size: 14px;
    }

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: var(--primary);
    color: white;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 15px;
    text-align: center;
}

    .btn:hover {
        background: #2980b9;
        transform: translateY(-2px);
    }

.btn-accent {
    background: var(--accent);
}

    .btn-accent:hover {
        background: #e67e22;
    }